Effects of B, Si, Fe, Al and Other Elements in Nickel-Based Alloy Powders

       The nickel-based alloy for thermal spraying is evolved from the Ni80Cr20 superalloy. When the alloy composition content is properly adjusted or B, Si, Fe, Al and other elements are added, it can be used for thermal spraying alloy powder. B and Si elements can not only improve the hardness of the coating, but also reduce the melting point of the alloy and improve the wettability; Cr can improve the oxidation resistance and corrosion resistance of the coating; Fe, C, etc. are beneficial to the hardness and wear resistance of the coating Al can increase the high temperature plasticity of the coating and reduce the shrinkage of the coating. Since Al and Ni can form a dispersed γ' phase (Ni3AI) in the coating, it can also increase the microhardness of the coating. The hardness of the coating sprayed with nickel-based alloy powder can be adjusted in the range of 150~350HBS. Good corrosion resistance and wear resistance, can be used for spraying of shaft parts, bearing surfaces, sealing surfaces and other workpieces.