Study on Properties of CoNiCrAlY Coating Prepared by Supersonic Flame Spraying
CoNiCrAlY coating was used as a transition coating between working coatings and metal matrix.The CoNiCrAlY coating was sprayed on 45 steel surface by SHV-50 supersonic flame spraying equipment.The microstructure,microhardness,porosity,surface roughness,bonding strength and electrochemical properties of the CoNiCrAlY coatings were characterized.The results show that the porosity of the CoNiCrAlY coating obtained by SHV-50 supersonic flame spraying is 0.48%,the average microhardness of the coating is 497.2 HV0.2.The average bounding strength of the coating is 70 MPa.The number of thermal shocks up to 26 times.The surface roughness of the coating is Ra6.43,which is better for the combination of surface layer and transition layer.CoNiCrAlY coating has stronger electrochemical corrosion resistance than matrix.So CoNiCrAlY coatings sprayed by SHV-50 supersonic flame spraying equipment can be used as transition layers between working coatings and metal substrates.
NETL
NSTL
万方数据
