Application of High Velocity Oxygen Fuel Spraying

       

High Velocity Oxygen Fuel Spraying is a high-temperature and high-speed combustion flame generated by the combustion of hydrocarbon gas such as propane and propylene or hydrogen and high-pressure oxygen in the combustion chamber or in a special nozzle. The combustion flame velocity can reach more than Mach 5 (1500m / s). It is usually called HVOF (high velocity oxygen fuel). When the powder is fed axially into the flame, the sprayed particles can be heated to a molten or semi molten state and accelerated to a speed of 300-500m / s or even higher, so as to obtain a high-quality coating with high bonding strength and compactness. The supersonic flame speed is very high, but the temperature is relatively low. For WC Co cemented carbide, it can effectively inhibit the decomposition of WC in the spraying process. The coating has not only high bonding strength, compactness and excellent wear resistance. Its wear resistance is much higher than that of plasma spraying layer, which is equivalent to that of explosive spraying layer, but also exceeds that of electroplated hard chromium layer and spray melting layer. It is widely used.

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