W-Ni/Yb2O3复合材料的制备及烧结性能研究

本文首先采用化学镀获得Ni-Yb2O3复合粉体，然后通过机械球磨制备了不同成分的W-（0.2、0.5、1、2）wt% Ni/Yb2O3复合粉末，最后在1600℃下烧结3h获得了W-Ni/Yb2O3复合材料。采用场发射扫描电子显微镜(FE-SEM)研究分析了Ni-Yb2O3复合粉体形貌、W-Ni/Yb2O3复合材料表面形貌。测定了W-Ni/Yb2O3复合材料相对密度、显微硬度和热导率。实验结果表明，W-Ni/Yb2O3复合材料的相对密度和显微硬度随着Ni-Yb2O3含量增加而增加，Ni-Yb2O3的加入促进了钨基材料的烧结致密化；同时，添加Ni-Yb2O3复合粉使钨基材料的晶粒得到细化，但对钨基材料导热性起到降低的作用。

Preparation and sintering performance of W-Ni/Yb2O3 composite materials

In this paper, Ni coated Yb2O3 composite powder was obtained by electroless plating. The W-Ni/Yb2O3 composite powder dispersed with different contents of Ni coated Yb2O3 composite powder was first fabricated by the mechanical alloying (MA) process, the powder was then pressed and sintered at 1600 ?C for 3 hours. Surface morphology of Ni coated Yb2O3 composite powder and the W-Ni/Yb2O3 composite material were observed by FE-SEM. Relative density, microhardness and thermal conductivity of W-Ni/Yb2O3 composite material were tested. The results show that the relative density and microhardness of W-Ni/Yb2O3 composite material enhance with the increase of Ni-Yb2O3 contents, and the addition of Ni coated Yb2O3 composite powder promotes the sintering densification of W-Ni/Yb2O3 composite material. At the same time, the addition of Ni coated Yb2O3 composite powder makes the grain size of tungsten based material refined, but reduces its thermal conductivity.