Authors: I.N. Ganiev, Kh.M. Khojanazarov, Sh.Kh. Saidov, A.V. Amonova

Title of the article: Temperature dependence of thermal capacity and changes in thermodynamic functions of lead babbitte B(PbSb15Sn10) alloyed with gallium

Year: 2025, Issue: 3, Pages: 91-100

Branch of knowledge: 2.6.1 Metal science and heat treatment of metals and alloys

Index UDK: 669.45.018.8.24/884

DOI: 10.26730/1999-4125-2025-3-91-100

Abstract: Lead-based babbitt, which has high thermal conductivity and excellent compliance, is commonly used by manufacturers in applications that will be subject to impact loads. Some lead-based babbitt products have a uniform grain structure, so they can be used for heavy loads at low constant speeds. Lead-based babbitt is an economical alloy because it can be used for general-purpose machinery, line shafts, and machine shops. It can also be used in agricultural machinery, cement equipment, conveyors, elevators, and metallurgical equipment. The thermodynamic and thermal properties of lead and its alloys are the subject of numerous experimental and theoretical studies. The 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. The paper presents the results of a study of the temperature dependence of the specific heat and changes in the thermodynamic functions of lead babbitt B(PbSb15Sn10) alloyed with gallium in the "cooling" mode in the range of 298.15–550 K. For this purpose, polynomials describing the cooling rates of lead babbitt B(PbSb15Sn10) samples with gallium and the standard were obtained by processing the cooling rate curves of the samples. Further, according to the experimentally found values ​​of the cooling rates of the standard and the samples from the alloys, knowing their masses, polynomials of the temperature dependence of the heat capacity of the alloys and the standard were established, which are described by a four-term equation. Using integrals of specific heat capacity, polynomials of temperature dependence of changes in enthalpy, entropy and Gibbs energy for alloys were established. The obtained dependencies show that with increasing temperature and gallium concentration, heat capacity, enthalpy and entropy of alloys increase, and the values ​​of Gibbs energy decrease.

Key words: lead babbitt B(PbSb15Sn10) gallium “cooling” mode heat capacity heat transfer coefficient enthalpy entropy Gibbs energy temperature dependence

Receiving date: 22.11.2024

Approval date: 10.06.2025

Publication date: 26.06.2025

CITE DOWNLOAD