Hot pressing sintering process and sintering mechanism of W-La_(2)O_(3)-Y_(2)O_(3)-ZrO_(2)  

作　　者：Bao-Gang Fu Jian-Can Yang Zhi-Kun Gao Zuo-Ren Nie 

机构地区：[1]College of Materials Science and Engineering,Beijing University of Technology,Beijing 100124,China

出　　处：《Rare Metals》2021年第7期1949-1956,共8页稀有金属（英文版）

基　　金：the National Natural Science Foundation for Innovative Research Group Projects(No.51621003)。

摘　　要：The W-La_(2)O_(3)-Y_(2)O_(3)-ZrO_(2)materials were prepared by vacuum hot pressing sintering process.The microstructure was characterized by scanning electron microscopy(SEM).The effects of sintering temperature,sintering pressure,holding time and heating rate on relative density,hardness and microstructure were studied.The sintering activation energy of the powder was calculated.Based on the result,the best sintering parameters by vacuum hot pressing sintering are as follows:sintering temperature of 1600℃,sintering pressure of 60 MPa and holding time of 60 min.The heating rate is 10℃·min^(-1)from room temperature to 1000℃and 4℃·min^(-1)from1000 to 1600℃.Using this process,the grain size is about3 lm in diameter with relative density at 99.7%,and the hardness is HV 528.5.The sintering characteristic index(n)of the specimen is 4,and the sintering mechanism mainly depends on the diffusion from the surface to the intragranular in the volume diffusion.The sintering activation energy of W-La_(2)O_(3)-Y_(2)O_(3)-ZrO_(2)material is286.2 k J·mol^(-1),which indicates that the powder has higher activity in sintering process.

关 键 词：W-La_(2)O_(3)-Y_(2)O_(3)-ZrO_(2) Hot pressing sintering Relative density Tungsten electrode Sintering mechanism 

分 类 号：TF124.5[冶金工程—粉末冶金]