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通过机械合金化在室温下于304不锈钢表面成功制得Al-Al2O3-ZrO2-Y2O3复合涂层。通过相关实验分析了复合涂层的组织形貌、显微硬度及高温氧化性能。结果表明:随着球磨时间的增加,涂层厚度先增加后减小;当球磨时间为8h时,涂层最为致密,平均厚度约为200μm;当球磨时间为14h时,涂层部分剥落,涂层厚度减小。涂层的显微硬度明显高于基体,且从表层到基体呈梯度下降,最高显微硬度值达HV0.1525,为基体硬度的2倍多。Al-Al2O3-ZrO2-Y2O3复合涂层的抗高温氧化性能良好。
The Al-Al2O3-ZrO2-Y2O3 composite coating was successfully prepared on the surface of 304 stainless steel by mechanical alloying at room temperature. Through the relevant experiments, the microstructure, microhardness and high temperature oxidation properties of the composite coatings were analyzed. The results show that the coating thickness first increases and then decreases with the ball milling time increasing. When the ball milling time is 8h, the coating is the most compact with an average thickness of about 200μm. When the ball milling time is 14h, the coating partially peels off, Layer thickness decreases. The microhardness of the coating is obviously higher than that of the matrix, and the gradient of the coating decreases from the surface to the matrix. The highest microhardness reaches HV0.1525, which is more than twice that of the matrix. Al-Al2O3-ZrO2-Y2O3 composite coatings have good high temperature oxidation resistance.