LAUSR

Abstract In this study, 4 types materials, i.e., WC-12Co, WC-10Co4Cr, NiCr-Cr 3 C 2 and Ni60 were coated on the bare copper to simulate the wear resistant materials on the surface of strip casting rolls. Then, these coatings were characterized by the field emission scanning electron microscopy (FE-SEM), energy-dispersive spectrometer (EDS), X-ray diffraction (XRD), and laser scanning confocal microscope (LSCM). Next, the heat transfer performance of those coatings was evaluated through the droplet solidification tests. The results indicated that the maximum interfacial heat flux and the total heat-removed is varying with different coatings, in which the highest values of 6.25 MW/m 2 and 7.21 MJ/m 2 in the case of bare copper system could be reduced to 2.62 MW/m 2 and 4.22 MJ/m 2 with the application of WC-10Co4Cr coating. The heat transfer performance of different coatings is determined by the comprehensive effects of the characteristics of coatings, such as microstructure, porosity, phase composition, adhesion property, and thickness, etc. Furthermore, the results demonstrate that the Ni60 coating with a low porosity (0.78%), good adhesion property and thin thickness (14.1 μm), etc., shows a better heat transfer capability, through which the maximum heat flux is 5.24 MW/m 2 and total heat removed is 5.78 MJ/m 2 , and shows great potential to be used in the strip casting process.