D. He, B. Fu, J. Jiang, X. Li, Beijing University of Technology, Beijing, China
Thermal spray processes are widely used to protect materials and components against wear, corrosion and oxidation. As commercial arc sprayed coatings have been used to a limited extent in applications involving erosion and abrasion wear, developing attractive wear resistance arc sprayed coatings has been found necessary. Abrasive wear test has been tested for three Fe-based composite coatings containing varied contents of Cr3C2 particles as hard phase. Scanning electron microscope (SEM) has been used for observing the surfaces of the composite coatings, and wear mechanisms of the coatings have been discussed on the basis of the observation. The results obtained from MLS-225 wet sand/rubber wheel test showed that the abrasive wear resistance of composite coatings with Cr3C2 hard phase is about 28 times higher than that of Q235 mild steel. The coating were proved beneficial to produce an uniform and dense lamellar structure ,The excellent abrasive resistance of the composite coatings with Cr3C2 particles were found related to three major factors: enhanced bulk hardness, compact lamellar structure and strong bond between matrix and hard phase, as well as a load supporting system constructed by hard phase structure.
