化学成分对TiC-Ni系金属陶瓷显微组织的影响  

Effect of Chemical Composition on the Microstructure of TiC-Ni Series Cermets

作　　者：章晓波[1] 刘宁[1] 袁红梅[2] 荣春兰[1] 

机构地区：[1]合肥工业大学材料科学与工程学院,安徽合肥230009 [2]株洲硬质合金集团有限公司,湖南株洲412000

出　　处：《硬质合金》2008年第1期6-11,共6页Cemented Carbides

基　　金：日本玻璃板基金(No.301-00287);安徽省自然科学基金(No.03044902)项目资助

摘　　要：为探究Mo、WC、ZrC对TiC-Ni系金属陶瓷组织的影响,真空烧结制备了TiC- Ni系金属陶瓷。利用X射线衍射仪(X-ray diffraction,XRD)、扫描电子显微镜(scanning electron microscope,SEM)、能谱仪(energy dispersive spectrometer,EDS)等研究了Mo、WC和ZrC对金属陶瓷显微组织的影响。结果表明,TiC基金属陶瓷的显微组织随着Mo、WC、ZrC的加入而逐渐细化,形成(Ti,Mo)C、(Ti,Zr,Mo)C、(Ti,Mo,W)C、(Ti,Zr,Mo,W) C、(Zr,Ti,Mo)C和(Zr,Ti,Mo,W)C等固溶体,并且在10%TiC-40%ZrC-14%Mo-15% WC-20%Ni-1%C试样中出现了无芯晶粒(coreless grains)、微裂纹及微孔洞。断裂韧性测试结果表明,该显微结构能大大提高材料的断裂韧性。TiC-Ni series cermets were fabricated by vacuum sintefing in order to study the effect of Mo, WC and ZrC on the microstructure of thera. The effects of Mo, WC and ZrC on the microstructure of cermets were studied by using X-ray diffraction （XRD）, scanning electron microscopy （SEM） and energy dispersive spectrometer （EDS）. The experimental results show that the microstructures of cermets get finer with the addition of Mo, WC and ZrC and the solid solutions of （Ti, Mo）C,（Ti, Zr, Mo）C,（Ti, Mo, W）C,（Ti, Zr, Mo, W）C,（Zr, Ti, Mo）C and （Zr, Ti, Mo, W）C et al, are formed. Furthermore, coreless grains, micro cracks and micro pores, which can toughen the cermets greatly according to the result of fracture toughness measurement, appear in 10%TiC-40%ZrC-14%Mo-15%WC-20%Ni-1%C series cermets.

关 键 词：金属陶瓷 显微组织 微裂纹 断裂韧性 

分 类 号：TG148[一般工业技术—材料科学与工程]