Abstract
The final purpose of our study is to discuss the selection of surface modification processes and/or materials from a viewpoint of blast erosion properties. In this study, an experimental investigation was carried out on the blast erosion resistance of thermal sprayed metal coatings. Eight different coatings of 18Cr-8Ni steel, 13Cr steel, Cu, Co base alloy and Cu-Ni alloy, which were produced by FLSP, EASP and PSP, were examined in comparison with substrate. materials. The effect of test conditions, such as blast angle, blast particle size and air pressure, on the erosion resistance were made clear. The better correlation between volume erosion rate and Vickers hardness after erosion could not be obtained from the experimental results. It appears that the volume erosion rate of coatings may be extremely affected by spraying conditions in the case of same materials. It was also confirmed by experiments that the volume erosion rate of 18Cr-8Ni steel coatings could be improved by heat treatment (600°C, lhr) for stress relief and phase stabilization.
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