Ti3SiC2-SiC复合材料的耐磨擦磨损性能

以商用硅粉、碳粉、钛粉以及少量的铝粉为原料, 利用放电等离子烧结技术原位反应制备了Ti₃SiC₂-SiC复合材料. 利用盘销式摩擦磨损实验机测试了Ti₃SiC₂-SiC复合材料的耐摩擦磨损性能. 结果表明: 随着SiC含量的增加, 材料相对于硬化钢的摩擦系数和磨损系数均呈下降趋势, 这表明SiC的引入提高了复合材料的抗摩擦磨损性能. Ti₃SiC₂单相材料摩擦系数在0.8～1.0之间, 而Ti₃SiC₂-40vol% SiC复合材料在稳态下的摩擦系数达到了0.5, Ti₃SiC₂-40vol% SiC复合材料相对于Ti₃SiC₂单相材料的磨损系数下降了一个数量级. Ti₃SiC₂-SiC复合材料的高抗磨损性归因于磨损类型的改变以及SiC良好的抗氧化性能.

Friction and Wear Resistance of Ti3SiC2-SiC Composites

Ti₃SiC₂-SiC composites were in situ fabricated by spark plasma sintering technique from the raw powders of Ti, Si, C and small amounts of Al. Pin-disk friction and wear tests were conducted on Ti₃SiC₂-SiC composites. Testing results indicate that the friction coefficients and wear rates decrease with the increasing SiC contents for the Ti₃SiC₂-SiC composites against hardened steel, which indicates that the addition of SiC improves the friction and wear resistance of Ti₃SiC₂-SiC composites. The friction coefficient of Ti₃SiC₂ is a relatively stable value ranging from 0.8 to 1.0, while that of Ti₃SiC₂-40vol% SiC composites displays minimum value of 0.5 at stable state. The wear rates decrease one order of magnitude for Ti₃SiC₂-40vol% SiC compared with monolithic Ti₃SiC₂. The improvement of the wear resistance of Ti₃SiC₂-SiC composites is due to the wear mechanism transition and good anti-oxidation of SiC.