RESEARCH ON SKH51+WC+B83 COMPOSITE GRADIENT COATING BY ESD METHOD

With the development of the electro-spark deposition (ESD) process, researchers have conducted a lot of studies on single-coated materials. On the base of researches, people began to conduct research on composite coatings to meet the multiple functional requirements. This article mainly studied the composite coating SKH51+WC+B83, and studied the surface characteristics of each deposited layer. Composite coatings can improve the wear resistance, corrosion resistance, and reduce friction of the coating. Composite coating can increase coating thickness and extends coating service life. Composite coating outer coating mainly selected wear-resistant materials which included metal ceramics, intermetallic compounds and high entropy alloys. The intermediate layer was mainly nickel material, which plays the role of connecting the wear-resistant layer. This research used the idea of gradient structure to select the iron alloy material SKH51, which had good adhesion, wear resistance and impact toughness, and plays the role of transition coating. The WC-10Co deposition material was used to further improve the wear resistance of the coating. Babbitt B83 material was used for deposition to further reduce the friction of the coating to achieve the anti-friction function. It has better corrosion resistance than WC coating. The composite coating SKH51+WC+B83 has good properties, which can meet the requirements of remanufacturing engineering for super-life surface, upgrade the coating performance, and make the mechanical parts perform better than the original surface.