Screw shaft HVOF spray tungsten carbide coating

Tungsten carbide is a compound composed of tungsten and carbon. It is a black hexagonal crystal with a metallic luster and a hardness similar to diamond. During the running process, the screw shaft is subjected to the abrasive friction of the deposit between the slots, the screw blade surface wears faster, the shaft diameter becomes smaller, and the screen surface gap is not meet requirement. So it was decided to strengthen the replaced old screw shaft by a HVOF spray tungsten carbide method.

The cost of updating the new shaft on the screw shaft is higher. The use of HVOF spraying of tungsten carbide is relatively low-cost, and each time a shaft is repaired, the company saves a lot of equipment maintenance costs.

Another compound of tungsten and carbon is ditungsten carbide, which has a chemical formula of W2C, a melting point of 2860 ° C, a boiling point of 6000 ° C, and a relative density of 17.15. Its nature, production method and application are the same as tungsten carbide. HVOF sprayed cobalt-based Tungsten carbide alloy powder or nickel-based Tungsten carbide alloy powder and chromium-based Tungsten carbide alloy powder hardness can reach HV1200 high temperature resistant 850 degrees, making valve parts resistant to wear, anti-corrosion, high temperature resistant, anti-oxidation. Exceeding manual surfacing, chrome plating, carburizing, quenching and tempering process etc, the production efficiency can be increased by more than 2 times, the production cost can be reduced by more than 50%, and the service life can be extended by more than 10 times.


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