A METHOD OF MEASURING THERMOPHYSICAL PARAMETERS OF METALS WITH THIN COATINGS APPLIED BY GALVANIC METHOD IN A MAGNETIC FIELD OF LOW INDUCTION

The work is devoted to the development of a measuring method of the thermal characteristics of metals with thin coatings applied by galvanic method on the base metal, for use in thermal equipment of renewable energy sources. Designed and manufactured laboratory equipment for measuring the thermal characteristics of metals with thin coatings and thin coatings applied to the base material. A study was conducted to determine thermal conductivity and heat capacity on the example of a nickel coating applied to a copper base by galvanic means in a magnetic field of low induction. The calculation results showed that the thermal conductivity of the coated base is 326 W/(m×°К) and is lower than the thermal conductivity of the copper base (394 W/(m×°К)). This is due to the fact that nickel has a much lower thermal conductivity than copper. In addition, an additional transition layer is formed at the copper-nickel interface, which can also impair thermal conductivity. The heat capacity of nickel-plated copper was 0.4285 kJ/(.kg·°K) and is greater than the heat capacity of pure copper. In general, a copper base with a protective nickel coating has good thermal characteristics and can be used in heat-conducting equipment. The method proposed in this paper allows to determine the thermal characteristics of metals with thin coatings and coatings applied electrochemically on a heat-conducting base, and to determine the possibility of their use in heat-conducting equipment.