TaC对Ti(C_(0.7)N_(0.3))基金属陶瓷的物相、显微结构和力学性能的影响  

Effect of TaC on phase, microstructure and mechanical properties of Ti(C_(0.7)N_(0.3))-based cermets

作　　者：劳振勇 郭伟明[1] 罗展鹏 谭大旺 林华泰 LAO Zhenyong;GUO Weiming;LUO Zhanpeng;TAN Dawang;LIN Huatai(School of Electromechanical Engineering,Guangdong University of Technology,Guangzhou 510006,China)

机构地区：[1]广东工业大学机电工程学院,广州510006

出　　处：《复合材料学报》2022年第10期4927-4934,共8页Acta Materiae Compositae Sinica

基　　金：广东省引进创新科研团队计划(2013G061)。

摘　　要：为了制备高硬度高韧性的Ti(C_(0.7)N_(0.3))基金属陶瓷,采用1 600℃真空无压烧结制备了含TaC的Ti(C_(0.7)N_(0.3))-WC-Mo_(2)C-VC-AlN-Ni/Co系金属陶瓷,研究了不同TaC含量(0wt%、5wt%、10wt%、15wt%)对金属陶瓷的物相、显微结构、力学性能的影响。结果表明,随着TaC含量增加,Ti(C_(0.7)N_(0.3))(200)主峰逐渐向低角度偏移,环形相的厚度逐渐增大,金属陶瓷的维氏硬度和断裂韧性均先增大后减小。当TaC含量为10wt%时,核芯相细化,尺寸离散度最小,环形相发育更完整且均匀,金属陶瓷获得最高的维氏硬度和断裂韧性,分别为(17.79±0.15) GPa和(10.20±0.39) MPa·m^(1/2)。In order to prepare Ti(C_(0.7)N_(0.3))-based cermets with high hardness and high toughness, Ti(C_(0.7)N_(0.3))-WCMo_(2)C-VC-AlN-Ni/Co cermets containing TaC were prepared by vacuum pressureless sintering at 1 600℃. The effects of different TaC content(0wt%, 5wt%, 10wt%, 15wt%) on the phase, microstructure and mechanical properties of cermets were investigated. The results show that with the increase of TaC content, the main peak of Ti(C_(0.7)N_(0.3))(200) gradually shifts to a lower angle, the thickness of rim phase increase gradually and the Vickers hardness and fracture toughness of cermet firstly increased and then decreased. When 10wt% TaC is added, the core phase size of cermets is refined with the smallest, and the rim phase is more complete and uniform, leading to the maximum Vickers hardness((17.79±0.15) GPa and fracture toughness((10.20±0.39) MPa·m^(1/2) of cermet.

关 键 词：Ti(C_(0.7)N_(0.3))基金属陶瓷 TAC 物相 显微结构 力学性能 

分 类 号：TH145.9[一般工业技术—材料科学与工程]