Microstructure and Mechanical Properties of Sintered Bodies of Fine Powders in Si3N4-TiN System (特集 セラミックスのケミカルプロセッシング)
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概要
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Fine Si<SUB>3</SUB>N<SUB>4</SUB> powder and Si<SUB>3</SUB>N<SUB>4</SUB>-TiN composite powder were prepared by vapor phase reaction method, and hot-pressed to investigate the effects of sintering condition and TiN inclusion on the microstructure and mechanical properties of sintered bodies. The prepared powders were fine with the size below 0.05μm. Hot-pressing was conducted at 1800-1850°C in N<SUB>2</SUB> (1 atm) with 6wt% Y<SUB>2</SUB>O<SUB>3</SUB> and 2wt% Al<SUB>2</SUB>O<SUB>3</SUB> as sintering aid. When fine Si<SUB>3</SUB>N<SUB>4</SUB> powder was sintered at 1800°C, the sintered body had a fine-grained microstructure. By increase in temperature to 1850°C, rod-like grains grew in the fine matrix, resulting in an increase in fracture toughness. Fine TiN particles were dispersed in Si<SUB>3</SUB>N<SUB>4</SUB> matrix by sintering of Si<SUB>3</SUB>N<SUB>4</SUB>-TiN composite powder, indicating the formation of nanocomposite. In the composite system, the growth of rod-like grains was observed even at 1800°C. This suggests the acceleration of Si<SUB>3</SUB>N<SUB>4</SUB> grain growth by TiN inclusion. The composite had a high fracture toughness.
- 社団法人 粉体粉末冶金協会の論文
- 1998-01-15
著者
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Eto K
Kyushu Univ. Fukuoka
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Eto Koji
Department Chemistry & Biochemistry Graduate School Of Engineering Kyushu University
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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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UMEZU Motohiro
Department of Chemistry and Biochemistry, Graduate School of Engineering, Kyushu University
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UMEBAYASHI Seiki
Kyushu National Industrial Research Institute
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Umebayashi S
Kyushu National Industrial Res. Saga Jpn
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Umezu Motohiro
Department Of Chemistry And Biochemistry Graduate School Of Engineering Kyushu University
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Hojo Junichi
Department Chemistry & Biochemistry, Graduate School of Engineering, Kyushu University
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