Khojanazarov Khayrullo Mahmudkhonovich, Ganiev Izatullo Navruzovich, Saidov Shohin Khudoydodovich, Ismonov Rustam Dovudovich

Annotation:

The paper considers the results of studying the oxidation kinetics of lead babbitt B(PbSb15Sn10) with gallium in the temperature range of 373–473 K, the resulting oxidation products of the alloys and their microstructure. The studies were carried out by the thermogravimetric method in air at atmospheric pressure in the temperature range of 373–473 K. It was found that the oxidation process in the entire studied temperature range can be described with high accuracy by a fourth-degree polynomial. The experiments noted a periodic change in the oxidation rate over time. The kinetic and energy parameters of the oxidation process of the alloys were determined. It was found that gallium additives increase the oxidizability of the original alloy B(PbSb15Sn10). It is shown that additives of the alloying component significantly change its microstructure. The X-ray diffraction method revealed that the oxidation products of the alloys consist of oxides: PbO, Pb₃O₄, Pb₂(SnSb)O_6.5, Sb₂O₅, PbSb₂O₆, Pb₂SnO₄, Ga₂O₃.

Keywords: oxidation kinetics, babbitt B(PbSb15Sn10), gallium activation energy, oxidation rate constant, microstructure, X-ray diffraction.