Kyushu University Academic Staff Educational and Research Activities Database
List of Papers
Fujio TSUMORI Last modified date:2018.07.11

Associate Professor / Manufacturing Process / Department of Mechanical Engineering / Faculty of Engineering


Papers
1. Seiji Azukizawa, Hayato Shinoda, Kazuki Tokumaru, and Fujio Tsumori, 3D Printing System of Magnetic Anisotropy for Artificial Cilia, Journal of Photopolymer Science and Technology, 31, 1, 139-144, 2018.06.
2. Atsushi Sekiguchi, Yoko Matsumoto, Hiroko Minami, Tomoki Nishino, Hiroshi Tanigawa, Kazuki Tokumaru and Fujio Tsumori, Study of the Antifouling Polymer Sheet which used Biomimetics Technique, Journal of Photopolymer Science and Technology, 31, 1, 121-128, 2018.06.
3. W. S.W. Harun, R. I.M. Asri, F. R.M. Romlay, S. Sharif, N. H.M. Jan, Fujio Tsumori, Surface characterisation and corrosion behaviour of oxide layer for SLMed-316L stainless steel, Journal of Alloys and Compounds, 10.1016/j.jallcom.2018.03.233, 748, 1044-1052, 2018.06, The stable oxide layer formed through thermal oxidation (TO) process on selective laser melted 316 L stainless steel (SLMed-316 L SS) substrate surface attested to assists in refining their corrosion resistance and observed to behave relatively inert in physiological conditions. The surface characterisation and corrosion behaviour of the oxidised SLMed-316 L SS are the primary focus of this study. The formation of the oxide layer on SLMed-316 L SS was investigated at constant ambient atmosphere and 700 °C temperature for three different soaking times (150, 200 and 250 h). The surface characterisation of the oxide layer was performed using Field Emission Scanning Electron Microscope (FESEM), Energy Dispersive X-ray Spectroscopy (EDX) and X-ray Diffraction (XRD) to correlate the thickness of oxide layer and surface morphology after the TO treatment. Whereas, the electrochemical analysis was conducted using potentiodynamic polarisation to investigate the corrosion behaviour of the oxide layer. The finding disclosed an increase in the oxide layer thickness formation at prolonged exposure in ambient atmosphere. Also, the TO at 150 h showed an improved corrosion behaviour due to the presence of Fe2O3 and Cr2O3 layers. However, the extended soaking time showed no improvement towards the corrosion behaviour..
4. Daiki Maede, Fujio Tsumori, Toshiko Osada, Kentaro Kudo, Visco-elastic control of elastomer with magnetic particles by applied magnetic field, IEEJ Transactions on Sensors and Micromachines, 10.1541/ieejsmas.138.48, 138, 2, 48-53, 2018.01, The purpose of this study was to explicate the mechanism of transition storage modulus and loss modulus under external magnetic field. Magneto-rheological elastomer (MRE) is expected to be used as damping material and actuator controlled by an external magnetic field. However, magnetic particles' behavior inside of MRE has not been explained completely. Especially, the mechanisms of loss modulus transition under external magnetic field has not been known well. We constructed a simple model with two magnetic particles, and try to make MRE behavior clear. In this report, we show a data of the viscoelastic property of MRE which consists of magnetic particles and polydimethylsiloxane (PDMS). The obtained viscoelastic property is explained by using two magnetic particles model..
5. Kazuki TOKUMARU, Fujio TSUMORI, Kentaro KUDO, Toshiko Osada, K. Shinagawa, Development of multilayer imprint process for solid oxide fuel cells, Japanese Journal of Applied Physics, 10.7567/JJAP.56.06GL04, 56, 06GL04, 2017.06, Solid oxide fuel cells (SOFCs) are fuel cells made of ceramics. To increase the SOFC energy density, we developed an SOFC with a wavy electrolyte layer. As a wavy electrolyte has a larger reaction surface area than a flat electrolyte, a higher energy density could be obtained. Our proposed process is named micro-powder imprint (µPI) with a multilayer imprint process that is useful for fabricating a microscale pattern on a ceramic sheet such as an SOFC electrolyte layer. µPI is based on nanoimprint lithography; therefore, it also exhibits the same advantages of high resolution and mass productivity. The starting material for µPI is a compound sheet containing ceramic powder and binder materials consisting of thermoplastic resin. In this study, two different sheets were stacked into one sheet as a multilayer sheet for the µPI process to form a wavy compound sheet. As the initial state of the stacked sheet, including the mechanical properties of each layer, affects the final wavy shape, we changed the material composition. As a result, the SOFCs unit cell with a wavy electrolyte was fabricated. Note that the anode layer was formed at the same time. After adding the cathode layer, we succeeded in preparing a complete cell for testing power generation..
6. Ryuma MARUME, Fujio TSUMORI, Kentaro KUDO, Toshiko Osada, K. Shinagawa, Development of magnetic-field-driven artificial cilium array with magnetic orientation in each cilium, Japanese Journal of Applied Physics, 10.7567/JJAP.56.06GN15, 56, 06GN15, 2017.05, Artificial cilia actuated by an applied magnetic field have been developed. In our previous report, we demonstrated actuated cilia of a few millimeters scale, which were fabricated by cutting a magnetic elastomer sheet. The fabricated artificial cilia worked similarly to natural cilia;
however, they had a much larger structure than natural ones, and showed difficulty for use in pumping systems in micro-total analysis systems
(µTAS) fields. Thus, our goal is further miniaturization. In this study, we introduce a new process of fabricating smaller pillar structures with a
magnetic orientation in each pillar by ultraviolet (UV) laser machining. We also give different orientations to groups of pillars by the alternate laser machining of the mold and casting processes..
7. Toshiko Osada, Kentaro Kudo, Ryuichi Hashikawa, Fujio TSUMORI, Hideshi Miura, Control the Deformation of MIM Parts by the Powder Size Distribution, Proc. World PM2016, 2016.10, Metal Injection Molding (MIM) process is suitable for fabricating small parts in large quantity. In this work, relatively large and complex shaped parts were prepared thorough MIM. In order to decrease the deformation of sintered parts, powders of different sizes were mixed. The effect of powder particle distribution and powder loading on the distortion of complex shaped compacts were investigated and evaluated. Smaller deformation of the large and complex shaped parts could be realized by using mixed powder with smaller particle..
8. Fujio TSUMORI, Kazuki Tokumaru, Kentaro Kudo, Toshiko Osada, Hideshi Miura, Development of Corrugated Ceramic Sheet for SOFC Electrolyte by Micro Imprint Process, Journal of the Japan Society of Powder and Powder Metallurgy, 10.2497/jjspm.63.519, 63, 7, 519-523, 2016.07, Yttria-stabilized zirconia (YSZ) has been used for an electrolyte of solid oxide fuel cells (SOFC). To enhance the efficiency of SOFC, we developed a corrugated, or wavy-shaped, YSZ sheet for the electrolyte. As the corrugated sheet has larger surface area than a flat-type sheet, higher energy density can be obtained. We have proposed micro powder imprint (μPI) with multi-layer imprint process to fabricate micro scale pattern on the both surfaces of a thin YSZ sheet. The μPI is a combined process of nano imprint lithography and powder metallurgy; the resolution is high, and the process is mass-productive. In this work, we selected a compound material containing YSZ powder and a binder consisting of thermoplastic resin as a starting material. The compound sheet was prepared by tape casting from slurry and was imprinted by a fine-patterned mold with stacked on a silicone rubber sheet. The silicone rubber was so flexible that micro patterns on the both sides of the compound sheet was obtained after imprint. In the present work, the process condition of μPI and the heat program of debinding and sintering were also considered. As a result, a wave-type sintered YSZ sheet without significant defects was successfully obtained..
9. Fujio TSUMORI, Simon Hunt, Kentaro Kudo, Toshiko Osada, Hideshi Miura, Wavy Micro Channels in Micropatterned Ceramic Sheet Formed by Combined Process of Laser Beam Machining and Imprinting, Journal of the Japan Society of Powder and Powder Metallurgy, 10.2497/jjspm.63.511, 63, 7, 511-518, 2016.07, Micro channels made of polymers are commonly used for MEMS and μTAS (micro-total analysis system) devices. In this research, we developed a process for fabricating a ceramic sheet with micro channels. The developed process is based on powder metallurgy process. A compound material, a mixture of ceramic powder and polymer, was prepared as sheet material. We employed laser machining to machine the sacrificial layer to form micro channels inside the sheet. We also employed imprinting, which is a process of pressing with a mould while heating, to form a structure with surface patterns and micro channels curving along with it. After the imprinted sheet was debound and sintered by heating, a ceramic sheet with micro-surface patterns and micro channels was obtained. As ceramics have high heat durability and low chemical reactivity, ceramic micro channels can be used for flow sensors or chemical reaction testers operated in harsh environments, such as high temperature or mechanical parts operated with reactive chemicals. In addition, by imprinting wavy patterns, the surface area can be increased. Therefore high efficiency heat exchangers can be built. Moreover, this method can be applied on SOFCs (solid oxide fuel cell) by fabricating YSZ (yttria stabilized zirconia) micro channels..
10. Ryuichiro Hashikawa, Toshiko Osada, Kentaro Kudo, Fujio TSUMORI, Hideshi Miura, Control the Distortion of the Large and Complex Shaped Parts by the Metal Injection Molding Process, Journal of the Japan Society of Powder and Powder Metallurgy, 10.2497/jjspm.63.473, 63, 7, 473-478, 2016.07, Metal Injection Molding (MIM) is an effective way to manufacture small components with low cost and high precision. However, in the case of large components, it becomes difficult to control the distortion and cracking because of the big shrinkage during debinding and sintering process. Therefore it is important to optimize the condition of each process to reduce the distortion of MIM compacts. Moreover, powder size is also one of the most important parameters. The small particle powder shows high shrinkage and high density as compared to large particle powder during sintering process. In this study, blending of both powders was conducted and the influence of powder size distribution on the distortion of complex shaped parts was evaluated. A coordinate measuring machine, which is a 3D device for measuring the physical geometrical characteristics of an object, was used to measure the distortion. Finally, through controlling the distribution of particle size, distortion of the comparatively large and complex shaped MIM compacts was successfully restrained..
11. Kentaro Kudo, Sek Kin Wai, Toshiko Osada, Fujio TSUMORI, Hideshi Miura, Improvement of Mechanical Properties of Injection Molded Ni-base Superalloy Compacts, Journal of the Japan Society of Powder and Powder Metallurgy, 10.2497/jjspm.63.462, 63, 7, 462-467, 2016.07, Superalloy has been used for aerospace application because of their excellent attributes of high strength and corrosion resistance at high temperature. Inconel 718 is one of the representative Ni-based superalloy. Generally, superalloy has poor workability, especially high tool wear by machining, so that it is not easy to produce the components of complex shaped parts at low cost. To overcome such as the problem, metal injection molding (MIM) process would be a useful technique which offers net shape production, high design flexibility, and high cost efficiency for mass production. In this study, gas-atomized fine alloy powder of Inconel 718 was prepared for MIM process, and the mechanical properties of injection molded compacts were investigated. The relative density over 99.7 %, which is much higher than density of usual MIM compacts, was obtained by supersolidious liquid-phase sintering. Furthermore, injection molded Inconel 718 showed high fatigue strength comparable to the wrought materials, because the pore size of the MIM compacts was smaller than the inclusion size of wrought materials. And it was found that the grain size was more dominant than pore size against the fatigue failure of MIM Inconel 718 with near full density..
12. Toshiko Osada, Yusuke Kanda, Kentaro Kudo, Fujio TSUMORI, Hideshi Miura, High Temperature Mechanical Properties of TiAl Intermetallic Alloy Parts Fabricated by Metal Injection Molding, Journal of the Japan Society of Powder and Powder Metallurgy, 10.2497/jjspm.63.457, 63, 7, 457-461, 2016.07, It is not easy to fabricate the complicate shaped titanium aluminide (Ti-Al) components by conventional methods such as machining or forging, and casting leads to inhomogeneous microstructures. Metal injection molding (MIM) has the potential to be a cost-efficient process and near net shape technique, especially for the complex shaped mass-produced components. In this study, Ti-Al intermetallic alloy compacts were fabricated through MIM technique. Sound compacts with over 95 % of relative density and without any warpage or defects were obtained thorough MIM process. Different microstructures of duplex, near lamellar, and full lamellar were obtained by changing the sintering temperature. Their tensile strength at room and high temperature is 85 to 90 % of that of wrought material. Tensile strength of MIM compact would be expected the same level with cast materials by optimization of sintering conditions, densification by HIP treatment and so on..
13. Jungho CHOE, Toshiko Osada, Kentaro Kudo, Fujio TSUMORI, Hideshi Miura, Effect of Minor Boron Addition on the Fatigue Strength and High Temperature Properties of Injection Molded Ti-6Al-4V Compacts, Journal of the Japan Society of Powder and Powder Metallurgy, 10.2497/jjspm.63.451, 63, 7, 451-456, 2016.07, Ti-6Al-4V alloy has attracted a lot of attention from the automotive and aerospace industries because of their outstanding specific strength and corrosion resistance. On the other hand, Ti-6Al-4V alloy has normally poor workability because of the low thermal conductivity and the low elastic modulus. Metal injection molding (MIM) process is expected to manufacture a complex part with near net shape and reduce the manufacturing cost. However, Ti-6Al-4V alloy compacts by MIM process had a problem of low fatigue strength compared to wrought material.In this study, we tried to add a minor amount of boron using TiB2 powder for improving the fatigue strength. Addition of boron resulted refinement of the grain size of lamellar structure, which lead to increase the high cycle fatigue strength and fatigue limit. In addition, tensile properties at high temperature was investigated..
14. Kentaro Kudo, Hiroyoshi Ishimitsu, Toshiko Osada, Fujio TSUMORI, Hideshi Miura, Static and Dynamic Fracture Characteristics of the MIM Ti-6Al-4V Alloy Compacts Using Fine Powder, Journal of the Japan Society of Powder and Powder Metallurgy, 10.2497/jjspm.63.445, 63, 7, 445-450, 2016.07, Titanium alloys show not only the excellent mechanical properties but also good biocompatibility. However, they show normally poor machinability, which become the disadvantage of high processing cost. Metal injection molding (MIM) process is one of the techniques to improve that drawback. Because MIM process can produce the three dimensional complex shaped parts at low cost. Ti-6Al-4V is a typical titanium alloy and the MIM compacts show high static strength as same as wrought materials. However, their fatigue strength is a little low level as compared to wrought materials. To improve the mechanical properties of Ti-6Al-4V alloy compacts, it is important to refine the grain size and increase the relative density. In this study, the effects of the particle size of the powders on the mechanical properties were investigated. The use of a fine powder improved the mechanical properties because of their high density. Moreover, the crystal grain growth was restrained as compared to the case of the same relative density using larger powder..
15. Naoto Yoshigai, Kentaro Kudo, Toshiko Osada, Fujio TSUMORI, Hideshi Miura, Anisotropic Mechanical Properties of Ni-base Superalloy Compacts by Direct Laser Forming Technology, Journal of the Japan Society of Powder and Powder Metallurgy, 10.2497/jjspm.63.427, 63, 7, 427-433, 2016.07, As Ni-based superalloy has poor workability, direct laser forming (DLF) would be a powerful tool for fabricating the complex shaped Ni-based superalloy parts. We focused on the microstructure of the parts produced by DLF, the crystal grains of which grow along the building direction. This anisotropic microstructure is one of the major features of the parts produced by DLF, and which may cause anisotropic mechanical properties.In this work, the optimum laser-forming conditions such as laser power, laser scan speed, and powder feeding rate were determined by evaluating the density of the produced parts. Three types of tensile test pieces and two types of fatigue test pieces were fabricated in different building direction. They had higher ultimate tensile strength than that of JIS standards in wrought materials. However, their elongation was lower than that of JIS standards, and also the dispersion of elongation was large. On the other hand, fatigue limit was a little lower than the standard value. It was confirmed that the mechanical properties of Ni-based superalloy parts produced by DLF were different by a difference in building direction.
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16. Fujio TSUMORI, Hidenori Kawanishi, Kentaro Kudo, Toshiko Osada, Hideshi Miura, Development of three-dimensional printing system for magnetic elastomer with control of magnetic anisotropy in the structure, Japanese Journal of Applied Physics, http://dx.doi.org/10.7567/JJAP.55.06GP18, 55-6S1, 06GP18, 2016.06, In this paper, we report on a new system of three-dimensional (3D) printing for a magnetic elastomer that contains magnetic particles. Not only can we fabricate a three-dimensional structure, but we can also control the magnetically anisotropic property o.
17. Fujio TSUMORI, Ryuma Marume, Akinori Saijou, Kentaro Kudo, Toshiko Osada, Hideshi Miura, Metachronal wave of artificial cilia array actuated by applied magnetic field, Japanese Journal of Applied Physics, http://dx.doi.org/10.7567/JJAP.55.06GP19, 55, 06GP19, 2016.05, In this paper, a biomimetic microstructure related to cilia, which are effective fluidic and conveying systems in nature, is described. Authors have already reported that a magnetic elastomer pillar actuated by a rotating magnetic field can work like a na.
18. Fujio TSUMORI, Akinori SAIJOU, Toshiko Osada, Hideshi Miura, Development of actuation system for artificial cilia with magnetic elastomer, Japanese Journal of Applied Physics, 10.7567/JJAP.54.06FP12, 54, 6S1, 06FP12-1-06FP12-5, 2015.05, In this paper, we describe the development of magnetically actuated artificial cilia. Natural cilia are a highly efficient device that produces flow under a small-Reynolds-number state. There are two important characteristics of natural cilia; one is asymmetric movement, which is composed of effective and recovery strokes, and the other is the phase difference of a stroke in each cilium in an array that will produce a metachronal wave. In this paper, we propose an actuation system for artificial cilia composed of a silicone elastomer and multiparticle chains of a magnetic material. The applied magnetic field is controlled by rotation of a permanent magnet. This rotating magnetic field induced an asymmetric movement similar to that of a natural cilium. We also changed the orientation angle of multiparticle chains to control the phase difference of a stroke in each artificial cilium. This technique would help to realize metachronal waves of artificial cilia..
19. Fujio TSUMORI, Simon Hunt, Toshiko Osada, Hideshi Miura, Formation of ceramic micro-channel by combination of laser beam machining and micro powder imprinting, Japan Society of Applied Physics, 10.7567/JJAP.54.06FM03, 54, 6S1, 06FM03-1-06FM03-5, 2015.05, Microchannels made of polymers are commonly used for MEMS and micro-total analysis system (µTAS) devices. If a micro-channel structure can be constructed of a more stable material, the analysis of more reactant chemicals in harsher environments can be realized. In this research, we developed a process for fabricating a ceramic sheet with micro-channels. The developed process is based on powder metallurgy process. A compound material, a mixture of ceramic powder and polymer, was prepared as the sheet material. We employed laser machining to machine the sacrificial layer to form micro-channels inside the sheet. We also employed imprinting to form a structure with surface patterns and microchannels curving along with it. After the imprinted sheet was debound and sintered by heating, a ceramic sheet with micro-surface patterns and microchannels was obtained..
20. Fujio TSUMORI, Lijan Shen, Toshiko Osada, Hideshi Miura, Hierarchical patterning by multi-step micro-imprinting with layered materials, Manufacturing Review, 10.1051/mfreview/2015008, 2, 2015.05, The objective of the work reported in this paper is to create multi-scale and hierarchical surface structures using a simple imprinting process. The hierarchical structures can be fabricated with only simple patterned molds by proposed multi-step imprinting process, instead of using a high cost hierarchical-patterned mold. In the proposed process, the starting material is a layered sheet material. The layered sheet is pressed by a mold with a finer pattern, and subsequently pressed by a mold with a rougher pattern. A pure polymer sheet is employed as the upper layer, which will be removed during heating processes as a sacrificed layer, while the lower layer is a compound material of polymer and ceramic powder. After heating process, ceramic compact is sintered and formed a full-dense patterned sheet. By the proposed multi-step imprinting process with a layered material, ceramic sheets with micro hierarchical pattern can be fabricated with low cost. In the present work, poly(vinyl alcohol) (PVA) was prepared as the upper layer, and a compound material of alumina powder and PVA as a lower layer. Molds with finer and rougher patterns were also prepared for multi-step imprinting. As a result, a hierarchical structure on a thin ceramic sheet could be fabricated..
21. Deformation Control of Large Sized MIM Parts by Changing the Powder Size Distribution.
22. Lijan SHEN, Fujio TSUMORI, XU YANG, Toshiko Osada, Hideshi Miura, Hierarchical patterning by multi-step micro imprinting process for layered material, 7th Asia Workshop on Micro/Nano Forming Technology, 2014.11, The objective of this paper is to create multi-scale and hierarchical surface structures using simple imprinting technique. The hierarchical structures are found in the natural world; for example, lotus leaves, which are famous for high hydrophobic surface. A multi-step imprinting process was developed in this work to fabricate such kind of bio-mimetic surface structure. The hierarchical structures can be fabricated with only simple patterned molds. Another characteristic of the proposed process is that the starting material is a layered sheet material. The layered sheet was pressed by a mold with a finer pattern, and subsequently pressed by a mold with a rougher pattern. Both fine and rough patterns were obtained on the interface between the upper and lower layers after these multi-step imprinting. A polymer sheet was employed as the upper layer, which will be removed during heating processes. After removing the upper layer, hierarchical surface structure is left on the surface. In the present work, poly(vinyl alcohol) (PVA) was prepared as a upper layer, and a compound material of alumina powder and PVA as a lower layer. The PVA can be easily removed by heating. Molds with finer and rougher patterns were also prepared for multi-step imprinting. As a result, a hierarchical structure on a thin ceramic sheet was fabricated..
23. Fujio TSUMORI, XU YANG, Yuki TANAKA, Toshiko Osada, Hideshi Miura, Micrometer-scale Imprinting Process for Ceramic Sheet from Powder Compound Material, 11th International Conference on Technology of Plasticity, ICTP 2014, 10.1016/j.proeng.2014.10.169, 81, 1433-1438, 2014.10, A micro patterning process for thin ceramic sheets is proposed and developed in this paper. Thin sheets with a micro pattern have been expected to improve performance of solid oxide fuel cell. The authors focused on imprinting and powder metallurgy processes, and have developed the combined process, which has been named micro powder imprinting process. In this process, ceramic powder and polymer binder materials are mixed with pure water by milling machine. After drying out the water from the slurry, a thin compound sheet was obtained. Subsequently, the sheet was pressed using a fine patterned mold with heating to transcribe a micro pattern on the sheet. Finally, the imprinted sheet was heated for removing the polymer binder and for sintering. As further improvement of the process, a compound sheet was stacked on a pure polymer sheet during the imprint process to transcribe a micro pattern on the both sides of the sintered sample. The technique is useful for improved solid oxide fuel cell..
24. Yuto NAGAMACHI, Yasuhiro YAMAMOTO, Fujio TSUMORI, Comparison of Experimental and FEM Simulation Results for Manufacturing a Valve Body, Proc. 11th International Conference of Hot Isostatic Pressing, 71-78, 2014.06, In the field of the industrial use of the PM-HIP process, it is a common understanding that dimensional accuracy and shape are critical factors as well as the material yield. Thus, the precise prediction of shrinkage during HIP treatment is becoming more important as product sizes have become larger in recent years. For this reason, computer simulation technology has been utilized by many engineers in the PM-HIP field. In this study, a quarter-sized model of an actual valve made of Stainless Steel 316L for offshore drilling rigs or cooling water lines of a PWR (pressurized water reactor) is manufactured and tested along with the FEM simulation of the shrinkage phenomenon. Both results are compared, especially applying stress on the dimensional accuracy using HIP. Three dimensional measurement by a laser scanning system is used for the experiment because the conventional two dimensional methods have not been necessarily satisfactory depending on the shape of the object. By the use of this measurement technique, a significant improvement in the accuracy is achieved. Details of the experimental data are discussed..
25. Micro Patterning on the Sheets of Ceramic Material by a Combined Process of Laser Machining and Powder Metallurgy.
26. Fujio TSUMORI, Yuki TANAKA, XU YANG, Toshiko Osada, Hideshi Miura, Development of improved solid oxide fuel cell electrolyte sheet by microimprinting for layered material, Japanese Journal of Applied Physics, doi:10.7567/JJAP.53.06JK02, 53, 06JK02-1-06JK02-6, 2014.05, At present, the solid oxide fuel cell (SOFC) is attracting much attention because it possesses the highest power generation efficiency among many types of fuel cell, and SOFC emits only water that does not harm the environment. Recently, the electrolyte structure for SOFC has been processed into various forms to increase the efficiency of SOFC. In this work, we tried to improve the performance of SOFC by changing the mesostructure on the interfaces between the electrolyte and electrodes. This hundred-micrometer-scaled mesostructure has been proposed to increase the reaction on the interfaces. However, there has been no effective method of fabricating the cells with the microstructure along the interfaces. We have already proposed the micro powder imprint (µPI) method to create fine patterns on ceramic samples. In this study, the µPI method for layered material was newly developed to fabricate the micropatterns on both sides of an electrolyte sheet. The optimization of process parameters, such as compounding ratio, debinding temperature, and sintering temperature, was examined to obtain desired wavy patterns on both surfaces of the electrolyte sheet..
27. XU YANG, Fujio TSUMORI, Toshiko Osada, Hideshi Miura, Improvement of solid oxide fuel cell by imprinted micropatterns on electrolyte, Micro & Nano Letters, 10.1049/mnl.2013.0310, 8, 10, 571-574, 2013.10, A study is presented of an improved interfacial structure between the electrode and electrolyte of a solid oxide fuel cell. An imprint process,
which is considered as a powerful tool to transcribe nano to micropatterns on materials, was employed to imprint fine patterns onto a ceramic
sheet of electrolyte. In the presented work, a sheet of ceramic compound material was prepared, and micropatterns were imprinted on its
surface. After debinding and sintering, a dense ceramic sheet with fine micropatterns was obtained. To investigate the effect of
micropatterns on the overall performance of a fuel cell, three kinds of electrolyte sheets with different surface patterns were employed for
this technique. After applying anode and cathode layers, the three fuel cell samples were assembled to test the cell performance. The
result was that the finer pattern caused better performance in the three samples by exhibiting the highest overall voltage and power
density, and the effective factors of patterns on ion conductivity were discussed as well. Based on the investigation, some further
improved three-dimensional microstructures were proposed and fabricated by the method of micro powder imprinting (μPI)..
28. Fujio TSUMORI, XU YANG, HYUNGOO KANG, Toshiko Osada, Hideshi Miura, SIMULATION OF DEFORMATION OF LAYERED SHEET DURING MICRO POWDER IMPRINTING PROCESS, XII International Conference on Computational Plasticity, 1267-1273, 2013.09, This paper reports simulation of deformation during micro powder imprinting process, which is a newly developed process to form micro patterned surface on ceramic sheets. The process is proposed as a combined process of traditional hot-embossing and powder metallurgy. A compound sheet of powder material and polymer binder is pressed by a mold to be transcribed a micro-pattern on its surface. After pressing, the binder is removed by heating, and the sheet is sintered. Finally dense ceramic sheet with fine pattern can be obtained. This process can be used also for layered sheet of two different materials. By using this layered sheet, we can make a pattern not only on the surface of the upper layer but also along the interface between each layer. Of course, the same pattern with the mold’s shape can be transcribed on the surface, while, there can be found another micro pattern along the interface. These two patterns of the surface and the interface are useful to fabricate ceramic sheet with patterns on its both surfaces. For example, if a compound sheet was used as an upper layer and a pure organic sheet as a lower, the lower organic layer can act as a sacrificed layer. After debinding and sintering, only the upper layer remains, which has micro-patterns on the both sides. The shape of interface between layers can be controlled by changing properties of layers. It could be also influenced by the imprinting conditions, such as temperature and pressure. In order to design the shape of the interface, finite element analysis was employed in the present paper. Mooney-Rivlin’s deformation model was used to express deformation of materials during imprinting. In this paper, we compared the simulated results with experimental data to show effectiveness of the present simulation method..
29. XU YANG, TSUMORI Fujio, HASHIMOTO Seiya, TAKAHASHI Masashi, KANG HYUNGOO, Osada Toshiko, Miura Hideshi, Improvement of Solid Oxide Fuel Cell by Imprinted Patterns on Eelectrolyte, IEEE-NEMS2013, 887-890, 2013.04, This paper reports an improved interfacial structure between electrode and electrolyte of Solid Oxide Fuel Cell (SOFC). We employed an imprint process to give fine patterns onto a ceramic electrolyte sheet. The imprint process is a powerful tool to transcribe nano- to micro-patterns on materials. In the present work, a sheet of ceramic compound material was prepared, and micro patterns were given on the sheet. After debinding and sintering, dense ceramic sheet with fine patterns were obtained. We prepared three kinds of electrolyte sheets with different surface patterns using this technique. After applying anode and cathode layers, the three fuel cell samples were assembled to test the cell performance. It was resulted that the finer pattern caused the best performance in the three samples..
30. TSUMORI Fujio, HATAMA Kenji, KANG HYUNGOO, Osada Toshiko, Miura Hideshi, Magneto-FEM Analysis for Micro Actuator using Array of Magnetic Elements, IEEE-NEMS2013, 845-848, 2013.04, This paper reports a magnetic actuator using interaction between micro magnetic elements. It was already reported that the present actuator can work even if the structure was miniaturized to nano-scale. In the present work, simple fabrication process with photolithography and PDMS casting was employed to obtain beam type structures with micro array of magnetic elements on their surface. Two samples with simple grid patterns were prepared for testing. These samples had the same grid pattern but different orientation, which caused directly opposite bending deformation under the same applied magnetic field. We used magneto finite element method (FEM) to explain the behavior of the present actuators..
31. T. Tokuoka, T. Yamamoto, K. Kudo, F. Tsumori, T. Nishioka, H. Miura, Effect of Heterogeneous Microstructure on Mechanical Properties of Sintered Ni Alloy Steels, Proceedings of the 2012 Powder Metalluryg World Congress & Exhibition, 17A-T9-15, 2013.02.
32. T. Hazama, T. Tokuoka, H. Kang, T. Osada, F. Tsumori, H. Miura, Effect of Mezzo-heterogeneous Microstructure on Mechanical Properties of Fe-Ni Sintered Alloy Steels, Proceedings of the 2012 Powder Metalluryg World Congress & Exhibition, 17A-T9-14, 2013.02.
33. F. Tsumori, H. Kang, T. Osada, H. Miura, Particle Packing Simulation using Vibration Method, Proceedings of the 2012 Powder Metalluryg World Congress & Exhibition, P-T8-81, 2013.02.
34. F. Tsumori, S. Hashimoto, M. Takahashi, Y. Xu, H. Kang, T. Osada, H. Miura, Micro Imprinting Process for Surface Patterning of Ceramic Sheet, Proceedings of the 2012 Powder Metalluryg World Congress & Exhibition, P-T6-72, 2013.02.
35. S. Morinaka, T. Osada, H. G. Kang, F. Tsumori, H. Miura, Mechanical Properties of Rene95 Superalloy Compacts by Metal Injection Molding, Proceedings of the 2012 Powder Metalluryg World Congress & Exhibition, P-T5-61, 2013.02.
36. S. Virdhian, T. Osada, H. G. Kang, F. Tsumori, H. Miura, Distortion of Large and Complex Shaped Ti and Ti-6Al-4V Alloy Compacts by Metal Injection Molding Process, Proceedings of the 2012 Powder Metalluryg World Congress & Exhibition, 16B-T5-23, 2013.02.
37. W. S. W. Harun, T. Osada, H. G. Kang, F. Tsumori, H. Miura, Evaluation of Heterogeneous Microstructure for Ultrahigh Strengthening MIM Sintered Low Alloy Steels, Proceedings of the 2012 Powder Metalluryg World Congress & Exhibition, 16B-T5-21, 2013.02.
38. Takahisa NOMOTO, HYUNGOO KANG, Toshiko Osada, Fujio TSUMORI, Hideshi Miura, K. Kato, Formation of Bronze Porous Layer on the Ferrous Substrate by Laser Forming, Proceedings of the 2012 Powder Metallurgy World Congress & Exhibition, 18F-T4-8, 2013.02.
39. H. G. Kang, K. Yamada, T. Osada, F. Tsumori, H. Miura, Mechanical Properties of Direct Metal Laser Formed Ti Alloy Parts, Proceedings of the 2012 Powder Metallurgy World Congress & Exhibition, 18F-T4-7, 2013.02.
40. Wan Sharuzi WAN HARUN, Toshiko OSADA, Hyungoo KANG, Fujio TSUMORI, Hideshi MIURA, Investigation of Fine Heterogeneous Microstructure on the Mechanical Properties of MIM Fe-Ni Alloy Steels, J. Jpn. Soc. Powder Powder Metallurgy, 59, 12, 677-684, 2012.12.
41. S. Virdhian, T. Osada, H. G. Kang, F. Tsumori, H. Miura, Evaluation and Analysis of Distortion of Complex Shaped Ti-6Al-4V Compacts by Metal Injection Molding Process, Key Engineering Materials, doi:10.4028/www.scientific.net/KEM.520.187, 520, 187-194, 2012.09, Titanium and its alloys have been widely used for medical and aerospace applications
because of their excellent attributes of high specific strength, corrosion resistance, and
biocompatibility. However, it is not easy to produce the complex shaped parts due to their poor
castability and machinability. Metal injection molding (MIM) is one of suitable processing
technique to produce the complex shaped parts in order to reduce the manufacturing cost. In this
study, complex shaped Ti-6Al-4V compacts was prepared by MIM process for airplane application.
The effects of high molecular binder content and different compact’s set-up during thermal
debinding on the distortion of complex shaped compacts were measured and evaluated. The binder
with 10 % APP (Atactic polypropylene) was found to have better shape retention for the parts.
Furthermore the results indicate that high distortion occurs at early stage of thermal debinding
process. The use of supports during thermal debinding can significantly reduce the distortion of the
final parts..
42. Kenji Hatama, Fujio Tsumori, Yang Xu, Hyungoo Kang, Toshiko Osada, Hideshi Miura, Magnetic Micro Actuator Using Interactive Force between Magnetic Elements, Japanese Journal of Applied Physics, 51, 06FL14-1-4, 2012.07, In micro electro mechanical system (MEMS) field, there have been used many kinds of actuators. Among them, the magnetic actuator has some
advantages. As magnetic micro actuators do not need electric wiring for energy supply, the structure can be simple and be downsized easily.
However, the magnetic force would be very small with downsizing, which is the main problem for conventional magnetic actuators. We propose a
new type actuator using magnetic interaction force between magnetic elements to solve this matter. This actuator can work even if it gets smaller,
because the interaction force is dominant in a microscopic region. We fabricated the actuator by a casting process with photolithography using the
SU-8 resist material. Then, the structure was fabricated by casting the mixture of poly(dimethylsiloxane) (PDMS) and a magnetic powder material.
The beam type actuator works successfully and also shows interesting behavior. We can control the behavior of this actuator by changing the
arrangement of magnetic elements on the structure. We also show theoretical evaluation of the deformation of the present actuator..
43. Yang Xu, Fujio Tsumori, Hyun Goo Kang, Hideshi Miura, Study on Fabrication of Micrometer Patterned Ceramic Sheet with Micro Powder Imprinting (μPI) Method , Advanced Science Letters, 10.1166/asl.2012.2774, 12, 170-173, 2012.06, The ceramic thin sheet with micrometer scale 3D patterns may be used widely in the field of Micro Electro Mechanical Systems and we improved a new method of micro powder imprinting to fabricate the thin sheet with the powder of zirconia nanometer scale powder. The micrometer scale line and space patterns from 5 μm to 1 mm were imprinted on ceramic sheets at the binder's glassy state temperature with three kinds of mold in order to remove the mold from 400 μm ceramic sheets. In debinding and sintering steps, effects of parameters such as heating and cooling ratio, temperature of sintering on the final sample's mechanical properties such as the flatness of sheet, porosity and hardness will be investigated and discussed. Finally, we employed the 300 μm thick ceramic sheets with micro patterns fabricated by the μPI method for the electrolyte for solid oxide fuel cell. .
44. Evaluation and Analysis of Distortion during MIM Process of Titanium Alloy Materials - 2nd Report -.
45. Wan Sharuzi Wan Harun, Kinji Toda, Toshiko Osada, Hyungoo Kang, Fujio Tsumori, Hideshi Miura, Effect of MIM Processing Parameters on the Properties of 440C Stainless Steel, 粉体および粉末冶金, 59, 5, 264-271, 2012.05.
46. Effect of Mezzo-Heterogeneous Microstructure and Rolling on the Rolling Contact Fatigue Strength of Sintered High Ni Alloy Steels.
47. Improvement of Surface Densification and Fatigue Strength by Tooth Root Rolling of Sintered Ferrous Alloy Gear Added Mo.
48. Fatigue Failure Properties of Injection Molded Superalloy Compacts.
49. Yang Xu, Fujio Tsumori, Hung-Goo Kang, Hideshi Miura, Fabricatino of Micro Patterned Ceramic Structure by Imprinting Process, Journal of the Japan Society of Powder and Powder Metallurgy, 58, 11, 673-678, 2011.11.
50. Fabrication of Porous Structured WC-Co Alloy Compacts by Indirect Laser Forming.
51. Fabrication of Super-Elastic Ti-10V-2Fe-3Al Alloy Compacts by MIM Process.
52. Fatigue Properties of Ti Alloy Compacts by Metal Injection Molding - Part 1.
53. Effect of Mezzo-Heterogeneous Microstructure and Rolling on the Tooth Root Bending Fatigue Properties of Sintered Ni Alloy Steel Gears.
54. Yang Xu, Fujio Tsumori, Takuya Toyooka, Hidetoshi Kotera and Hideshi Miura , Effects of Resist Thickness and Viscoelasticity on the Cavity Filling Capability in Bilayer Thermal Embossing, Japan Journal of Applied Physics, 10.1143/JJAP.50.06GK11 , 50, 06GK11, 2011.06.
55. Development of High Precision and Strength Sintered Ferrous Alloy Gear by Rolling - 3nd Report -
Improvement of Tooth Root Bending Fatigue Strength of Sintered Ferrous Alloy Gear by Modified Tool
.
56. Improvement of the Contact Fatigue Strength by Rolling of Sintered Ferrous Alloy Rolle - 2nd Report-.
57. Effect of Powder Type on the Polling Contact Fatigue Strength of 4600 Sintered Alloy Steels.
58. Hideshi MIURA, Kenta OKAWACHI, Hyun Goo KANG, Fujio TSUMORI, Kosaku KURATA and Nobuhiro ARIMOTO, Laser Forming of Ti-6Al-7Nb Alloy Powder Compacts for Medical Devices, Materials Science Forum, 654-656, 2057-2060, 2010.06.
59. The Control Method of Porous Structure for density Gradient Materials in Direct Metal Laser Sintering (DMLS).
60. Naoki Miyano, Yuuki Inoue, Yuji Teramura, Fujio Tsumori, Hiroo Iwata and Hidetoshi Kotera, Gene transfer device utilizing micron-spiked electrodes produced by the self-organization phenomenon of Fe-alloy, Lab on a Chip, Vol. 8, pp. 1104-1109, 2008.01.
61. Fujio Tsumori, Micro Fabrication Process of Powder Compact with Semi-solid Mold, Materials Science Forum, Vol. 534-536, pp. 473-476., 2007.01.
62. Fujio Tsumori, Hiroyuki Ogawa and Susumu Shima, On-demand Droplet Spotter for Formation of Micropattern Using Electrostatic Force, Advances in Powder Metallurgy and Particulate Materials, Vol.2, pp. 96-107, 2005.01.
63. Fujio Tsumori and Susumu Shima, Isostatic Powder Compaction Process with Bingham Semi-solid/fluid Mold Material, Advances in Powder Metallurgy and Particulate Materials, Vol.1, pp. 157-169, 2005.01.
64. Hidetoshi Kotera, Fujio Tsumori, Ikkou Iritani, Tomoharu Watanabe and Susumu Shima, Improving NdFeB Magnet Fabrication: In-Situ Observation of Powder Flow, International Journal of Powder Metallurgy, Vol. 40-1, pp33-40, 2004.01.
65. Fujio Tsumori, Masamichi Hirata and Susumu Shima, Column Structure Growth Simulation of Magnetic Particles by Distinct Element Method Coupled with Magneto-FEM, Advances in Powder Metallurgy and Particulate Materials, Vol.1, pp. 74-84, 2005.01.
66. Fujio Tsumori, Hideki Kume, Atsushi Kakitsuji, Hiroki Miyamoto and Susumu Shima, Semi-solid Mold Isostatic Compaction, International Journal of Powder Metallurgy, Vol.39-8, pp46-51, 2003.01.
67. Tatsuhiko Aizawa, Yunan Prawoto, Fujio Tsumori, Coupled, macro-micro modeling for hot deformation and sintering, Journal of Computational and Applied Mathematics, Vol. 149-1, pp307-324, 2002.01.
68. Fujio Tsumori and Tatsuhiko Aizawa, Macro-micro Modeling for Coupled Elasto-creep and Thermal Analyses under Sintering, Materials Science and Engineering A, Vol 285, pp357-362, 2000.06.
69. Tatsuhiko Aizawa and Fujio Tsumori, Coupled-Multilevel Modeling for Hot Deformation and Sintering, Key Engineering Materials, Vol 177-180, pp661-666, 2000.01.