Ar+N_(2)气氛下烧结温度对多组分碳化物添加的Ti(C,N)基金属陶瓷组织和力学性能的影响  

Effects of Sintering Temperature on Microstructure and Mechanical Properties of Ti(C,N)-Based Cermet with Multi-Component Carbides in Ar+N_(2) Atmosphere

作　　者：刘超 姚兴旺 董涛 龙宁华[1,2] 张卫兵[2] 曾瑞霖 李剑峰 Liu Chao;Yao Xingwang;Dong Tao;Long Ninghua;Zhang Weibing;Zeng Ruilin;Li Jianfeng(Zhuzhou Cemented Carbide Group Co.,Ltd.,Zhuzhou Hunan 412000,China;State Key Laboratory of Cemented Carbide,Zhuzhou Hunan 412000,China)

机构地区：[1]硬质合金国家重点实验室,湖南株洲412000 [2]株洲硬质合金集团有限公司,湖南株洲412000

出　　处：《硬质合金》2024年第6期499-505,共7页Cemented Carbides

基　　金：国家重点研发计划项目(2022YFB3806702);湖南省科技创新计划项目(2023RC3238);湖南省自然科学基金项目(2022JJ50109,2024JJ7671);中钨高新科技专项(20220303)。

摘　　要：采用亚微米级Ti(C,N)和不同种类的超细碳化物,超细Co粉和Ni粉为原料,在Ar+N_(2)气氛下进行高温低压烧结制备Ti(C,N)基金属陶瓷。采用XRD、SEM研究Ti(C,N)基金属陶瓷的物相组成及微观形貌,利用维氏硬度仪测试、计算合金的维氏硬度及断裂韧性。结果表明:由于碳化物组元种类的增多,烧结温度和传统相比稍高;当烧结温度为1 470℃时,金属陶瓷的微观组织分布均匀,并没有出现明显的晶粒长大,并且物相只有(Ti,M)(C,N)(M=W、Mo、Nb、Ta)固溶相和Co+Ni黏结相,此时材料的硬度和断裂韧性达到最佳匹配(1 730HV10和8.02 MPa·m^(1/2)),通过烧结工艺的优化达到了组织和性能协同调控的目的。Ti(C,N)-based cermet was prepared by high temperature and low pressure sintering in Ar+N_(2) atmosphere with submicron Ti(C,N),different kinds of ultrafine carbides,ultrafine Co powder,and Ni powder as raw materials.The phase composition and microstructure of Ti(C,N)-based cermet were studied by X-ray diffraction(XRD)and scanning electron microscope(SEM).The Vickers hardness and fracture toughness of the specimens were calculated by the Vickers hardness tester.The results show that the sintering temperature is slightly higher than the traditional temperature due to the increase in the types of carbide components.When the sintering temperature is 1470℃,the microstructure distribution of the cermet is uniform,and there is no obvious grain growth.The phase only have(Ti,M)(C,N)(M=W,Mo,Nb,and Ta)solid solution phase and Co+Ni bonding phase.At this time,the hardness and fracture toughness of the specimens match the best(1730HV10 and 8.02 MPa∙m^(1/2)).Through the optimization of the sintering process,the cooperative regulation of microstructure and mechanical properties is realized.

关 键 词：Ti(C N)基金属陶瓷烧结温度 微观形貌 维氏硬度 断裂韧性 

分 类 号：TG1[金属学及工艺—金属学]