不同润滑条件下UHMWPE/GO的摩擦磨损性能研究

The Investigation of Friction and Wear Properties of UHMWPE / GO in Different Lubrication Conditions

采用改进的Hummers法制备出氧化石墨烯(GO),并用热压成型法制备超高摩尔质量聚乙烯(UHMWPE)/GO复合材料,利用UMT-2MT摩擦磨损实验机研究不同润滑条件下复合材料的摩擦磨损性能。结果表明,在干摩擦条件下,纯UHMWPE材料的摩擦因数较低,磨损率和磨痕深度较高;而0.3%GO复合材料的磨损率为1.8×10-5mm3/(N·m),相比纯UHMWPE下降25.0%,磨痕的深度约为5.0μm,相比纯UHMWPE下降了17.6%,说明GO可以改善UHMWPE的摩擦磨损性能,提高UHMWPE的耐磨性。与干摩擦相比,在去离子水润滑和小牛血清润滑条件下的UHMWPE/GO复合材料具有较好的摩擦磨损特性,其中小牛血清润滑条件下复合材料的摩擦磨损性能最佳。

Modified Hummers method was used to prepare graphene oxide （GO） and then ultrahigh molecular weight polyethylene （UHMWPE）/GO composites were prepared by hot compression molding, of which the friction and wear properties were measured by UUMT-2MT tribological tester in different lubrication conditions. The results showed that, in the condition of dry friction, the friction coefficient of pure UHMWPE showed a lower level while the wear rate and wear depth were high. Wear rate and wear depth of the composite with 0. 3% GO were 0. 3% GO were 1.8 × 10^-5 mm^3/（ N·m） and 5.0 μm respectively, which decreased by 25.0% and 17.6% respectively compared to pure UHMWPE. So GO could increase the friction and wear properties of UHMWPE and improve its abrasive resistance. Compared with the condition of dry friction, the UHMWPE/GO composite had better friction and wear properties in deionized water and BSA lubrication conditions, and the UHMWPE/GO composite showed the best tribological properties in BSA lubrication.