|Fujio TSUMORI||Last modified date：2018.04.16|
Associate Professor / Manufacturing Process / Department of Mechanical Engineering / Faculty of Engineering
|Fujio TSUMORI||Last modified date：2018.04.16|
|1.||Kengo JINNO, Fujio TSUMORI, Kentaro KUDO, Shinagawa Kazunari, Room temperature impact deposition of ceramic by laser shock wave, The 30th International Microprocesses and Nanotechnology Conference, 2017.11.|
|2.||Kazuhiro YUNEKURA, Fujio TSUMORI, Kazuki TOKUMARU, Kentaro KUDO, Shinagawa Kazunari, Study on control of interfacial pattern of imprinted multi-layered material, The 30th International Microprocesses and Nanotechnology Conference, 2017.11.|
|3.||Kazuki TOKUMARU, Simon HUNT, Fujio TSUMORI, Kentaro KUDO, Shinagawa Kazunari, Development of ceramic three-dimensional micro channel by combined process of laser processing and imprinting, The 30th International Microprocesses and Nanotechnology Conference, 2017.11.|
|4.||Shota NAKASHIMA, Fujio TSUMORI, Kazuki TOKUMARU, Kentaro KUDO, Shinagawa Kazunari, Development of process to build micro channels with the root structure of the plant, The 30th International Microprocesses and Nanotechnology Conference, 2017.11.|
|5.||Hayato SHINODA, Fujio TSUMORI, Kazuki TOKUMARU, Kentaro KUDO, Shinagawa Kazunari, Development of energy harvesting system using deformation of magnetic elastomer, The 30th International Microprocesses and Nanotechnology Conference, 2017.11.|
|6.||Ryuma MARUME, Fujio TSUMORI, Kentaro KUDO, Shinagawa Kazunari, Magnetically actuated artificial cilium with similar 3D-movement of natural cilium, The 30th International Microprocesses and Nanotechnology Conference, 2017.11.|
|7.||Seiji AZUKIZAWA, Fujio TSUMORI, Hayato SHINODA, Kazuki TOKUMARU, Kentaro KUDO, Shinagawa Kazunari, Development of printing system for magnetically anisotropic actuator
, Micro TAS 2017, 2017.10, We propose a new three-dimensional (3D) printing system for magnetic elastomer, which is composed of photo curable resin dispersed with magnetic particles. The obtained structure is magnetic and flexible so that they can work as an actuator by changing the applied magnetic field. During the curing process, a magnetic field is applied to set magnetic anisotropy at the curing portion, and we can design the motion of the actuator using this anisotropy. It means that we can not only print the 3D-structure but also print the deformation of printed actuator..
|8.||Kazuki TOKUMARU, Fujio TSUMORI, Shinagawa Kazunari, Fabrication of Wavy-Electrolyte for SOFC by Micro Imprint Process, 13th International Conference & Exhibition on Ceramic Interconnect & Ceramic Microsystems Technologies, 2017.04, Solid oxide fuel cells (SOFC) are fuel cells made of ceramics. SOFC have the highest efficiency among various kinds of fuel cells. They are mainly used for relatively large scale power source such as power plants. SOFC is expected to be a new main generator; however, energy density is not high and downsizing is also required to be more popular. To enhance the energy density of SOFC, we developed a SOFC with wave-electrolyte layer. As a wavy electrolyte has larger reacting area than a flat-electrolyte, higher energy density could be obtained. We propose a new method to form a wavy electrolyte layer in this work. The aim of our study is to develop a processing method of the thin and wavy YSZ electrolyte for SOFC. Our proposed process is named micro powder imprint (µPI) with multi-layer imprint process that is useful to fabricate micro scale pattern on a ceramic sheet such as an electrolyte layer of SOFC. The µPI is inspired by nano imprint lithography (NIL). NIL is a process to transcribe a nano-pattern on a resin film using a mold, and has been proposed by S. Y. Chou. The process can produce a fine pattern on the surface in high resolution, and is mass-productive. NIL is a process for polymer as a work material, while µPI is a process for inorganic materials. The starting material for µPI is a compound sheet containing material ceramic powder and binder consisting of thermoplastic resin. Fine pattern can be transcribed on a compound sheet by pressing with a mold as similarly with NIL. After imprinting, the resin in the compound is decomposed by heating, and inorganic powder is bonded together during the following sintering step. Authors already have reported fabrication of electrolyte sheet which has micro pattern on one side of the sheet by µPI In this study, we propose a method to form not only an electrolyte sheet but also an anode layers at a one time. Two different sheets were stacked into one sheet as a multi-layer sheet for the µPI process to form a wave-type compound sheet. We could control interface pattern between electrolyte and anode layers by changing mechanical property of each starting compound material. Next the formed layered sheet was sintered subsequently. Generally, it is not easy to sinter two kinds of materials at same time, because different shrinkage rate causes distortion. In this work, we tried several conditions to obtain sound sintered samples. As a result, the SOFC unit cell with wavy-electrolyte was fabricated without any cracking and bending. It is noted that the anode layer was formed at the same time. After adding the cathode layer, we succeeded to prepare a complete cell for testing power generating. The area of interfaces between anode and electrolyte was increased to over 120 % from flat electrolyte. This means a reaction surface area increased and higher efficiency would be expected. By using unit cells with wavy-electrolyte developed by our study, improvement of power generation efficiency of SOFC by simple processing can be expected．.|
|9.||Kazuki Tokumaru, Fujio TSUMORI, Kentaro Kudo, Toshiko Osada, Shinagawa Kazunari, Development of multi-layer imprint process for solid oxide fuel cell, 29th International Microprocesses and Nanotechnology Conference, 2016.11.|
|10.||Ryuma Marume, Fujio TSUMORI, Kentaro Kudo, Toshiko Osada, Shinagawa Kazunari, Development of magnetic-driven artificial cilia with high aspect ratio, 29th International Microprocesses and Nanotechnology Conference, 2016.11.|
|11.||Toshiko Osada, Ryuichi Hashikawa, Kentaro Kudo, Fujio TSUMORI, Hideshi Miura, Control The Deformation Of MIM Parts By The Powder Size Distribution, 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. As smaller the particle size of mixed powder, tap density of powder were decreased. However, sintered density and shrinkage were increased. Although high powder loading increased the viscosity during the injection molding, decreased the shrinkage of sintered compact. From these results, smaller deformation of the large and complex shaped parts could be realized by using mixed powder with smaller particle and higher powder loading..|
|12.||Fujio TSUMORI, Ryuma MARUME, Akinori SAIJOU, Development of artificial cilia actuated by applied magnetic field, The 8th KAIST - Kyushu University Joint Workshop, 2016.09.|
|13.||Hidenori Kawanishi, Fujio TSUMORI, 工藤 健太郎, Toshiko Osada, Hideshi Miura, Development of 3D Printing System for Magnetic Elastomer with Control of Magnetic Anisotropy in the Structure, 28th International Micro Processes and Nanotechnology Conference, 2015.11.|
|14.||Ryuma Marume, Fujio TSUMORI, Akinori Saijou, 工藤 健太郎, Toshiko Osada, Hideshi Miura, Metachronal Wave of Artificial Cilia Array Actuated by Applied Magnetic Field, 28th International Micro Processes and Nanotechnology Conference, 2015.11.|
|15.||Naoto Yoshigai, 工藤 健太郎, Toshiko Osada, Fujio TSUMORI, Hideshi Miura, Anisotropic Mechanical Properties of Ni-base Superalloy Compacts by Direct Laser Forming Technology, 3rd International Conference on Powder Metallurgy in Asia, 2015.11.|
|16.||Ryuichi Hashikawa, Toshiko Osada, 工藤 健太郎, Fujio TSUMORI, Hideshi Miura, Control of the Distortion of Large and Complex Shaped Parts by Metal Injection Molding Process, 3rd International Conference on Powder Metallurgy in Asia, 2015.11.|
|17.||工藤 健太郎, Sek Kin Wai, Toshiko Osada, Fujio TSUMORI, Hideshi Miura, Improvement of Mechanical Properties of Injection Molded Ni-base Superalloy Compacts, 3rd International Conference on Powder Metallurgy in Asia, 2015.11.|
|18.||Toshiko Osada, Yusuke Kanda, 工藤 健太郎, Fujio TSUMORI, Hideshi Miura, High Temperature Mechanical Properties of TiAl Alloy Parts Fabricated by Metal Injection Molding, 3rd International Conference on Powder Metallurgy in Asia, 2015.11.|
|19.||Choe Jungho, Toshiko Osada, 工藤 健太郎, Fujio TSUMORI, Hideshi Miura, Effect of Minor Boron Addition on the Fatigue Strength and High Temperature Properties of Injection Molded Ti-6Al-4V Compacts, 3rd International Conference on Powder Metallurgy in Asia, 2015.11.|
|20.||H. Ishimitsu, Toshiko Osada, 工藤 健太郎, Fujio TSUMORI, Hideshi Miura, Static and Dynamic Fracture Characteristics of the MIM Ti-6Al-4V Alloy Compacts Using Fine Powder, 3rd International Conference on Powder Metallurgy in Asia, 2015.11.|
|21.||Kazuki Tokumaru, Fujio TSUMORI, 工藤 健太郎, Toshiko Osada, Hideshi Miura, Development of corrugated ceramic sheet for SOFC electrolyte by micro imprint process, 3rd International Conference on Powder Metallurgy in Asia, 2015.11, 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 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. We can use various inorganic materials as powder materials. 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. Next, the compound sheet was stacked on a silicone rubber sheet and was imprinted by a fine-patterned mold. The silicone rubber was so flexible that micropatterns on the both sides of the compound sheet was obtained after imprinting. For the further improvement of the manufacturing method for a wave-type YSZ electrolyte, higher mold precision, and the process parameters such as temperature and pressure control, are important factors. In the present work, we used laser machining for mold manufacturing, and the process condition of µPI and the heat program of debinding and sintering were also optimized. As a result, a wave-type sintered YSZ sheet without significant defects was successfully obtained..|
|22.||Simon Hunt, Fujio TSUMORI, 工藤 健太郎, Toshiko Osada, Hideshi Miura, Wavy micro channels in micropatterned ceramic sheet formed by combined process of laser beam machining and imprinting, 3rd International Conference on Powder Metallurgy in Asia, 2015.11, Microchannels composed of polymers are commonly used in devices such as MEMS and μTAS (micro total analysis system). In this research, the polymers have been replaced by ceramics, which can endure a much harsher environment. The ceramic micro channels can be used in mechanical parts operated in extreme heat and in the presence of highly reactant chemicals.
In this work, the microchannels were fabricated by a combined process, which consists of micro powder imprinting and laser beam machining. A sheet composed of ceramic particles and polymers was prepared. A sacrificial layer, which was laser beam machined into the shape of the microchannels, was placed in between two ceramic compound sheets. A mould was placed on the upper surface then the imprinting process was carried out. By using a deep mould and replacing the sacrificial layer with a material that has larger elongation strength, the microchannels can be shaped into wavy channels which are along the imprinted wavy surface. After heating, the polymers decompose and the ceramic compact was sintered; ceramic micro channels with surface patterns are obtained.
As our microchannel forming process enables surface patterning and fabrication of out-of-plane micro channels, the surface area is increased, which enables applications as high efficiency heat exchangers. Moreover, by using yttria stabilized zirconia as structure material, which is used as electron exchanging membranes in solid oxide fuel cells, application on high efficiency fuel cells can be achieved.
|23.||Choe Jungho, Toshiko Osada, 工藤 健太郎, Fujio TSUMORI, Hideshi Miura, Improvement of fatigue strength for titanium alloy compacts by mim, 2015 International conference on powder metallurgy & particulate materials, 2015.05, Ti-6Al-4V alloy is paid the attention from the automotive and aerospace industries because of its outstanding specific strength and corrosion resistance. On the other hand, Ti-6Al-4V alloy has normally poor workability. Therefore, Metal Injection Molding (MIM) process is hoped to be one of the technique to reduce the manufacturing cost. Recently many researches for Ti-6Al-4V compacts by MIM process were reported, however, there are a few reports about fatigue fracture properties. According to our previous study, they presented a problem of low fatigue strength compared to wrought material. In this study, to improve the fatigue strength of Ti-6Al-4V compacts by MIM process, a little amount of boron was added by using TiB2 powder. Boron showed the effect of refining the grain size of lamellar structure of Ti-6Al-4V compacts, which lead to increase the fatigue strength..|
|24.||Lijan SHEN, Fujio TSUMORI, 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.|
|25.||Simon HUNT, Fujio TSUMORI, XU YANG, Toshiko Osada, Hideshi Miura, Surface Patterned Ceramic Sheet with Micro Channels by Combined Process of Laser Beam Machining and Imprinting, 27th International Microprocesses and Nanotechnology Conference, 2014.11.|
|26.||Akinori SAIJOU, Fujio TSUMORI, XU YANG, Toshiko Osada, Hideshi Miura, Development of Actuation System for Artificial Cilia with Magnetic Elastomer, 27th International Microprocesses and Nanotechnology Conference, 2014.11.|
|27.||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, 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 (SOFC). The authors focused on imprinting and powder metallurgy processes, and have developed the combined process, which has been named micro powder imprinting (μPI) 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 SOFC..|
|28.||Effect of Form Rolling on the Improvement of Tooth Root Bending Fatigue Strength for Sintered SCM415 Gears.|
|29.||Yuto NAGAMACHI, Yasuhiro YAMAMOTO, Fujio TSUMORI, Comparison of the experimental and FEM simulation results for the manufacture of a valve body, 11th international conference on Hot Isostatic Pressing, 2014.06.|
|30.||XU YANG, Fujio TSUMORI, Toshiko Osada, W.S.W. Harun, Hideshi Miura, 3D Modeling of Heterogeneous Microstructure for Super High Strengthened Low Alloy Steels by MIM Process, 2014 World Congress on Powder Metallurgy & Particulate Materials, 2014.05, In this study, a numerical 3D modeling using FEM for typically heterogeneous Microstructure for super high strengthened low Fe-Ni alloy steel, which was obtained by metal injection molding (MIM) process, is investigated. The designing of geometry models and material properties are introduced according to the experimental data. Moreover, the predicted stress-strain curve and distribution of each model are discussed..|
|31.||Fujio TSUMORI, Takuma Abe, Syuhei Seki, Koichi Nagasawa, Actuation of magnetic particles on array of magnetic elements, 26th International Microprocesses and Nanotechnology Conference, 2013.11.|
|32.||Yuki Tanaka, Fujio TSUMORI, XU YANG, Toshiko Osada, Hideshi Miura, Development of improved SOFC electrolyte sheet by micro imprinting proess for layered material, 26th International Microprocesses and Nanotechnology Conference, 2013.11.|
|33.||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, 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.
|34.||Wan Sharuzi Wan Harun, Toshiko Osada, XU YANG, Fujio TSUMORI, Hideshi Miura, FINE HETEROGENEOUS MICROSTRUCTURE AND MECHANICAL PROPERTIES OF MIM FE-NI ALLOY STEELS, PowderMet2013, 2013.06, The microstructure and mechanical properties of high performance sintered Fe-Ni alloy steels by using metal injection molding (MIM) process were investigated. The mixed elemental materials, iron and wateratomized Ni powders, were utilized in this study. The microstructure of the compacts have been consistently structured heterogeneously by molding and sintering the mixed elemental powders as same as our previous reports. In this study, the microstructural aspects of the compact were changed by the characteristics of Ni powder, such as particle size, shape, and distribution, which play important roles in the deformation behavior. Eventually, tempered compacts added 6 mass% fine Ni powder showed ultrahigh strength of more than 2 GPa (290 ksi) and elongation of higher than 8 %. In order to understand how the microstructure results these high mechanical properties, we developed 2D finite element modeling based on the spatial distribution obtained experimentally. The simulated results of the models were compared to experimentally obtained behavior, and showed good agreements..|
|35.||XU YANG, TSUMORI Fujio, HASHIMOTO Seiya, TAKAHASHI Masashi, KANG HYUNGOO, Osada Toshiko, Miura Hideshi, Improvement of Solid Oxide Fuel Cell by Imprinted Patterns on Electrolyte, IEEE-NEMS2013, 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..|
|36.||TSUMORI Fujio, HATAMA Kenji, KANG HYUNGOO, Osada Toshiko, Miura Hideshi, Magneto-FEM analysis for Micro Actuator using Array of Magnetic Elements, IEEE-NEMS2013, 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..|