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High velocity oxy-fuel coating spraying (HVOF) High velocity air fuel (HVAF) Warm spraying; Cold spraying; Spray and Fuse; In classical (developed between 1910 and 1920) but still widely used processes such as flame spraying and wire arc spraying, the particle velocities are generally low (< 150 m/s), and raw materials must be molten to be ...
Applications of spray technology are more pronounced during the course of base and clear coatings process which are encompassed as the last stages in automotive coating. Among others rotary bells mounted on robots and hvlp (high volume, low pressure) sprayers are widely used to paint car bodywork during manufacture. [8]
Most coatings can be sprayed with very little thinner added, thereby reducing drying time and decreasing the release of solvent into the environment. Care must be used when operating, as airless spray guns can cause serious injury, [9] such as injection injuries, due to the paint ejecting from the nozzle at high pressure.
Spray drying and spray painting are the most important and common uses of this technology. Many industries need to convert a large mass of liquid into a dispersion of small (micron-size) droplets (generate a spray). Some examples of this need are evaporative cooling, meteorology, printing, medical applications, spray combustion, coating, and ...
It is used for spraying pure metal powders with the sizes of 5–50 μm. In low-pressure cold spraying (LPCS), the working gas is a compressed gas with pressure 0.5–1.0 MPa, flow rate 0.5–2 m 3 /min and the heating power 3–5 kW. It is used for spraying a mechanical mixture of metal and ceramic powders.
Detonation spraying produces coatings of very high chemical bond strength and hardness. Coatings are of low porosity, oxygen content and have a low to medium surface roughness. This is achieved due to the extremely high temperatures and velocities produced by the detonation gun during surface coating application. [6]
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