Thread Content
Laser cladding technology uses high-power laser beams focused by optical elements to obtain extremely high energy density, which instantly melts the surface of the substrate. At the same time, the alloy powder that is preset or automatically sent to the surface of the substrate in synchronization with the laser beam is completely melted to obtain a dense coating that is metallurgically combined with the substrate. The materials used in laser cladding are relatively wide. At present, laser cladding of self-fluxing alloy powders and ceramic phases on stainless steel, mold steel, malleable cast iron, gray cast iron, copper alloy, titanium alloy, aluminum alloy and special surfaces such as cobalt-based, nickel-based and iron-based has been successfully carried out. Among them, laser cladding of iron-based alloy powder is suitable for parts that require local wear resistance and are easily deformed. Nickel-based alloy powder is suitable for components requiring local wear resistance, heat resistance, corrosion resistance and thermal fatigue resistance. Cobalt-based alloy powder is suitable for parts requiring wear resistance, corrosion resistance and thermal fatigue resistance. Ceramic coatings have high strength, good thermal stability, and high chemical stability at high temperatures, and are suitable for parts requiring wear resistance, corrosion resistance, high temperature resistance, and oxidation resistance. B and Si play revolutionary role in self-fluxing alloys: ⑴Lower alloy melting point ； ⑵Deoxidize during the melting process to purify the cladding layer ； ⑶The deoxidation process releases heat ； ⑷The unburned B and Si play the role of solid solution strengthening and precipitation strengthening in the alloy.