INFLUENCE OF ZINC ADDITIVES ON THE TEMPERATURE DEPENDENCE OF HEAT CAPACITY AND CHANGES IN THERMODYNAMIC FUNCTIONS OF LEAD-ANTIMONY ALLOY CCU3

The lead-based alloy has a high thermal conductivity and meets the requirements for shock loads imposed by consumers. Some lead-based alloy products have a uniform granular structure, so they can be used at high loads at low constant speeds. The most important physical characteristics of a lead alloy are the heat capacity and thermodynamic functions. The thermodynamic and thermophysical properties of lead and its alloys are the subject of numerous experimental and theoretical studies. Available experimental data include measurements of heat capacity, enthalpy, entropy and Gibbs energy at normal pressure in the temperature range of 298.15 – 550 K. In the present work, the specific heat capacity and thermodynamic functions of the lead-antimony alloy CCu3 doped with zinc were determined in the "cooling" mode by the known heat capacity of the reference sample made of lead grade C00. By working out the curves of the cooling rates of samples from the alloy SSu3 with zinc and the reference, polynomials describing their cooling rates were obtained. Using the cooling rate of the studied samples and the standard and their mass, the specific heat capacity of the lead-antimony alloy CCu3 with zinc was calculated depending on the temperature. It is shown that with increasing temperature and zinc content, the heat capacity, enthalpy and entropy of alloys increase, and the Gibbs energy value decreases. With an increase in the zinc content, the heat capacity and Gibbs energy of the alloys increase. Zinc additives have a negligible effect on changes in the enthalpy and entropy of the CCu3 alloy.

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