Abstract:

304 austenitic stainless steel is widely used in industrial production because of its good corrosion resistance，but limited by the organization，the hardness is lower. In this paper，a high speed electric arc spraying equipment was used to prepare the Ni-Al coating and wear resistant coating on 304 stain-less Steel.  The microstructure，hardness and wear resistance of the coating was studied.  The results show that the wear resistance of the 304 stainless steel can be improved by spraying a Ni-Al alloy and ceramic material.  The prepared Ni-Al alloy coating has excellent microstructure and compact structure.  The microhardness of the coating is 601 HV，and the wear resistance is 3 times to that of 304 stainless steel.  The ceramic coating has good shape，uniform structure and compact structure.  The coating friction coefficient is only 53% of Ni-Al coating.  The microstructure's hardness of the coating is 999 HV，and the wear resistance is about 6 times than that of 304 stainless steel.  The coating has excellent wear resistance.

Key words: 304 stainless steel, electric arc spraying, coating, wear resistance