采用MoS2润滑颗粒提高搅拌摩擦制备A413/SiCp表面复合材料的摩擦性能

摘要

研究MoS2润滑颗粒对搅拌摩擦制备A413/SiCp表面复合材料显微组织、显微硬度和摩擦性能的影响.在模具转速为1600 r/min,模具行进速率为25 mm/min,模具倾角为3°条件下进行单道次摩擦搅拌.采用光学显微镜、电子扫描显微镜、显微硬度和往复磨损实验对材料进行表征.结果表明,在A413/SiCp表面复合材料中添加MoS2润滑颗粒可减小摩擦因数和质量损失.在A413/SiCp/MoS2p表面复合材料中,可形成含MoS2润滑颗粒的机械混合层,使金属与金属间的接触减小,进而提高材料的摩擦性能.%The effect of MoS2 lubricant particles on the microstructure, microhardness and tribological behavior of A413/SiCp surface composite, fabricated via friction stir processing (FSP), was studied. For this purpose, the FSP was carried out with tool rotational speed of 1600 r/min, tool travel speed of 25 mm/min and tool tilt angle of 3° through only a "single pass". The optical and scanning electron microscopies, microhardness and reciprocating wear tests were used to characterize the samples. The results showed that the addition of MoS2 lubricant particles to A413/SiCp surface composite leads to the decrease of friction coefficient and mass loss. In fact, the generation of mechanically mixed layer (MML) containing MoS2 lubricant particles in A413/SiCp/MoS2p surface hybrid composite results in the reduction of metal-to-metal contact and subsequently leads to the improvement of tribological behavior.