Effects of SiC Particles on α-β Phase Transformation and Mechanical Properties of Si3N4/SiC Composites (高次制御材料-1-<特集>)

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概要

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• Effects of SiC particle dispersions with average particle size in the range of 0.04-125μm on the α-β phase transformation and room temperature mechanical properties were investigated for Si<SUB>3</SUB>N<SUB>4</SUB>/SiC composites containing a 30vol% SiC particle. All composites were fabricated by hot pressing the mixture of sub-micron sized α-Si<SUB>3</SUB>N<SUB>4</SUB> and α or β-SiC powders using 8wt% Y<SUB>2</SUB>O<SUB>3</SUB> as a sintering additive. Addition of finest SiC particle (40nm) affected considerably the α-β phase transformation of Si<SUB>3</SUB>N<SUB>4</SUB> matrix and the microstructure was composed mostly of fine equiaxed grains. As increasing the size of added SiC particles, the α-β phase transformation and the grain growth of β-Si<SUB>3</SUB>N<SUB>4</SUB> were found to be promoted up to 25μm SiC and then saturated. As decreasing the size of added SiC particles, the fracture strength was increased and then saturated. The addition of finest SiC particle, however, was found to decrease the fracture strength drastically. The fracture toughness was increased as increasing the size of added SiC particles.

• 社団法人 粉体粉末冶金協会の論文

著者

• Niihara Koichi

  The Institute Of Scientific And Industrial Research Osaka University

• NAKAHIRA Atsushi

  The Institute of Scientific and Industrial Research, Osaka University

• Hirano Takeshi

  The Institute of Scientific & Industrial Research, Osaka University

• Nakahira Atsushi

  The Institute of Scientific & Industrial Research, Osaka University

• Niihara Koichi

  The Institute of Science and Industrial Research, Osaka University

• Hirano Takeshi

  The Institute of Scientific & Industrial Research, Osaka University

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