炭化ケイ素焼結体のHIP処理

概要

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α-SiC and β-SiC starting powders mixed with 1 wt% B and 1 wt% C as densification aids, were pressed and normally sintered at 2000-2200°C. These sintered compacts and commercial sintered compacts (Kyo-sera, SC201) were HIPed without capsule using in 100 MPa Ar gas and N2 gas at 1700°C. Weight change, density and flexural strength were investigated, and the results obtained were summarized as follows: (1)The amount of weight gain during N2-HIP treatment which was remarkably large in case of low temperature sintered compacts (about 15%), was caused by the reaction between high pressure N2 gas and SiC. (2)The density of all specimens increased by HIP treatments, and the density of N2-HIPed compacts was increased with the weight gain. (3) The flexural strength of sintered a-SiC and commercial SiC compacts increased by HIP treatments, and the higher strength was obtained in case of N2-HIP treatment. It was considered that the flaw size in SiC compacts was apparently decreased by the rod like Si3N4 crystal which was formed y the reaction between N2 gas and SiC.
社団法人粉体粉末冶金協会の論文