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In this work 75Cr3C2-25NiCr powder was sprayed on stainless steel with various pressures and powder-feed rates utilizing the HVOF method. The microstructure of the coating and the micro-hardness and porosity, micro-hardness, indentation fracture toughness, adhesion strength and wear resistance at 490 °C of the surface coatings were examined. The outcomes demonstrated that HVOF sprayed 75Cr3C2-25NiCr coatings had low porosity, high micro-hardness and enough adhesion strength. The powder feed rate had an evident impact on the porosity, micro-hardness and indention fracture toughness of the coatings, and the coating sprayed under the powder feed rate of 35 g/min had the ideal execution. The wear-resistance test showed that the HVOF indicated that the 75Cr3C2-25NiCr surface coatings had great influence on the wear resistance at 490 °C, in which the coating sprayed at the powder flow rate of 35 gram/min had the best wear resistance because of its thick and dense structure and having enough fracture toughness.

Influence of the process parameters on high-velocity oxygen-fuel-sprayed 75Cr3C2-25NiCr coatings