Abstract:The analysis of the properties of babbitt bushes is presented in this article. Materials intended for examinations were charged from the TK-120 steam turbine of TG-8 turbosystem from the Power Station Stalowa Wola. The specimens were subsequently tested for Brinell hardness, microhardness, bending strength and wear resistance. The wear tests were carried out using the block-on-ring tester. The samples were also investigated by means of both light microscopy (LM) and scanning electron microscopy (SEM).Keywords:… Show more
“…It is also characterized by good impact strength and shows susceptibility to bending stresses initiated by changes in the direction of rotation and edge pressure [5,6]. The tribological properties of this alloy can be improved, among others, by refinement and changes in the morphology of precipitates present in the alloy, as confirmed by earlier studies done by the authors of this article [5].…”
The results of tribological tests and microstructure examinations of tin babbit with 1.5 % Pb addition after heat treatment are presented in this paper. The specimens were annealed at 150°C for 2, 8, 24 and 48 hours and then tested for wear resistance and Brinell hardness. The wear tests were carried out using a block-on-ring tester operating under dry and wet conditions. The samples were also investigated by light microscopy (LM) and scanning electron microscopy (SEM).
“…It is also characterized by good impact strength and shows susceptibility to bending stresses initiated by changes in the direction of rotation and edge pressure [5,6]. The tribological properties of this alloy can be improved, among others, by refinement and changes in the morphology of precipitates present in the alloy, as confirmed by earlier studies done by the authors of this article [5].…”
The results of tribological tests and microstructure examinations of tin babbit with 1.5 % Pb addition after heat treatment are presented in this paper. The specimens were annealed at 150°C for 2, 8, 24 and 48 hours and then tested for wear resistance and Brinell hardness. The wear tests were carried out using a block-on-ring tester operating under dry and wet conditions. The samples were also investigated by light microscopy (LM) and scanning electron microscopy (SEM).
“…The microhardness of the modified Babbitt was 53% higher than that of the heated Babbitt, which could be attributed to the refined SnSb intermetallic uniformly distributed on the Babbitt matrix. 19 Figure 5.Microhardness of the bare Babbitt, heated Babbitt, and modified Babbitt.…”
Babbitt alloy is a widely used bearing material. In order to improve its thermal and anti-fatigue performance, the combined effect of additive La and heat treatment of tin-Babbitt were studied. The microhardness, wettability, and tribological performances of the Babbitt were first considered. The Babbitt alloy modified with La element (0.1 wt%) was prepared and then heat treatment was carried out (marked by the modified Babbitt). The friction and wear performances of the bare Babbitt, heated Babbitt, and modified Babbitt were conducted by a ball-on-disc tester under oil lubricated condition. The results showed that the microstructure of the modified Babbitt alloy was homogeneous. The cubic phase of SnSb intermetallic was refined and the SnSb cubes were also passivated. The microhardness of the modified Babbitt increased from 24.67 Hv to 37.84 Hv and wettability was improved with the addition La and heat treatment. Therefore, the anti-wear performance of the Babbitt was improved. The modified Babbitt alloy is observed to resist the instant scratching from the journal.
“…In the case of indentation, the smaller the indentation, the harder the material; confirming the increase in the hardness of the UNSM-treated specimen. Leszczynska-Madej and Madej have reported on the mechanism of hardness increase in Babbitt alloys [ 24 ]. They found that the increase in hardness of Babbitt alloys may be attributed to the presence of a hard SnSb phase in the form of squares in the microstructure and the occurrence of fine precipitates uniformly distributed over the whole Sn matrix.…”
An anti-friction Babbitt alloy-coated bearing made by a casting process is a journal bearing, which is used in an ore cone crusher eccentric. The main purpose of the Babbitt coated eccentric is to provide a low friction to support and guide a rotating shaft. Despite the fact that the Babbitt-coated eccentric offers a low friction coefficient and can be operated without a continuous supply of lubricant, it suffers from mining environments and short service life. In this study, an ultrasonic nanocrystalline surface modification (UNSM) technique was used to further reduce the friction coefficient, to increase the wear resistance, and to extend the service life of the Sn-based Babbitt metal. The friction and wear behavior of the Sn-based Babbitt metal was investigated using a block-on-ring tester under both dry and oil-lubricated conditions. The results of the experiments revealed that the friction and wear behavior of Sn-based Babbitt metal could be improved by the application of the UNSM technique. The friction and wear mechanisms of the specimens were explained and discussed in terms of changes in surface properties—microstructure, surface hardness, surface roughness, etc.
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