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利用大气等离子喷涂技术(APS)在Q235钢基体上制备微米级Al_2O_3-13%TiO_2涂层,研究不同电流下涂层组织形貌、成分、显微硬度、冲蚀性能。研究表明,电流在400A时涂层组织形貌较好,无明显裂纹,显微硬度达1 376 HV。电流增加或者减小都会降低涂层的显微硬度,且电流过高涂层裂纹增多。涂层以30°冲蚀角时主要表现为切削磨损,增加冲蚀角度冲蚀磨损会增大,脆性断裂现象会更明显。冲蚀角度为90°时冲蚀量最大,主要表现为脆性断裂。
The microstructure of Al 2 O 3 - 13% TiO 2 coating on Q235 steel substrate was prepared by atmospheric plasma spraying (APS) technique. The microstructure, microhardness and erosion resistance of the coating were studied under different current conditions. The results show that the microstructure of the coating is better at current of 400A with no obvious crack and the microhardness reaches 1 376 HV. Increasing or decreasing the current will decrease the microhardness of the coating, and the overcurrent of the coating increases the crack of the coating. When the coating is eroded at an angle of 30 °, it is mainly shown as cutting wear. Increasing the erosion angle will increase the erosion wear, and the brittle fracture will be more obvious. When the erosion angle is 90 °, the erosion amount is the largest, mainly as brittle fracture.