Research on Antifriction Performance of Copper Doped Carbon Quantum Dots in a Wide Temperature Range
To improve the friction performance of mechanical system in a wide temperature range,taking copper gluco-nate and diethylenetriamine as raw material,copper doped carbon quantum dots(Cu-CQDs)was synthesized with one-step hydrothermal method.Cu-CQDs was dispersed into PAO base oil,and the tribological properties of the oil sample con-taining Cu-CQDs were studied in atmospheric environment and at different temperatures(25 ℃,100 ℃,200 ℃,300 ℃).The results were compared with those of the oil sample containing zinc dialkyl dithiophosphate(ZDDP).The results indi-cate that Cu-CQDs and ZDDP can increase antifriction and wear resistant properties of PAO base oil,but the performance of Cu-CQDs is superior to that of ZDDP.Especially at 300 ℃,the oil sample containing Cu-CQDs has the most obvious antifriction and wear resistant advantages,its average friction coefficient decreases by 51％compared to PAO base oil and by 11％compared to oil sample containing ZDDP.The high temperature friction mechanism of Cu-CQDs was analyzed.It is found that Cu-CQDs undergoes complex frictional chemical reaction on the surface of the friction pair during high-temper-ature friction,generating a series of metal oxides,carbides,and other frictional chemical products.These substances form a protective layer on the surface of the friction pair,which has the effect of relieving the contact and friction of friction pair.
carbon quantum dotscopper dopinglubricating additivewide temperature rangeantifriction performance
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