Authors: I.N. Ganiev, R.Z. Mahmadulloev, Kh.M. Khojanazarov, H.O. Odinazoda

Title of the article: Influence of bismuth on the thermal physical properties and changes in the thermodynamic functions of lead babbit B(PbSb15Sn10)

Year: 2024, Issue: 5, Pages: 40-49

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

Index UDK: 669.45.018.8.24/884

DOI: 10.26730/1999-4125-2024-5-40-49

Abstract: One of the most important physical properties of lead babbitt is heat capacity. The paper presents the results of a study of the temperature dependence of the specific heat capacity and changes in the thermodynamic functions of lead babbitt B(PbSb15Sn10) doped with bismuth in the “cooling” mode in the range of 298.15–550 K. For this purpose, computer processing of cooling rate curves for samples of lead babbitt B(PbSb15Sn10 ) with bismuth and the standard, polynomials were obtained that describe their cooling rates. Further, based on the experimentally found values of the cooling rates of the alloy samples and the standard, knowing their masses, their polynomials for the temperature dependence of the heat capacity, which are described by a four-term equation, were established. Using integrals of specific heat capacity, polynomials for the temperature dependence of changes in enthalpy, entropy and Gibbs energy were established for alloys in the range 300-550K. The obtained dependences show that with increasing temperature and bismuth concentration, the heat capacity, enthalpy and entropy of the alloys decrease slightly.

Key words: lead babbit B(PbSb15Sn10) bismuth "cooling" mode heat capacity heat transfer coefficient enthalpy entropy Gibbs energy temperature dependence

Receiving date: 19.07.2024

Approval date: 29.09.2024

Publication date: 24.10.2024

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