Spark Plasma Sintering of Al_2O_3-TiC and AL_2O_3-TiC-Diamond Composites(Materials, Metallurgy & Weldability)
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概要
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Spark plasma sintering characteristics of Al_2O_3-TiC and Al_2O_3-TiC-diamond composites were investigated. Samples prepared in the ratio of 70:30wt% of Al_2O_3-TiC and 67:23:10vol% of Al_2O_3-TiC-diamond were sintered at 1350 to 1500℃ for 5 min under a pressure of 40MPa by the spark plasma sintering method. Diamond particles were coated with thin silicon carbide layer. No additive was used Samples sintered were characterized in respect to microstructural and mechanical properties. The results revealed that nearly 99% of theoretical density in Al_2O_3-TiC composites was obtained, but densities are remarkably lower in samples with diamond. Contrary to this, the toughness of Al_2O_3-TiC-diamond composite in higher than that of Al_2O_3-TiC. ceramics. Hardness of Al_2O_3-TiC-Diamond composite is also lower than Al_2O_3-TiC composites. These results were attributed to the lower thermal expansion coefficient of diamond and its tendency to convert to graphite.
- 大阪大学の論文
著者
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Miyamoto Yoshinari
Osaka University
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ZEYTIN Sakin
Osaka University
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KASHIWAGI Takehiko
Osaka University
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Zeytin Sakin
Osaka University:sakarya University
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