用固溶体和单组元为原料制备的Ti(C,N)基金属陶瓷的组织与性能  

Microstructures and mechanical properties of Ti(C,N)-based cermets using solid solution type and interstitial phase type raw materials

作　　者：南晴[1] 张立[1] 解明伟[1] 冯于平[1] 王喆[1] 贺跃辉[1] 

机构地区：[1]中南大学粉末冶金国家重点实验室,长沙410083

出　　处：《粉末冶金材料科学与工程》2013年第3期320-325,共6页Materials Science and Engineering of Powder Metallurgy

基　　金：国家自然科学基金资助项目(51074189);高等学校博士学科点专项科研基金资助项目(20100162110001);湖南有色集团–中南大学有色研究基金资助项目(Y2012–010)

摘　　要：分别采用固溶体型TiC0.7N0.3和间隙相型单组元TiC、TiN为原料,制备TiC0.7N0.3-10WC-4Mo2C-3TaC-2.4Cr3C2-10Ni-10Co和TiC-10TiN-10WC-4Mo2C-3TaC-2.4Cr3C2-10Ni–10Co 2种Ti(C,N)基金属陶瓷,观察与分析这2种金属陶瓷的微观组织结构和力学性能。结果表明,尽管这2种金属陶瓷的硬质相与粘结相中化学组元的相对含量存在差异,但具有相同的物相成分,其中硬质相为含Ti、W、Mo、Ta、Cr的立方结构碳氮化物。与单组元原料相比,用固溶体型原料制备的金属陶瓷的微观组织结构均匀,硬质相的晶粒相对细小、芯–环结构完整、环部厚度适中,粘结相中Ti和Ta的含量与固溶度都较低,综合力学性能显著提高。从反应烧结过程中粘结相"触媒–联动"效应与反应扩散有序度的角度对这2种金属陶瓷的微观组织结构与性能的差异进行解释。Using solid solution type TiC0.7N0.3and interstitial phase type TiC and TiN as raw materials,the TiC0.7N0.3– 10WC–4Mo2C–3TaC–2.4Cr3C2–10Ni–10Co and TiC–10TiN–10WC–4Mo2C–3TaC–2.4Cr3C2–10Ni–10Co cermets were prepared by sinter-HIP at the temperature of 1 440 ℃ under a pressure of 6 MPa.The microstructures and mechanical properties were observed and tested.The results show that although there are differences in the relative contents of the chemical components of the hard phase and binder phase,both the Ti（C,N）-based cermets have the same phase composition.The hard phase is a cubic structured single-phase carbonitride containing Ti,W,Mo,Ta and Cr.As compared with monocomponent raw materials,the cermet prepared from TiC0.7N0.3 has homogeneous microstructure,finer grain size,more regular and stable core–rim structure,well coated core,thinner rim,lower Ti,Ta content and lower solid solubility in the binder phase,and accordingly much better mechanical properties.The differences in the microstructure and properties are explained in terms of the accelerant-linkage effect related with the binder phase and the degree of order in reaction-diffusion during the reaction-sintering process.

关 键 词：TI(C N)基金属陶瓷 TiC0 7N0 3固溶体 反应扩散 触媒–联动效应 微观组织结构 力学性能 

分 类 号：TG148[一般工业技术—材料科学与工程]