Abstract: As an important method of material surface modification and life extension of critical components, brazing coating has a broad application in many fields. In order to realize the preparation of high-performance diamond enhanced nickel-based wear-resistant coatings, the diamond/NiCrBSi composite coatings were prepared on the surface of 45 steel by the argon gas-protected brazing coating method in this work. The microstructures, mechanical and wear-resistant properties of composite coatings were investigated. The results show that the diamond/NiCrBSi composite coating is well formed, and there is obvious element diffusion between brazing filler alloy and steel matrix, which realizes good metallurgical bonding. The diamond particles are distributed dispersedly in the coating, and metallurgical reaction occurs between brazing filler alloy and diamond. The C element in the diamond reacts with Cr element in the brazing filler alloy to generate Cr3C2 and Cr7C3. The addition of diamond significantly improves the hardness, impact performance and wear resistance of the composite coating. After addition of 10wt% diamond, the macroscopic hardness of the coating reaches 70.04HRC, which is 50% higher than that of the pure brazing filler coating. The impact toughness of composite coating is 26.72 J/cm2, which is about 1.4 times that of the pure brazing filler coating. Under the same wear conditions, the mass loss of steel matrix is 29 mg, the mass loss of pure brazing filler coating is 11.4 mg, and the mass loss of composite coating is only 2.7 mg, which is about 1/11 of that of steel matrix and 1/4 of that of pure brazing filler coating.
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2025, Vol. 39 
