Oxidation property and homogenization treatment of plasma sintered beryllides

プラズマ焼結ベリライドの酸化特性及び均質化処理

金 宰煥; 中道 勝

Kim, Jae-Hwan; Nakamichi, Masaru

As a part of the Broader Approach (BA) activities by means of the International Fusion Energy Research Centre (IFERC) project with Japan and EU, we have investigated the plasma sintering method for synthesis of beryllides which is considerably simple and easy to control, compared to conventional methods. Using this method with different conditions, beryllides were successfully synthesized. In order to evaluate the stability at high temperature, in this study, using the samples with different sintering time in connection with different phase distribution, oxidation property at high temperature of 1273 K was investigated. With increasing the sintering time on plasma sintering process, oxidation resistance increased. However, it was confirmed that degradations in mechanical property and chemical stability at high temperature were induced by existence of BeTi phase. Accordingly, we have investigated the effect of annealing treatment on phase stability. As temperature increased at 1473 K, it was confirmed that BeTi phase which attributed to degradations as well as Be phase were eliminated but others did not show any variation while there was no variation of phase for the treatment at 1273 K for 1 hr. However, annealing treatment at 1673 K for 1 hr resulted in homogenizing to only BeTi phase. From this result, by controlling the annealing time after synthesis of beryllide, BeTi phase which is compositional target could be homogenized.