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采用磁控溅射法成功制备Al2O3/Au层状复合纳米涂层,所制备的涂层结构致密且由Al2O3层和Au层交替组成。采用高温循环氧化实验对复合涂层在不锈钢基体上的高温抗氧化性能进行分析评价。结果表明:Al2O3/Au层状复合纳米涂层极大地改善不锈钢基体的抗氧化和抗剥落性能。其抗氧化机理与涂层能够有效地抑制氧向合金基体的扩散并促进不锈钢基体中Cr元素的选择性氧化有关;抗剥落机理可归因于复合涂层中的Au层和纳米结构的Al2O3层能够有效地松弛高温热循环过程中产生的热应力,从而提高涂层的抗剥落性能。
The Al2O3 / Au layered composite nano-coating was successfully prepared by magnetron sputtering. The prepared coating was compact and consisted of Al2O3 and Au alternately. The high temperature oxidation resistance test was used to evaluate the high temperature oxidation resistance of composite coatings on stainless steel substrate. The results show that the Al2O3 / Au layered composite nano-coating greatly improves the oxidation resistance and anti-spalling properties of the stainless steel matrix. Its anti-oxidation mechanism and coating can effectively inhibit the diffusion of oxygen to the matrix of the alloy and promote the selective oxidation of Cr in the stainless steel matrix. The anti-spalling mechanism can be attributed to the Au layer in the composite coating and the Al2O3 layer in nanostructures Can effectively relax the thermal stress generated during the high temperature thermal cycling, thereby enhancing the anti-spalling performance of the coating.