一种新型晶粒长大抑制剂对YG10硬质合金烧结行为的影响

Effects of a new type of grain growth inhibitor on sintering behavior of YG10 cemented carbide

研究了一种新型晶粒长大抑制剂对机械合金化制备的纳米晶WC-10Co复合粉末真空烧结行为的影响,探讨了其影响机理。研究结果表明:新型晶粒长大抑制剂有利于烧结致密化;在传统的过渡族元素碳化物基础上添加新型晶粒长大抑制剂,能明显提高复合抑制剂抑制晶粒长大效果,使WC晶粒在烧结过程中明显发生定向生长,抑制盘状WC晶粒的形成;含0.1%新型晶粒长大抑制剂的WC-10Co-0.8VC/Cr3C2纳米晶复合粉末压坯在1375℃烧结30min后密度为14.48g/cm3,WC晶粒尺寸为160nm,显微硬度为2.150GPa。

The effects of a new type of grain growth inhibitor on vacuum sintering behavior of nanograined WC-10Co powders produced by mechanical alloying as well as its affecting mechanism were investigated. The results show that the new grain growth inhibitor can promote sintering densification process. Adding the new inhibitor to traditional transitional group element carbides, composite inhibitors become much more effective, obviously induce oriented WC grain growth and evidently encumber plate like WC grain formation during sintering. For WC-10Co 0.8VC/Cr3C2 powders with 0.1% of the new additive, the density of 14. 48g/cm^3 can be achieved after sinteringat 1375℃ for 30min, corresponding to the grain size of 160 nm and the micro-hardness of 2.150 GPa.