TaC含量对TiCN基金属陶瓷组织与性能的影响  

Effect of TaC content on microstructure and properties of TiCN-based cermets

作　　者：陈敏[1] 肖玄[1] 张雪峰[2] 

机构地区：[1]攀枝花学院材料工程学院,攀枝花617000 [2]攀枝花学院资源与环境工程学院,攀枝花617000

出　　处：《粉末冶金材料科学与工程》2016年第2期270-275,共6页Materials Science and Engineering of Powder Metallurgy

基　　金：四川省应用基础研究项目(2014JY0132);攀枝花市创新人才培养计划资助项目(2015TX-11);攀枝花市科技支撑项目(2015CY-G-18;2013CY-G-7;2014CY-G-26-1)

摘　　要：以TiC,TiN,WC,Mo,Co,Ni和Ta C为原料制备TiCN基金属陶瓷,结合XRD,SEM&EDS和力学性能测试,研究TaC含量对TiCN基金属陶瓷物相组成、显微组织与力学性能的影响。结果表明:TiCN基金属陶瓷的硬质相为TiC_(0.7)N_(0.3),Mo C,TiWC_2和TiTaCN。粘结相Co,Ni固溶Ti,W,Mo,Ta元素形成Ti_(0.08)Ni_(0.92),TiCo_3,W_(0.15)Ni_(0.85),Co_(0.9)W_(0.1),Ta_(0.08)Ni_(0.92)和Mo_(0.09)Ni_(0.91)等。TiCN基金属陶瓷的显微组织由黑色相Ti(C,N)、灰色相(Ti,Mo,Ta,W)(C,N)和白色相(Ti,Mo,Ta,W)C-Co-Ni组成,形成黑芯-灰环及黑芯-白环-灰环包覆结构。随TaC含量增加,固溶相(Ti,Ta,W,Mo)(C,N)的含量与黑芯-白环-灰环包覆结构相增加,TiCN基金属陶瓷的抗弯强度提高,硬度略有下降。适宜的TaC添加量为9%,所得金属陶瓷的抗弯强度和硬度HV分别为1 299 MPa和1 252 MPa。TiCN-based cermets were prepared by using TiC, TiN, WC, Mo, Co, Ni and Ta C as raw materials. The effect of Ta C content on phase composition, microstructure and mechanical properties of TiCN-based cermets were investigated by XRD, SEM, EDS and mechanical properties tests. The results show that the carbide phases of TiCN-based cermets are TiC0.7N0.3, Mo C, TiWC2, TiTa CN and the binder phases are Ti0.08Ni0.92, TiCo3, W0.15Ni0.85, Co0.9W0.1, Ta0.08Ni0.92, Mo0.09Ni0.91 solid solutions formed among Co, Ni and Ti, W, Mo, Ta elements. The microstructures of TiCN-based cermets are composed of black core-grey ring and black core-white ring–grey ring surrounding structures with Ti（C,N） black phase,Ti,Mo,Ta,WC,N grey phase andTi,Mo,Ta,WC-Co-Ni white phase. With increasing Ta C contents, the amount of solid solution phaseTi,Ta,W,MoC,N and black core-white ring–grey ring structures increase, and the bending strength of TiCN-based cermets increases and hardness decreases slightly. The optimum addition of TaC is 9%, with the bending strength and Vickers hardness of the cermet being 1 299 MPa and 1 252, respectively.

关 键 词：TAC TICN 金属陶瓷 显微组织 力学性能 

分 类 号：TG148[一般工业技术—材料科学与工程]