摘要
通过液相磁力搅拌混合原料粉末钛、铝、石墨以及少量锡，压片后在1300～1400℃无压烧结合成了三元Ti3AlC2陶瓷。研磨粉碎后样品的x射线衍射（XRD）结果表明，在1300和1350烧结30min，可以得到Ti3AlC2相，同时存在Ti3AlC2相和TiC相的粉体。原料粉末为3Ti：1．0Al：1.8C：0．2Sn的样品在1400℃烧结30min后研磨，可以得到纯度较高的Ti3AlC2粉体，扫描电镜照片显示合成的鸭A嵫为层状结构，厚度约在50～100nm。结合差示扫描量热曲线和XRD图谱对合成反应机理进行了初步探讨，表明原始粉末首先在铝熔池中反应生成钛铝金属间化合物，随着温度的升高，生成有TiC，钛铝金属间化合物与石墨、TiC继续反应，最终合成Tj3AlC2。
The ternary carbide Ti3AlC2 ceramics was snthesized by pressure-less sintering the compressed circular disk,made of a mixture of Ti, Al, graphite, and a small amount of Sn powders, in 1300 - 1400℃ range in argon atmosphere. The impacts of the sintering conditions on the micmstructures and phase structures were evaluated. The powders, from the simered disk,were characterized with X-ray diffraction and scanning electron microscopy. The results show that the sintering temperature has a major impact on the micmstmctures and phase-strums. For instance, simtered in the 1300 1350℃ range for 30 min,Ti3AlC2 phase was found to coexist with Ti2AlC and TiC phases. Highly pure, Ti3AlC2 lamina grains,50- 100 nm in thickness.were observed in the powders,obtained by grinding the disk sintered at 1400℃ for 30 min, and with a mixture of 3.0Ti： 1.0Al： 1.8C ： 0.2 Sn as the starting materials. Possible mechanisms responsible for the formation of Ti3AlC2 were also tentatively discussed.
出处
《真空科学与技术学报》
EI
CAS
CSCD
北大核心
2014年第3期300-304,共5页
Chinese Journal of Vacuum Science and Technology
基金
国家自然科学基金资助项目(No.51275213)
江苏省研究生科技创新计划资助项目(No.CXLX12-0636)
关键词
钛合金
TI3ALC2
无压烧结
反应机理
微观结构
X射线衍射
Titanium alloy, Ti3AlC2, Pressureless simering, Synthesis mechanism, Micmstmcture, X-ray diffraction
