Nickel-chromium-chromium carbide (NiCr-Cr3C2) high temperature wear-resistant composite powder

       In the NiCr-Cr3C2 series, the NiCr alloy content is generally 25%, the melting point is 1400 ° C, and the thermal expansion coefficient is 10.9x10-6K-1 (150 ° C ~ 980 ° C). Below 900 ° C, it has excellent erosion resistance, corrosion resistance and resistance. wear properties. However, NiCr-Cr3C2 will be seriously oxidized in the air at 1100℃~1400℃, and the composite powder is prone to decarburization during spraying. The degree of decarburization depends on the type of powder and spraying conditions. The composite powder is prone to decarburization during spraying, and the degree of decarburization depends on the type of powder and spraying conditions. The material can be used for high-temperature abrasive wear, micro-vibration wear, gas erosion wear and hard surface wear coatings used in oxidizing media at 540°C to 980°C. For example, it is used in jet engine rotors, turbine blades, turbine face seals, turbine muffler baffles, exhaust valve sealing surfaces, thermoforming dies and rollers, etc.



     Nickel-chromium-chromium carbide (NiCr-Cr3C2) composite powder includes two types: one is a coated composite powder made by coating Cr3C2 particles with nickel and chromium respectively; the other is a nickel-chromium heat-resistant alloy NiCr -80/20) powder mixed with crystalline Cr3C2 powder.

     Coatings can be prepared by explosive spraying, supersonic flame spraying and plasma spraying processes.