DOI: 10.18503/1995-2732-2023-21-2-85-101
Abstract
In this research, a W-Au coating with a thickness of 120-190 µm was obtained on a copper substrate using combined processing. The paper presents a novel study on structural phase states and properties of electroerosion-resistant coatings on copper electrical contacts of the W-Au-N system. A transition zone enriched with gold atoms was formed at the interface between the coating and the substrate. It was shown that gold atoms penetrate into the substrate, forming extended interlayers along the boundaries of copper grains, which indicated the fusion of the coating and substrate. The X-ray microanalysis revealed tungsten islands in the gold layer, which indicated a non-uniform elemental composition of the coating. The X-ray phase analysis revealed a multiphase composition of the coating: W, Cu128Au272, Au0.2Cu0.8, and Cu0.25Au0.75. The methods of transmission electron diffraction microscopy additionally established the formation of particles of copper nitrides and tungsten nitrides, whose sizes varied within 7-20 nm, in the coating. It has been established that the average value of microhardness varies from 1.1 to 1.29 GPa and decreases with distance from the coating surface. Young’s modulus changes in a similar way: it decreases with distance from the surface to the interface between the coating and the substrate. It is shown that the coating wear parameter is 1.3·10-6 mm3/N·m, which is over 56 times less than the copper wear parameter. The coefficient of friction of the coating is 0.3, which corresponds to the coefficient of friction of the substrate. It can be assumed that the high tribological properties of the formed coating are due to nanosized particles of nitride phases. The method studied by us allows us to expand the data bank of physical processes and formation mechanisms of structural phase states and properties of electroerosion-resistant coatings on copper electrical contacts of the W-Au-N system using electro-explosive spraying, electron beam processing and nitriding. The research is aimed at obtaining the Au-W coating on the copper substrate, studying its physical and mechanical properties, and structural and phase composition after exposure to an electron beam and nitriding.
Keywords
low-energy pulsed electron beam, nitriding, gold, tungsten, copper
For citation
Pochetukha V.V., Romanov D.A., Vashchuk E.S., Filyakov A.D., Ivanov Yu.F., Gostevskaya A.N. Structure and Properties of Coatings Based on Tungsten, Gold and Nitrogen Obtained on a Copper Substrate by an Integrated Electrophysical Method. Vestnik Magnitogorskogo Gosudarstvennogo Tekhnicheskogo Universiteta im. G.I. Nosova [Vestnik of Nosov Magnitogorsk State Technical University]. 2023, vol. 21, no. 2, pp. 85-101. https://doi.org/10.18503/1995-2732-2023-21-2-85-101
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