(1. 湖南工业大学 无机非金属材料工程技术湖南省重点实验室，
株洲 412007;
2. 中南大学 粉末冶金国家重点实验室， 长沙 410083)
摘 要: 用分段真空烧结、 背散射扫描电镜、 透射电镜和能谱分析等手段研究纳米Ti(CN)基金属陶瓷在烧结过程中的组织结构演变。 结果表明： 纳米Ti(CN)粉末金属陶瓷在1 200 ℃以后开始发生剧烈的固相反应， 纳米Ti(CN)粉末与M反应形成富M (M=Mo, W, Ta)的(Ti, M)(CN)固溶体为核， 贫M的(Ti, M)(CN)固溶体为环的“亮芯黑环结构”， 在1350 ℃即可获得致密的合金。 而微米金属陶瓷中Ti(CN)粉末颗粒很少参与固溶反应而成为核， 富钨和富Mo的固溶体为环， 形成“黑芯亮环结构”， 烧结温度在1 400 ℃以上才能获得致密合金。
关键字: 纳米Ti(CN); 金属陶瓷; 显微组织; 演变
（1. Key Laboratory of Inorganic and Nonmetal Materials Engineering Technology of Hunan Province, Hunan Industry University, Zhuzhou 412007, China;
2. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China）
Abstract: Using SEM/BSE, TEM/EDX and vacuum sintering in step temperature, the evolution of the microstructure of nano-Ti(CN) base cermets in sintering process was studied. The result indicates that nano-cermets begin solid state reaction acutely at 1 200 ℃, nano-Ti(CN) powder reacts with Mo to form (Ti, M)(CN) solid solution which is rich in M (M=Mo, W, Ta) and is the core of surrounding structure, (Ti, M)(CN) which is poor in M is the rim, it is “bright core dark rim surrounding structure”. The dense nano-cermets can be gained at 1 350 ℃. But the micron-Ti(CN) powder grains take part in solid reaction rarely and become core of surrounding structure, the solid solution which is rich in W and Mo is the rim, it is “dark core bright rim surrounding structure”. The dense micro-cermets can be gained above 1 400 ℃.
Key words: nano-Ti(CN); cermets; microstructure; evolution
