Correct option is D
HVOF stands for High Velocity Oxygen Fuel. It is a thermal spray coating process in which a mixture of fuel and oxygen is combusted to produce a high-temperature, high-velocity gas stream.
This stream is then used to propel coating materials, such as metals or ceramics, onto a surface at high speeds. The resulting coating is dense and well-bonded, providing excellent wear and corrosion resistance. HVOF is widely used in industries requiring protective coatings for components subjected to harsh environments.
In this process, a fuel (such as kerosene, propane, or hydrogen) is mixed with oxygen and ignited in a combustion chamber. The resulting high-pressure gas mixture is expelled at a high velocity, propelling the powdered metal or ceramic coating material onto the workpiece. The high velocity ensures that the coating particles reach the substrate with high energy, causing them to bond effectively.
