| Friction is common in daily human life and production activities.Friction has two sides;on the one hand,it is an indispensable favorable factor in life,such as walking,car traction,etc.;On the other hand,it can cause damage to labor tools.Triboelectrification is a physical phenomenon in which materials are charged when they are rubbed,and this static charge will produce discharge to a certain extent,there are potential safety hazards in production activities.In addition,through the collection and utilization of the energy generated by triboelectrification,it has great development potential and application prospects in solving energy problems,self-powered sensing and friction condition monitoring.Therefore,the study of triboelectricity and tribology are becoming more and more important.In this thesis,the correlation between triboelectrification and tribological behavior is carried out.And the triboelectrification and tribological behavior of the friction pair interface in the dry friction state,the lubricating oil state alone and the lubricated state of lubricating oil doped with additives are explored,and the application of tribology and triboelectrification in energy harvesting is explored.(1)The influence of different lubrication states on the tribology and triboelectrification behavior of steel-polytetrafluoroethylene(PTFE)under reciprocating sliding mode was systematically studied by coupling commercial friction and wear tester with the current amplifier.The author uses the friction interface electron flow to explain the mechanism of the phenomenon that the induced current of steel sheet and PTFE film exhibits a bimodal shape of positive and negative alternation under linear reciprocating motion.Hexadecane-Onion like carbon lubricant causes the triboelectric signal to increase and frictional wear decreased,because the nano-onion carbon acts as a "micro-bearing" in the gap of the contact interface,and the rolling effect of the micro-bearing can reduce the friction wear on the surface of the friction pair while further inhibiting the transfer of materials,increasing the actual contact area between steel and PTFE and increasing triboelectric output.(2)The effects of different liquid lubricants on the tribology and triboelectrification of different friction pairs were studied.The study found that the better the wettability and fluidity of the lubricant,the more conducive it is to increase the triboelectric output.This is due to lubricating oil with good wettability and flowability,can transfer the newly generated frictional charge more quickly to the position where there is no frictional charge,thereby increasing the charge density of the friction interface.At the same time,the study of lubricating oil additives found that the addition of suitable spherical nano-additives to lubricating oils with good wettability and fluidity will cause further increase of triboelectric signals and further reduce the frictional wear of friction pairs.Therefore,choosing suitable lubricants and nano additives can reduce wear while making the triboelectric output larger and smoother.(3)The application of interfacial Hexadecane-onion like carbon lubrication in the actual mechanical friction pair(steel-PTFE)of rotary sliding mode is explored.It is found that steel-PTFE can significantly increase the electrical output and reduce wear under the hexadecane-onion like carbon lubrication in the rotary sliding mode,and can optimize the friction performance while maintaining the current output for a long time.This electrical output can be used to successfully light the LED bulb.Therefore,this lubricant can provide a new way of thinking about the actual mechanical movement to harvest electrical energy and reduce wear. |
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