Experimental study on friction characteristics of cryogenic rolling bearing materials
The friction characteristics of silver(Ag),polytetrafluoroethylene(PTFE)and molybdenum disulphide(MoS2)coat-ings were tested under different contact stresses and different sliding speeds using a high-speed rotary friction and wear tester in an ultra-low temperature liquid nitrogen(LN2)environment.The shape of the wear marks and the main components of the steel discs were analysed using an XM-200 surface morphometer,a JSM-7800F scanning electron microscope(SEM)and an energy spectrometer(EDS),and the friction factors and wear mechanisms of the three coatings were investigated under ultra-low temper-ature environment.The results show that the friction factor of the coated steel discs does not vary much under two speeds(high sliding speed of 2 m/s and low sliding speed of 0.4 m/s),while the friction factor of the uncoated steel discs is influenced by the sliding speed,with MoS2 and PTFE having the best friction reduction effect.The wear of the three coatings increases with increas-ing load for the same operating conditions.The wear resistance of PTFE in the ultra-low temperature environment is poor and the wear amount is higher,while the wear amount of steel/MoS2 coating is the smallest and steel/Ag coating is the second,indicating that both Ag and MoS2 show good wear resistance in the ultra-low temperature environment and the wear amount is smaller.
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