TaC含量对Ti(C_(0.7),N_(0.3))基金属陶瓷组织和性能的影响  

Effect of TaC Content on Microstructure and Properties of Ti(C_(0.7),N_(0.3))-based Cermet

作　　者：陈庚[1,2] 孙文文 方琴[1] 王正云[3] 王泽忠[1] 李力[2] CHEN Geng1, SUN Wenwen3, FANG Qin1, WANG Zhengyun3, WANG Zezhong2, LI Li2(1.Sichnan Laboratory of Aerial Material Testing and Die Forging Technology, Sichuan Engineering Technical College, Deyang 618000, China; 2.Chongqing Key Laboratory of Micro/Nano Materials Engineering and Technology, Chongqing University of Arts and Science, Chongqing 402160, China; 3.School of Materials Science and Engineering, Xihua University, Chengdu 610039, China)

机构地区：[1]四川工程职业技术学院四川省航空材料检测与模锻工艺技术工程实验室,四川德阳618000 [2]重庆文理学院重庆市高校微纳米材料工程与技术重点实验室,重庆402160 [3]西华大学材料科学与工程学院,四川成都610039

出　　处：《铸造技术》2018年第10期2205-2208,共4页Foundry Technology

基　　金：四川省德阳市科技支撑项目(2017ZZ048)

摘　　要：以Ti(C_(0.7),N_(0.3))、TaC、WC、C、Co、Ni以及Mo粉为原料,利用粉末冶金法制备了Ti(C_(0.7),N_(0.3))基金属陶瓷。使用XRD、SEM、硬度计和万能试验机等研究了不同的Ta C含量对金属陶瓷显微组织和性能的影响。结果表明,金属陶瓷的组织呈现出"芯-壳"结构,随着Ta C含量的增加,环形相包覆得更加完整,晶粒尺寸明显细化,当Ta C含量超过4%时,部分颗粒开始发生团聚、长大,环形相越来越厚;随着Ta C含量的增加,金属陶瓷的硬度和断裂韧性呈现出不断下降的趋势,而抗弯强度先升后降。综合来看,当添加Ta C含量为4%时,金属陶瓷具有最佳的综合力学性能,其硬度、抗弯强度和断裂韧性分别达到了88.7 HRA、1 297 MPa和10.0 MPa·m^(1/2)。The Ti（C0.7,N0.3）, TaC, WC, C, Co, Ni and Mo powder were used as raw materials to prepare Ti （C0.7, N0.3）-based cermet. The effect of different TaC contents on microstructure and mechanical properties of the cermet were studied by means of XRD, SEM, hardness tester and universal testing machine. The results show that the microstructure of the cermet presents a ＇core-rim＇ structure, with the increase of TaC content, the rim clads more completely and the grain size is obviously refined. When the content of TaC is more than 4%, some particles begin to be agglomerated and grow, and the rim phases become thicker. With the increase of TaC content, the hardness and fracture toughness of the cermet show a decreasing trend, and the bending strength increases first and then decreases. When the content of TaC is 4%, the cermet has the best comprehensive mechanical properties, and the hardness, transverse rupture strength and fracture toughness are 88.7 HRA, 1297 MPa and 10.0 MPa-m1/2, respectively.

关 键 词：TAC 金属陶瓷 组织与性能 

分 类 号：TG148[一般工业技术—材料科学与工程]