C/C-Cu复合材料的摩擦磨损行为

Tribological behavior of C/C-Cu composites

采用无压熔渗方法制备1种新型的C/C-Cu复合材料,研究该材料与紫铜对偶在干摩擦往复运动条件下的磨损行为,系统考察载荷30～70 N和速度0.25～1.0 m/s范围内摩擦副材料的磨损性能;通过对磨损表面及磨屑的显微分析,建立C/C-Cu复合材料的磨损机制转变图。结果表明:在选定的试验条件下,根据C/C-Cu复合材料的磨损程度,可将磨损图划分为轻微磨损区和严重磨损区。在轻微磨损区,低载荷下的主要磨损机制为磨粒磨损和氧化磨损;在较高载荷下,磨损主要由磨屑膜的脱落引起;在严重磨损区,复合材料的磨损机制为剥落磨损。

A novel C/C-Cu composite with excellent wear resistance was fabricated by pressureless infiltration.The tribological behavior of the composite was evaluated using UMT-3 tester.The wear rate was measured within a load of 30~70 N and a sliding velocity range of 0.25～1.0 m/s;based on the morphologies and composition of worn surface and wear debris,a wear map varied with load and speed was constructed.Under the experimental conditions selected by the authors,two main wear regimes,namely a mild wear regime and a severe wear regime were observed.In the mild regime,the wear mechanism is of abrasive wear combined oxidation wear under low load conditions,and flaking of debris layer is responsible for surface damage under higher load conditions.In the severe regine,wear mechanism of C/C-Cu composites is exfoliation wear.