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Introduction
Thermal spraying is a surface strengthening technology, is an integral part of surface engineering technology, and has been the focus of China's promotion of new technology projects. It is the use of some heat source (such as electric arc, plasma spray, combustion flame, etc.) will be powdered or filamentary metal or non-metallic materials heated to a molten or semi-molten state, and then with the help of the flame to stay by itself or compressed air at a certain speed to the surface of the pre-treated substrate, the formation of a variety of functions of the surface of the coating of the deposition of a technology.
Thermal Spraying Principle
Thermal spraying refers to a series of processes in which acceptable and dispersed metallic or non-metallic coating materials, to a molten or semi-molten state, are deposited onto a prepared substrate surface, forming a spray deposition layer. The coating material may be in the form of a powder, strip, filament, or rod. The thermal spray gun is supplied with the necessary heat by a fuel gas, an electric arc, or a plasma arc to heat the thermal spray material to a plastic or molten state, which is then accelerated by compressed air to cause a constrained beam of particles to impinge on the surface of the substrate. The particles impacted on the surface are deformed by stamping, forming laminated sheets that adhere to the prepared substrate surface, which then cools and builds up to create a layered coating. Due to the different coating materials, the coating can realize the function of high-temperature corrosion resistance, anti-wear, heat insulation, anti-electromagnetic wave, etc.
Definition: Thermal spraying is a metal surface processing method in which spraying material in the molten state is atomized and sprayed on the part's surface through high-speed airflow to form a sprayed layer. We call the unique working surface "coating" and the working method of manufacturing coating "thermal spraying,” a general term for spraying and spray welding using various heat sources.
Usage: This is made under the action of high-speed airflow atomized into fine molten droplets or high-temperature particles, sprayed to the surface of the treated workpiece at a very high flying speed, forming a solid covering layer so that the surface of the workpiece to obtain a different hardness, abrasion-resistant, corrosion-resistant, heat-resistant, oxidation-resistant, heat-insulating, insulating, electrically conductive, sealing, disinfecting, anti-microwave radiation, and a variety of other unique physicochemical properties. It can be repaired in equipment maintenance so that the scrapped parts and components are "back from the dead"; it can also be strengthened in manufacturing new products and pre-protection to be a "life extension.”
Thermal spray materials: Spray powder is critical in all thermal spray materials. Thermal spraying alloy powder, including nickel-based, iron-based, and cobalt-based alloy powder, according to the different hardness of the coating, is used in the repair and protection of mechanical parts.
01
The substrate material is not restricted, can be metal and non-metal, and can be sprayed on a variety of substrate materials.Strong adaptability and good economic efficiency and other advantages
02
The coating materials that can be sprayed are extensive; thermal spray technology can be used to spray almost all solid engineering materials, such as carbide, ceramics, metal, graphite, etc.
03
A variety of coating properties can form a wear-resistant, corrosion-resistant, heat insulation, antioxidant, insulation, conductive, radiation, and other coatings with a variety of unique features
04
The operation process is flexible and convenient, not limited by the shape of the workpiece; construction is convenient
05
The coating thickness can be from 0.01 to several millimeters
06
The temperature rise of the base material in the spraying process is slight, and does not produce stress and deformation
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