Abstract
The microstructure, phase consistence and microhardness of thermal sprayed coatings were investigated. The tungsten and chromium carbide coatings and also composite NiCrSiB coating were analyzed. The microstructure of coatings were observed by using optical microscopy (MO), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Almost equiaxial carbide particles settled inside the surrounded material of coating were found. The cracks propagating thorough the particles and along boundaries between the particles and surrounded material were observed. This phenomenon was connected with the porosity of coatings. The decarburization process was detected in coatings by phase composition investigation using X-ray method. The decarburization process was the reason due to which beside initial Cr3C2 the Cr7C3 and Cr23C6 particles were found. In the tungsten coatings beside the initial WC carbides the W2Cones were found.
Highlights
The coating should provide a good balance between the abradability and the erosion resistance
The microstructure of the different chemical composition of carbides coatings deposited by plasma spraying (PS) and High Velocity Oxygen Fuel (HVOF) thermal spray processes were tested and investigated
The highest microhardness show WC-Co-Cr coating deposited by HVOF and the lowest Cr3C2-NiCr deposited by plasma spraying method
Summary
The coating should provide a good balance between the abradability and the erosion resistance. The research on the erosion wear behavior of the coatings has not been much reported. Because of high porosity and much non-metal phase in the coating its erosion wear rule and behavior can be different from those of bulk material and some coatings. The thermal spraying coatings are the effective wear resistant protection preserving the surface of the different appliances, machines and plants in the industry conditions [1,2]. The microstructure of the different chemical composition of carbides coatings deposited by plasma spraying (PS) and High Velocity Oxygen Fuel (HVOF) thermal spray processes were tested and investigated. In the paper the microstructure, phase consistence and hardness of thermal sprayed coatings were investigated
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