1. Prepare new parts, using arc spraying to manufacture stamping plastic and leather product molds, plasma spraying to process ceramic nozzles or refractory metal nozzles, radar fairings, high-temperature furnace components, and fiber-reinforced thorium-gold composite engine parts.
2. Material modification, thermal spraying processing to treat common materials, the chemical composition and structure of the surface can be changed as needed to achieve the purpose of strengthening certain properties of the surface.
3. Repairing old parts and thermal spraying processing can not only restore the size of the parts, but also strengthen the performance of the surface of the parts and double their life, which is of great economic significance.
Second, the process selection principle of thermal spraying
(1) The coating bonding force is not high, and the melting point of the spraying material does not exceed 2500°C. Flame spraying with low equipment cost can be used.
(2) Plasma spraying should be used for some of the more expensive parts that require higher coating performance.
(3) Arc spraying should be used for metal spraying with a large amount of work.
(4) Metal or alloy coatings requiring high bonding force and low porosity can be sprayed with supersonic velocity; metal or ceramic coatings requiring high bonding force and low porosity can be sprayed with low pressure plasma; explosive spraying can be used for important zero Strengthening of components.
(5) For workpieces with large batches, automatic spraying should be used.
(6) For parts with particularly high safety requirements, tests and demonstrations must be carried out before spraying techniques and materials are selected.
Three, what are the main points of thermal spray processing
Thermal spray processing is a new technology for surface protection and strengthening of materials. It uses gas, liquid fuel, electric arc, and plasma arc as heat sources to heat the material powder, wire, or bar to a molten or semi-melted state with the help of flame thrust Or compressed air spray to adhere to the pre-treated surface workpiece, forming a coating on the surface, giving the workpiece wear resistance, corrosion resistance, high temperature resistance, oxidation resistance, heat insulation, insulation and other characteristics, so as to improve the performance of the workpiece and A technology that prolongs the service life of equipment. Due to the wide selection of thermal spraying processing technology and coating materials, the operation is simple and flexible, and it is particularly suitable for on-site construction and partial repair of workpieces.
