Microstructure and Wear Characterization of Cold-Sprayed FeAl/WC Intermetallic Matrix Composite Coating

摘要

A FeAl/40(vol.%)WC intermetallic matrix composite coating was produced by cold spraying of ball-milled Fe/Al/WC powder mixture assisted with annealing treatment. The microstructure of FeAl/WC composite coating was characterized and the effect of annealing temperature on the wear peformance was investigated. The results showed that the dense FeAl/WC composite coating reinforced with multiple-scaled WC particles can be fabricated by cold spraying of ball-milled composite powder. The composite coating annealed at 650°C exhibited the better wear performance and its wear rate is around one fifth that of 316L stainless steel. Investigation of worn surfaces indicated that the predominant wear mechanism of the cold-sprayed FeAl/WC composite coatings appeared to the preferably microcutting of the matrix phase and the hard WC particles were effective to protection to the matrix against abrading particles.