High velocity oxygen fuel coating

High velocity oxygen fuel (HVOF) is a thermal coating process for surface treatment. In this case, the continuous combustion of fuel is carried out under high pressure in a combustion chamber cooled by water or air. For propellants, fuel gases such as propane, acetylene, ethene, butane, hydrogen and liquid fuels such as diesel or kerosene are used. The oxidizing agent is usually oxygen, but also air. The high pressure of the combustion mixture of fuel and oxygen created in the combustion chamber and the lower expansion nozzle produces the necessary high velocity of the gas jet. Typically, powder spray materials are fed axially into the combustion chamber or radially in the area of the expansion nozzle. As a result, the spray particles are accelerated to high speeds, resulting in very dense sprays with excellent adhesive properties.