ナノSiC粒子分散によるAl_2O_3セラミックスの微細組織の制御

概要

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Al_2O_3/SiC composites were prepared by hot pressing in order to investigate the microstructural characteristics and nano disperse behavior of alumina matrix com posites. The grain size of the monolithic alumna ceramics increased with increasing hot pressing temperature, and the exaggerated grain growth occurred above 1800℃. However, the addition of SiC particulate effectively suppressed the growth of the alumina matrix in the composites. The average matrix grain size was smaller and the grain size distribution was narrower than those of the monolithic alumina ceramics. Very fine SiC particulate were well dispersed in composites as nano sized intragranular grains in the alumina matrix, on the other hand, coarse SiC particulate were found to exist at grain boundaries of the alumina matrix. The intragranular SiC seems to be trapped like a pores in the matrix grains during the densification by hot pressing. It is concluded that nano sized SiC particulate are grain growth inhibitors and microstructural stabilizers thus giving a uniform microstructures with fine grains.
社団法人日本セラミックス協会の論文
1994-09-01