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Flame spray process
Arc spray process
Plasma spray process
Detonation spray process
HVOF spray process (High Velocity Oxygen Fuel)
The cold gas dynamic spray process
Detonation gun is considered the first high velocity thermal spray process. It consists of a long, closed at one end and open at the other end, water-cooled gun barrel. Oxygen and fuel gas (acetylene C 2H 2 most common) mixture is fed into the barrel together with coating material, which is in powder form. The gas mixture is ignited by a spark plug. Following detonation melts and accelerates the particles up to about a velocity of 600 m/s. After each detonation barrel is flushed with nitrogen (N2). There are 1 – 15 detonations per second, depending on the equipment used.
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