Characteristics of the HVOF_sprayed $\textrm{Cr}_{3}\textrm{C}_{2}$-NiCr Coationg Layer

The purpose of this study was performed to compare to the characteristics (microstructure, phase change and hardness, erosion rate) of HVOF sprayed coatings with 20wt% NiCr claded and 7wt%NiCr mixed powder. In the case of the 20wt% NiCr claded powder, microstructural feature showed that the primary was remained in the coating but was barely remained in the mixed coating. As a results of XRD analysis, both 20wt%NiCr claded and 7wt% NiCr mixed powder was decomposed during spraying but the degree of decomposition of the 20wt%NiCr claded was lower than 7wt%NiCr mixed powder. After spraying the mixed powder for microhardness was higher than claded powder and which was increased up to = 1665 after heat treatment to . however. 20wt%NiCr claded became to decrease at which was the maximum.