Language：English   Publishing type：Research paper (scientific journal)  

DOI： https://doi.org/10.3390/coatings12101535

Language：English   Publishing type：Research paper (scientific journal)  

DOI： https://doi.org/10.1016/j.est.2022.104955

DOI： https://doi.org/10.3390/pr10050804

DOI： https://doi.org/10.1016/j.jeurceramsoc.2021.06.043.

Language：English  

DOI： 10.1021/acsomega.1c06751

PubMed

Language：English   Publisher：The Society of Chemical Engineers, Japan  

<p>Low-thermal-conductive reaction-bonded silicon nitride (RBSN), with a thermal conductivity of 8.08 W/(m·K), was developed by the addition of mullite micro-powder as a rare-earth-free oxide sintering agent to silicon nitride. This addition was expected to generate a glassy grain boundary as well as a solid solution of oxygen across the microstructure of the RBSN, which leads to low thermal conductivity. During the fabrication of a heat-insulating component with a hollow structure made of the RBSN via slip casting and subsequent reaction sintering, it was found that the viscosity of aqueous silicon-mullite slurries decreased evidently by the addition of the mullite micro-powder with ammonium polycarboxylate as a dispersant. The viscosity decreased even though the pH (7–8) of the slurries were maintained, and the particle size distributions did not vary significantly. At the effective mullite content when the viscosity decrease was attained, the ratio of the number of particles of mullite to silicon was approximately 1. Therefore, the viscosity decrease in Si slurry (50 vol%) was primarily caused by the steric hindrance due to the adsorption of dispersant by the mullite particles, preventing the direct contact among the silicon particles, rather than by electrostatic repulsions among the silicon particles. This was also explained through the modality of bimodal dispersion. Thus, it was found that the mullite not only acts as a sintering agent but also facilitates viscosity decrease of highly concentrated aqueous Si slurry, which successfully enables the integration of the slip casting and reaction sintering processes.</p>

DOI： 10.1252/jcej.20we173

CiNii Research

Language：Japanese   Publisher：The Japan Institute of Energy  

<p>It is meaningful to predict and design the efficiency of large-scale circulation systems in advance. However, since various energies and substances are input and discharged into the system in different qualities and shapes, it cannot be said that an index or method for evaluating the efficiency has been established. We are focusing on exergy as an index showing the common resource properties of substances and energy, and are developing an exergy graph tool (tentative name) that can be applied especially to the design of large-scale circulation systems. This time, we verified the effectiveness of the graph tool for ceramic processes using waste silicon.</p>

DOI： 10.20550/jietaikaiyoushi.30.0_166

CiNii Research

Authorship：Corresponding author  

DOI： https://doi.org/10.1252/jcej.20we173

DOI： 10.1111/jace.17584

Web of Science

Authorship：Corresponding author  

DOI： https://doi.org/10.1016/j.diamond.2021.108423.

DOI： 10.1007/s11249-021-01406-0

Web of Science

DOI： 10.1016/j.wear.2020.203418

Web of Science

Language：Japanese   Publisher：The Japan Institute of Energy  

<p>Quantification is necessary to evaluate and optimize an artifact system from an energy perspective. Since various substances and energies have changed into various shapes and qualities in the flow of the steady open system on the earth including the artificial system, the scale (index) is limited. Exergy analysis of artifact manufacturing process.</p><p>In this report, we focused on exergy, which is a physical quantity associated with substances and energy, and which combines the first and second laws. The absolute value of exergy is the value obtained by multiplying the entropy by the environmental temperature, and exergy can be regarded as a concept that also includes entropy.Taking advantage of this property, it is possible to determine the total It is possible to calculate the effective energy reduction amount.</p>

DOI： 10.20550/jietaikaiyoushi.29.0_188

CiNii Research

DOI： 10.1080/10402004.2020.1734705

Web of Science

DOI： 10.1080/21870764.2020.1769819

Web of Science

DOI： 10.1016/j.jeurceramsoc.2020.02.062

Web of Science

DOI： 10.1016/j.matdes.2020.108528

Web of Science

DOI： 10.1016/j.jmrt.2020.09.022

Web of Science

DOI： 10.1108/ILT-08-2019-0350

Web of Science

DOI： 10.1016/j.ceramint.2019.08.008

Web of Science

Language：English   Publisher：The Ceramic Society of Japan  

<p>Influence of both surface roughness and surface morphology on frictional behavior of ceramics during run-in period under dry sliding was investigated simultaneously. Similar average surface roughness (R_a = 0.01–0.02 µm) was produced for the three ceramics: monolithic boron carbide ceramics, boron carbide-silicon carbide composite ceramics and monolithic silicon carbide ceramics. Surface roughness parameters show some influence on friction processes, however, surface morphology is considered as a more important competitive factor. Lower friction coefficient during run-in period and shorter sliding distance up to the steady state condition were observed for the B₄C–SiC composite ceramics, which has a different surface morphology from those of monolithic B₄C ceramics and monolithic SiC ceramics.</p>

DOI： 10.2109/jcersj2.19124

Web of Science

CiNii Research

DOI： 10.1016/j.ceramint.2019.04.078

Web of Science

Language：Japanese   Publisher：The Japan Institute of Energy  

<p>In the modern society, the promotion of energy saving while reducing the amount of waste is an important issue for modern humanity. There are two points in recycling of material. The first is the reduction of input exergy in the circulation system and the balance between cost and raw material supply between waste and recycled products. On the other hand, with the spread of electric vehicles, heat insulation technology for automobile interior parts has attracted attention. Conventionally, a composite of polypropylene using an inorganic filler has been used as an interior heat insulating material. In this study, we examined substitution of shredded paper to inorganic filler. We aim at exergy analysis of the use of fibrous paper, polypropylene and blends for thermal insulation and the effectiveness of their recycling. The surface of the composite of paper fiber and polypropylene was analyzed using a scanning electron microscope (SEM). We also calculate exergy analysis, which I would like to show in the presentation.</p>

DOI： 10.20550/jietaikaiyoushi.28.0_286

CiNii Research

DOI： 10.1080/17436753.2019.1574285

Web of Science

Language：English   Publisher：The Ceramic Society of Japan  

<p>The fracture mechanism and reliability of typical dense ceramics can be statistically analyzed using a Weibull distribution as a basis for device design. However, it is not understood if the Weibull distribution can even be applied to highly porous ceramics. In this study, porous Siliconized Silicon Carbide (Si–SiC) ceramics with anisotropic three-dimensional network structures in a porosity range of 71–92% were fabricated and subjected to a fracture analysis using the results of three-point bending tests. Observations of fracture behavior during the bending tests were conducted using a high-speed camera, image analysis of stress distribution, and observation of crack distribution inside the partially damaged specimens using X-ray computed tomography. The results indicate non-linear behavior with multiple peaks in the load–displacement curves. In this regard, the fracture mechanism of the porous Si–SiC ceramics was intrinsically different from the brittle fracture of dense ceramics and did not appear to be based on the weakest-link model. However, the Weibull distribution was found to be applicable to the bending strength of the porous ceramics with a confidence coefficient of 0.90. This was because although strain and cracks were generated sporadically during loading, the catastrophic fracture of the porous Si–SiC ceramic specimens occurred with a macroscopic crack opening at the bottom of the test specimens, almost the same as a Mode I crack opening in dense ceramics. Furthermore, graded three-layer structures can be formed integrally using the proposed novel replication method with uniaxial pressing, taking the plateau of the stress–strain curve of the template polyurethane foam into account, providing a kind of damage tolerance owing to the sporadic generation and sequential propagation of cracks, manifested as the multiple peaks shown in the load–displacement curves.</p>

DOI： 10.2109/jcersj2.18209

Web of Science

CiNii Research

Language：Japanese   Publisher：The Japan Institute of Energy  

<p>Regenerative burner system is one of the most effective utilization heat energy system in which high-temperature waste heat from industrial furnace, and so far heat storage tank filled with ceramics sensible heat storage body is used. Currently, as heat storage body, Al₂O₃ ball has been used, however, for further compactification of the system, the development of new heat storage body with higher heat input rate and energy density have been required. In this study, a hollow tetrapod structure was devised as a modified shell structure made of fine ceramics. This structure aims to increase the heat transfer area by using the outside and inside surfaces of the heat storage body and to reduce the weight of the heat storage tank. The hollow tetrapod structure was made by slip cast molding method. It was experimentally considered that he heat storage rate for a short time of the packed bed of hollow Al₂O₃ tetrapod was increased in compared with the case of conventional Al₂O₃ body.</p>

DOI： 10.20550/jietaikaiyoushi.27.0_292

CiNii Research

Language：Japanese   Publisher：The Japan Institute of Energy  

<p>Regenerative burner system generally ignites a pair of burners integrated with the heat reservoirs alternately at intervals of several tens of seconds. While one burner is burning, the exhaust gas passes through and heats the other burner’s heat reservoir to recover the energy of the exhaust gas. Then, when the other burner burns, the air for combustion in turn passes through the preheated heat reservoir to recover the exhaust gas energy which had conventionally been wasted, to provide high efficient combustion. In recent years, and energy saving of further industrial furnace is required, we are towards the efficiency improvement and downsizing of this regenerative burner system, it was decided to proceed with the research and development that focuses on the wall structure of the heat storage body using fine ceramics.</p>

DOI： 10.20550/jietaikaiyoushi.26.0_314

CiNii Research

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publisher：The Society of Chemical Engineers, Japan  

<p>Authors have been developing a spherical container having an inner wall constructed with skeletal ceramic units for transporting molten aluminum. This container is expected to provide innovative weight reduction and higher heat retaining property compared with current cylindrical containers having an inner wall made of castable refractory. In this study, a spherical inner wall with a combinative structure was designed: molten contacting part of the inner wall was constructed with skeletal unit made of reaction bonded silicon nitride (RBSN), while the non-contacting part with molten was constructed with skeletal unit made of aluminum titanate (AT). The quantity of heat emission from the container, temperature drop of molten in the container and thermal stress at the inner wall, while holding the molten, were simulated by heat transfer analysis. As a result, the spherical container reduced the quantity of heat emission compared with an inner wall constructed with only the RBSN unit, and was more reliable compared with that with only the AT unit. Thus, the new inner wall which enables a combination of light weight, high heat retaining property and reliability was proposed.</p>

DOI： 10.1252/jcej.15we122

CiNii Research

Language：Japanese   Publisher：Hosokawa Powder Technology Foundation  

<p>Layered metal hydroxide salts powder have anisotropic surface charge on the plate-like particles derived from their layered crystal structure. The aggregation structure of layered metal hydroxide in the water phase were specific such as cardhouse structure because of surface electrostatic charge distribution depend on the pH condition. We suggest the partly hetero coagulation structure using the electrostatic charge distribution on the surface of layered metal hydroxide particle as newly anisotropic composite process. In this study, Mg-based layered hydroxide salt particle, which was our developed multi-step chemical heat storage material, and sub-micron Al₂O₃ particles were used as hetero coagulation particle for the reaction packing bed on chemical heat storage system. The hetero coagulation structure of Mg-LHS and Al₂O₃ particles was generated at pH 7. It was found that hetero coagulation particles was effective to make packing bed for high reaction speed and high thermal storage density. It was assumed that packing bed of hetero coagulation powder have porous structure with high density and the pass structure of water vapor.</p>

DOI： 10.14356/hptf.14122

CiNii Research

Authorship：Lead author   Language：Japanese  

Porous ceramics have been applied for large area such as filter, insulator, catalyst
support due to these high chemical stability and heat resistance. Porous gypsum mold was
used in slip casting process used ceramic slurry and these property have been analyzed
experimentally. However, the mechanical strength and chemical stability of gypsum mold
were not enough high in order to improve the productivity and durability. In this study,
porous Al 2 O 3 / Al 2 O 3 fiber composite filter was fabricated by template free method using
anisotropic sintering behavior of Al 2 O 3 particle and fiber. The effect of experimental
condition on permeability, mechanical strength and slip casting property of Al 2 O 3 slurry of
porous Al 2 O 3 filer with Al 2 O 3 fiber was investigated as compared with gypsum mold.

Language：English   Publisher：The Japan Society of Mechanical Engineers  

DOI： 10.1299/jsmeatem.2015.14.148

CiNii Research

Language：Japanese   Publishing type：Research paper (scientific journal)  

Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)  

Authorship：Lead author   Language：Japanese  

Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Event date： 2023.3

Language：Japanese   Presentation type：Oral presentation (general)  

Event date： 2022.9

Language：Japanese   Presentation type：Poster presentation  

Venue：幕張メッセ   Country：Japan  

Event date： 2022.9

Language：Japanese   Presentation type：Oral presentation (general)  

Event date： 2022.3

Language：Japanese   Presentation type：Oral presentation (general)  

Event date： 2021.12

Language：Japanese   Presentation type：Oral presentation (invited, special)  

Venue：オンライン  

Event date： 2021.9

Language：Japanese   Presentation type：Oral presentation (general)  

Event date： 2021.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：オンライン  

Event date： 2021.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：オンライン  

Event date： 2018.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東京ビックサイト   Country：Japan  

Event date： 2017.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：神戸大学   Country：Japan  

Event date： 2017.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：神戸大学   Country：Japan  

Event date： 2017.7 - 2017.8

Language：English   Presentation type：Oral presentation (general)  

Venue：Taiwan   Country：Japan  

Event date： 2017.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：芝浦工大   Country：Japan  

Event date： 2017.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：芝浦工大   Country：Japan  

Event date： 2016.6

Language：English   Presentation type：Oral presentation (general)  

Venue：Chongqing, China   Country：China  

Event date： 2015.12

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：名古屋大学   Country：Japan  

Event date： 2015.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：金沢大学   Country：Japan  

Event date： 2015.11

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2015.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：岐阜県高山市民文化会館   Country：Japan  

Mg系層状水酸化物粒子充填層の構造制御および化学蓄熱特性の評価に関する研究

Event date： 2015.7

Language：English   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2015.6

Language：English   Presentation type：Oral presentation (general)  

Country：Canada  

Event date： 2015.1

Language：English   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2014.5

Language：English   Presentation type：Poster presentation  

Country：China  

Event date： 2014.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：岐阜大学   Country：Japan