【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。更多还原

【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)℃.更多还原