Abstract
In this work, the Cr3C2-25% NiCr powder was deposited on stainless steel with different combustion pressures and powder feed rates using HVOF technique. The microstructure, porosity, micro-hardness, indentation fracture toughness, adhesion strength, and wear resistance at 500 °C of the coatings were investigated. The results showed that HVOF sprayed Cr3C2-25% NiCr coatings possessed low porosity, high micro-hardness, and enough adhesion strength. The powder feed rate had obvious effect on porosity, micro-hardness and indention fracture toughness of the coatings, and the coating sprayed under the powder feed rate of 33.5 g/min possessed the optimal performance. The wear tests illustrated that the HVOF sprayed Cr3C2-25NiCr coating possessed good wear resistance at the temperature of 500 °C, in which the coating sprayed at the powder feed rate of 33.5 g/min had the best wear resistance due to its dense structure and enough fracture toughness.
Highlights
Cermet coatings are widely used in industrial applications against tribological degradation even in the corroding environment, due to their high hardness and good corrosion resistance of the employed metal matrices
The carbides phase of Cr7 C3 was found in the coating, which was formed by the decarburization of Cr3 C2
It was indicated that nickel–chromium alloy and some Cr3 C2 carbide were melt and some amorphous phase formed
Summary
Cermet coatings are widely used in industrial applications against tribological degradation even in the corroding environment, due to their high hardness and good corrosion resistance of the employed metal matrices. It has been reported that HVOF-sprayed Cr3 C2 -NiCr coatings exhibit good wear resistance and corrosion resistance in various high-temperature environments [6,7,8,9]. It has been reported that the hardness, fracture toughness of the matrix, reinforcements, as well as the interfacial strength of reinforcement/matrix are the most important mechanical factors that determine the wear resistance and failure properties of cermet-based coatings [13]. The content and particle size of the Cr3 C2 carbides were the two key factors controlling the abrasive wear of the HVOF sprayed Cr3 C2 -NiCr coatings [15,16]. The wear resistance and wear mechanisms of Cr3 C2 -25NiCr coatings at 500 ◦ C were researched and analyzed
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