αとβ-SiC混合粉末から作られた多孔体におこる粒成長の促進(<特集>イノベーティブセラミックス(I))

概要

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a- and β-SiC powders and their powder mixtures with 0.3 mass% of A1B_2 additive were sintered at 2200℃. Porous materials having approximately 55-57% theoretical density were obtained from the powders. Grains in the porous material prepared from α-SiC powder grew into round-shaped grains with a 4μm size, and those prepared from β-SiC powder grew into plate-shaped grains with the same size. Grain growth was considerably enhanced in the powder mixtures forming a locking structure with plate-shaped grains. The mean grain sizes of the porous materials from the powder mixtures were 5.6-8.2μm. β(3C)-SiC in the powder mixtures was transformed completely to a, that is, 6H and small amounts of 4H and 15R. An energy difference accompanied by β-to-α transformation enhanced grain growth. The strength of the porous materials prepared from the mixtures was 70-83 MPa.
社団法人日本セラミックス協会の論文
2005-01-01