What is Thermal spraying ? Thermal Spraying metal coatings are depositions of metal which has been melted immediately prior to projection onto the substrate. Thermal Spraying covers a wide range of techniques in which material is heated rapidly on a hot gaseous medium and simultaneously projected at high velocity onto a surface, to produce a coating. The range of alloys that can be sprayed is immense based mainly on Nickel, Cobalt, Aluminum and Iron but containing elements as diverse as boron, molybdenum and tungsten in fact it would be true to say that an alloy can be provided for almost any application. Sprayed metal coatings have been used for a number of years and exposure tests have proved them to be superior to conventional paint coating. How is the alloy sprayed ? The alloy is sprayed via a torch that is connected to a gas source such as oxygen and acetylene. The delivery system of the torch is dependant on its manufacturer, however two main methods are employed: Micro-pul...
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