Abstract
The microstructure of the tin-based babbit obtained by the method of tungsten inert gas welding (TIG) arc brazing was studied by optical microscopy (OM) and X-ray diffraction (XRD). Tribological behavior was investigated by high-temperature friction and wear testing machine (HTFWT), laser scanning confocal microscopy (LSCM), scanning electron microscopy (SEM) and energy-dispersive spectrometer (EDS). It can be found that the higher welding current of the melting tin-based babbit makes it possible to form isomer structure with fine crystals of the cubic SnSb compounds and large star Cu6Sn5 compounds so that a higher hardness can be achieved, and a lower wear rate can be obtained over the entire distance of sliding friction. When the applied load is 2 N, the contact surface is oxidized due to the accumulation of friction heat and oxide, which plays a role of lubricated film. Also, the softer Sn-based solid solution forms obvious furrow under abrasive wear, and the harder SbSn and Cu6Sn5 intermetallic compounds shatter and leave a hole under friction.
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