炭化ケイ素の焼結に及ぼすメカノケミカル効果

概要

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Aluminium-doped beta silicon carbide powders were activated mechano- chemically by fine grinding in a vibration ball mill. The resultant powders doped with metallic boron (0.2%) and carbon (2%) was normally sintered under Argon flow, and the effect of mechanochemical activation on the densification of β-SiC was investigated. The results obtained are as follows (1) The moldability of the ground powders decreased remarkably. The mechanochemical activation made very little contribution to the densification of β-SiC and accelerated only the surface diffusion at lower temperatures. (2) Fine powders with the average particle size of 0.29μm and maximum size of ca.1.0μm is recommended as a starting powder. (3) The ground powders showed a large weight loss during sintering, and stimulated the growth of plate-like crystals at elevated sintering temperatures. The plate- Like crystals tend to retard the extensive consolidification of β-SiC.
社団法人日本セラミックス協会の論文
1986-12-01