纳米Ti(CN)基金属陶瓷烧结收缩和化学成分的变化  

Evolvement of sintering shrinkage and chemical composition of millicron-Ti(CN) base cermets during sintering

作　　者：周书助[1] 王社权[2] 王零森[2] 丁泽良[1] 

机构地区：[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

出　　处：《中国有色金属学报》2006年第8期1343-1348,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)

摘　　要：采用分段真空烧结和化学分析等研究了纳米Ti（CN）基金属陶瓷压坯在烧结过程中的收缩行为、化学成分和性能的演变。实验表明：纳米混合料的压坯在低温下由于压制应力释放和剧烈的还原脱气（氧）反应造成压坯膨胀；压坯中出现液相的温度比微米Ti（CN）粉末压坯的要低50℃。由于高温氮的分解，造成合金在温度达到1400℃以后不但不收缩，反而膨胀；纳米Ti（CN）混合料压坯中的总碳含量和氧含量在600℃后逐步下降；压坯中的氧含量在1100～1300℃时迅速下降，压坯中的氮含量在1100℃以后才开始下降，在液相出现前形成高峰，氮含量越高，氮的损失越大。纳米混合料的压坯必须经过压力烧结后才能获得高致密的合金，其断裂韧性要比微米金属陶瓷提高50％。Using chemical analysis and vacuum sintering in different temperatures, the evolvement of the shrinkage, chemical composition and properties of the nano-Ti（CN） base cermets during sintering process were studied. Because of pressing stress was released and the deoxidizing and outgassing（oxygen） were happened tempestuously, the nano-cermets green compact was expanded at about 600 ℃. The temperature of liquid phase appear is lower about 50 ℃ than that of micro Ti（CN） powders. Because of the decomposition of nitrogen, the nano-Ti（CN） base cermets began to expand after 1 400 ℃. The total carbon and oxygen content in nano-cermets green compact decline gradually with the increase of sintering temperature, the oxygen content decline rapidly between 1 100 - 1 300 ℃. The nitrogen content in nano-cermets begins to decline, the decline reach floodtide before the liquid phase appear, the higher of nitrogen content in nano-cermets is, the higher the declining amount is. Only by pressure sintering could the dense alloy be gained, the fracture toughness of nano-Ti（CN） base cermets increase by 50% compared with the micron one.

关 键 词：纳米Ti(CN) 金属陶瓷 烧结收缩 化学成分 力学性能 

分 类 号：TG148[一般工业技术—材料科学与工程]