A Study On Preparation And Lubricative Behavior Of Nano Potassium Fluoroborate As Lube Additive

Adding additives into oil to reduce friction and wear and to mend the wear surface has been widely applied in all kinds of lubrication of quite a long time. In the past few years, the emergence of nano-materials has provided a new choice. For the development of lubricant additive, Nnao-particles have small dimension effect, quanta dimension effect, surface effect and macroscopical quanta tunnel effect, so they manifest a series of specific physical and chemical characters. Nano potassium fluoroborate exhibit many specific characteristics such as high active, innocuity and pollution-free. The results indicated that the nano potassium fluoroborate has modified the lubricating performance strikingly.In the thesis, the preparation, lubricating behavior and dispersing stability of the lube oil additive have been studied, moreover, the new applied examination of the additive is also discussed.1. The examination has adhibited by mechanical-chemical modification method. Using commercial KBF4 powders as raw materials,120 hour later, the nano potassium fluoroborate has been made respectively by optimizing ball milling process and surfactant. At the same time, chemistry form and crystal frame of nano potassium fluoroborate are not change.2. The results indicated that the antiwear and friction-reducing performance of base oil can be obviously enhanced by dispersing a proper nano potassium fluoroborate into the base oil. It has been found from the analyses of SEM, AES and XPS that in the friction process the fluoborate nanoparticles can form not only absorbing film but also B2O3 deposition film and FeF2 permeating layer on the friction surface by the tribochemical reaction. It is the films that modify the lubricating performance.3. Based on the probing of the dispersing behavior of the nano potassium fluoroborate in the oil, mechanism of agglomeration and dispersing stability, the optimum dispersing method, dispersant as well as its added way and quantity have been found. A more uniform and stable colloidal suspension consisting of base oil and fluoborate nanoparticles is prepared. The results indicated that the novel method not only simplified the process, and improve the dispersion stability of the prepared Nano potassium fluoroborate particles in the lubricant. By adding 0.8 wt.% surfactant,0.1 wt.% electrolytes, and 0.1 wt.% macromolecule could enhance the dispersion stability significantly.4. Nano potassium fluoroborate as lubricant additive has possessed strikingly lubricating performance and excellent dispersing stability which was synthesized by mechanical-chemical modification method. It is shown that the grease has been added nano potassium fluoroborate which is non-corrosive. The additive can improve the extreme pressure performance of grease.In this thesis, A new type nano potassium fluoroborate lubricating oil were studied which have outstanding properties of friction reduction, anti-wear and anti-press. It possesses broadly developing prospect.