放电等离子烧结制备Ti3AlC2/Al2O3陶瓷复合材料

摘要

采用Al2O3和Ti3AlC2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Ti3AlC2/Al2O3陶瓷复合材料.结果表明:在1100 ℃制得样品的主要物相为Al2O3、Ti3AlC2和少量的TiC;当Al2O3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Al2O3含量为60wt.%时,在低温1100 ℃制得样品60Al2O3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/cm3,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TiC,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 ℃, Ti3AlC2/Al2O3composites were prepared by SPS with Al2O3and Ti3AlC2as raw materials. The results showed that the main phases of products were Al2O3, Ti3AlC2and small amounts of TiC at 1100 ℃. When Al2O3content was 70-80 wt.%, the micro-structure had large number pores, density of less than 3.60 g/cm3. 60Al2O3that was prepared with 60 wt.% Al2O3at 1100 ℃had dense micro-structure, but there was still a small amount of pores. When 60Al2O3was synthesized at 1200 ℃, the density increased to 4.43 g/cm3, 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 TiC was formed, but small changed in density, hardness up to 11.50 GPa, wear ratio up to 0.6.