放电等离子烧结制备金刚石/钛铝碳复合材料

Diamond/Ti_3AlC_2 Composite Prepared by Spark Plasma Sintering

以金刚石微粉和钛铝碳微粉为原料,采用放电等离子烧结制备金刚石/钛铝碳陶瓷复合材料。研究结果表明:在温度1100℃~1200℃、30 MPa和金刚石含量为(30~60)wt.%条件下,制得金刚石/钛铝碳陶瓷复合材料。当金刚石含量大于40wt%时,制得样品的微观结构中存在大量的空隙;当金刚石含量为(30~40)wt.%时,制得样品微观结构较致密。钛铝碳与金刚石作用分解为碳化钛和少量的碳化铝,金刚石能够被反应产物表面包覆,包覆后镶嵌于陶瓷基体中,复合材料密度达到3.7g/cm3,磨耗比约为1550。

Diamond/Ti3AlC2 ceramic composite has been prepared through spark plasma sintering with diamond and Ti3AlC2 micro-powders as raw materials. Result shows that iamond/Ti3AlC2 ceramic composite can be prepared under the conditions of 1100℃-1200 ℃, 30 Mpa and （30-60） wt. % diamond content. When the diamond content is higher than 40wt %, abundant voids occur in the microstructure of the prepared samples; the microstructure of the prepared samples are relatively denser when diamond content is （30-40） wt. %. Ti3AlC2 decomposes into TiC and a small amount Al4C3 under the reac- tion with diamond and diamond is coated by the reaction product and inlaid into the ce- ramic matrix, and the density of the composite may reach 3.7g/cm3 with a abrasive ratio of 1550.