In tungsten carbide, the insertion of carbon atoms into the interstices of the tungsten metal lattice does not destroy the lattice of the original metal, forming a interstitial solid solution and therefore also referred to as interstitial (or intercalation) compounds. Tungsten carbide can be obtained by heating a mixture of tungsten and carbon at high temperatures, and the presence of hydrogen or hydrocarbons can speed up the reaction. If tungsten oxygenates are used, the product must eventually be vacuum treated at 1500 ° C to remove the carbon oxides. Tungsten carbide suitable for machining at high temperatures, can be made cutting tools, furnace structural materials, jet engines, gas turbines, nozzles and so on.
Another compound of tungsten and carbon is ditungsten carbide having a chemical formula of W2C, a melting point of 2860C, a boiling point of 6000C and a relative density of 17.15. Its nature, system of law, use the same tungsten carbide.
The experiment of laser cladding nano-WC powder on 2Crl3 stainless steel substrate was carried out by using 7KW cross-flow CO2 laser. The microstructure and properties of the coatings were examined using scanning electron microscopy (SEM), X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDAX) The results show that the dense composite coatings can be obtained by laser cladding of nano-WC powder. The typical Fe-like dendrites and dendritic Fe-CW structures are observed in the cladding region. XRD results show that the composite coating The layer is mainly composed of several phases of Fe, WC, W2C and Fe3C. The coating performance test results show that the surface hardness is 1750 HV. The average hardness of the cladding is 1200HV, and the wear resistance is 2.5 times higher than that of the matrix.