Kyushu University Academic Staff Educational and Research Activities Database
List of Presentations
Saito Noritaka Last modified date:2024.06.03

Associate Professor / Physical Chemistry for Metallurgy / Department of Materials Science and Engineering / Faculty of Engineering


Presentations
1. Makoto OGAWA, So SEGAWA, Prima SEJATI, Yosephus PRAYITNO, Masahiro TAKEI, and Noritaka SAITO
, “Visualization of Molten Slag Suspension by Electrical Resistance Tomography”
, TMS2024, TMS Annual Meeting & Exhibition, Symposium on Advanced Real Time Imaging, 2024.03.
2. Alief A. LUTHFIE, So SEGAWA, Yosephus A. K. PRAYITNO, Noritaka SAITO, and Masahiro TAKEI
, “Spatiotemporal Distribution Imaging of Solid Fraction During Molten Salt Crystallization Process by 3D High Temperature Electrical Resistance Tomography (3D-htERT)”, ISMTMF 2023, 12th International Symposium on Measurement Techniques for Multiphase Flows, 2023.11.
3. So SEGAWA, Masato OGAWA, Yosephus A. K. PRAYITNO, Alief A. LUTHFIE, Noritaka SAITO, and Masahiro TAKEI, “Two Parameters Evaluation of High-temperature Electrical Resistance Tomography (htERT) Applied to Molten Oxide”
, ISMTMF 2023, 12th International Symposium on Measurement Techniques for Multiphase Flows, 2023.11.
4. Noritaka SAITO, “Some Electrical Properties of Molten Slags Characterized under Various AC Electric Fields”, 3rd ISIJ-VDEh-Jernkontoret-Symposium, 2023.10.
5. Won Yeong SON, Tomoko SUGIMURA, Sei KIMURA, Noritaka SAITO, and Kunihiko NAKASHIMA
, “Effect of FenO and CaO/SiO2 on the Viscosity of EAF-type Slags”
, ECTP2023, 22st European Conference on Thermophysical Properties, 2023.09.
6. Noritaka SAITO, Kenta AYA, Takehiro SUMITA, and Kunihiko NAKASHIMA
, “Electrical Conductivity of CaO-Al2O3-CaF2 Melts”
, ECTP2023, 22st European Conference on Thermophysical Properties, 2023.09.
7. Noritaka SAITO and Kunihiko NAKASHIMA, “Various Properties of Molten Slag Extracted under AC Electric Field”, The Fourteenth Korea-Japan Workshop on Science and Technology in Ironmaking and Steelmaking, 2023.07.
8. So SEGAWA, Yosephus A K PRAYITNO, Prima SEJATI, Miku ARISATO, Noritaka SAITO, and Masahiro TAKEI, “Detection of Solid-liquid Phase Changes of LiCl-KCl Binary Mixture by Electrical Impedance Spectroscopy with Platinum-wire Electrode (pw-EIS)”, ICMF2023, The 11th International Conference on Multiphase Flow, 2023.04.
9. So SEGAWA, Miku ARISATO, Kento NAKANISHI, Prima SEJATI, Yosephus PRAYITNO, Kunihiko NAKASHIMA, Noritaka SAITO, and Masahiro TAKEI, “Visualization of Molten Slag Suspension by Electrical Impedance Tomography”, TMS2023, TMS Annual Meeting & Exhibition, Symposium on Advanced Real Time Imaging, 2023.03.
10. Kento NAKANISHI, Noritaka SAITO, and Kunihiko NAKASHIMA, “Viscoelasticity Evaluation of Multiphase Suspensions with High Solid Fraction by Oscillating Concentric Cylinder Method”, International Workshop on Advanced Experimental Mechanics for Students and Young Researchers 2022, 2022.11.
11. Kento NAKANISHI, Noritaka SAITO, and Kunihiko NAKASHIMA, “Viscoelasticity Evaluation of Suspensions with High Solid Fraction by Oscillating Concentric Cylinder Method”, SynOre2022, The 1st International Symposium on Iron Ore Agglomerates, 2022.11.
12. Kento NAKANISHI, Noritaka SAITO, and Kunihiko NAKASHIMA, “Viscosity Measurement of Liquid-Vapor Coexisting Molten Oxide”, ATPC 2022, The 13th Asian Thermophysical Properties Conference, 2022.09.
13. Kento NAKANISHI, Noritaka SAITO, and Kunihiko NAKASHIMA, “Viscoelasticity Evaluation of Suspensions with High Solid Fraction by Oscillating Concentric Cylinder Method”, ATPC 2022, The 13th Asian Thermophysical Properties Conference, 2022.09.
14. Noritaka SAITO, Yoshiyuki EGASHIRA, and Kunihiko NAKASHIMA, “Rheological Behavior of Simulated Foaming Slag Generated by Interfacial Reaction”, ICS 2022, 8th International Congress on the Science and Technology of Steelmaking, 2022.08.
15. Tomoki FURUKAWA,Noritaka SAITO, and Kunihiko NAKASHIMA, “Evaluation of Interfacial Energy between Molten Fe-18%Cr-9%Ni Alloy and Non-Metallic Inclusion-Type Oxides at 1873K”, TMS2022, TMS Annual Meeting & Exhibition, Symposium on Advanced Real Time Imaging, 2022.03.
16. In the steelmaking process, the viscosity of molten slag is one of the most important parameters for understanding and optimizing refining operations and processes because it directly and significantly affects the flow behavior of the melt with slag as the matrix and the slag-metal reaction rate. It is also well known that the apparent viscosity of molten slag is very sensitive not only to temperature and chemical composition, but also to the presence of secondary or dispersed phases such as solids, gases and other liquids. Furthermore, the apparent viscosity of melts with these multiphase slag matrices is also affected by the mass transfer coefficient1), diffusion constant2), and other related parameters through which various simulations have been conducted to understand, control, and improve the steelmaking process. Therefore, there are many reported cases of viscosity of molten slag and it has been archived for more than half a century3) , but most of them have been measured in the temperature range higher than the liquid phase temperature where the slag becomes a homogeneous liquid. In addition, most of the estimation models for viscosity of molten slag proposed in the steelmaking process field, such as Urbain4), Riboud5), Iida6), and Nakamoto7) , assume uniformly molten slag. However, at actual operating temperatures in steelmaking processes such as hot metal processing, BOF, EAF, LF, and continuous casting, most slag and flux are not homogeneous melts, but rather contain excessively added CaO and its reaction products such as 3CaO⋅P2O5, 2CaO⋅SiO2, CaS, and partially crystallized mold flux that has been undercooled. P2O5, 2CaO⋅SiO2, CaS, etc., and solids such as cuspidine contained in partially crystallized mold flux after undercooling are often present. The apparent viscosity of slag and flux containing these dispersed solids is higher than that of the homogeneous melt, which can be an operational hazard.
 Attempts have been made to investigate the effect of the dispersed solid phase on the apparent viscosity of slag. For example, Wright et al. investigated the effect of spinel (MgAl2O4) particles of different sizes on the viscosity of CaO-MgO-Al2O3-SiO2 slag at 1646 K and reported that the addition of spinel particles increased the apparent viscosity. Wu et al. measured the apparent viscosity of paraffin suspensions with a silicone oil matrix at room temperature and further measured the apparent viscosity of CaO-Al2O3-SiO2-MgO slag at high temperatures. The effect of 2CaO⋅SiO2and MgO particles on the viscosity of CaO-Al2O3-SiO2-MgO slag was investigated, and it was reported that the suspension still behaved as a Newtonian fluid when the volume fraction of solid particles was 0.1 or less, but as a non-Newtonian fluid when the volume fraction was 0.15 or more9) .
 Similarly, some of the authors systematically investigated the apparent viscosity of polyethylene bead suspensions10,11) with silicone oil matrix at room temperature and CaO-SiO2-R2O (R=Li, Na, K) slag suspension12) at high temperatures, and found that the suspensions behaved as Bingham fluids when the volume fraction of solid phase was 30 vol% or more. The suspensions were found to behave as Bingham fluids when the volume fraction of the solid phase was greater than 30 vol%. These differences in the dispersed solid phase fraction that cause the suspension to change from a Newtonian to a non-Newtonian fluid may be attributed to the size, shape, and interaction of the suspension particles with the liquid phase matrix. Prior to these experimental studies, Einstein initiated theoretical studies on the apparent viscosity of dilute suspensions (about 2 vol% solids),13) and many subsequent studies have proposed theoretical and empirical equations for the apparent viscosity of suspensions.14-45) Liu et al. recently reported the apparent viscosity of molten Liu et al. recently reviewed these experimental and theoretical approaches to better understand the apparent viscosity of silicate suspensions and summarized the possibilities and suggestions for future research46,47) .
 Here, one of the issues to be clarified in previous studies on the apparent viscosity behavior of slag suspensions related to the steelmaking process is the interaction between the dispersed solid phase and the slag matrix. Molten slag and fluxes are composed of various ions, including complex anions of acidic oxides (SiO2, Al2O3, P2O5, B2O3, etc.) containing bridged and non-bridged oxygen, basic oxides and cations used for charge compensation, and free oxygen. The presence of these cations and anions is known to contribute to ionic, interfacial, and orientation polarization of the molten slag matrix, resulting in high dielectric constant and capacitance48) , and consequently, molten slag is presumed to be an extremely polar liquid. Solid particles dispersed in the molten slag matrix, such as 3CaO⋅P2O5, 2CaO⋅SiO2, CaS, and Cuspidine, are basically compounds of low electronegative cations and high electronegative chalcogens and halogens, which are also highly polar. Therefore, the solid particles dispersed in the molten slag matrix have strong interactions in the molten slag, similar to the interactions arising from the zeta potential of aqueous suspensions. These interactions lead to repulsion between the electric double layers on the surface of the dispersed solid phase, which may significantly affect the viscoelastic behavior and flow properties of the slag suspension. For example, an aqueous suspension of electrostatically stabilized SiO2 particles with low zeta potential exhibits low apparent viscosity and Newtonian fluid-like behavior, while an unstable SiO2 suspension with high zeta potential exhibits much higher apparent viscosity and clear shear thinning than the former49). However, to the best of the authors' knowledge, there have been few experimental studies on the effect of polar liquid matrix on the apparent viscosity of molten slag suspensions in the field of high-temperature metallurgy, including steelmaking processes.
 In this study, as a basis for evaluating the apparent viscosity of slag suspensions with polar liquid matrices, the apparent viscosity of suspensions consisting of spherical particles of polyethylene beads dispersed in a matrix of silicone oil or glycerol solution was measured at room temperature. The effects of volume fraction of beads, bead size, shear rate, and liquid-phase viscosity on apparent viscosity were systematically evaluated. Based on the experimental data obtained, an empirical equation based on the Einstein-Roscoe equation17) was proposed to accurately reproduce the apparent viscosity of the slag suspension. Furthermore, to investigate the applicability of the proposed model equation, the apparent viscosity of slag suspension with CaO or MgO particles dispersed in a CaO-Al2O3-SiO2-MgO slag matrix melted at 1773 K was evaluated. These results provide insight into the effect of liquid phase polarity on the apparent viscosity of molten slag with dispersed solid phase, which has not been considered before..
17. The electric furnace used to melt and solidify high-level radioactive waste forms glass melts by Joule heating with AC current. Therefore, the resulting glass melt's electrical conductivity is a fundamental and essential process control factor. In the present study, we established a method for measuring the electrical conductivity of glass melts independently of the cell constant using the van der Pauw method, a kind of four-terminal method. The electrical conductivity of SiO2-B2O3-Al2O3-Na2O-Li2O-CaO-ZnO melt was measured in the range of 1000~1400 ℃. It was found that the electrical conductivity increased with Al2O3 content. The electrical conductivity was found to increase with increasing Al2O3 content, while the effect of the SiO2/B2O3 ratio was found to be limited. This is attributed to the different impact of each network former component on the network anion structure of the glass melts. In addition, a significant increase in electrical conductivity was observed in the series with the addition of the simulated waste component.
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18. Noritaka SAITO, “Crystallization of Mold Flux characterized under AC Field”, CSST 2021, 2021 China Symposium on Sustainable Iron- and Steelmaking Technology, 2021.12, Oxides employed in steelmaking processes, such as mold flux, undergo a phase transition from a homogeneous molten state to a thermodynamically stable crystalline state after undercooling below the liquidus temperature. In the molten state, silicate-based oxides are composed of anions that have a network structure and cations that modify the network structure, making them a sea of ions, so to speak, with high electrical conductivity and relative permittivity. On the other hand, oxide crystals are generally insulators and are known to have a low relative permittivity. The author's research group has been attempting to use the difference in the AC electric field characteristics of these oxide melts and solids as a sensitive indicator of the emergence of solids from the melts, i.e., crystallization, for the past decade. In this presentation, I would like to outline the findings and discuss future prospects.
The response of a calcium silicate melt melted at 1873 K to a 10 kHz AC electric field was continuously monitored while the melt was cooled at a constant rate using concentric cylindrical platinum alloy electrodes. As a result, it was found that the electric capacitance value calculated from the imaginary part of the impedance decreased by two or three orders of magnitude at the crystallization temperature. Two-step crystallization behaviors such as primary crystallization and eutectic reaction, as well as accelerated crystallization of undercooled oxide melts by rotational stirring, were detected. In addition, a physical model to estimate the solidus ratio of the crystallized crystalline phase based on the capacitance model formulated from the electrode size and the relative permittivity model of the two-phase mixture was proposed, and it was confirmed that the model reproduced the experimental data very well. Furthermore, we have developed a prototype device that can simultaneously perform viscosity measurements using these new methods using AC electric fields and the crucible rotation method, which enable us to simultaneously evaluate the viscosity increase due to crystallization during the cooling process and the solidus fraction in the undercooled melt..
19. Yoshiyuki EGASHIRA, Noritaka SAITO, and Kunihiko NAKASHIMA, “Viscosity Evaluation of Simulated Foaming Slag Generated by Interfacial Reaction”, ASIA STEEL 2021,The 8th Asia Steel International Conference, 2021.12, In hot metal treatment, foaming slag is generated by the reaction of slag containing carbon and FexO in the hot metal, and in EAF, the carbonaceous material and slag to protect the furnace refractory. In addition, when the slag foams violently in the furnace, it induces the scattering of slag and molten steel. Therefore, it is safe to predict the behavior of the foaming slag in the furnace with high accuracy and control the process. It can be said that it is indispensable from the viewpoint of efficiency. Furthermore, in order to predict the flow of slag during tapping with high accuracy, it is necessary to evaluate the apparent viscosity of foaming slag, which controls mass transfer, with high accuracy. Therefore, in the present study, we systematically investigated the viscosity of foaming slag produced by reacting FexO-CaO-SiO2 slag with Fe-C alloy by the concentric rotating cylinder method.
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20. Eleven years have passed since the severe accident at the Fukushima Daiichi Nuclear Power Station (hereinafter referred to as "1F") of Tokyo Electric Power Holding Co. Eleven years have passed since the severe accident at the Fukushima Daiichi Nuclear Power Station (1F), and measures to remove fuel debris are now being considered in a manner consistent with the in-vessel damage status and debris distribution at each unit. The understanding of the in-vessel conditions and the refinement of accident scenarios are expected to serve as basic data for safe and as rapid decommissioning as possible. On the other hand, as the situation inside the accident reactor is gradually clarified through the progress of the 1F internal investigation and 1F sample analysis, it is becoming clear that the actual situation inside the 1F reactor is different from the "estimation from typical accident conditions" evaluated based on the analysis of the Three Mile accident in the United States, which was more than assumed in the past. The accident scenario analysis "Forward Analysis" using accident progression analysis codes, etc., which has been conducted in the past, has reached its limits in refining the understanding of such 1F-specific in-pile conditions. Therefore, there is a need for "Backward Analysis," which is based on field knowledge to identify critical accident events that have not been sufficiently studied in the past, to accurately understand and model the phenomena, and to acquire and verify more accurate and appropriate data through material experiments.
 In this study, as urgent issues in the current situation in the 1F reactor, we are investigating the Cs migration pathway during the accident to determine the cause of the high dose under the shield plugs in Units 1F Units 2 and 3, the state of Cs deposition and attachment to structural materials, and the characterization of metal-rich debris that is estimated to have melted down from the RPV to the PCV in Units 1F Units 2 and 3. Backward Analysis focusing on the characterization of metal-rich debris (evaluation of oxidation characteristics at the time of dissolution), which is presumed to have been dissolved from the RPV to the PCV in Units 1F2 and 3. In "Research Topic (1) Reducing the uncertainty of Cs distribution evaluation," the chemical environment and mass transport during the accident in the RPV and PCV were evaluated based on the results of MAAP analysis based on the most probable scenario of the accident progression in Units 2 and 3, and the changes in Cs chemical forms were preliminarily evaluated. In addition, thermal analysis tests were conducted in a steam atmosphere using Cs-containing samples, and the reaction tendency of Cs with steel and other materials was preliminarily investigated. In order to predict the influence of residual Cs in fuel debris on the flowability of oxide melts containing concrete components and their Cs release behavior during the MCCI process, we measured the viscosity of CeO2(-ZrO2)-CaO-Al2O3-SiO2 melts at high temperatures and also measured the viscosity of Cs2O-Fe2O3 aerosol formation phenomenon. These results indicate that even a small amount of residual Cs dramatically reduces the viscosity of oxide melts containing concrete components, but has only a very limited effect on accident propagation events because the Cs is immediately released due to increased flowability. Furthermore, the Cs2O-FeO system has high chemical affinity and melts easily, and depending on the in-core conditions, the reaction of residual Cs from the fuel debris with molten stainless steel may have generated a Cs-Fe-O aerosol, which was not previously expected and may have contributed to the high-dose conditions above the RPV. In "Research Topic (2) Evaluation of Oxidative Transformation of Metal Debris," the oxidative transformation of simulated metal debris was preliminarily evaluated by thermal analysis tests in a steam atmosphere. Preliminary experiments on molten Fe-Zr metal melts and ZrO2 equilibrium, which is the reaction basis of molten metal debris and oxide debris, were initiated, and the validity of the Zr activity measurement method necessary to determine the unoxidized Zr reaction contribution ratio in the metal melts, an important factor in clarifying the pressure vessel failure mechanism, was confirmed. Furthermore, we determined the conditions for measuring the viscosity of metal debris, which is indispensable for predicting the flow of solid-liquid coexisting metallic materials that will be discharged at the time of pressure vessel failure. Through these efforts, we established a method for extracting and measuring elemental parameters for analyzing the process of metallic debris remelting in the lower plenum and melting steel materials while being oxidized and transformed by water vapor, leading to the pressure vessel failure. In "Research Topic (3) Comprehensive Evaluation," the results of each research topic were comprehensively considered to identify events and scenarios to be studied intensively in this study. In order to reduce the uncertainty of Cs migration behavior in high dose situations, which has been an issue in the field, we focused on the Cs reaction in high temperature and steam depleted conditions and the migration to the top of the RPV focusing on the aerosol formation process during the release from the fuel debris, and on the Cs reaction and the aerosol formation process during the remelting of metallic debris. The pressure vessel failure event associated with the remelting of metallic debris is important to verify the elemental reactions in each of oxidation and transformation by water vapor (gas-liquid reaction) and steel melting (solid-liquid reaction), which are in a competitive relationship.
As described above, in FY2021, we will start the development of the necessary infrastructure and preliminary experiments to promote the experimental research and simulation study on each elemental technology method, as well as to develop a mutual understanding of the two issues of Backward Analysis extracted in this study through mutual collaboration with Forward Analysis specialists. In addition, we discussed the policy to improve the understanding of the phenomena and the in-core situation through mutual collaboration with Forward Analysis experts on the two issues of Backward Analysis identified in this study. As a result, we were able to share our understanding of the chemical state changes and migration pathways of fuel debris and Cs with reference to the most probable scenario of accident progression, and we made a prospect for future research development.
In addition, this study aims to utilize the cooperative relationship with St. Petersburg University in Russia, which is well known for thermodynamic evaluation of multi-systems including FP-derived oxides, to improve the evaluation for reducing uncertainty in estimating the in-core contamination status. In Russia, as part of nuclear safety research against the background of the 1F accident, the advancement of Cs evaporation transfer models and MCCI analysis methods for accident progression is being considered. Therefore, in order to expand the knowledge on the adsorption and re-evaporation of Cs once evaporated into ex-vessel debris, Cs2O -SrO-Al2O3-SiO2 system including Cs oxides and concrete components. On the Japanese side, in addition to the Cs physical property data at high temperatures among the data acquired at St. Petersburg University, the objective is to evaluate the effect of Sr on the FP contamination status in the reactor by utilizing the physical property data of Sr with moderate evaporability, which we do not directly conduct.
 In FY2021, we determined the test conditions to start with data acquisition for the Cs2O-Al2O3 and SrO-Al2O3 binary systems, which are the subsystems of the multi-system system we are targeting. Next, as preliminary experiments, two samples were prepared for the Cs2O-Al2O3 system and three samples for the SrO-Al2O3 system, and phase identification of the microstructures in the fabricated samples was conducted by powder XRD analysis.
 In addition, a literature survey was conducted on how to conduct high-temperature experiments (up to 2700 K) on Cs- and Sr-containing multinary systems for full-scale tests scheduled to begin in FY2022. The thermodynamic evaluation experiment at St. Petersburg University is based on high-temperature mass spectrometry using a Knudsen cell. The sample is held at elevated temperatures up to the target temperature, and the data from the ionization of the gas produced by the instrument is analyzed to determine the vapor pressure of the gassed compound. Therefore, it was reported that preliminary experiments determine the compound form that is generated and ionized when the target system is gasified.
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21. Foaming slag is formed by the reaction of carbon in the hot metal and slag containing FexO in hot metal processing, and by the reaction of charcoal and slag to protect the furnace body in EAF. In case of severe bubbling of slag in the furnace, it induces scattering of slag and molten steel from the furnace. Therefore, it is essential to accurately predict the behavior of foaming slag in the furnace and to control the process from the viewpoint of safety and efficiency. In addition, accurate measurement of the viscosity of the forming slag, which governs mass transfer, is necessary to accurately predict the flow of slag during tailings. In this study, the viscosity of foaming slag generated by the reaction of FexO-CaO-SiO2 slag and Fe-C alloy was systematically investigated by a rotation method..
22. Foaming slag is formed by the reaction of carbon in the hot metal and slag containing FexO in hot metal processing, and by the reaction of charcoal and slag to protect the furnace body in EAF. In case of severe bubbling of slag in the furnace, it induces scattering of slag and molten steel from the furnace. Therefore, it is essential to accurately predict the behavior of foaming slag in the furnace and to control the process from the viewpoint of safety and efficiency. In addition, accurate measurement of the viscosity of the forming slag, which governs mass transfer, is necessary to accurately predict the flow of slag during tailings. In this study, the viscosity of foaming slag generated by the reaction of FexO-CaO-SiO2 slag and Fe-C alloy was systematically investigated by a rotation method..
23. Al2O3, MgO, and MgAl2O4 are typical non-metallic inclusions. To remove these non-metallic inclusions, it is effective to promote collision and coalescence among the inclusions to make coarse inclusions that are favorable for flotation separation. In order to control and estimate the cohesive coalescence of inclusions, it is important to understand the wettability between inclusions and molten steel, such as interfacial energy and contact angle. However, in previous studies on high-temperature wettability, the experimental conditions such as temperature, atmosphere, and crystallographic orientation were different from each other, making it difficult to compare the values of interfacial energy and contact angle in a unified manner. In this study, the wettability of Al2O3, MgO, and MgAl2O4 non-metallic inclusion substrates to molten iron and molten Fe-18%Cr-9%Ni alloy were evaluated.
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24. During steel refining, the slag by-product is not a uniform melt, it contains solids like undissolved calcium oxide (CaO) or carbonaceous material and gases like Carbon monoxide (CO) generated by the interfacial reaction between hot metal and slag. Furthermore, the liquid entangled in the hot metal when forming slag creates a complex high-temperature fluid which has some closely-related problems. For example, significant amounts of molten iron loss from slag forming in the pre-treatment process of hot metal and also undissolved CaO due to the excessive refining agent added to ensure the quality of steel and high-density forming slag due to the excessive value of discharged slag. These problems are generated by processes in the second phase, in which the high-temperature slag matrix can’t be ascertained. Here, the viscosity of suspensions of CaO or MgO particles dispersed in a matrix of CaO-Al2O3-SiO2-MgO slag at 1773 K was measured. The trend of increasing viscosity of the molten slag suspensions with dispersed CaO or MgO particles was similar to that of the room-temperature suspensions, exhibiting Bingham non-Newtonian behavior. The viscosity model composed with the results from the glycerol aqueous suspensions underestimated the slag viscosity, which can be attributed to the repulsive forces in the high-polarity liquid matrix.
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25. Noritaka Saito, and Kunihiko NAKASHIMA, “Characterization of Secondary Phases Dispersed in Molten Slags utilizing Alternative Current Field”, MOLTEN2021,The 11th International Conference on Molten Slags, Fluxes and Salts, 2021.02.
26. Noritaka Saito, and Kunihiko NAKASHIM, “Simultaneous Evaluation of Viscous and Crystallization Behaviors of Silicate Melts by Capacitance and Viscosity Measurement”, Glass Meeting 2020, 2020.12.
27. Noritaka SAITO, and Kunihiko NAKASHIMA, “Simultaneous Evaluation of Viscosity and Crystallization Behavior of Silicate Melt by Electrical Capacitance Measurement”, ICG 2019, 25th International Congress on Glass, 2019.06.
28. Ziyao ZHANG, Noritaka SAITO, and Kunihiko NAKASHIMA, “Wettability of Graphite-CaO·2Al2O3 Composites against Molten CaO-SiO2-Al2O3-MgO slags”, 日本金属学会九州支部 日本鉄鋼協会九州支部 令和元年度共催合同学術講演会, 2019.06.
29. Ziyao ZHANG,Noritaka SAITO, and Kunihiko NAKASHIMA, “Wettability of Graphite-CaO·2Al2O3 Composites against Molten CaO-SiO2-Al2O3-MgO Slags”, TMS2019, 142nd Annual Meeting & Exhibition, 2019.03.
30. Noritaka SAITO, “Recent Activities of High Temperature Melt Group at Kyushu University”, Austro-Japanese Ironmaking Summit 2018, 2018.09.
31. Noritaka SAITO, and Kunihiko NAKASHIMA, “Wetting behavior of Graphite-Al2O3 Substrates against Molten CaO-SiO2-Al2O3-MgO Slags”, ICSTI2018, 8th International Congress on the Science and Technology of Ironmaking, 2018.09.
32. Noritaka SAITO, and Kunihiko NAKASHIMA, “Quantitative Evaluation of Solid or Gas Phase in Molten Slag Characterized under Alternative Current Field”, The 7th Australia-China-Japan Joint Symposium on Iron and Steelmaking, 2018.09.
33. Noritaka SAITO, Yusuke HARADA, and Kunihiko NAKASHIMA, “Properties related to Dual-phase Fluid of Molten Slags Characterized under Alternative Current Field”, ICS2018, 7th International Congress on the Science and Technology of Steelmaking 2018, 2018.06.
34. Noritaka SAITO, and Kunihiko NAKASHIMA, “Wettability of Graphite-Alumina Composites against Molten CaO-SiO2-Al2O3-MgO Slags”, TMS2018 141st Annual Meeting & Exhibition, 2018.03.
35. Noritaka SAITO, “Evaluation of Oxide Melt Crystallization Characterized by Capacitance Measurement”, lCMR2017, The Eighth International Conference on Materials Engineering for Resources, 2017.10.
36. Yusuke HARADA, Noritaka SAITO, and Kunihiko NAKASHIMA, “Rheological Behavior of Foaming Slag”, EMECR2017, 1st International Conference on Energy and Material Efficiency and CO2 Reduction in the Steel Industry, 2017.10.
37. Noritaka SAITO, Yusuke HARADA, and Kunihiko NAKASHIMA, “Electrical Capacitance Measurement for Dualphase Fluid at High Temperature”, ECTP2017, 21st European Conference on Thermophysical Properties, 2017.09.
38. Yusuke HARADA, Noritaka SAITO, and Kunihiko NAKASHIMA, “Impedance Measurement of Alkali Silicate Melts under Alternating Current Field”, ECTP2017, 21st European Conference on Thermophysical Properties, 2017.09.
39. Yuji IWAMI, Tetsuya YAMAMOTO, Nobuyuki OYAMA, Hidetoshi MATSUNO, Noritaka SAITO, Sohei SUKENAGA, Kunihiko NAKASHIMA, “Improvement of Sinter Productivity by Control of Magnetite Ore Segregation in Sintering Bed”, IRON ORE 2017, 2017.07.
40. Noritaka SAITO, Yusuke HARADA, Kunihiko NAKASHIMA, “Quantifying Crystallinity of Oxide Melts by Electrical Capacitance Measurements”, The 2nd ISIJ-VDEh-Jernkontoret Joint Symposium (The 15th ISIJ-VDEh Seminar, The 9th Japan-Nordic Countries Joint Symposium on Science and technology of Process Metallurgy), 2017.06.
41. Noritaka SAITO, Kunihiko NAKASHIMA, “Joining of ZrB2-MoSi2 Composite using Powder-based Metallic Interlayer”, PACRIM12, 12th Pacific Rim Conference on Ceramic and Glass Technology, 2017.05.
42. Noritaka SAITO, Kunihiko NAKASHIMA, “Wettability and Joining of UHTC”, The Energy, Materials, and Nanotechnology (EMN) Meeting on Ceramics 2017, 2017.04.
43. Noritaka SAITO, “Behavior of Silicate Melts under an Alternating Current Field”, Yonsei Emerging Steel Innovation Forum 2017, 2017.02.
44. Tomoyuki HIGO, Noritaka SAITO, Kunihiko NAKASHIMA, Takeshi OSUGI, “Viscosity Measurement and Structural Analyses of Cesium Containing Ferro-silicate Based Slags”, ATPC2016, The 11th Asian Thermophysical Properties Conference, 2016.10.
45. Noritaka SAITO, Kunihiko NAKASHIMA, “Wetting Behavior and Joining of UHTC Boride Composite”, ATPC2016, The 11th Asian Thermophysical Properties Conference, 2016.10.
46. Noritaka SAITO, Kunihiko NAKASHIMA, Laura ESPOSITO, “Joining of UHTC Borides utilizing Interfacial Reaction against Metallic Interlayer”, ICC6, The 6th International Congress on Ceramics, 2016.08.
47. Ken KUROGI, Shuhei CHIKUDI, Kou BABAZONO, Kou HONDA, Noritaka SAITO, “Joining of UHTC to Refractory Metal by Cu-Nb TLP Interlayers”, PRICM9, Pacific Rim International Conference on Advanced Materials and Processing, 2016.08.
48. Sohei SUKENAGA, Daniel NEUVILLE, Pierre FLORIAN, Noritaka SAITO, Kunihiko NAKASHIMA, Hiroyuki SHIBATA, “Viscosity and Structure of Alkali Iron Silicate Melts with a Variety of Iron Oxidation State”, Goldschmidt2016, 2016.06.
49. Noritaka SAITO, Laura ESPOSITO, Toshio YONEIMA, Koichi HAYASHI, Kunihiko NAKASHIMA, “Joining of UHTC Composites using Metallic Interlayer”, The Society for Experimental Mechanics, 2nd International Symposium on Joining Technologies for Composites and Dissimilar Materials, 2016.06.
50. Yusuke HARADA, Noritaka SAITO, Kunihiko NAKASHIMA, “Quantitative Analysis for Crystallinity of Supercooled Slag Characterized by Electrical Capacitance Measurement”, MOLTEN2016, 10th International Conference on Molten Slags, Fluxes and Salts, 2017.05.
51. Sohei SUKENAGA, Pierre FLORIAN, Koji KANEHASHI, Noritaka SAITO, Kunihiko NAKASHIMA, Hiroyuki SHIBATA, “Detailed Local Structure of Fluorine and Alkali Atoms in Calcium Aluminosilicate Glasses by Solid-state Nuclear Magnetic Resonance (NMR) Spectroscopy”, MOLTEN2016, 10th International Conference on Molten Slags, Fluxes and Salts, 2017.05.
52. Noritaka SAITO, Yusuke HARADA, Sohei SUKENAGA, Kunihiko NAKASHIMA, “Electrical Capacitance Measurement of Calcium Silicate based Slags for Detection and Evaluation of Crystallization Behavior”, MOLTEN2016, 10th International Conference on Molten Slags, Fluxes and Salts, 2017.05.
53. Noritaka SAITO, Kunihiko NAKASHIMA, Laura ESPOSITO, Joining of UHTC Boride using Metallic Interlayer, The Energy, Materials, and Nanotechnology (EMN) Meeting on Ceramics 2016, 2016.01.
54. Sohei SUKENAGA, Yann GUEGUEN, Tetsuya NAGAHISA, Koji KANEHASHI, Noritaka SAITO, Kunihiko NAKASHIMA, Fabrice CÉLARIÉ, Tanguy ROUXEL, Hiroyuki SHIBATA, Viscosity of Alkali and Alkaline-earth Aluminosilicate Liquids, Eighth French Research Organizations -Tohoku University Joint Workshop on Frontier Materials (Frontier 2015), 2015.11.
55. Sohei SUKENAGA, Tomoyuki HIGO, Hiroyuki SHIBATA, Noritaka SAITO, Kunihiko NAKASHIMA, Surface Tension of CaO-SiO2-Al2O3-MgO Melts, Asia Steel International Conference 2015, 2015.10.
56. Yusuke HARADA, Noritaka SAITO, Kunihiko NAKASHIMA, Quantitative Analysis for Crystallinity of Super-cooled Silicate Melt Characterized by Electrical Capacitance Measurement, Asia Steel International Conference 2015, 2015.10.
57. Sohei SUKENAGA, Pierre FLORIAN, Koji KANEHASHI, Hiroyuki SHIBATA, Noritaka SAITO, Kunihiko NAKASHIMA, Dominique MASSIOT, Detailed Chemical Environment of Sodium Atoms in a Calcium Aluminosilicate Glass by Variety of 17O Solid-state NMR Techniques, International Commission on Glass Annual Meeting Bangkok 2015, 2015.09.
58. Yang Nan, Xing-Min Guo, 中島邦彦, 齊藤敬高, Influence of Magnesia Addition on Crystalline Phase in CaO-Fe2O3 Melt Crystallization, 日本鉄鋼協会 第170回秋季講演大会予告セッション「高温融体の物性・構造と熱力学」, 2015.09.
59. Noritaka SAITO, Sohei SUKENAGA, Kunihiko NAKASHIMA, Rheological Behavior and Empirical Model of Simulated Foaming Slag, 日本鉄鋼協会 第170回秋季講演大会国際セッション「Development of process technology and fundamental research for the promotion of lime dissolution into slag」, 2015.09.
60. Sohei SUKENAGA, Koji KANEHASHI, Hiroyuki SHIBATA, Noritaka SAITO, Kunihiko NAKASHIMA, Structural Role of Alkali Cations in Calcium Aluminosilicate Glass by 17O solid-state Nuclear Magnetic Resonance (NMR) Sspectroscopy, Challenges and Transformative Solutions to Sustainable Steelmaking and Casting for Environment-Friendly Metallurgical Innovation (CTSSC EMI Symposium), 2015.05.
61. Yusuke HARADA, Noritaka SAITO, Kunihiko NAKASHIMA, Effect of Agitation on Crystallization and Rheological Behavior of Super-cooled Calcium Silicate Based Melts Characterized by Electrical Capacitance Measurement, 19th Symposium on Thermophysical Properties, 2015.06.
62. Sohei SUKENAGA, Tomoyuki HIGO, Koji KANEHASHI, Hiroyuki SHIBATA, Noritaka SAITO, Kunihiko NAKASHIMA, Additive Effect of K2O on Viscosity and Structure of CaO-SiO2-Al2O3 Melt, 20th European Conference on Thermophysical Properties (ECTP 2014), 2014.09.
63. Tomoyuki HIGO, Sohei SUKENAGA, Noritaka SAITO, Kunihiko NAKASHIMA, Experimental Evaluation and Empirical Modeling for Rheological Behavior of Dual-phase Fluids, Shechtman International Symposium, 2nd International Symposium on Advanced Sustainable Iron and Steel Making, 2014.06.
64. Sohei SUKENAGA, Tomoyuki HIGO, Koji KANEHASHI, Hiroyuki SHIBATA, Noritaka SAITO, Kunihiko NAKASHIMA, Viscosity of CaO-SiO2-Al2O3-K2O Melts and Solid State NMR Study of Glasses, Sixth French Research Organizations -Tohoku University Joint Workshop on Frontier Materials (Frontier 2013), 2013.12.
65. Noritaka SAITO, Kenta YAMASHIMA, Sohei SUKENAGA, Kunihiko NAKASHIMA, Viscosity Evaluation of Slag Foam, 8th International Symposium on Advanced Science and Technology in Experimental Mechanics, 2013.11.
66. Noritaka SAITO, Sohei SUKENAGA, Kunihiko NAKASHIMA, Crystallization and Rheological Behavior of Calcium Silicate Melts under Shear Stress, 10th Asian Thermophysical Properties Conference (ATPC2013), 2013.09.
67. Noritaka SAITO, Sohei SUKENAGA, Yoshio OHTA, Kunihiko NAKASHIMA, Effect of Agitation on Crystallization Behavior of Super-cooled Melts Characterized by Electrical Capacitance Measurement, 166th ISIJ Meeting, International Organized Session High Temperature Processes, Innovations in measurement of high temperature property and application to materials production process, 2013.09.
68. Sohei SUKENAGA, Tomoyuki HIGO, Koji KANEHASHI, Hiroyuki SHIBATA, Noritaka SAITO, Kunihiko NAKASHIMA, Viscosity of CaO-SiO2-Al2O3-K2O System, 166th ISIJ Meeting, International Organized Session High Temperature Processes, Innovations in measurement of high temperature property and application to materials production process, 2013.09.
69. Sohei SUKENAGA, Tomoyuki HIGO, Hiroyuki SHIBATA, Noritaka SAITO, Kunihiko NAKASHIMA, Effect of K2O Addition on the Viscosity of CaO-SiO2-Al2O3 Melt, Goldschmidt Conference, 2013.08.
70. Laura ESPOSITO, Diletta SCITI, Laura SILVESTRONI, Cesare MELANDRI, Stefano GUICCIARDI, Andreas M. GLAESER, Noritaka SAITO, Kunihiko NAKASHIMA, Transient-liquid-phase Bonding of HfC-based Ceramics, 13th International Conference and Exhibition of the European Ceramic Society, 2013.06.
71. Noritaka SAITO, Hiroyuki IKEDA, Andreas M. GLAESER, Kunihiko NAKASHIMA, Transient Liquid Phase Bonding and Wettability of HfB2-MoSi2 Composites with Nb based Alloy, The 10th Pacific Rim Conference on Ceramic and Glass Technology, 2013.06.
72. Kei Nishimura, Noritaka SAITO, Andreas M. GLAESER, Kunihiko NAKASHIMA, Joining of Zr-based UHTC Composite with Reactive Metals, The 10th Pacific Rim Conference on Ceramic and Glass Technology, 2013.06.
73. Noritaka SAITO, Sohei SUKENAGA, Kunihiko NAKASHIMA, Effect of Agitation on Crystallization Behavior of Molten Calcium Silicates Characterized by Electrical Capacitance Measurement, ISIJ-VDEh-Jernkontoret Joint Symposium (The 14th ISIJ-VDEh Seminar, The 8th Japan-Nordic Countries Joint Symposium on Science and technology of Process Metallurgy), 2013.04.
74. Sohei SUKENAGA, Pierre FLORIAN, Dominique MASSIOT, Noritaka SAITO, and Kunihiko NAKASHIMA, Cation Micro-segregation in Alkali and Alkaline-earth Aluminosilicate Glasses, 日本鉄鋼協会高温プロセス部会高温物性値フォーラム 平成24年度第2回 高温物性値フォーラム研究会~酸化物の構造解析および関連研究室の見学会〜, 2012.12.
75. Noritaka SAITO, and Kunihiko NAKASHIMA, Effect of Agitation on Crystallization of Calcium Silicate Based Slags, The 4th Australia-China-Japan Joint Symposium on Iron and Steelmaking, 2012.11.
76. Noritaka SAITO, Kakeru KUSADA, Sohei SUKENAGA, and Kunihiko NAKASHIMA, Effect of Shear Stress on Crystallization Behavior of Calcium Silicate based Melts, ICS2012 5th International Congress on the Science and Technology of Steelmaking 2012, 2012.10.
77. Shinichiro HARUKI, Yunsuke RINE, Sohei SUKENAGA, Noritaka SAITO, and Kunihiko NAKASHIMA, Desulphurisation of Molten Steel by CaO Particles Dispersed Slag, ICS2012 5th International Congress on the Science and Technology of Steelmaking 2012, 2012.10.
78. Noritaka SAITO, Effect of Agitation on Crystallization Behavior of CaO–SiO2–R2O (R = Li, Na, or K) System Characterized by Electrical Capacitance Measuremen, 日本鉄鋼協会高温プロセス部会精錬フォーラム, 2012.09.
79. Noritaka SAITO, Kakeru KUSADA, Sohei SUKENAGA, Kunihiko NAKASHIMA, Stirring Effect on Crystallization Behavior of Molten Calcium Silicates Characterized by Electrical Capacitance Measurement, The 8th Japan-Korea Workshop on Science and Technology of Ironmaking and Steelmaking, 2012.09.
80. Yoshinori YAMAOKA, Noritaka SAITO, and Kunihiko NAKASHIMA, Effect of Zirconia on Sintering of HfB2-MoSi2 Composite, IFAMST-8 8th International Forum on Advanced Materials Science and Technology, 2012.08.
81. Hadi Razavi KHOSROSHAHI, Xin LIU, Noritaka SAITO, Kunihiko NAKASHIMA, and Kenji KANEKO, Optimization of Two-step Sintering Schedule for Y2O3 Ceramics, IFAMST-8 8th International Forum on Advanced Materials Science and Technology, 2012.08.
82. Noritaka SAITO, Kakeru KUSADA, Sohei SUKENAGA, Mikito KITAYAMA, Yoshio OHTA, and Kunihiko NAKASHIMA, Effect of Shear Stress on Crystallization and Rheological Behavior of Molten Calcium Silicates, IFAMST-8 8th International Forum on Advanced Materials Science and Technology, 2012.08.
83. Shinichiro HARUKI, Sohei SUKENAGA, Noritaka SAITO, and Kunihiko NAKASHIMA, Effect of Aggregation Degree of Dispersed Particle on Viscosity of Suspension, IFAMST-8 8th International Forum on Advanced Materials Science and Technology, 2012.08.