摘要
以Ti,Al和TiN粉体为原料,采用自蔓延高温合成技术制备Ti_2AlN材料,研究原料配比对反应合成Ti_2AlN的影响,并分析Ti_2AlN的形成机制。结果表明:Ti/Al/TiN体系自蔓延高温合成产物主要由TiN,Al_3Ti和Ti_2AlN组成。原料中适当添加过量的Al或Ti,均可显著促进Ti_2AlN的合成,其中添加过量Ti对促进Ti_2AlN合成的作用更明显。而降低TiN的用量对促进Ti_2Al N合成的作用最明显,可获得高Ti_2AlN含量的钛铝氮材料。自蔓延高温合成Ti_2AlN的反应机制为Ti和Al反应合成Ti-Al化合物,同时形成Ti-Al液相;然后Ti-Al液相包裹住TiN晶粒;最后以TiN晶粒为核心,TiN晶粒逐渐与周围的Ti-Al液相反应合成板条状Ti_2AlN。
Ti2AlN was fabricated through self-propagation high temperature synthesis using Ti/Al/TiN powders as raw materials. The effect of raw material ratio on the synthesis of Ti2AlN was investigated. The reaction mechanism of Ti2AlN formation was also studied. The results show that the majority products are TiN, Al3 Tiand Ti2AlN in the synthesized materials. Adding excessive Al or Tiin the raw materials can effectively enhance the synthesis of Ti2AlN. Decreasing TiN content in the raw materials significantly enhances the synthesis of high content Ti2AlN. A formation mechanism for the synthesis of Ti2AlN is proposed. Firstly, Tireacts with Al to form Ti-Al compound. Meanwhile, Ti-Al liquid forms. And then, the Ti-Al liquid coats and infiltrates TiN grains. Finally, TiN grains react with Ti-Al liquid to form Ti2AlN with lath-like shape using TiN grains as cores.
出处
《粉末冶金材料科学与工程》
EI
北大核心
2016年第2期276-281,共6页
Materials Science and Engineering of Powder Metallurgy
基金
河南省基础与前沿技术研究计划资助项目(132300410164)
河南省省院科技合作项目(122106000051
142106000193)
河南省教育厅自然科学研究计划资助项目(12A430024
13A430128
14A430007)
郑州市人才引育项目(141PRCYY514)
河南省科技开放合作项目(142106000051)
关键词
Ti2AlN
自蔓延高温合成
原料配比
反应机制
陶瓷
Ti2AlN
self-propagation high temperature synthesis（SHS）
raw materials ratio
reaction mechanism
ceramic
