TIC/7075铝基复合材料的磨损实验研究

摘要

The TiC reinforced 7075 Al matrix composites have been fabricated by melt in situ reaction spray deposition. The microstructures of spray-deposited alloys were studied using SEM and TEM.The dry sliding wear behavior of the alloys was investigated using a pin-on-disc machine under four loads, namely 8.9, 17.8, 26.7 and 35.6N. It has been found that the wear behavior of the alloys was dependent on the TiC content in microstructure and applied load. At lower load (8.9N), with increasing TiC content, the wear rate of the alloy was decreased. At higher loads (26.7, 35.6N), spray-deposited 7075 Al alloy exhibited superior wear resistance to the TiC/7075 composites.%采用原位反应喷射沉积法制备TiC/7075铝基复合材料,并在销一盘式磨损机损上进行摩擦磨损实验研究.通过TEM观察原位TiC颗粒的分布与形貌,并利用SEM观察沉积态组织磨损表面形貌.结果表明:复合材料的耐磨性和TiC颗粒含量及载荷有关,在低载荷(8.9N)状态下,材料的耐磨性随TiC颗粒含量的增加而增强,在高载荷(26.7,35.6N)状态下,材料的耐磨性随TiC颗粒含量的增加而减小.