Microstructure and Properties of MoSi2 and MoSi2-SiC Sintered Bodies Obtained from Fine Powders (金属間化合物の粉末冶金と諸物性<特集>)
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概要
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Fine MoSi<SUB>2</SUB> powder and MoSi<SUB>2</SUB>-10wt%SiC composite powder (particle size: ca. 1μm) prepared by a carbothermal reduction process were hot-pressed at 1600-1900°C to investigate the microstructure and mechanical properties of the sintered bodies. The sintered density of synthesized MoSi<SUB>2</SUB> powder reached 97% of theoretical at 1700°C but decreased at a higher temperature. MoSiZ SiC composite powder re-quired a high temperature of 1800°C for densification. Commercial MoSi<SUB>2</SUB> powder (particle size: 6-12μm) was densified to 99% at a low temperature of 1600°C. The low sinterabilities of the synthesized powders were caused by the formation of closed pores with grain growth. Although the sintered bodies of the commercial powder had the high density, the hardness and fracture toughness were low. On the other hand, the sintered bodies of the synthesized powders had high hardness and fracture toughness owing to the fine microstructures. The hardness and fracture toughness were further improved by SiC inclusions.
- 社団法人 粉体粉末冶金協会の論文
- 1995-11-15
著者
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Hojo J
Kyushu Univ. Fukuoka
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Hojo Junichi
Department Of Applied Chemistry Faculty Of Engineering Kyushu University
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Kishi Kazushi
Kyushu National Industrial Research Institute
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UMEBAYASHI Seiki
Kyushu National Industrial Research Institute
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ISHIZAKA Yasunori
Kyushu University
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Umebayashi S
Kyushu National Industrial Res. Saga Jpn
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Hojo Junichi
Department Chemistry & Biochemistry, Graduate School of Engineering, Kyushu University
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