High-hardness and high-wear-resistance composite coating applied to surface of valve body, preparation method and valve body

The invention provides a high-hardness and high-wear-resistance composite coating applied to surface of a valve body, a preparation method and the valve body. An Si-doped W N layer or an Si-doped Mo N layer and a multilayer composite coating of WC and a novel high-entropy alloy AlMoCrFeNi are introduced to the surface of the valve body, the advantages of high-temperature ceramic and the high-entropy alloy are combined, the hardness and toughness of the W N layer or the Mo N layer and the high-entropy alloy AlMoCrFeNi are separately enhanced through Si doping and WC particle strengthening, and high hardness and high abrasion resistance are achieved. The coating prepared by the preparation method is compact and uniform in structure, has high hardness, high strength, high toughness, high wear resistance and good corrosion resistance, and is suitable for the surface of the valve body. 本发明提供了一种应用于阀体表面的高硬度、高耐磨复合涂层、制备方法及阀体，在阀体表面引入Si掺杂W2N层或Si掺杂的Mo2N层，以及WC和新型的高熵合金AlMoCrFeNi的多层复合涂层，结合了高温陶瓷与高熵合金的优点，通过Si掺杂和WC的颗粒强化分别增强了W2