稀土元素在硬质合金中的分布和存在形态

DISTRIBUTION AND EXISTENT MORPHOLOGY OF RARE EARTHS IN CEMENTED CARBIDE

研究了稀土元素在硬质合金中的分布和存在形态。结果表明:液相烧结温度下,稀土金属原子吸附在WC/液相(YG合金)和(Tj,W)C/液相(YT合金)界面上;室温下,稀土元素在WC/γ相和(Ti,W)C/γ相界面处富集;在WC/γ相界和γ相中有球状析出物(含有稀土元素)存在。初步推测,稀土在此处以原子态存在,但不排除以化合状态存在的可能。

In this paper, the distribution and existent morphology of rare earths in cemented carbide have been studied. The results have shown that rare earth metal will be absorbed on the interface of WC/liquid phase (WC—Co alloys) and (Ti, W) C/liquid phase (TiC-WC-Co alloys) at liquid-phase sintering temperature. Rare earth elements are richly aggregated on the interface of WC/γ, phases and (Ti,W)C/γ phases at room temperature. The spheroidal precipitates(containing RE) exist at the interrace of WC/γ phases and in γ phase. It is inferred initially that rare earth elements exist as atomic state here, but the possibility of its existance as compound also can not be ruled out.