Effect Of Rare Earth On Ni-based Alloy Coatings Made By High Temperature

The HTWY180-MK laser soldering machine was used to get metal-ceramic coatings with different contends of rare-earth on 45 steel.The effects of rare-earth on microstructure and properties of the coatings were investigated.The two-steps method of composite electrodeposition and electric discharge was used to get Ni/Al2O3 coatings.The effects of rare-earth on microstructure of coatings were investigated.The result shows that the microstructure and properties of clad coatings with Y2O3 /CeO2 are better than these of the coatings without Re-oxide, and the crackle, holes, inclusions in the coatings with Re-oxide are reduced and TiC particles become round and smooth. A stable region where the microhardness is as high as about HV700 exists in the laser layers added rare-earth oxide. The distribution of microhardness in the composite coatings added 0.5% rare-earth oxide is better than that of the others. XRD and EDS result indicates that laser cladding coatings are made up of kamacite solid solution and TiC. New phase doesn't appear after rare-earth is added.The result of the two-steps method experiments shows that the distribution of heat power is non-uniformly, and the interface of composite coatings was not metallurgical bonding. The distribution of heat power added 5g/L La2O3 into the working fluid is better than that of the others.