Friction And Wear Analysis Of Tin- Based White Metal ZSnSb8Cu4

Babbit alloy is a kind of high property bearing-material. These alloys present good resist adhesion properties, good wear resisting, corrode-resist properties and well conform-embed properties. Since the excellent properties of Babbit alloy, it is widely used in aviation, electricity, auto industry, energy etc. The failure of Babbit alloy causes huge losses to the related industries. Therefore, the study on tribology behaviors and properties of Babbit has important value.In this paper, tribological behaviors of Babbit alloy ZSnSb8Cu4 sliding against 45 steel under different conditions were investigated. The tribological properties was investigated with Plint TE92 wear-test machine. The micromor-phologies, microstructures, chemical composition, phase galling morphology and element types were tested by the SEM, EDS, XRD and White Light Interferometer. This paper focuses on the use of XRD analysis of the worn surface of Babbit alloy phase. The surface morphology and phase were tested by SEM and BSE.The experiment results show that Babbit alloy presented good wear resisting property. The friction coefficient and wear rate remained low and stable under lubrication. A smooth, dense layer of Cu6Sn5 was generated on the surface of Babbit alloy during the friction. The Cu6Sn5 layer improved the wear resisting property by increasing the surface hardness and reducing the actual contact area. And it is conductive to the formation of oil film stability. High load, high sliding velocity, high temperature could accelerate the formation of Cu6Sn5 layer. The wear resisting property of Babbit alloy will get better by oil film formed at a high sliding velocity. But the failure of Babbit alloy will occur by the damage of Cu6Sn5 layer at a temperature above 150℃. So high load and high sliding velocity improved the wear properties of Babbit alloy at a temperature below 150℃ for the special wear mechanisms of Babbit alloy. The friction coefficient and wear rate kept high under dry sliding condition. The main wear mechanisms were abrasive wear, adhesive wear and material flow by thermal-softening and creep. In conclusion, high temperature and dry sliding must be avoided at the actual working conditions. And the wear resisting property will be improved by increasing load and sliding velocity properly.