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.