Abstract
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.
Highlights
The plain journal bearing (JB) is widely used in compressors, turbines, pumps, electric motors, electric generators, mining ore crushers, etc., because it provides a continuous sufficient lubrication supply to separate the moving parts by generating a hydrodynamic pressure between the journal and the shaft [1,2,3]
The ore cone crusher suffers from damage due to insufficient lubrication and severe wear, which mostly occurs on the surface of the eccentric JB
It can be seen that the average surface roughness (Ra) of the specimens was reduced significantly after ultrasonic nanocrystalline surface modification (UNSM) treatment, which was found to be 0.26 and 0.14 μm for the untreated and significantly after UNSM treatment, which was found to be 0.26 and 0.14 μm for the untreated and UNSM-treated specimens, respectively
Summary
The plain journal bearing (JB) is widely used in compressors, turbines, pumps, electric motors, electric generators, mining ore crushers, etc., because it provides a continuous sufficient lubrication supply to separate the moving parts by generating a hydrodynamic pressure between the journal and the shaft [1,2,3]. Improving the friction and wear behavior, load capacity, and extending the service life are the most important factors in designing JBs, in order to improve the efficiency and to reduce the number of replacements. The ore cone crusher suffers from damage due to insufficient lubrication and severe wear, which mostly occurs on the surface of the eccentric JB. The main purpose of the Babbitt metal eccentric is to provide a low friction to support and guide a rotating shaft of the ore cone crusher [4]. The Babbitt metal offers a low friction coefficient and can be operated reliably with a continuous pressurized supply of lubricant, it still suffers from damage due to continuous running time in mining and industrial environments.
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