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利用冷喷涂技术制备Cu-20%(质量分数)Al2O3复合涂层,并在氩气保护气氛下对该复合涂层进行300℃、500℃和700℃退火热处理。采用常温干摩擦试验评价热处理对冷喷涂Cu-20%(质量分数)Al2O3复合涂层耐磨损性能的影响,并利用扫描电镜(SEM)观察涂层表面磨痕形貌。结果表明,复合涂层经退火热处理后发生了再结晶现象,涂层显微硬度降低。冷喷涂态和退火态复合涂层磨损机制不同:冷喷涂态复合涂层和低温退火热处理(300℃和500℃)下复合涂层磨损主要为磨粒磨损,700℃退火态复合涂层主要表现为疲劳磨损。
Cu-20% (mass fraction) Al2O3 composite coating was prepared by cold spraying technique and the composite coating was annealed at 300 ℃, 500 ℃ and 700 ℃ in an argon gas atmosphere. The effect of heat treatment on the wear resistance of cold-spray Cu-20% (mass fraction) Al2O3 composite coating was evaluated by dry friction test at room temperature. The morphology of wear scar was observed by scanning electron microscopy (SEM). The results show that the recrystallization of the composite coating occurs after annealing and the microhardness of the coating decreases. The wear mechanisms of cold sprayed coating and annealed composite coating are different. The wear of the composite coating is mainly abrasive wear when cold sprayed composite coating and low temperature annealed heat treatment (300 ℃ and 500 ℃), and the main properties of annealed composite coating at 700 ℃ Wear for fatigue.