碳纳米管对硬质合金WC晶粒及强度的影响  

Effect of carbon nanotubes on WC grains and strength of cemented carbide

作　　者：岳立福 孙晓刚[1] 庞志鹏[1] 程晓圆 刘珍红 吴小勇[1] 聂艳艳[1] 

机构地区：[1]南昌大学机电工程学院,南昌330031

出　　处：《功能材料》2016年第3期200-204,共5页Journal of Functional Materials

基　　金：江西省科技厅科技计划资助项目(20142BBE50071);江西省教育厅科技计划资助项目(KJLD13006)

摘　　要：以碳纳米管为增强相,WC-10Co硬质合金为基体,采用湿法球磨工艺将多壁碳纳米管(Multiwalled carbon nanotubes,MWCNTs)和WC-10Co硬质合金粉料充分混合,通过真空烧结制成CNTs增强的WC-10Co硬质合金试样。采用SEM观测MWCNT在硬质合金基体中的分布和烧结后硬质合金微观结构。SEM显示碳纳米管嵌插在WC晶粒之间,抑制WC晶粒生长,使WC晶粒得到细化。试样横向断裂强度达到1 780 MPa,对比未增强试样提高了7.8%。A kind of cemented carbide was fabricated by the vacuum sintering process using multi-walled carbon nanotubes(MWCNTs)as the reinforcing phase and WC-10 Co as the matrix.The MWCNTs and WC-10 Co composite powder were mixed by wet-process ball-milling.The distribution of MWCNTs in cemented carbide matrix and the microstructure of sintered cemented carbide were observed by SEM.The results show that the carbon nanotubes were inserted in the WC grains boundary.This inhibited the growth of WC grains and finer grains were gained.The transverse rupture strength increased 7.8% and reached 1 780 MPa.,

关 键 词：多壁碳纳米管 硬质合金 细化晶粒 横向断裂强度 矫顽磁力 

分 类 号：TF125.3[冶金工程—粉末冶金]