Laser cladding method of composite coating containing spherical tungsten carbide

Abstract

The invention discloses a laser cladding method of a composite coating containing spherical tungsten carbide, which is characterized by comprising the following steps of: cleaning a metal to be clad by using acetone to remove oil, and blasting sand onto the metal to coarsen the metal; presetting composite powder containing 5 to 50 percent of 0.5 to 2.0 millimeter spherical tungsten carbide and 50 to 95 percent of an iron or nickel based self-fluxing alloy on the surface of the metal; and performing the laser cladding of the metal by using a CO2 laser. In the laser cladding method of the invention, the spherical form of the tungsten carbide composite coating is unchanged, the wear resistance of the cladding is high, defects such as cracks and air holes are avoided, the production working procedures are simple and the working efficiency is high. The method is suitable to be used for metal surface treatment.

Description

technical field [0001] The invention relates to a laser cladding method on a metal surface, in particular to a laser cladding method in which spherical cast tungsten carbide particles are added into powder. Background technique [0002] Wear is one of the main forms of failure (wear, corrosion and fatigue) of mechanical parts. According to incomplete statistics, 1 / 3 to 1 / 2 of energy is consumed in friction and wear. For materials, about 80% of component failures are caused by wear. [0003] Hard facing materials are used as surface engineering materials. By using laser, flame, plasma and other methods, hard facing materials are clad on the surface of workpieces, which can significantly improve the wear resistance, corrosion resistance and oxidation resistance of workpieces, and prolong the service life of workpieces. The characteristics of laser energy density, good power controllability, rapid heating and cooling, etc., make laser surface modification or cladding have uniq...

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Problems solved by technology

[0007] The above-mentioned patented laser cladding method can obtain a tungsten carbide cermet wear-resistant layer on the metal surface, but during the cladding process, due to the rapid heating and cooling of the material, the binder or carbon ink is easy to remain on the cladding layer , making the cladding layer prone to porosity and even cracks, which directly affects the quality and application of the cladding layer

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