纳米Ti(CN)基金属陶瓷烧结收缩和化学成分的变化
来源期刊：中国有色金属学报2006年第8期
论文作者：周书助 王社权 王零森 丁泽良
文章页码：1343 - 1348
关键词：纳米Ti(CN)；金属陶瓷； 烧结收缩； 化学成分； 力学性能
Key words：nano-Ti(CN); cermets; sintering shrinkage; chemical composition; mechanical properties
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1 400 ℃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1 100～1 300 ℃时迅速下降， 压坯中的氮含量在1 100 ℃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%。
Abstract: 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.
基金信息：国家高技术研究发展计划资助项目
