Ganiev Izatullo Navruzovich, Muzafarov Khusrav Davlyatalievich, Ismonov Rustam Dovudovich, Khojanazarov Khayrullo Mahmudkhonovich

Annotation:

This article examines the microstructure and mechanical properties of solid babbit grade B83 with the addition of thallium. Babbit B83 is a tin (Sn)-based alloy, usually containing antimony (Sb) and copper (Cu), and is widely used for sliding bearings. The introduction of thallium (Tl) as an alloying element contributes to a change in the phase composition and internal structure of the solid components in the soft babbit matrix. The results of metallographic studies have shown that in the initial structure of babbit B83, solid intermetallic phases of the SnSb and Cu6Sn5 types are distributed in the α-Sn matrix. The addition of thallium leads to grain grinding, leveling the distribution of solid phases and reducing their size. An improvement in the bearing capacity and an increase in the structural stability of babbit B83 is observed with the introduction of thallium. Mechanical tests have shown that with optimal thallium content, hardness and wear resistance increase, while plasticity remains at an acceptable level. In addition, there is a decrease in the tendency to form microscopic cracks at grain boundaries, which has a positive effect on the durability of bearings. Thus, alloying solid babbit B83 with an optimal amount of thallium improves the microstructure and mechanical properties and is recommended for use at high speeds and heavy loads.

Keywords: tin-based babbitt B83; thallium; microstructure; intermetallic phases; α-Sn matrix; SnSb; Cu₆Sn₅; grain refinement; hardness; wear resistance; mechanical properties; sliding bearings