锡对铸造铝-石墨颗粒复合材料摩擦性能的影响

Influence of Stannum on Tribological Behavior of Cast Aluminum-Graphite Particle Composites

采用M-200摩擦磨损试验机,对加入固体润滑剂锡的铸造铝-3%石墨颗粒复合材料的摩擦性能进行试验研究,研究表明:锡和石墨具有优越的协同润滑效应,加锡可极大提高铝-石墨颗粒复合材料的减摩性能,使有润滑的摩擦系数达到0.004～0.005。同时锡和石墨的协同润滑作用存在最佳配合,在本试验条件下,加约7%的锡时,协同润滑效应最佳。加锡不能改善干摩擦时铝-3%石墨颗粒复合材料的耐磨性,但能极大提高有润滑时复合材料的耐磨性。并对加锡的铝-石墨颗粒复合材料的磨损机理进行了初步研究,其在干摩擦时的磨损机理为粘着迁移、粘着磨损和磨料磨损,在半干摩擦时的磨损机理为疲劳磨损和磨料磨损。

The tribological behavior of aluminum-3%graphite solid lubricant stannum was investigated on M-200 friction and particle composites with addition of wear tester. The results showed that stannum and graphite are of excellent cooperating lubrication effect. The anti-friction ability of the composites can be greatly enhanced by adding stannum and the friction coefficient in lubricating sliding wear reaches 0.004-0.005. At the same time, the cooperating lubrication effect of stannum and graphite has an optimum range of content. When stannum content is approximately 7%, the cooperating lubrication effect is the best in this test. Wear resistance of the composites added with stannum can not be improved in dry sliding, but can be greatly improved in lubricating sliding. The wear mechanisms of aluminum-3% graphite particle composites added with stannum were also preliminary investigated. They are mainly adhesive transfer, adhesive wear and abrasive wear in dry sliding and surface fatigue and abrasive wear in damp dry sliding.