(合肥工业大学 材料科学与工程学院，合肥 230009)
摘 要: 采用真空烧结法制备纳米TiN改性的Ti(C, N)基金属陶瓷，研究不同金属相对纳米改性Ti(C, N)基金属陶瓷组织和力学性能的影响。结果表明：除经典的黑芯/灰壳组织外，添加纳米TiN的金属陶瓷在黑芯内还出现灰芯结构；纳米TiN主要分布在陶瓷相颗粒的晶界处；相对于未添加纳米TiN的金属陶瓷，添加纳米TiN粉末能明显提高金属陶瓷的抗弯强度、硬度与断裂韧性；对纳米TiN改性的金属陶瓷而言，金属相Ni能提供更好的抗弯强度与断裂韧性，而金属相Co则能带来更高的硬度。
关键字: 金属陶瓷；硬质相；粘结相；显微组织；力学性能
（School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China）
Abstract:The nano-TiN modified Ti(C, N)-based cermets were fabricated by vacuum sintering, and the effects of different metallic phases on the microstructure and mechanical properties of nano-TiN modified cermets were studied. The results show that the grey core microstructure exists in black core besides typical black core/grey rim, the nano-TiN locates at the ceramic phase boundaries. The results of mechanical properties show that the addition of nano-TiN powder can improve transverse rupture strength, hardness and fracture toughness of cermets clearly compared with that without TiN. The metallic phase Ni can bring much better transverse rupture strength and toughness while Co can offer much higher hardness in cermets modified by nano-TiN.
Key words: cermets; hard phase; binder phase; microstructure; mechanical properties
