Chromium carbide powder perfectly combined with nickel/cobalt-based alloys
The main methods for preparing this powder include the electric arc furnace method and the carbothermal reduction method. Among them, the powder produced by the carbothermal reduction method has a finer particle size and a lower cost, making it suitable for large-scale application. When the oxygen content of the powder is less than 0.2%, it can reduce the pores and inclusions in the coating and improve the density of the coating. After spraying chromium carbide powder on the surface of the valve tappets of a car engine, the wear of the tappets can be reduced by 80%, and the major overhaul cycle of the engine can be prolonged. The powder has a high hardness, with a microhardness of up to 2200HV. The hardness of the wear-resistant coating prepared from it can reach over HRC65, making it suitable for applications that require high-stress wear, such as surface strengthening of excavator bucket teeth and crusher hammer heads. The bonding strength between the coating and the substrate is high, reaching over 50MPa, and it is not easy to peel off, ensuring long-term usage effect. In mining machinery, parts treated with chromium carbide coating can withstand the severe impact and friction of ores, and their service life is increased by 4 to 6 times.
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