铜铝聚苯酯涂层的制备及高温耐磨性能研究

Preparation and High-temperature Wear Resistance of Aluminum Bronze Polyester Coating

采用团聚复合工艺制备铜铝聚苯酯复合粉末,采用大气等离子喷涂工艺制备铜铝聚苯酯涂层,并对涂层开展了600℃下长达1000 h的等温氧化试验,表征了涂层的相结构、微观组织、孔隙率、高温硬度及摩擦磨损性能。结果表明,喷涂态涂层中聚苯酯及孔隙分布均匀;涂层的相组成主要是α相和β’相,涂层表现出优异的抗氧化性能;孔隙率越高,硬度越低。磨损2 min基本达到稳定磨损阶段,氧化5 h~100 h涂层的摩擦系数在0.8~1.1,体积磨损率在0.00116~0.00199 mm^(3)·N^(-1)·m^(-1);氧化500 h和1000 h涂层的摩擦系数分别为1.0和0.7,体积磨损率分别为8.42×10^(-4)mm^(3)·N^(-1)·m^(-1)和7.78×10^(-4)mm^(3)·N^(-1)·m^(-1),长时间氧化形成的氧化膜起到了减磨润滑作用。氧化5~100 h涂层的磨损机制是磨粒磨损和疲劳磨损;氧化500 h、1000 h涂层的磨损机制是磨粒磨损、氧化磨损和疲劳磨损。

Aluminum bronze polyester composite powder was prepared by agglomeration composite process,and aluminum bronze polyester coating was prepared by atmospheric plasma spraying process,and an isothermal oxidation experiment was conducted at 600℃for 1000 h to characterize the phase structure,microstructure,porosity,high-temperature hardness,and friction and wear performance of the coating.The results show that the distribution of polyester and pores in the sprayed coating is uniform.The phase composition of the coating is mainlyαandβ'Phase,the coating exhibits excellent antioxidant performance.The higher the porosity,the lower the hardness.After 2 minutes of wear,it basically reached a stable wear stage.The friction coefficient of the coating was between 0.8 and 1.1 after oxidation for 5 to 100 hours,and the volumetric wear rate was between 0.00116 and 0.00199 mm^(3)·N^(-1)·m^(-1).The friction coefficients of the coatings after oxidation for 500 h and 1000 h are 1.0 and 0.7 respectively,and the volumetric wear rates are 8.42×10^(-4)mm^(3)·N^(-1)·m^(-1) and 7.78×10^(-4)mm^(3)·N^(-1)·m^(-1),the oxide film under long-term oxidation plays a role in reducing wear and lubrication.The wear mechanism of the coating after oxidation for 5 to 100 hours is abrasive wear and fatigue wear.The wear mechanisms of coatings oxidized for 500 h and 1000 h are abrasive wear,oxidation wear,and fatigue wear.