Ti_2SiC_2/Cu纳米复合材料的制备与微观组织

Preparation and Microstructure of Ti_2 SiC_2/Cu Nano-composite

研究了用微米级Ti2SiC2陶瓷与Cu制备纳米复合材料的工艺过程。分别选用钢球和玛瑙球进行球磨,对Ti2SiC2颗粒的细化和在Cu中分散性的影响进行了研究。结果表明,在其它实验参数相同的情况下,用两种不同材质的磨球所获得的混合粉形态有很大差异,用玛瑙磨球可以更好地使Ti2SiC2颗粒细化并均匀分散在Cu基体中,而用钢球则易产生混合粉的团聚。另外,随着球磨时间的延长,Ti2SiC2先后经历了颗粒细化、均匀镶嵌在基体中两个阶段。对球磨后的混合粉在850℃及20MPa的压力下成功地制备了组织成分均匀的大块纳米复合材料,其力学性能与同成分的普通复合材料相比有明显提高。

Ti2SiC2/Cu nano-composite was prepared by using powder metallurgy method. Steel ball and agate ball were selected during the ball-milling process and the effect of different balls on homogeneous distributing of micro-sized Ti2SiC2 particle in Cu matrix was investigated. The results show that the conformation of mixture has a significant difference for these two sorts of ball. The homogenous fine mixed powder will be obtained for agate ball, whereas the conglomeration will be formed for steel ball. Moreover, the particle size of Ti2SiC2 will be decreased to about 50 nm and described homogenous in copper powder with the increase of milling time. Bulk homogeneous Ti2SiC2/Cu nano-composite is synthesized by hot-pressing the mixed powder under a pressure of 20MPa at 850℃. The Ti2SiC2/Cu nano-composite has a significant improve than popular Ti2SiC2/Cu composite in mechanical property.