窒化アルミニウム-六方晶窒化ホウ素複合焼結体の特性に及ぼす原料混合条件の影響

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Aluminum nitride-hexagonal boron nitride ceramic composites were sintered by means of uniaxial hot pressing with changing the mixing conditions of raw materials. Mixed powders with a planetary-type milling had a larger surface area than those mixed with a rotary-type milling, which was a consequence of the fragmentation of the h-BN particles. The bulk density of the powder compact increased with increasing the specific surface area of the starting powders independent of the mixing conditions. The density of the isostatically cold pressed body reached about 74% of the calculated theoretical density. These results were thought to be caused by a bimodal particle-size distribution, suitable for dense compact during mixing, which also reduced the friction among particles during forming because of the excellent lubricant action of the h-BN. It was noticed that the maximum density in the sintered materials was achieved in correspondence of a specific surface area of the starting powders. The bulk densities of the sintered materials produced from small specific surface area powders increased with increasing the green density. On the other hand, the sintered density decreased because of the presence of fine h-BN particles which impeded the grain growth and the densification of AIN with a large specific surface area. It was considered that the densification of the composites is dominated by the densification of AIN.
社団法人日本セラミックス協会の論文
1998-05-01

窒化アルミニウム-六方晶窒化ホウ素複合焼結体の特性に及ぼす原料混合条件の影響

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