Effect of WC addition on microstructure and functional properties of Fe-based metallic glass coatings obtained by detonation spraying

In the present work, the possibility of obtaining coatings with a Fe-based metallic glassy matrix reinforced with WC particles by detonation spraying was demonstrated. The SHS7574-WC powder mixtures with 10 vol% WC, 20 vol% WC, 30 vol% WC, and 40 vol% WC were used for coating deposition on carbon steel substrate. The SHS7574 alloy powder had a predominantly crystalline structure. The SHS7574 and SHS7574-WC coatings were deposited by detonation spraying using the C2H2 + 0.3 & Scy;(3)& Ncy;(6) + 1.4 O-2 gas mixture. It was found that the addition of WC powder (>20 vol%) to the SHS7574 powder can improve microhardness and wear resistance, and also reduce porosity of the coatings. Composite coating obtained by spraying of the SHS7574-40 vol% WC powder mixture demonstrated the highest hardness and wear resistance under dry sliding conditions. The wear resistance of this coating was twice that of pure SHS7574 coating. Detonation coatings obtained in the present work showed high resistance to neutral salt fog for 180 h.