Sialon陶瓷复合材料高温磨损特性的试验研究

Experimental Study on the Wear Properties of Sialon Ceramic Composites at High Temperature

采用自制的盘销式感应加热磨损试验研究了高温条件下Sialon陶瓷复合材料摩擦磨损特性,优化出了一种具有较好高温抗磨性的Sialon陶瓷材料成分和制备工艺方法。结果表明:当载荷为20 N,旋转速度为360 r/min时,高温磨损机制以氧化磨损和粘着磨损为主,在磨损表层出现白亮层,表明此时因摩擦热和外加热源的联合作用已使磨损表层重结晶并形成氧化物屑。随着温度的提高,失重量和摩擦系数都下降。同时得到了耐磨性最优的Sialon陶瓷复合材料,烧结工艺为1900℃,BN的加入量为5wt.%。

The friction and wear properties of Sialon ceramic composite materials at high temperature were researched with a self-designed high temperature pin-on-disk tester heated by middle frequency induction, and then the composition and the preparation method of a Sialon ceramic material with better high temperature wear resistance were optimized. The results show that when the load was 20 N and the pin-ondisk circumrotating speed was 360r/min, the main wear mechanisms at high temperature were mainly oxidation wear and adherence abrasive wear, the combined effect of the friction heat and the external heat source on the wear surface engendered the recrystallization and oxide debris, which led to a white layer on the wear surface. The wear loss and coefficient of friction decreased with temperature increasing. A Sialon ceramic composite material with optimal wear resistance was obtained, when the sintering temperature was 1900 °C and the added amount of BN was 5wt.%.