摩擦热驱动界面纳米铜的生成及其减摩特性研究

Study on the Generation of Nano-Copper Induced by Friction Heat Effect and Its Anti-Wearing and Friction Properties

摩擦热通常会伴随摩擦副表层结构的摩擦化学效应、局部熔融或胶合、甚至形变和裂纹等发生,给摩擦副服役带来极为不利的影响。拟借助摩擦过程中的摩擦热效应来驱动润滑介质热解原位产生纳米铜,来实现对摩擦副表面磨损的原位修复。在UMT-3多功能摩擦磨损试验机上以甲酸铜-辛胺配合物前驱体为润滑环境,以316L不锈钢为对磨副,进行往复摩擦磨损试验。随后,利用SEM、EDX、表面轮廓仪、XRD等研究了纳米铜的生成及其减摩特性。研究结果表明:在上述试验环境下316L不锈钢配副表面在摩擦过程中产生纳米铜,能有效减缓摩擦副间的摩擦剪切作用,大大提高了摩擦副的抗磨损性能;经摩擦热驱动实现纳米铜原位修复的磨损表面深度可降低50%,摩擦副表面材料去除量仅为未经修复时的1/3。因此,通过摩擦副表面摩擦热的合理利用,可以将摩擦热对摩擦过程的不利影响转变为有利的磨损修复基础条件,实现摩擦热驱动下的磨损表面原位修复。

When friction heat occurs,it is usually accompanied by tribochemical effect,local melting or metallurgical bonding,and even the deformation and cracking between tribo-pairs.It is common that friction can be reduced while the wear is aggravated,which has a negative impact on tribo-pairs.Induced by friction heat effect,the nano-copper was produced by pyrolysis reactor of complex as a lubricant in the friction process,which could repair in-situ the surface of tribo-pairs.In this paper,the complexes composed of copper formate and octylamine were used as the precursor,and the tribological behavior of 316 L stainless steel was carried out in the precursor lubricated environment on UMT-3 multifunctional friction and wear tester.Subsequently,the production process and anti-friction characteristics of nano-copper were suited by SEM,EDX,profilometer and XRD etc.Results showed that under the above test conditions,the generated nano-copper induced by friction heat effect could effectively reduce the friction shear action and greatly improve the anti-wear performance of tribo-pairs.The depth of worn surface repaired by nano copper were reduced by 50%,and the removal content of surface material was only 1/3,compared with unrepaired.Therefore,through the reasonable utilization of the frictional heat,the adverse effect of the friction heat on the friction process could be transformed into a favorable worn-repairing condition,and achieved the in-situ repair of worn surface which induced by friction heat.