热处理对金刚石颗粒表面钛包覆层组织与性能的影响  

Effect of heat treatment on the structure and properties of Ti coating deposited on the surface of diamond grains

作　　者：罗雯[1] 揭晓华[1] 蒙云开[2] 尹育航[2] 陶洪亮[2] 柯明月[1] 魏菊[2] 

机构地区：[1]广东工业大学材料与能源学院,广东广州510006 [2]广东奔朗新材料股份有限公司,广东佛山528313

出　　处：《金刚石与磨料磨具工程》2012年第4期27-30,36,共5页Diamond & Abrasives Engineering

基　　金：粤港招标项目(2011243);广东省教育部产学研结合项目(2011B090400178)

摘　　要：采用真空蒸发镀方法对金刚石颗粒表面进行镀钛处理,将镀钛金刚石分别在不同温度下进行真空热处理,用扫描电子显微镜、能谱仪和X射线衍射对金刚石颗粒的表面形貌、成分及其物相等进行分析,并采用金刚石单颗粒静压强度测定仪对其进行强度测试。结果表明:金刚石在880℃时开始碳化;钛包覆层只和碳化的金刚石发生界面反应,在880℃热处理温度下TiC先以点状形式析出,随着时间的延长,逐渐长大成雪花状,热处理温度为920℃时,镀层逐渐被氧化成TiO;TiC包覆层能够提高金刚石颗粒的热稳定性和静压强度,相对普通金刚石而言静压强度提高了14%。Ti coating was prepared on the surface of diamond grains by the method of vacuum evaporation,and then Ti-coated diamond grains were heated at different temperature respectively.The surface morphology,composition and phase of the coating were detected by SEM,EDS and XRD,and the static compressive strength of the diamonds were tested by the static compressive strength tester for single diamond grain.The results showed that the diamond grains were carbonized at the temperature of 880℃,and Ti coating could react with diamond at the interface.Punctiform TiC coating was generated at the temperature of 880℃,and with the time going on,it grew up into a snowflake shape.However,when the temperature reached 920 ℃,the Ti coating became gradually oxidized to be TiO;TiC coating can improve the thermal stability and static compressive strength of the diamond grains.Compared with uncoated diamond,the compressive strength of Ti-coated diamonds was increased by 14%.

关 键 词：金刚石 Ti镀层 界面反应 静压强度 

分 类 号：TQ164[化学工程—高温制品工业]