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Thermal spray

Time：2019-05-27 15:27:32  From：  Author：

 Thermal spray processing is used to heat materials in particle, wire, or rod form, and accelerate and propel them by a thermal jet through a nozzle towards a surface. Upon impacting the surface, the individual molten or softened droplets impact, spread, cool, and solidify to form continuous coatings. Thermal spraying has grown into a well established industrial technology because of the very wide range of coating materials and substrates that can be processed, including metals, high melting point ceramics, and polymers. In 1997, the global thermal spray coating industry represented a $1·35 billion business. The major advantages of thermal spray processes, compared to some other coating application techniques, are that coatings can be applied and repaired in the eld and application is not restricted by the size of the surface to be coated. Also, particle heating, quenching, consolidation, and post-treatment are combined into a single step process by which relatively thick coatings can be produced. Deposition eYciency, the ratio of the weight of spray deposit to the weight of the material sprayed, is, however, lower than in other coating processes. This is mainly due to material overspray at the edges of the coating surface, particles insuYciently entrained in the jet and blown oV, or unmelted particles which rebound from the substrate surface. One of the biggest disadvantages of the thermal spraying processes is that they generate high noise levels, which can vary from 90 to 130 dB.


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