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THERMAL SPRAY TECHNOLOGY
Thermal spray coating involves the use of a torch to heat a material, in powder or wire form, to a molten or near-molten state, and the use of a gas to propel the material to the target substrate, creating a completely new surface. The coating material may be a single element, alloy or compound with unique physical properties that are, in most cases, achievable only through the thermal spray process.
Thermal spray coatings are a highly cost-effective and straight-forward method for adding superior properties and performance qualities to a given engineering surface. The variety of products and coatings that can be enhanced by thermal spray are virtually limitless. The coatings are usually metallic, ceramic, carbides, or a combination of these materials to meet a range of physical criteria.
We have two types of thermal spray system, in which we are using. The powder type and the Wire. Arc spray.
For the powder type, we have the TeroDyn System 2000. It produces a very stable and thermally efficient flame that delivers up to 110,000 BTU/hr.* This high energy level makes it possible to produce superior quality coatings while spraying at very high deposition rates.
For the Wire Arc Spray system, as shown here. We have the TAFA-PRAXAIR brand.
The Electric Arc Wire Spray process uses two metallic wires, usually of the same composition, as the coating feedstock. The two wires are electrically charged with opposing polarity and are fed into the arc gun at matched, controlled speeds. When the wires are brought together at the contact point, the opposing charges on the wires create enough heat to continuously melt the tips of the wires. Compressed air is used to atomize the now molten material and accelerate it onto the work piece surface to form the coating.
