WC与钼质量比对TiC基金属陶瓷显微组织和性能的影响  

Effects of Mass Ratio of WC to Mo on Microstructure and Properties of TiC-based Cermets

作　　者：陈敏 张雪峰 朱军 朱俊杰 李佳 翁刘 周浩然 朱薪颖 张鑫 CHEN Min;ZHANG Xuefeng;ZHU Jun;ZHU Junjie;LI Jia;WENG Liu;ZHOU Haoran;ZHU Xinying;ZHANG Xin(School of Vanadium and Titanium,Panzhihua University,Panzhihua 617000,China;Sichuan Vanadium and Titanium Industrial Technology Institute,Panzhihua 617000,China;Rail Beam Factory,Pangang Group Panzhihua Steel Vanadium Co.,Ltd.,Panzhihua 617062,China;KLT Carbide Co.,Ltd.,Guanghan 618312,China)

机构地区：[1]攀枝花学院钒钛学院,攀枝花617000 [2]四川钒钛产业技术研究院,攀枝花617000 [3]攀钢集团攀枝花钢钒有限公司轨梁厂,攀枝花617062 [4]四川科力特硬质合金股份有限公司,广汉618312

出　　处：《机械工程材料》2024年第4期70-75,共6页Materials For Mechanical Engineering

基　　金：四川省自然科学基金资助项目(2022NSFSC0341);钒钛资源综合利用四川省重点实验室资助项目(2020FTSZ11);攀枝花市省级定向财力转移支付项目(22ZYZF-G-02,21ZYZF-G-01)。

摘　　要：制备了WC和钼总质量分数为8%,WC与钼质量比分别为1:4,2:3,3:2,4:1的TiC基金属陶瓷,研究了WC与钼质量比对试样显微组织和性能的影响。结果表明:不同WC与钼质量比试样中的硬质相均为芯-环结构,芯相主要为TiC,环相为(Ti,M)C(M为Mo,W,V);当WC与钼质量比大于1时,黏结相中原位析出(Ti,M)C纳米颗粒;随着WC与钼质量比增加,试样的抗弯强度、断裂韧度和硬度均先增大后减小,密度增加,当WC与钼质量比为3:2时,TiC基金属陶瓷的综合性能最佳,密度较高,硬度、抗弯强度、断裂韧度最大,分别为1546 HV,1200 MPa,6.61 MPa·m^(1/2);当WC与钼质量比小于1时,弯曲时试样中的硬质相发生穿晶断裂形成解理断面,黏结相发生撕裂变形形成粗糙断面;当WC与钼质量比大于1时,纳米颗粒从黏结相中拔出形成韧窝,WC与钼质量比越大,断口上的韧窝比例越少。TiC-based cermets were prepared with WC and Mo total mass fraction of 8%and mass ratios of WC to Mo of 1:4,2:3,3:2,4:1,and the effects of mass ratio of WC to Mo on the microstructure and properties of the samples were studied.The results show that the hard phases in the samples with different mass ratio of WC to Mo all had a core-ring structure.The core phase was mainly TiC,and the ring phase were mainly(Ti,M)C(M=Mo,W,V).When the mass ratio of WC to Mo was greater than 1,(Ti,M)C nanoparticles were in-situ precipitated in the binder phase.With the increase of the mass ratio of WC to Mo,the bending strength,fracture toughness and hardness of the samples increased first and then decreased,and the density increased.When the mass ratio of WC to Mo was 3:2,the comprehensive performance of TiC-based ceramics was the best,and the density was high,and the hardness,bending strength and fracture toughness were the largest,which were 1546 HV,1200 MPa,6.61 MPa·m^(1/2),respectively.When the mass ratio of WC to Mo was less than 1,the hard phase of the sample transgranularly fractured to form a cleavage section,and the binder phase was torn and deformed to form a rough section during bending.When the mass ratio of WC to Mo was greater than 1,the nanoparticle was pulled out from the binder phase to form a dimple.The larger the mass ratio of WC to Mo,the smaller the proportion of dimples on the fracture.

关 键 词：TIC基金属陶瓷 原位析出 WC 钼 性能 显微组织 

分 类 号：TF823[冶金工程—有色金属冶金] TB331[一般工业技术—材料科学与工程]