Sn做助剂机械合金化+热处理制备Ti_3AlC_2

Fabrication of Ti_3AlC_2 by Mechanical Alloying and Heat Treatment with Sn Aids

以3Ti/Al/2C/0.1Sn粉体为原料,进行机械合金化,并对粉体产物进行热处理,制备高含量Ti3AlC2材料,并分析了产物的微观形貌。机械合金化3Ti/Al/2C粉体,可合成TiC、Ti3AlC2和Ti2AlC混合粉体产物。添加适量Sn可消除产物中的Ti2AlC,明显促进Ti3AlC2合成。对粉体产物进行热处理,可以提高产物Ti3AlC2含量。热处理温度过低或过高都不利于Ti3AlC2含量的提高。随着热处理温度的提高,晶粒长大明显,烧结倾向加剧,研磨困难。在900℃可以获得质量分数为95.2%的Ti3AlC2。热处理产物颗粒比较细小,可做复合材料的原料。

High-content Ti3AlC2 material was fabricated with 3Ti/Al/2C/0.1Sn powder mixtures as starting material by mechanical alloying and further heat treatment. Micro-morphology was observed. Mixed powders of TiC, Ti3A1C2 and Ti2AlC can be obtained by mechanical alloying 3Ti/Al/2C powder mixtures. Addition of appropriate Sn could remove Ti2AlC and significantly enhance the synthesis of Ti3AlC2 The content of Ti3AlC2 can be evidently improved by heat treatment. Too lower or too higher temperature is not good for the increase of Ti3AlC2 content. As the temperature increasing, the grains grow obviously and the sintering tendency intensifies, which makes it harder to grind. The highest content of Ti3AlC2 is 95.2 wt% at 900℃. As the particle size of the products is fine, they are suitable to be raw materials for composite material.