炭化ケイ素微粉体の焼結における粒度配合効果

概要

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Sintering behavior of binary mixture of SiC powders was investigated by using powders having average particle sizes d=0.01-0.02, μ and 0.04-0.45μ. Binary powder mixing had little effect on the green density of compact, but increased the density of sintered body, fired at 2050°C for 30 min, at the coarse powder fraction around 85%. For example, a powder mixture of 15% of fine powder having d=0.01μ and 85% of coarse powder having d=0.08 μ gave relative density of 98%, against the component fine and coarse powders gave relative density of 90% and 57%, respectively. Sinterability of binary mixture of 15% fine-85% coarse powders both of which were produced by CVD method increased with increase of particle size ratio and became constant above the ratio ≈8. This enhanced sinterability may be due to a particle rearrangement effect and a detardation of growth of coarse particles by the presence of fine powders in the course of heating.
社団法人粉体粉末冶金協会の論文