黏结石墨基固体润滑涂层在油介质中的摩擦学性能

Tribological Properties of Bonded Graphite Solid Lubricating Coating in Different Oils

为了探讨聚酰亚胺黏结石墨基固体润滑涂层在油介质中的摩擦学性能及其作用机制,采用MHK-500型摩擦磨损实验机对聚酰亚胺黏结石墨基固体润滑涂层在4种油介质(RP-3煤油、0#柴油、液体石蜡和SG 15W-40机油)中的摩擦磨损性能进行评价,并对其机制进行初步的探讨。结果表明:与干摩擦相比,涂层在4种油介质中的摩擦学性能都有显著提高,其中在柴油介质中涂层的抗磨性能提高最为突出,可能的原因是中等黏度的柴油介质在摩擦界面能形成足够厚的油膜,又能对涂层进行有效的冷却;同种油介质中,涂层在高速(2.56 m/s)、低载(1 120 N)下的耐磨性能明显优于低速(1.54 m/s)、高载(2 120 N)下的耐磨性能。

In order to inquire into tribological properties and mechanism of polyimide bonded graphite solid lubricating coating in oils, the friction and wear behaviors of polyimide bonded graphite solid lubricating coating in different oils （ ker- osene RP-3, diesel fuel 0#, paraffin liquid and lubrication oil SG 15W- 40） were investigated by MHK-500 friction-wear tester. The friction and wear mechanism of the coating in four oils was discussed. The results show that the anti-friction and wear-resistant properties of the coating are greatly improved in oils, especially in diesel fuel, the wear-resistant properties of the coating is the best. The main reason may be that diesel fuel with moderate viscosity can supply enough oil film thickness between the frictional surfaces and effectually make the coating get the cooling to a large extent. The coating at low applied load （1 120 N） and high sliding speed （2. 56 m/s） in oils exhibits more outstanding wear-resistant properties than at high applied load （2 120 N） and low sliding speed （1.54 m/s）.