球磨工艺对机械合金化合成Ti3SiC2的影响

Effect of Ball milling Parameters on the Synthesis of Ti3SiC2 by Mechanical Alloying

摘要:

以3Ti/Si/2C/0.2Al单质混合粉体为原料，采用机械合金化法制备Ti3SiC2材料。研究球磨工艺(球磨时间、球料比和球径大小、过程控制剂)对机械合金化合成Ti3SiC2影响。结果表明，机械合金化(球料比10:1，球径10 mm)单质混合粉体7 h后，原料粉体发生化学反应，生成了TiC和Ti3SiC2粉体和块体产物。球料比和球径大小对反应合成Ti3SiC2影响并不显著，但明显影响反应的孕育期。适当增大球径和球料比可明显缩短反应的孕育期，采用较大的磨球或过高的球料比会降低球磨效率，延长孕育期；添加过程控制剂(乙醇)，不但会延长反应的孕育期，而且抑制反应合成Ti3SiC2。

Abstract:

Ti3SiC2 compound was synthesized by mechanical alloying (MA) using the starting materials consisting of 3Ti/Si/2C/0.2Al powder mixtures, and the effects of ball milling parameters (ball milling time, charge ratio, ball size, process control addition and attrition medium) on the MA synthesis of Ti3SiC2 were studied. The results show that, the powders and bulks product containing TiC and Ti3SiC2 were synthesized by chemical reaction between Ti, Si and C mixed powders after milling at ball size of 10 mm and ball-to-powder ratio of 10:1 for 7 h. Appropriate increase of ball size and charge ratio may obviously shorten the incubation period for reaction. However, using over large ball or high rate of ball-to-powder ratio will reduce the milling efficiency to extend incubation period. Adding alcohol as the process control addition (PCA) may not only prolong the incubation period, but also inhibit the synthesis of Ti3SiC2