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1 350℃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。
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 ℃.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2006年第7期1184-1189,共6页
The Chinese Journal of Nonferrous Metals
基金
国家高技术研究发展计划资助项目(2002AA331090)
湖南省科技厅重点科研攻关资助项目(04GK2010)
