Tribological Tests
Synthesized ionic liquids were analyzed for their tribological performance using four-ball tribotester (Stanhope-Seta, UK) by blending with base fluid varying concentration from 0.2 to 1.2 wt%. The antiwear behaviour was examined as per the method ASTM D 4172 at 40 kg load and 1200 rpm for 60 min at 60-70 ºC at different additive concentrations. At the end of each test, the lower three balls were washed with hexane and ether and air dried for 15 min. The scar on balls was measured with Mitutoyo toolmaker’s microscope and the average of three measurements was taken as mean wear scar diameter (MWD). The load carrying capacity of ionic liquids blended base oil was analyzed as per the method IP 239 at 1475 rpm and time duration 60 sec. The analysis was carried out twice and the average of two values was reported.