焼結過程で生成された黒鉛微結晶で分散強化されたTiCをマトリックスとする複合材料の製造と特性

概要

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Titanium carbide containing 5-15 wt% graphite was fabricated by hot-pressing at 2000°-2200℃ using carbon black as a starting carbon material. B_4C of 1 wt% was doped in TiC as sintering additive before mixing with carbon black. X-ray diffractometry and SEM revealed that the grain growth of TiC was suppressed significantly by the carbon addition, and that the carbon black changed to flaky graphite microcrystals 3-5 μm across and 0.5-2 μm thick. The graphite microcrystals were located at the TiC grain boundaries and even in TiC grains. Carbon addition increased the flexural strength of the composite appreciably. The composite with 10% carbon had the strength of 767 MPa, nearly double for monolithic TiC, 427 MPa. The fracture toughness of 6.72 MPa √<m> for the 10% carbon composite was obtained, as compared with 5.19 and 3.76 MPa √<m> for monolithic TiC doped with and without B_4C as a sintering additive, respectively.
社団法人日本セラミックス協会の論文
1989-05-01