To verify the microstructure and properties of laser cladding tungsten carbide nanometer layer

In tungsten carbide, carbon atoms embedded in the gap of the tungsten metal lattice do not destroy the original metal lattice and form interstitial solid solution, so it is also called interstitial compound. Tungsten carbide can be prepared by heating a mixture of tungsten and carbon at high temperatures, and the presence of hydrogen or warp accelerates the reaction. If the oxygen-containing compound of tungsten is used for preparation, the product must eventually be vacuumed at 1500℃ to remove the oxycarb. Tungsten carbide is suitable for machining at high temperature. It can be used to make cutting tools, structural materials for kilns, jet engines, gas turbines, nozzles, etc.
The other compound of tungsten and carbon is ditungsten carbide, the chemical formula is W2C, the melting point is 2860℃, the cost point is 6000℃, and the relative density is 17.15. Its properties, production method, use with tungsten carbide.
The experiment of laser cladding nanometer WC powder on 2Cr13 stainless steel substrate was carried out by using 7KW cross flow CO2 laser. The microstructure and properties of the layers were examined by scanning electron microscopy (SEW), X-ray diffraction (XRD) and X-ray energy dispersive spectroscopy (EDAX) microhardness tester. The results show that the compact composite layer can be obtained by laser cladding the nanometer WC powder. The cladding area of the layer shows the typical CELLULAR dendrites of Fe and the interdendrites of FE-C-W. XRD analysis shows that the composite layer is mainly composed of Fe, WC, W2C and Fe3C. The performance test results of the layer show that the surface hardness is 1750HV. The average hardness of the cladding layer is 1200HV, and the wear resistance is 2.5 times higher than that of the matrix.
The valve is one of the largest and wide main basic components in the mechanical industry, the valve in the frequent opening and closing process, its sealing surface by scratch, coupled with the medium of corrosion, erosion and high temperature and other factors, and make the valve sealing surface premature damage, become sealing lax, one of the causes of leakage.
Using HVOF spraying cobalt base tungsten carbide powder or nickel base tungsten carbide powder and chromium base tungsten carbide powder hardness can reach HV1200 high temperature resistance 850 degrees, so that valve parts, wear resistance, corrosion resistance, high temperature resistance, oxidation resistance. More than manual surfacing, chromium plating, carburizing, tempering, technology, the production efficiency can be increased by more than two times, the production cost can be reduced by more than 50%, the service life can be extended by tens of times.
Examples of tungsten carbide layer spray components: gate, seat, spool, plunger, ball, flange, stem.
Our cooperative manufacturer is a high-tech enterprise specialized in the research and development, production and sales of wear-resistant spraying tungsten carbide alloy, tungsten carbide coating, tungsten carbide spraying, tungsten carbide powder, tungsten carbide electrode materials, as well as various anti-wear technical services. The comprehensive properties of tungsten carbide produced have reached the international advanced level. The company’s products with its excellent cost performance has been widely recognized by the metallurgy, cement, mining, thermal power, glass and other industries. Our company can process and make tungsten carbide according to customer’s drawings.
The main product tungsten carbide has the characteristics of high wear resistance, good impact resistance, strong deformation ability and good weldability, easy to process and join, easy to install and use, with a high cost performance. Products have been widely used in cement, power, mining, coal, metallurgy, building materials, water conservancy and waterway dredging and other industries wear parts.

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