Microstructure and Fracture Toughness of Sintered Bodies from Fine SiC Powder and SiC-TiC Composite Powder (特集 ナノ構造制御と新機能発現)
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概要
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Fine SiC powder and SiC-TiC composite powder were prepared by vapor phase reactions using Si(CH<SUB>3</SUB>)<SUB>4</SUB> and TiCl<SUB>4</SUB>. The particle size was about 200nm. They were hot-pressed at 2000°C in Ar with a sintering aid of Al<SUB>2</SUB>O<SUB>3</SUB> or Y<SUB>2</SUB>O<SUB>3</SUB>-Al<SUB>2</SUB>O<SUB>3</SUB> system. The sintered bodies were densified to 98-99% of theoretical. Rod-like grains were observed in monolithic SiC with both Al<SUB>2</SUB>O<SUB>3</SUB> and Y<SUB>2</SUB>O<SUB>3</SUB>-Al<SUB>2</SUB>O<SUB>3</SUB> system, and the higher fracture toughness was observed in Y<SUB>2</SUB>O<SUB>3</SUB>-Al<SUB>2</SUB>O<SUB>3</SUB> system. The fracture toughness was increased by TiC inclusions although the growth of rod-like SiC grains tended to be retarded. The growth of SiC grains was exaggerated in SiC-TiC composite powder with a large amount of Y<SUB>2</SUB>O<SUB>3</SUB>-Al<SUB>2</SUB>O<SUB>3</SUB> sintering aid, leading to more improved fracture toughness. The present results suggest that the improvement of fracture toughness can be enhanced by combination of rod-like SiC grain growth and TiC inclusion with Y<SUB>2</SUB>O<SUB>3</SUB>-Al<SUB>2</SUB>O<SUB>3</SUB> sintering aid.
- 社団法人 粉体粉末冶金協会の論文
- 1998-12-15
著者
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Uehara Masato
Department Chemistry & Biochemistry Graduate School Of Engineering Kyushu University
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Uehara Masato
Dept. Vet. Anat. Tottori Univ.
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Hojo J
Kyushu Univ. Fukuoka
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Hojo Junichi
Dept.of Applied Chemistry Faculty Of Eng. Kyushu Univ.
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Ogata Hirofumi
Dept. Chem. & Biochem. Grad. Sch. Eng. Kyushu Univ.
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MAEDA Hideaki
Dept. Chem. & Biochem., Grad. Sch. Eng., Kyushu Univ.
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Maeda H
National Institute Of Advanced Industrial Science And Technology
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Maeda Hideaki
Department Chemistry & Biochemistry Graduate School Of Engineering Kyushu University
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Hojo Junichi
Dept. Chem. Sci. & Tech., Fac. Eng., Kyushu Univ.
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Ogata Hirofu1mi
Dept. Chem. & Biochem., Grad. Sch. Eng., Kyushu Univ.
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