微細原料粉末を用いたTiB_2-TaB_2-CoB-TiC系焼結体の機械的特性に及ぼすTiC添加効果

概要

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TiB_2-5% TaB_2-1% CoB materials obtained from fine powder have the porosity of 0.3-0.7 vol%. Effect of TiC addition on the densification was studied for eliminating the residual pores. TiB_2-5% TaB_2-1% CoB-1.7% TiC materials have lower porosity of 0.1-0.2 vol%. It is thought that lower porosity occurs when TiC, Ta and O_2 form a solid solution of (Ti, Ta) (C, O) during the sintering stage and the C which was precipitated from TiC deoxidized the raw powder at the same time. Also TiB_2-5% TaB_2-1% CoB-1.7% TiC materials have almost the same transverse rupture strength as those of TiB_2-5% TaB_2-1% COB materials. It has been found that there are three factors that affect the transverse rupture strength. One is a lower oxygen content, which is a positive factor. The second is a larger average grain size of TiB_2, which is a negative factor. The third is the solid solution phase of (Ti, Ta) (C, O) described above, which is an unknown f actor.
社団法人日本セラミックス協会の論文
1988-07-01