放电等离子烧结制备Ti_3AlC_2/Al_2O_3陶瓷复合材料

Ti_3AlC_2/Al_2O_3 Composites Prepared by Spark Plasma Sintering

采用Al_2O_3和Ti_3AlC_2微粉为原料,在1100-1400℃条件下,利用放电等离子烧结技术(SPS)制备Ti_3AlC_2/Al_2O_3陶瓷复合材料。结果表明:在1100℃制得样品的主要物相为Al_2O_3、Ti_3AlC_2和少量的Ti C;当Al_2O_3含量为70-80wt.%时,在1100℃制得样品的微观形貌中存在大量气孔,密度低于3.60 g/cm3;当Al_2O_3含量为60wt.%时,在低温1100℃制得样品60Al_2O_3微观形貌致密,但存在少量的气孔;提高烧结温度为1200℃时,制得样品的微观形貌致密且气孔消失,密度达到4.43 g/cm^3,硬度为0.93 GPa,磨耗比为0.3;提高温度为1300-1400℃时,生成大量的Ti C,密度变化小,硬度高达11.50 GPa,磨耗比约为0.6。

At temperature from 1000 to 1400 ℃, Ti_3AlC_2/Al_2O_3 composites were prepared by SPS with Al_2O_3 and Ti_3AlC_2 as raw materials. The results showed that the main phases of products were Al_2O_3, Ti_3AlC_2 and small amounts of Ti C at 1100 ℃. When Al_2O_3 content was 70-80 wt.%, the micro-structure had large number pores, density of less than 3.60 g/cm3. 60 Al_2O_3 that was prepared with 60 wt.% Al_2O_3 at 1100 ℃had dense micro-structure, but there was still a small amount of pores. When 60 Al_2O_3 was synthesized at 1200 ℃, the density increased to 4.43 g/cm^3, the pores disappeared, hardness up to 0.93 GPa and wear ratio up to 0.3. When the temperature was increased to 1300-1400 ℃, amount of Ti C was formed, but small changed in density, hardness up to 11.50 GPa, wear ratio up to 0.6.