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Comparative study of sinterability and thermal stability in plasma-sintered niobium and vanadium beryllides

Nb及びVベリライドにおける焼結性と熱安定性の比較研究

金 宰煥; 中道 勝

Kim, Jae-Hwan; Nakamichi, Masaru

Niobium and vanadium-beryllium intermetallic compounds (beryllides) were synthesized by plasma sintering under different sintering times at 1273 K. The beryllide with 7.7 at.% Nb mainly consisted of various phases of Be, Be$$_{12}$$Nb, Be$$_{17}$$Nb$$_{2}$$, and Be$$_{2}$$Nb, whereas that with 7.7 at.% V consisted of Be$$_{12}$$V, Be$$_{2}$$V, and V. As the sintering time increased, area fractions of the target compositions Be$$_{12}$$Nb and Be$$_{12}$$V increased while that of Be decreased. A comparative analysis demonstrated that the beryllide with 7.7 at.% Nb a showed higher density as well as a greater hardness than that with 7.7 at.% V, due to there being less difference between the sintering temperature and the melting point. In terms of thermal phase stability, the beryllide with 7.7 at.% Nb showed good thermal phase stability with fewer pores and a smaller unhomogenized area, because the beryllide contained a smaller area fraction of the Be phase, which may cause evaporation resulting in pore formation.

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パーセンタイル:86.18

分野:Chemistry, Physical

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