Microstructure and properties of arc sprayed tin-based babbitt coating

The coatings of arc sprayed tin-based alloy was prepared,the coatings and the coating/substrate interface were characterized by scanning electron microscopy,energy dispersive X-ray spectroscopy and X-ray diffraction,some mechanical properties of the coatings were measured,and an effective way to increase the tensile strength of the coatings was mentioned.The results show that the microstructure of arc sprayed tin-based alloy consists of lots of uniform and fine metal deposits and the intermetallic compounds,Cu₆Sn₅ and SnSb in the coatings look like irregular or globular shape;the existence of a bonding layer between the babbitt coating and the cast iron or steel substrate is of benefit to the coating adherence.The coating has a satisfactory performance under the condition of rubbing,which is better than that of cast babbitt.