Study on the Microstructure and Properties of Laser Remelted Ceramic Coatings on Low Carbon Steel Surface

摘要

The plasma spraying Al2O3-13％TiO2 (abbreviated as AT-13) ceramic coatings on Q235B steel surface were dealed with laser remelting technique.The microstructure and properties before and after laser remelting were studied.Experiment results shown that the microstructure of laser remelted ceramic coatings was dense,no porosity appeared.The main compositions of laser remelted ceramic coatings were αt-Al2O3 and a small amount of TiO2 and TiAl2Os.Microhardness of AT-13 plasma spraying coatings and laser remelting coatings were measured with vickers,and the maximum microhardness value of the former was 1000 HV0.2,while that of the latter was 1700 HV0.2; The average bonding strength value of AT-13 plasma spraying coating was 24.36 Mpa,while the average bonding strength value of laser remelting coating was more than 67.02 Mpa.The wear resistance of laser remelting coatings was higher than that of AT-13 plasma spraying coatings through the pin-dish particle wear test.