Tribological Properties of Fe-Ni Matrix Solid Self-lubricant Composite at High Temperature

Property has generated immense attention. The tribological behaviors of self-lubricating composite containing PbO and WS₂ in sliding against 440C stainless steel were evaluated at temperatures ranging from 25 to 600℃. Chromium sulfides were found in the composite at elevated temperature by XRD. The worn surface of the composite was examined by using scanning electron microscope and metallographic microscope. The results reveal that an intact lubricant film composing of PbWO₄ and Cr_xS_x+1 - type eutectic compound formed on the friction surface at 500~600℃. Wear type of tested composite material/440C stainless steel was the transfer of the lubricant film to the surface of 440C stainless steel, making the friction coefficient of material sharply lower. This paper further explore the difference of the bearing capacity of the lubricant films generated by the single lubricating element and two lubricating elements. It is found that synergetic lubricating effect of two lubricating elements significantly improved the tribological property.