Tribological behaviour of alumina sliding against Ti6Al4V in unlubricated contact

摘要: Abstract Tribological behaviour of alumina balls (99.5%) sliding against a Ti6Al4V disc over range loads (5–80 N) and speeds (0.0625–1 m s −1 ) has been investigated using pin-on-disc tribometer under unlubricated conditions. The maximum wear coefficient was observed to be several orders magnitude higher than the reported value for or steel counterfaces. When load speed increased, rate ball increased initially then decreased, showing typical transition features. On other hand, friction coefficients Ti6Al4V/alumina tribosystem were found increase inversely with applied speeds. mechanisms based on examinations worn surfaces as well debris SEM, XRD XPS, it revealed that tribochemical mechanism accounted high titanium alloy.