Wear Properties of Self-Fluxing Ni60A–AlMgB₁₄ Composite Coating Fabricated by Plasma Spraying

Abstract

Recent developments in wear-resistant coating technology offer new opportunities to enhance the service life of cutting tools. The wear properties of self-fluxing Ni–Cr–Mo–Si–B (Ni60A) and Ni60A–AlMgB₁₄ composite coating fabricated by Plasma Spraying were investigated by a ball-on-disc wear tester. The results showed that the average friction coefficient of 5 mass% and 10 mass% AlMgB₁₄ coating were 0.296 and 0.279, respectively. Compared to that of Ni60A coating, these two values decreased approximately 31.5% and 35.4%. The coatings were examined after the tests using SEM and EDS for evidence of wear mechanism and tribo-chemical reactions. The worn surface topographies of coatings indicated that the dominant wear mechanisms were abrasive wear. The low-friction behavior of the Ni60A–AlMgB₁₄ composite coatings was due to the formation of lubricious boric acid.