Gr-PA66-POB复合涂层的制备及其摩擦学性能

Preparation and tribological properties of the Gr-PA66-POB composite coatings

采用氧化-分散-还原法制备十八胺修饰的石墨烯(graphene,Gr),再以烧结法成功制备石墨烯(Gr)-聚酰胺(polyamide66,PA66)-聚苯酯(polyoxybenzoate,POB)复合固体润滑涂层,并通过环块磨损实验考察了该复合涂层的摩擦学性能.结果表明:1)Gr-PA66-POB的耐磨寿命显著高于PA66-POB涂层,当w(Gr)=25%时,其耐磨性能最佳,磨损率比不添加Gr时低31%;2)不同w(Gr)下复合涂层的失效模式:w(Gr)≤15%时,以黏着磨损和犁沟磨损为主;w(Gr)=20%时,以塑性变形和犁沟磨损为主;w(Gr)=25%时,表现为轻微的犁沟磨损;w(Gr)=30%时,主要表现为疲劳磨损.

Octadecylamine-modified graphene （Gr） is prepared by an oxidation-dispersion-reduction process and fabricated composite coatings of polyoxybenzoate Gr-polyamide （PA66）-POB are obtained through a sintering process. The tribological properties of the composite coatings are investigated by the ring on block wear test on a MRH-3 machine. The results show that the abra- sion resistance of the composite coatings is significantly better than the POB-PA66 coating. The optimum mass fraction of graphene in composite is 25 %. The wear rate of Gr-PA66-POB including 25% Gr is 31% lower than that of POB-PA66 coating. The main failure mode is adhesive and plou- ghing wear while the Gr content is less than 15~. When the coating Gr content is 20%, the failure mode is slight plastic deformation and ploughing wear. When the Gr content is 25%, the failure mode is mainly slight furrow. However, while the mass fraction of Gr in the composite coating is 30%, fatigue wear is the main failure mode.