Synergetic Effect in Ni–P–W and W–C Multilayer Coating Systems Obtained by Chemical-Catalytic Metallization and Chemical-Vapor Deposition

The features of the interface of the W–C system obtained by chemical-vapor deposition and Ni‒P–W layers of various compositions obtained by chemical-catalytic metallization are studied. Ni–P–W layers are used as support layers for coatings of the W–C system to improve the adhesive strength of the applied coatings to steels and resistance to loads directed along the normal to the surface. The methods of scanning electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy are used to study the morphology, and phase and elemental composition of the obtained layers, as well as phase transformations occurring in the layers during heat treatment. Mechanical tests show that Ni–P layers with a low phosphorus content, in terms of their characteristics, demonstrate the best support properties.