Ti_3SiC_2/Cu摩擦副的载流摩擦学性能

Tribological Characteristics of Ti_3SiC_2/Cu Tribo-pair in Sliding Electrical Contact

本文中考察了Ti3SiC2/Cu摩擦副在干摩擦和微量离子液体润滑条件下的载流摩擦学特性.在干摩擦条件下,Ti3SiC2/Cu摩擦副的摩擦系数值为0.6~0.75.当滑动速度从0.11增至0.33 m/s时,接触电阻降低小,在Ti3SiC2栓磨损表面有Cu的转移膜形成.当滑动速度为0.44和0.56 m/s时,栓/盘接触不稳定并且产生电火花,表明在机械磨损和电磨损共同作用下Ti3SiC2栓发生了严重磨损.在微量离子液体润滑条件下,Ti3SiC2/Cu摩擦副处于边界润滑状态,随着滑动速度的提高,摩擦系数由0.08增至0.2.当滑动速度高于0.33 m/s时,产生长约数厘米、平均直径53μm的弯曲缠绕的铜丝,这是相对较硬的Ti3SiC2对Cu盘犁削作用的结果.铜丝将离子液体'扫离'了摩擦表面,并且对摩擦学性能和电性能造成不利影响.

The tribological characteristics and contact resistance of Ti3 SiC 2/ Cu tribo- pair in sliding electrical contact were investigated under dry sliding in air and lubrication of ion liquid LP106. Under dry sliding,friction coefficient was as high as0. 6 at a sliding speed of 0. 11 m / s. Increasing sliding speed up to 0. 33 m / s increased the friction coefficient but reduced the contact resistance. In addition,transfer film of Cu was observed on the worn surface of Ti3 SiC 2pin. Instability of contact and electric sparking at sliding speeds of 0. 44 and 0. 56 m / s indicated severe wear in forms of mechanical and electrical wear and their synergetic effect. Under lubrication of minimal quantity( 15 μL) of LP106,the lubrication regime was boundary lubrication,friction coefficient was as low as 0. 08 at 0. 11 m / s and increased to 0. 12 at 0. 22 m / s and 0. 2 at 0. 56 m / s. At speed higher than 0. 33 m / s,ploughing of Cu disk by hard asperities on Ti3 SiC 2pin resulted in the formation of long and curly Cu wire with an average diameter of 53 μm and lengths up to several centimeters. The presence of Cu wire swept a small amount of ion liquid out of the frictional surface and had detrimental effects on tribological and electrical properties.