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What Is Thermal Spraying?
The principles of thermal spraying were developed at the beginning of the twentieth century in Switzerland. After enjoying commercial success in Europe, the technology was introduced to England and the United States in the early 1920's. Thermal spraying is a process in which metallic and nonmetallic materials are deposited in a molten or semi-molten form on a prepared substrate imparting properties that the substrate would not otherwise possess. Since many metals, alloys, ceramics, plastics, cermets and combinations can be applied through this process, its potential is almost limitless. Using a thermal spray gun, the feedstock material (in powder or wire form) is melted by electric arc or combustible gas and accelerated on to a substrate. As the particles strike the surface, they flatten, adhere and conform to the irregularities of the surface. Upon impact with the substrate, these flattened particles cool and build-up to form a coating.
| Manufacturers can improve part performance and reduce the associated costs by applying coatings that lengthen part life, using less expensive base materials. Parts may also be enhanced with unique traits using thermal spraying.Worn and corroded parts, which would otherwise be scrapped, can be reclaimed using thermal spraying. The part can be brought back to specification again and again yielding considerable savings over time. Though very high temperatures are necessary to melt the material prior to spraying, the part being coated is actually subjected to very little heat -less than 300 °F. This allows the use of many different substrates. |
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