常压等离子喷涂Cr_2O_3涂层摩擦磨损性能的研究

Investigation on the wear behavior of air plasma sprayed Cr_2O_3 coatings

测试了在室温、干磨擦及不同载荷和转速的条件下,Cr2O3涂层相对于GCr15不锈钢的摩擦磨损性能.结果表明,随着载荷或转速的增加,Cr2O3涂层磨损量均呈指数增加趋势;摩擦系数随载荷的增加先增后减,随转速的增大而减小.对磨痕的显微形貌观察和能谱分析表明,Cr2O3涂层的磨损机理为微观脆性断裂剥落和粘着磨损的共同作用.

The dry wear behavior of air plasma sprayed Cr2 O3 coatings against GCr15 steel was investigated using a pin-on-disk tribometer at room temperature. Experimental results showed that the weight loss amount of Cr2O3 coatings increased exponentially with the increase of loads and rotation speed. The friction coefficient of the Cr2O3 coatings increased first and then decreased with increasing loads, but it decreased with increasing rotation speed. The wear scars were then examined by scanning electron microsope （SEM） and energy dispersive spectroscopy （EDS）. It was found that the wear mechanisms of Cr2 O3 coatings were governed by micro brittle fracture and adhesion wear.