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采用化学镀获得Ni-Yb_2O_3复合粉体,然后通过机械球磨制备了不同质量分数的W-(0.2%,0.5%,1%,2%)Ni/Yb_2O_3复合粉末,最后在1600℃下烧结3 h获得了W-Ni/Yb_2O_3复合材料。采用场发射扫描电子显微镜(FE-SEM)分析了Ni-Yb_2O_3复合粉体形貌、W-Ni/Yb_2O_3复合材料表面形貌,测定了W-Ni/Yb_2O_3复合材料相对密度、显微硬度和热导率。结果表明,W-Ni/Yb_2O_3复合材料的相对密度和显微硬度随着Ni-Yb_2O_3含量增加而增加,Ni-Yb_2O_3的加入促进了钨基材料的烧结致密化;同时,添加Ni-Yb_2O_3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。
The Ni-Yb_2O_3 composite powders were obtained by electroless plating, then the powders of W- (0.2%, 0.5%, 1%, 2%) were prepared by mechanical milling and sintered at 1600 ℃ for 3 h W-Ni / Yb_2O_3 composites were obtained. The morphology of the Ni-Yb_2O_3 composite powder and the surface morphology of the W-Ni / Yb_2O_3 composite were characterized by field emission scanning electron microscopy (FE-SEM). The relative density, microhardness and heat of the W-Ni / Yb_2O_3 composite were measured. Conductivity. The results showed that the relative density and microhardness of W-Ni / Yb_2O_3 composites increased with the increase of Ni-Yb_2O_3 content, and the addition of Ni-Yb_2O_3 promoted the sintering densification of tungsten-based materials. At the same time, the addition of Ni-Yb_2O_3 The grain of tungsten-based materials to be refined, but the thermal conductivity of tungsten-based materials play a role in reducing.