Friction and lubrication mechanism of a new type of anti-magnetic bearing Ti60 titanium alloy material

Abstract

The tribological characteristics of Si3N4 ball sliding against a Ti60 disc lubricated by an as-synthesized ionic liquid (IL), perfluorooctane sulfonate phosphonium (L-4P), were studied using an oscillating reciprocating friction and wear tester at 50 and 150 °C. The scanning electron microscopy (SEM), friction test results by XRV-5, Energy Dispersive Spectrometer (EDS) and X-ray photoelectron spectroscopy (XPS) results show that the excellent tribological characteristics of Si3N4/Ti60 contacts lubricated by (L-4P) has excellent tribological characteristics. The friction surface of Ti60 against Si3N4 by lubricated with pentaerythritol ester (5750), diisooctyl sebacate (DIOS) and 1-butyl-3-methylimidazolium tetrafluoroborate (L-[BMIM][BF4]) are ploughing wearing, and the dominant wear mechanism are mainly abrasive particles wear, accompanying oxidation wear. As opposed to friction surface of L-4P is ploughing wearing with a lot of molten SnF2, and the dominant wear mechanism is mainly adhesive particles wear, accompanying abrasive wear and oxidation wear. A soft and low melting-point phase SnF2 generated due to chemical reaction between Ti60 and L-4P further lubricate the friction pairs, resulting in the best wear performance. Keywords: Phosphonium ionic liquid, Si3N4/Ti60, Titanium alloy, Tribological characteristics