(Ti,W)C对超细Ti(C,N)基金属陶瓷微观结构和力学性能的影响  

Effect of(Ti,W)C on Microstructure and Mechanical Properties of Ultrafine Ti(C,N)-Based Cermets

作　　者：贺逢源 熊健松 董定乾 熊萧 陈鑫辉 任少杰 熊慧文[3] HE Feng-yuan;XIONG Jian-song;DONG Ding-qian;XIONG Xiao;CHEN Xin-hui;REN Shao-jie;XIONG Hui-wen(College of Mechanical Engineering,Sichuan University of Science and Technology,Zigong 643000,China;Zigong Xili Numerical Control Tool Co.,Ltd.,Zigong 643011,China;State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China)

机构地区：[1]四川轻化工大学机械工程学院,四川自贡643000 [2]自贡市希力数控工具有限公司,四川自贡643011 [3]中南大学粉末冶金国家重点实验室,湖南长沙410083

出　　处：《稀有金属与硬质合金》2025年第1期56-65,共10页Rare Metals and Cemented Carbides

基　　金：国家自然科学基金项目(52374371,52074365);四川轻化工大学人才基金项目(2021RC18)。

摘　　要：采用低压烧结制备不同(Ti,W)C固溶体粉末含量的超细Ti(C,N)基金属陶瓷,并系统研究了(Ti,W)C对Ti(C,N)基金属陶瓷微观组织和力学性能的影响。研究表明:使用(Ti,W)C替代TiC+WC可导致金属陶瓷组织中白芯/环结构的形成,抑制黑芯/环结构的形成,同时硬质相形貌由立方形向球形转变;并且在保持抗弯强度不变的情况下,可提高金属陶瓷的维氏硬度和断裂韧性。低(Ti,W)C含量(2.5%~10%)条件下,随着(Ti,W)C含量的增加,金属陶瓷的黑芯尺寸减小,白芯/灰环结构增多,(Ti,W)C的加入使组织更加均匀,增强了晶粒间结合力;金属陶瓷硬度逐渐升高,抗弯强度和断裂韧性均先提升后降低,当(Ti,W)C含量为7.5%时,金属陶瓷具有最优异的综合力学性能,抗弯强度和断裂韧性分别为2212 MPa和9.0 MPa·m^(1/2)。Ultrafine Ti(C,N)-based cermets with different contents of(Ti,W)C solid solution powder were prepared by low pressure sintering.The effects of(Ti,W)C on the microstructure and mechanical properties of Ti(C,N)-based cermets were systematically studied.The results show that using(Ti,W)C instead of TiC+WC can lead to the formation of white core/ring structure in the microstructure of the cermets,and inhibit the formation of black core/ring structure.At the same time,the morphology of the hard phase changes from cuboidal to spherical.The Vickers hardness and fracture toughness of the cermets can be improved while keeping the bending strength unchanged.Under the condition of low(Ti,W)C content(2.5%~10%),with the increase of(Ti,W)C content,the size of the black core of the cermets decreases,and the white core/gray ring structure increases.The addition of(Ti,W)C makes the microstructure more uniform,enhancing the intergrain bonding force.And the hardness of the cermets increases gradually,while the bending strength and fracture toughness increase at first and then decrease.When the content of(Ti,W)C is 7.5%,the cermet has the best comprehensive mechanical properties,and the bending strength and fracture toughness are 2212 MPa and 9.0 MPa·m^(1/2),respectively.

关 键 词：超细Ti(C N)基金属陶瓷 (TI W)C 固溶体粉末 低压烧结 微观组织 力学性能 

分 类 号：TG148[一般工业技术—材料科学与工程]