Wear-Resistant Fe-Based Metallic Glass-Al2O3 Composite Coatings Produced by Detonation Spraying.

Al₂O₃ particle-modified Fe₆₆Cr₁₀Nb₅B₁₉ metallic glass matrix coatings were deposited on carbon steel substrates by detonation spraying of the corresponding powder mixtures. The microstructure, mechanical and tribological properties of the coatings were investigated. In the microstructure of the coatings, the Al₂O₃ particles were located between the layers of the Fe₆₆Cr₁₀Nb₅B₁₉ amorphous alloy. The bonding strength between the substrate and composite coatings was ~ 130 MPa. The wear behavior of the coatings was studied under dry linearly reciprocating conditions in a ball-on-flat mode using a WC-6Co ball as a counterbody. It was found that the friction coefficients of the Al₂O₃-free coating and composite coatings were close to each other and varied in the range of 0.64–0.70. The specific wear rate of the coatings modified with 1.5 and 4 vol.% of Al₂O₃ was 2.5 × 10⁻⁵ and 3.1 × 10⁻⁵ mm³ N⁻¹ m⁻¹, respectively, which is about one-fifth of the specific wear rate of stainless steel. It was suggested that the dominating wear mechanisms of the Fe₆₆Cr₁₀Nb₅B₁₉-Al₂O₃ composite coatings are fatigue and abrasion wear. [ABSTRACT FROM AUTHOR]