Compared with metal ball bearings,full ceramic ball bearings have more outstanding service performance under extreme operating conditions.In order to reveal the oil lubrication characteristics of full ceramic ball bearings and improve the running performance and service life of full ceramic ball bearings.Taking the 6208CE silicon nitride full ceramic deep groove ball bearing as an example,its friction,vibration and temperature rise characteristics under oil lubrication conditions were experimentally studied.The influence of oil supply on the lubrication state of full ceramic ball bearings was discussed,and the surface layer of the contact micro area of the full ceramic ball bearing after the test was analyzed.It is found that in the service process of full ceramic ball bearing under oil lubrication,there is an optimal oil supply under a specific working condition,which can enable the bearings to achieve full film lubrication and exhibit the best characteristics of friction,vibration,temperature rise.Compared to the load,the speed of the bearing has a decisive influence on the value of the optimum oil supply.This research is of some guiding significance for revealing the lubrication characteristics of full ceramic ball bearing oil and enriching its lubrication theory and method.