Overview of Thermal Spray Technology update4

       1.5 Characteristics of thermal spraying technology



From the analysis of the principle and process of thermal spraying technology, thermal spraying technology has the following characteristics.



1. Due to the wide temperature range of the heat source, sprayable coating materials include almost all solid-state engineering materials, such as metals, alloys, ceramics, cermets, plastics, and composites composed of them. Therefore, the substrate can be endowed with surfaces with various functions (such as wear resistance, corrosion resistance, high temperature resistance, oxidation resistance, insulation, heat insulation, biocompatibility, infrared absorption, etc.).



2. The heating degree of the surface of the substrate during the spraying process is small and can be controlled, so it can be sprayed on various materials (such as metal, ceramics, glass, cloth, paper, plastic, etc.), and the structure and properties of the substrate are affected. There is almost no influence, and the deformation of the workpiece is also small.



3. The equipment is simple and the operation is flexible. It can not only spray a large area of large components, but also spray the designated parts; it can be sprayed indoors in the factory or constructed on the outdoor site.



4. The spraying operation has fewer procedures, shorter construction time, higher efficiency and more economical.



With the improvement of thermal spraying application requirements and the expansion of the field, especially the progress of spraying technology itself, such as the increasing energy and sophistication of spraying equipment, the gradual increase in the variety of coating materials and the gradual improvement of performance, thermal spraying technology has achieved great success in the past ten years. The rapid development has not only greatly expanded the application field, but also the technology has developed from the early preparation of general protective coatings to the preparation of various functional coatings; from the maintenance of a single workpiece to the manufacture of a large number of products; from a single coating Preparation has developed to spray system engineering including product failure analysis, surface pretreatment, development and selection of coating materials and equipment, coating system design and coating post-processing; it has become a very active discipline in the field of material surface science. And in modern industry, independent material processing technologies such as casting, forging, welding and heat treatment are gradually formed. It has become an important technological means for the industrial sector to save valuable materials, save energy, improve product quality, extend product service life, reduce costs, and improve work efficiency, and has been more and more widely used in various fields of the national economy.



In general, thermal spraying technology is developing in the direction of high-energy and high-speed spraying, and supersonic spraying has become a hot spot of research in some developed countries, and has formed supersonic flame spraying, supersonic plasma spraying, supersonic arc spraying and cooling. Several important technologies such as spraying.