Change of Morphology during Heating of Amorphous Composite Powder in Si3N4-BN System (特集 アモルファス・ナノ結晶制御と高機能材料)
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概要
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Amorphous composite powders are useful to fabricate ceramic nanocomposite. The nanostructure is formed by phase separation and crystallization during sintering. Si<SUB>3</SUB>N<SUB>4</SUB>-BN composite powder was prepared by a vapor phase reaction method and heated in N<SUB>2</SUB> with and without Y<SUB>2</SUB>O<SUB>3</SUB>-Al<SUB>2</SUB>O<SUB>3</SUB> sintering aid. Particle coarsening was observed above 1400°C in monolithic Si<SUB>3</SUB>N<SUB>4</SUB>, whereas the particle growth was retarded in Si<SUB>3</SUB>N<SUB>4</SUB>-BN composite. α-Si<SUB>3</SUB>N<SUB>4</SUB> was detected above 1400°C in monolithic Si<SUB>3</SUB>N<SUB>4</SUB>, but Si<SUB>3</SUB>N<SUB>4</SUB>-BN composite was still amorphous even at 1600°C. When the sintering aid was used, β-Si<SUB>3</SUB>N<SUB>4</SUB> was formed at 1600°C in monolithic Si<SUB>3</SUB>N<SUB>4</SUB> and Si<SUB>3</SUB>N<SUB>4</SUB>-BN composite. The phase separation of BN was investigated by IR spectroscopy. The phase separation of Si<SUB>3</SUB>N<SUB>4</SUB>-BN composite powder became significant at 1600°C and the crystallization was stimulated by the sintering aid. It was confirmed from TEM observation that BN was segregated on the surface of Si<SUB>3</SUB>N<SUB>4</SUB> particle.
- 社団法人 粉体粉末冶金協会の論文
- 2000-04-15
著者
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UEHARA Masato
Department of Veterinary Medicine, Tottori University
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Hojo Junichi
Department of Applied Chemistry, Faculty of Engineering, Kyushu University
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Uehara Masato
Department Chemistry & Biochemistry Graduate School Of Engineering Kyushu University
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MAEDA Hideaki
Department of Molecular and Material Sciences, Interdiscplinary Graduate School of Engineering Scien
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Eto Koji
Department Of Medicine (cardiology) Teikyo University School Of Medicine
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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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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
Department Chemistry & Biochemistry, Graduate School of Engineering, Kyushu University
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