チタン圧粉体の稠密化に及ぼすCo添加の影響

概要

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The sintering characteristics of Ti-Co binary mixed powder compacts containing up to 10 wt%Co were studied by the dilatometric method, and the diffusional process between Ti and Co during sintering was investigated by EPMA. The results obtained are summarized as follows: (1) The addition of Co was quite effective to the densification of titanium powder compacts. For example, the density of Ti-Co binary mixed powder compacts containing only 2 wt%Co sintered at 1573 K for 3.6 ks reached more than 99% of the theoretical value. (2) The contracting phenomenon observed in the high temperature range above 1073 K during sintering of Ti-Co binary mixed powder compacts was confirmed to be related to the network formation of the Co-rich phase along the surfaces of Ti powders. (3) The above mentioned Co-rich phase formed along the surfaces of Ti powders was clarified to be the very fine eutectoid structure composed of α-Ti and Ti2Co.
社団法人粉体粉末冶金協会の論文