Erosion and Wear Resistance of Cr3C2-NiCr Composite Ceramic Coating for Gun Barrel

摘要

A Cr3C2-NiCr coating was prepared on the PCrNi3MoVA steel via HVOF for the further use in gun barrel to reduce the wear and erosion of the PCrNi3MoVA steel. The microstructure and interfacial bonding state of the coating were analyzed by scanning electron microscopy (SEM). The erosion resistance of the coating was tested by high-speed hot airflow generated by a modified pressure-vented vessel. The high temperature friction coefficient and high temperature wear resistance of Cr3C2-NiCr coating and PCrNi3MoVA steel substrate were compared by high temperature friction and wear test. Results show that the Cr3C2-NiCr coating combines well with PCrNi3MoVA steel without cracking and shedding. The coating does not fall off under high-speed airflow erosion yet with an oxidation of the surface. The high temperature wear resistance of Cr3C2-NiCr coating is significantly better than that of PCrNi3MoVA steel substrate.