The process of thermal spraying heating the sprayed material

       Supersonic spraying is a method of using a heat source to heat the sprayed material, atomizing, spraying and depositing the particles in the molten or nearly molten state on the surface of the substrate to form a special surface layer. At present, there are three main heat sources used in spraying: one is the arc heat source, the second is the plasma flame heat source, and the third is the natural gas heat source. From this, thermal spraying methods can be divided into three categories: arc spraying, plasma spraying and flame spraying.



Spray welding is a method of using a heat source to heat the material, spray it onto the surface of the substrate, and then melt it onto the surface of the substrate to form a special surface layer. At this stage, the heat source used in spray welding is mainly oxyacetylene flame.

Basic requirements for thermal spray powders:



The composition, morphology and structure of the plasma spray powder used in aero-engines were analyzed, and the domestically developed powders of the same type were compared with those produced abroad. In terms of aspects, it has reached or approached the foreign level, but the structure, density and composition phase distribution of the coating after spraying are far behind similar foreign coatings. An important part of the localization work.







Spray powder occupies a very important position in the whole thermal spray material. Thermal spray alloy powders include nickel-based, iron-based and cobalt-based alloy powders, which are used in the repair and protection of mechanical parts according to different coating hardness.



1. The base material is not limited, it can be metal and non-metal, and can be sprayed on various base materials;



2. The coating materials that can be sprayed are extremely wide, and thermal spraying technology can be used to spray almost all solid engineering materials, such as cemented carbide, ceramics, metals, graphite, etc.;



3. The temperature rise of the base material is small during the spraying process, and no stress and deformation are generated.