Preparation method of zirconium boride-zirconium carbide-silicon carbide composite coating

The invention relates to a preparation method of a zirconium boride-zirconium carbide-silicon carbide composite coating. The method comprises the following steps of: 1, preparing zirconium/boron carbide/silicon carbide composite powder or zirconium oxide/boron carbide/aluminum/silicon carbide composite powder; 2, pretreating the surface of a matrix material needing the coating; and 3, spraying thecomposite powder prepared in step 1 on the surface of the matrix material by adopting a thermal spraying method in order to synthesize the zirconium boride-zirconium carbide-silicon carbide compositecoating through an in-situ reaction. The method overcomes the defects of high raw material cost, high process cost, low deposition efficiency, poor coating performance and unsuitability for large-scale industrial production of a direct spraying method. The method also overcomes the defects of poor high temperature oxidation resistance and poor ablation resistance of zirconium boride-zirconium carbide composite coatings pr