热喷涂与熔覆技术制备镍基涂层的空蚀性能Cavitation properties of Ni-based coatings deposited by HVAF and plasma cladding technology
王国刚,孙冬柏,王勇,马光,樊自拴,俞宏英,孟惠民
摘要(Abstract):
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。
关键词(KeyWords): 空蚀;镍基涂层;超音速火焰喷涂;直弧等离子冶金熔覆
基金项目(Foundation): 国家“863”计划(2002AA331080);; 北京市重大科技项目(H024200050021)
作者(Author): 王国刚,孙冬柏,王勇,马光,樊自拴,俞宏英,孟惠民
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