First, the use of thermal spraying processing
1. Prepare new parts, use arc spraying to make stamping plastic and leather parts molds, plasma spray processing ceramic nozzles or refractory metal nozzles, radar fairings, high temperature furnace components, and engine parts of fiber-reinforced sheet metal composite materials.
2. material modification, thermal spraying processing of ordinary materials, can change the chemical composition and structure of the surface as needed, to achieve the purpose of strengthening certain properties of the surface.
3. the old parts repair, thermal spray processing can not only restore the size of the parts, but also strengthen the surface performance of the parts, double the life of the life, the economic significance is very significant.
Second, the principle of process selection of thermal spraying
(1) The coating bonding force requirement is not high, and the melting point of the spraying material does not exceed 2500 ° C, and flame spraying with low equipment cost can be adopted.
(2) Some of the more expensive parts that require higher coating performance should be plasma sprayed.
(3) The metal spraying construction with large engineering volume should adopt arc spraying.
(4) Metal or alloy coatings requiring high bonding strength and low porosity can be sprayed at supersonic speed; metal or ceramic coatings requiring high bonding strength and low porosity can be sprayed with low pressure plasma; explosive spraying can be used for important zeros. Enhancement of parts.
(5) For large batches of workpieces, automatic spraying should be used.
(6) For parts with particularly high safety requirements, testing and demonstration shall be carried out before selecting the spraying process and materials.
Third, what are the hot spray processing points
Thermal spray processing is a new technology for surface protection and strengthening of materials. It uses gas, liquid fuel, and arc and plasma arc as heat sources to heat material powder or wire and bar to a molten or semi-molten state by means of flame thrust. Or compressed air spray adhered to the pre-treated surface workpiece, forming a coating on the surface, giving the workpiece wear-resistant, corrosion-resistant, high-temperature resistance, oxidation resistance, heat insulation, insulation and other characteristics to improve the performance of the workpiece and A technology that extends the life of equipment. Due to the wide range of thermal spray processing technology and coating materials, the operation is simple and flexible, especially suitable for on-site construction and partial repair of workpieces.
