Introduction of tungsten carbide for thermal spraying and several typical applications

       With the tightening of national environmental protection policies and the inability of chrome plating to meet the requirements of user equipment performance and long life, supersonic flame sprayed tungsten carbide is gradually accepted by many industrial enterprises as a standard process for wear and corrosion resistance applications.



Usually for purely wear-resistant applications, such as steel process rolls, wear-resistant guide rolls, etc., cobalt/tungsten carbide, such as Wc 12Co or Wc17Co, can be selected; when facing corrosion or wear, corrosion, cobalt chromium/carbide Tungsten (eg Wc 10Co4Cr) performs better.



For example, the corrugating roller of the corrugating machine, the rollers are driven by mutual extrusion through the tooth shape. With the long-term extrusion and wear between the roller body and the pulp, the tooth shape changes and the corrugated roller fails. At this time, spraying Wc 12Co or Wc 10Co4Cr through the supersonic flame process (HVOF or HVAF) can greatly improve the surface wear resistance of the corrugated roll.



In addition, due to the dense tooth profile of the corrugated roller, polishing is required after spraying. The use of tungsten carbide fine powder (such as 5-25 microns) can reduce the roughness of the sprayed state, thereby saving the finishing time after spraying and reducing the polishing cost.



In oil and natural gas screw drilling tools, due to the erosion of sediment and even the corrosion of saturated brine, supersonic flame spraying Wc10Co4Cr is becoming the first choice for many users in Europe, America and even China.