Microstructures and Mechanical Properties of Si3N4-SiC Composites Prepared by Combustion Synthesis and HIP Sintering (ナノメ-タコンポジット材料)

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概要

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• The microstructures and mechanical properties of Si<SUB>3</SUB>N<SUB>4</SUB>-SiC composites containing 8 to 46 vol% Sic, which were prepared from combustion synthesis and HIP sintering without additives, were studied and compared with those of Si<SUB>3</SUB>N<SUB>4</SUB> prepared from conventional methods. Transmission electron microscopic observation revealed the existence of some small SiC particles within the Si<SUB>3</SUB>N<SUB>4</SUB> matrix grains. The fracture toughness of the Si<SUB>3</SUB>N<SUB>4</SUB>-SiC composite was independent of Si, C content, probably because the SiC grains were smaller than the critical size for effective toughening and the formation of elongated Si<SUB>3</SUB>N<SUB>4</SUB> grains was not promoted by the Sic dispersions. But SiC additions modified the high-tempera-ture strength of the Si<SUB>3</SUB>N<SUB>4</SUB>-SiC composites and increased the microhardness at all temperatures.

• 社団法人 粉体粉末冶金協会の論文

著者

• NIIHARA Koichi

  ISIR, Osaka University

• Zeng Jian-ren

  ISIR, Osaka University

• Tanaka Isao

  ISIR, Osaka University

• Miyamoto Yoshinari

  ISIR, Osaka University

• Yamada Osamu

  College of General Education, Osaka Industrial University

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• Microstructures and Mechanical Properties of Si3N4-SiC Composites Prepared by Combustion Synthesis and HIP Sintering (ナノメ-タコンポジット材料)

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