W-Ni/Yb_2O_3复合材料的制备及烧结性能  

Preparation and Sintering Performance of W-Ni/Yb_2O_3 Composite Materials

作　　者：赵美玲[1] 罗来马[1,2] 王爽[1] 谭晓月 朱晓勇[1,2] 昝祥[1,2] 吴玉程[1,2] 

机构地区：[1]合肥工业大学,安徽合肥230009 [2]有色金属与加工技术国家地方联合工程研究中心,安徽合肥230009

出　　处：《稀有金属材料与工程》2016年第12期3181-3185,共5页Rare Metal Materials and Engineering

基　　金：国际热核聚变实验堆(ITER)计划专项资助项目(2014GB121001);国家自然科学基金面上项目(51474083)

摘　　要：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。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; then the powder was pressed and sintered at 1600 °C for 3 h. 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 are enhanced 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 refines the grains of the tungsten based material, but reduces its thermal conductivity.

关 键 词：化学镀 Ni-Yb2O3复合粉体 W-Ni/Yb2O3复合材料 晶粒细化 热导率 

分 类 号：TB333[一般工业技术—材料科学与工程]