改性石墨烯对液压油摩檫学性能的影响

采用3种改性方法对5种不同厚度和不同氧化程度的石墨烯进行活性官能团改性，改善其在液压油中的分散稳定性，通过久置试验和离心试验考察改性石墨烯的分散稳定性，采用四球机摩擦试验、氧化安定性试验等考察改性石墨烯对液压油摩擦磨损性能和抗氧化性能的影响。结果表明：低氧化度的少层或多层石墨烯通过KH570和MMA、油胺、油酸3种方法改性后，添加到液压油中的分散稳定性较差；通过油胺和油酸改性的高氧化度石墨烯，在液压油中添加量（w）为0.01%时，可以获得能稳定分散1年以上的油溶性好的改性石墨烯液压油，而且抗磨减摩性能和抗极压性能均明显提高.

EFFECT OF MODIFIED GRAPHENE ON TRIBOLOGICAL PROPERTIES OF HYDRAULIC OIL

Three kinds of modification methods were used to modify the active functional groups of five graphenes with different thicknesses and different oxidation degrees to improve their dispersion stability in hydraulic oil. The dispersion of modified graphenes was investigated through long standing test and centrifugal test. The effect of modified graphenes on the friction and wear performance and anti-oxidation performance of hydraulic oil was investigated by four-ball machine friction test and oxidation stability test. The results showed that after modified by KH570, MMA, oleylamine and oleic acid, the few or multi-layer graphenes with low oxidation degree, had poor dispersion stability when added into hydraulic oil. And the high-oxidation graphenes modified by oleamine or oleic acid, when the added amount was 0.01%, the hydraulic oil obtained good oil solubility with stable dispersion for more than one year. At the same time, anti-wear, anti-friction and extreme pressure performance of hydraulic oil was significantly improved.