通过水下电弧放电法制备出洋葱状富勒烯(OLFs).采用高分辨透射电镜(HRTEM)、X射线衍射(XRD)分析了OLFs的晶体结构和形貌,并通过热重(TGA)考察了OLFs的热稳定性.在MRS-10A型四球摩擦试验机上测试了OLFs作为长城牌SE级15W-40汽油机油添加剂的摩擦性能.结果表明,所制备的OLFs具有较高的石墨化程度,直径约25nm,外形呈球状并具有一定的空心结构;在空气中的热稳定性维持到600℃以上.在不同的质量分数和载荷下,OLFs作为润滑油添加剂在减摩性能上均优于碳纳米管(CNTs).
Onion-like fullerenes(OLFs) are prepared by arc discharge in water.High-resolution transmission electron microscopy(HRTEM) and X-ray diffraction(XRD) techniques are used to characterize the morphologies and microstructures of the OLFs.The thermal stability of sample is measured by thermogravimetric analysis(TGA).The OLFs as lu-bricant additives of commercial lubricating oil Great Wall SE 15W-40 are added and the tribological properties are investigated by using a four-ball tester.The results indicate that the OLFs are of high degree of graphitization with a diameter of about 25nm and maintain their structure over 600℃ in air.Compared with carbon nanotubes the OLFs exhibit good frictionreduction properties at different additive mass fraction and applied load as lubricant additive.
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