不同热处理下滑动速度对SiCp/Al复合材料摩擦学性能影响研究

SiCp/Al复合材料非匀质性微观结构使其摩损机制较传统匀质材料更为复杂，不同工况及热处理工艺下复合材料的摩擦学性能也存在差异。以SiCp/2024Al复合材料为研究对象，进行球-面接触干滑动摩擦磨损实验，探究它在不同热处理状态及滑动速率下的摩擦磨损性能及磨损机制。结果表明:热处理对复合材料力学性能和摩擦学性能有显著影响，固溶+人工时效态复合材料具有更高的强度、硬度及耐磨性；滑动速度影响复合材料的表面接触性质及磨损程度，摩擦因数和磨损量随滑动速度提高逐渐增大；随滑动速度增加，复合材料主要磨损机制由剥层磨损向磨粒磨损转变，而磨损机制的转变明显加快了复合材料的磨损，在实际应用中应尽量避免此现象发生。

Effect of Sliding Speed on Tribological Properties of SiCp/Al Composites under Different Heat Treatment Conditions

The microscopic non-homogeneous structure of SiCp/Al composites makes their wear mechanism more complex than that of traditional homogeneous materials, and the tribological properties of the composites vary under different working conditions and heat treatment states. Therefore, a ball-surface contact dry sliding friction wear experiment was conducted on SiCp/2024Al composites to investigate their tribological properties under different heat treatment conditions and sliding rates. The results show that the heat treatment has a significant effect on the mechanical and tribological properties of the composites, and the solid solution + artificial aging state composites have higher strength, hardness and wear resistance;the sliding speed affects the surface contact properties and wear degree of the composites, and the friction coefficient and wear volume increase gradually with the increase of the sliding speed;with the increase of sliding speed, the main wear mechanism of composites changes from delamination wear to abrasive wear, and the change of wear mechanism obviously accelerates the wear of composites, which should be avoided in practical applications.