| People has been keeping trying to reduce friction, reduce wear, increase the service lifeof the mechanical device. Scientists put the antifriction additives to the lubricating oil toimprove the anti-wear performance. The applications of inorganic particles are restricted bythere dispersing performance. Nanoparticles has the characteristics such as small size effectand surface effect, as lubricating oil additives in improving lubrcation performance plays avery important role. Nanometer borate lubricant additive has excellent thermal oxidationstability, seal adaptability, anti-corrosion performance, good anti-wear, antifriction andextreme pressure performance, has certain biodegradability, and non-toxic tasteless, ect, andis widely used in gear lubrication, showed the great potential of energy saving andenvironmental protection.There are many preparation methods of nanometer borate,such as grinding method,direct precipitation, in-situ synthesis method, supercritical fluid drying, micro-emulsionmethod. But these methods have shortcomings of high cost, difficult to produce, makingpollution,ect.In this paper, the spherical calcium borate which was well-distributed nano-particlesused as lubricating oil additives had been preparated by hydrothermal synthesis using boricacid and calcium oxide as raw materials. The different hydrothermal temperature, B/Caproportions, concentration and hydrothermal time were studied. The composition andmorphology of samples were characterized by XRD and TEM. The XRD results showed thatunder the condition of120℃to160℃the product was CaB6O10·5H2O,and under thecondition of180℃to200℃the product was Ca2B10O17·5H2O. The spherical calcium boratenanoparticles with diameters of10-20nm had been producted by condition of B/Caproportions for7and concentration of4.9mol/L, with evenly dispersed. Reaction timeinfluence rate of the products, high yield ratio to get the product was5hours and no reunion.Calcium borate nanoparticles modified with oleic acid were prepared. Discussing theeffect on using different surfactant, and good effection had been acheived. The refined oil was produced from a certain percentage of the sample dispersed in lubricating oil with agitationand ultrasonic. The stability and dispersion of lubricants were characterized by standingobservation. And the anti-wear friction properties of lubrication oil was examined by abrasiontester. Compared with no additives of lubricating oil, in additives of lubricating oil increased2901.6N And the results showed nano-CaB6O10·5H2O additive had good dispersion, stabilityand anti-wear friction properties. |
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