利用热喷涂和等离子熔覆技术分别制备了镍基涂层,采用SEM、X射线衍射、显微硬度、失重分析法对空蚀前后的涂层进行了对比研究,并在旋转圆盘空蚀实验机上进行了空蚀实验.SEM结果表明,等离子熔覆涂层与基体结合为冶金结合,内部组织致密,缺陷少;热喷涂涂层由堆积的变形粒子组成,与基体多为机械结合,涂层具有层状叠加组织结构,其中孔隙较多.Ni基熔覆涂层表现出较好的耐空蚀性能,其失重量与对比不锈钢接近.X射线衍射分析空蚀后的熔覆涂层表面物相发生了变化,空蚀前后的熔覆涂层截面硬度表明,镍基涂层的在空蚀过程中出现了加工软化.热喷涂涂层由于内部结合力较低,特别容易被空蚀微射流或冲击波过程所破坏.
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