电流对Mo2C改性C/C-Cu复合材料载流摩擦磨损性能的影响

通过对炭/炭坯体Mo_2C涂层改性并熔渗Cu制备了Mo_2C改性C/C-Cu复合材料,测试复合材料的载流摩擦磨损性能,研究电流强度对复合材料载流摩擦磨损性能的影响.结果表明电流由0增大至15A时,摩擦系数先减小后增大,5A时达最小值;复合材料体积磨损率逐渐增大;对偶磨损量在0~7.5A范围内较低,然后随电流增大而逐渐增大.电流较低时,磨损机制以磨粒磨损为主,随电流增大氧化磨损及黏着磨损程度提高,电流高至15A时,表现出了较明显的电弧侵蚀作用.

Effect of Electrical Current on Tribological Property of the Mo2C Modified C/C-Cu Composite

Mo₂C modified C/C-Cu composites were fabricated by infiltrating Cu into Mo₂C modified C/C performs. Tribological properties of the composites were tested and the effect of electrical current on tribological properties was studied. The results indicate that the friction coefficient first increased then decreased and reached the minimum value at 5 A with the electrical current increased from 0 to 15 A. Volume wear rate of C/C-Cu composite increased gradually with the increase of current. The wear loss of the counterpart was low in the range of 0~7.5 A and then it increased as current increased. Wear mechanism was mainly abrasive wear under low current. Degree of oxidative wear increased with the increase of current and obvious arc erosion appeared at a current of 15 A.