Chromium carbide powder for improving high-temperature stability
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. This chromium carbide powder is dark grayish black in color, with a particle size of 20-50μm. It has outstanding high-temperature stability and maintains stable performance below 800℃. By surfacing and cladding the air inlet of metallurgical blast furnaces and the surface of hot rolling mill rolls, the formed cladding layer is wear-resistant and resistant to high-temperature oxidation, which can reduce the maintenance frequency of high-temperature operation equipment and ensure continuous production.
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