Damaged special small workpieces by HVOF

       Supersonic flame spraying is the use of propane, propylene and other hydrocarbon gas or hydrogen and high-pressure oxygen in the combustion chamber, or in a special nozzle to generate a high-temperature, high-speed combustion flame, and the combustion flame speed can reach Mach 5 (1500m/ s) above. Often referred to as HVOF. Feeding the powder axially into the flame heats the sprayed particles to a molten or semi-molten state, resulting in a high-bond, dense, high-quality coating. The speed of supersonic flame spraying is very high, but the temperature is relatively low. For WC-Co series cemented carbide, the coating not only has high bonding strength, but also is dense and has excellent wear resistance. Its wear resistance greatly exceeds that of plasma sprayed coating. , is widely used.

For some machine parts that are relatively thin and have a harsh working environment, wear and corrosion are important reasons for the failure of materials and parts. With the development of modern industry, higher surface properties of various equipment parts are proposed. requirements, especially for equipment parts working in special environments, through in-depth research, spraying a metal coating with high strength, high hardness and high wear resistance on the surface can effectively increase the surface performance of the parts, using supersonic flame The coating prepared by spraying has two outstanding features: one is that the composition of the thermal spray powder is not limited, and can be selected according to the special working environment and requirements of the workpiece; the other is that the temperature of the workpiece can be maintained at 100-260 ℃ during the thermal spraying process , thereby reducing deformation oxidation and phase transformation, etc., without destroying or losing the performance of the material itself, the coating can strengthen the surface properties of the material (wear resistance, corrosion resistance, heat resistance, etc.), play a protective role, and Parts that have been reduced in size due to wear, corrosion or poor machining can also be repaired.