Performance Study And Preparation Of Different AW & EP Additives For Aviation Lubricating Oil

The lubricating oil is the blood that the machinery operated, it works normally to mobilize confidentially at the necessity of lubricating oil. Performance of lubricating oil are closely related with exertion of additive. The experiences of the lubricating oil and additive are asked to follow the adaptation with the motor in initial stage, than changed to need to widely meet the needs of environmental protection and energy-conservation even more. When mixed with the aviation lubricating oil. the antiwear additive can improve aviation lubricating oil's abilities of extreme pressure, anti-wear and reduce frictional resistance, so as to lengthen the service life of the machine.And boron, it is rewarded as the inactive lubricating element. Since Ebelman and Bouquet synthesized the chemical compound of organic boron at first in 1846, the developing history of organic boron chemistry has had more than 100 years, especially decades recently, organic boron chemical compound get faster development. Abroad, various boric acid ester as a new-type additive receives extensive research and application to production practices widely more and more. Practice shows: The boric acid ester as resisting additive, its greatest advantage is safe and easy to formate. In addition this kind of boric acid ester has fine antiwear and friction reducing performance at extreme pressure besides, even more it has anti-oxidant and resisting at the same time also often, the fine one is rustproof, antiseptic , and nonpoisonous ancorrosivityd without bad smell. There are no such characteristics as alternative to the metal bottom material. So it is a kind of multi-functional lubricating oil additive.But boric acid ester lubricating oil additive exist such poor properties as lubrication, anticorrosivity and hydrolysising stability, which limits its usage at present. The reason is to lack high-performance water-soluble resisting additive. So how to improve hydrolysising stability and tribological properties of boric acid ester additive has became the key to improve performance of the boric acid ester additive of lubricating oil, in order to widen its scope of application.Because of this, this thesis adopt classical esterification law to formate one ordinary boric acid ester and a kind of N-contained boric acid ester, whichare regarded as the research object, to investigate the hydrolysising performance and tribological behaviors of ester additive of boric acid.With the development of the nanometer science technology in 90's of the 20th, nano-tribology as one of its branch has also developed quickly and the research on tribology performance of various organic and inorganic compound nanoparticle have been paid more and more attention. The research on the nanoparticle which is the lubricate additive is becoming more and more. All the researches indicate that nanometer material has a favorable foreground of research and application.But nanoparticles have tremendous surface energy as particle size is miniaturization. The nanoparticle will form congeries as tendency of conglomeration during particles. Nanoparticle will lose it's performance when it deposit in lubricate. Many foreign companies engaged studies and appeared patents for resolving stability, but nanoparticles still occur precipitation in lubricate. We prepared the CuDDP by the method of chemical reduction in water solution after reading lots of document, then we analyzed it by IR and found Cu-S which prove it is CuDDP. This black organic copper salt can disperse well in organic solvent.We analyzed various additive effect on tribology performance of lubricant by comparing wear resistance of BN and CuDDP. We analyzed tribology performance of lubricant and compared the effect on improvement of tribology performance by adding additives into synthetic 20 aviation lubricating oil. We confirmed the best route and parameter of technology to preparing lubricant by orthogonal test and optimizing the best proportion of lubricant. In this paper, the friction-reducing and antiwear behaviors of CuDDP in 20 aviation lubricating oil were investigated using a four-ball machine, and we have tested Pb and WSD. We measured length of wear trace by rule and analyzed surface performance of steel ball bearing by SEM. At last we estimated tribology performance of lubricant according length of wear trace and surface performance of steel ball bearing. We evaluated the results of test and found the optimum proportion of CuDDP in 20 aviation lubricating oil is 5%, BN is 3%. We also found the two additives both enhance the intensity and load of 20 aviation lubricating oil and improve the tribological properties.At last, we made BN and CuDDP composited as lubricant for the first time. The tribological behaviors of the synthetic products as additives in 20 aviation lubricating oil were investigated on a four-ball machine, while the synergistic tribochemical effects of the two additives were explored based on the analyses of the worn steel surfaces by means of SEM. It was found that both the CuDDP and BN as additives functioned to significantly improving the friction-reducing, antiwear, and extreme-pressure properties of the base stock, which was attributed to the formation of a boundary lubricating and protective film composed of iron oxides and B2O3 or of iron oxides, FeS, FeSO4, and FePC>4, by way of the tribochemical reactions among the additives, the atmospheric O2, and the factional pair. The combined additive of the 3% CuDDP and 0.4% OB was more effective to increasing the friction-reducing, antiwear, and extreme-pressure properties of the base stock. It was therefore concluded that the CuDDP and BN had synergistic friction-reducing, antiwear, and extreme-pressure properties actions, which determined the better tribological behaviors of the combined additive than each individual one.