Process characteristics of thermal spraying technology

       As one of the surface coating methods, thermal spraying technology has the following characteristics from the point of view of construction and economy:



(1) The substrate material of the coating is almost unlimited, such as metal materials, inorganic materials (glass, ceramics, stone powder), organic materials (also including wood, cloth, paper) and the like.



(2) There are a wide range of coating materials, such as metals and their alloys, ceramics, plastics and their composite materials. In addition, composite coatings or superimposed coatings of different materials with special properties can be made.



(3) The size and shape of the sprayed construction objects are not limited. It can be sprayed on the entire surface or on the limited surface of large components. This is economical when coating is required on the local surface of large components. and convenient method.



(4) The performance of the base metal does not change. Except for the flame spray melting process, the heating temperature of the base metal during spraying construction is low, so that the performance of the base metal does not change and the deformation of the workpiece is small. Therefore, thermal spraying is also called a "cold process". ".



(5) The thickness of the coating can be changed in a wide range, and the thickness of the coating formed by spray melting can reach several millimeters.



(6) It can be sprayed and formed. Thermal spraying technology can not only form a coating on the surface of the material, but also can be used to manufacture the entity of mechanical parts, that is, spray forming. The method is to form a coating on the surface of the forming die first, and then use a suitable method to remove the forming die to form a coated formed product.



(7) When the coating area is small, the economy is poor. When the small parts are sprayed or the required coating area is small, the amount of the useful coating combined on the substrate accounts for less of the spraying material consumed during spraying, and the economy is poor. In this case, it is more appropriate to use electroplating instead.



(8) Pay attention to the ventilation of the operation room. Since most of the pretreatment of the surface of the base material is sandblasting and the particles are scattered during the spraying, it is necessary to pay attention to the ventilation.



Master the characteristics of spraying technology, and then comprehensively consider whether to use thermal spraying according to the shape, dimensional accuracy and required surface properties of surface coating products, equipment costs and operating costs, and the environmental conditions of the job site. The best economic benefits of thermal spray technology are obtained on the basis of coating performance and quality.