A new type of WC-12Co thermal spray powder and its preparation method

       Patent name: A new type of WC-12Co thermal spray powder and its preparation method

Technical field:

The invention relates to a powder technology for supersonic high-speed flame spraying or other thermal spraying, in particular to a novel WC-12CO thermal spraying powder and a preparation process thereof.

Background technique:

Thermal spraying technology is a key technology in the field of surface modification. By preparing a layer of wear-resistant coating on the surface of the workpiece to be processed, the wear resistance and corrosion resistance of the workpiece can be greatly improved. Thermal sprayed WC/Co coating is widely used in aerospace, metallurgy, machinery and other fields due to its high hardness and good toughness as a wear-resistant and corrosion-resistant coating. Compared with the electroplated hard chromium layer, the thermal sprayed WC/Co coating has obvious advantages in wear resistance, corrosion resistance, fatigue resistance, etc., and the preparation speed is fast and the environmental pollution is small. The use environment of the corrugated roll coating is harsh, and the sand and gravel rolling occurs frequently, and it is prone to pits and depressions when used under the conditions of poor paper quality. Therefore, it is required that the coating on the top, side and bottom of the tooth is evenly distributed, and it needs to be polished to the required finish after processing, and the coating is required to have good hardness and excellent toughness. However, when using traditional WC-12C0 thermal spray powder, the higher the hardness of the coating is, the lower the toughness is. According to actual data, when the hardness is increased by 2.4%, the fracture toughness index can be reduced by up to 8.6%; The toughness of the coating decreases significantly; the contradictory characteristics of hardness and toughness make it impossible to take into account the requirements of hardness and toughness during spraying, and it is impossible to ensure the quality of the corrugated roll coating to reach the best state.