| Project/Area Number |
07555578
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
無機工業化学
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| Research Institution | NAGOYA UNIVERSITY |
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Principal Investigator |
TSUBAKI Jun-ichiro NAGOYA UNIVERSITY GRADUATE SCHOOL OF ENGINEERING,PROFESSOR, 工学研究科, 教授 (50109295)
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| Co-Investigator(Kenkyū-buntansha) |
YOKOYAMA Toyokazu HOSOKAWA MICRON CORPORATION,CHIEF RESEARCHER, 技術開発センター粉体工学研究所, 主席研究員
FUKUDA Yoshiyuki TOSHIBA COMPANY LIMITED,CHIEF RESEARCHER, 電気部品材料事業本部, 主任研究員
HOTTA Tadashi JAPAN FINE CREAMICS CENTER,CHIEF RESEARCHER, 試験研究所, 主任研究員
NAITO Makio JAPAN FINE CERAMICS CENTER,CHIEF RESEARCHER, 試験研究所, 主任研究員
MORI Hidetoshi NAGOYA UNIVERSITY GRADUATE SCHOOL OF ENGINEERING,RESEARCH ASSOCIATE, 工学研究科, 助手 (10144130)
吉田 宜史 名古屋大学, 工学部, 助手 (60262888)
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| Project Period (FY) |
1995 – 1997
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| Project Status |
Completed (Fiscal Year 1997)
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| Budget Amount *help |
¥7,800,000 (Direct Cost: ¥7,800,000)
Fiscal Year 1997: ¥7,500,000 (Direct Cost: ¥7,500,000)
Fiscal Year 1996: ¥300,000 (Direct Cost: ¥300,000)
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| Keywords | CERAMICS / SHAPING / SLURRY / SPRAY DRYING / VISCOSITY / SLIP CASTING / MICROSTRUCTURE / GRANULE |
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| Research Abstract |
For the purpose of characterizing slurry suspension applied in fine ceramics shaping process, developed has been an evaluation technique, centrifugal consolidation method, in which the mechanical properties of slurry are measured methodically by controlling the centrifugal effect. It has been demonstrated by performing experiments on slip-casting and die-press compaction under the various conditions of slurry preparation, that the centrifugal consolidation method is available for designing characteristics of slurry in order to control microstructures in green compacts. On the basis of the experimental results, an unique apparatus has been designed and constructed, which measures time changes in balancing moment stemming from the centrifugal consolidation of particles.
The slurry with high solids content is readily forced to form a particle network structure at the threshold, the formation mechanism of which originates in a slight dehydration of slurry. The critical solids content for th
… More
e network structure has been found to be as low as several vol%. It is demonstrated that it exists a relation between the centrifugal consolidation stress and the packing fraction, and that t0his relation can be interpreted to characterize the mechanical strength of the formed network structure, on which the solids content and the degree of flocculation exert a significant influence. It is also shown that the formation mechanism of microstructure in slip-casting process should be characterized by the transient behavior of filtrate and that the agglomerate structure, stemming directly from the interparticle forces between particles, significantly exerts an influence on the homogeneity of the formed green compacts.
Characteristic transient behavior of compaction process for spray-dried granules, have been investigated by using the compaction and stress-relaxation technique. Attention has been paid to the microstructure of granules as well as slurry characteristics, in order to identify the main factor governing the formation mechanism of granules. It is shown that the shape forming process is reasonably explained with the shrinkage process of spray-dried droplets, characteristics of which are methodically evaluated by applying the centrifugal consolidation method. Less
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