(TiB_2+Al_3Ti)/Al-4.5Cu原位复合材料的高温耐磨性能

Wearing Resistance of (TiB_2+Al_3Ti)/Al-4.5Cu In Situ Composites at High Temperature

本文采用混合盐法制备了(TiB2+Al3Ti)/Al4.5Cu原位复合材料,研究了该复合材料在150℃下的干摩擦滑动磨损行为,并与基体合金进行对比。结果表明,载荷在10～20N之间时,(TiB2+Al3Ti)/Al4.5Cu原位复合材料的磨损量低于基体合金,但并不明显;随载荷的增加(特别是当载荷超过30N之后),复合材料的磨损量仍低于基体合金,且复合材料的磨损量增大的速度小于基体合金磨损量的增长速度。(TiB2+Al3Ti)/Al4.5Cu原位复合材料同45钢对磨时的主要磨损机制为粘着磨损和磨粒磨损。随着原位反应体系中混合盐含量的增加,复合材料的耐磨性能提高,并逐渐由粘着磨损向磨粒磨损过渡。

In-situ composites of (TiB2+Al3Ti)/Al-4.5Cu were fabricated via mixed salts reaction in Al-4.5Cu alloy melt. The dry sliding wear behavior of (TiB2+Al3Ti)/Al-4.5Cu at 150°C was studied and compared with that of the matrix. The results show that when load is between 10 N to 20 N, wear of the composites is less than that of the matrix, but this discrepancy is small. With increased load (especially when load exceeds 30 N), wear of the composites is still less than that of the matrix; the wear of the matrix is increased more rapidly than the composite. Against 45% carbon steel the wear of the in situ composites is characterized by adhesive wear and abrasive wear. With increased mixed salts in the in situ reaction system, wear resistance of the composites is enhanced, moreover, their wear mechanism is changed from adhesive wear to abrasive wear.