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采用超声直接剥离工艺,在二甲基亚砜中对膨胀石墨进行剥离处理制备出少层石墨烯,并对其结构进行表征和分析。将该少层石墨烯作为润滑添加剂添加到去离子水中,使用MFT-R4000型多功能往复摩擦磨损试验仪对其摩擦学性能进行测试,利用三维形貌测量仪、扫描电子显微镜、能谱仪和X射线光电子能谱等手段分析了磨损表面的形貌、元素组成及典型元素的化学状态。结果表明:该工艺制备出的纳米量级少层石墨烯作为去离子水添加剂,具有良好的减摩抗磨性能,并使摩擦副在去离子水润滑下的磨损机理发生改变,由黏着磨损和严重的腐蚀磨损转变为以磨粒磨损为主,但伴随轻微的电化学腐蚀磨损。其主要原因是少层石墨烯片层在磨损表面形成的吸附或沉积膜、少层石墨烯的层间滑动以及磨损表面生成的摩擦化学反应膜共同作用。
Abstract：The few-layer graphene was prepared via the exfoliation of the expanded graphite by liquid-phase ultrasonic treatment in dimethyl sulfoxide(DMSO).The microstructure and morphology of the few-layer graphene were characterized.The tribological properties of the few-layer graphene as a deionized water additive were investigated on a model MFT-R4000 multi-functional reciprocating friction and wear tester.The morphology,elemental composition and chemical state of the worn surface were analyzed by 3D laser microscopy,scanning electron microscopy,energy dispersive spectrometry and X-ray photoelectron spectroscopy,respectively.The results indicate that the few-layer graphene prepared exhibits the excellent properties of friction and wear as an additive in deionized water.The few-layer graphene changes the wear mechanism of friction pair lubricated with deionized water,i.e.,the compound wear mechanism of adhesive wear and abrasive wear becomes the main abrasive wear with slight electrochemical corrosion wear.This can be attributed to the formation of adsorption or deposition film and interlayer sliding of the few-layer graphene and the tribochemical reaction film on the worn surface.
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基本信息:
DOI：10.14062/j.issn.0454-5648.2015.04.11
中图分类号:TQ127.11;TE624.82
引用信息:
[1]赵海朝,乔玉林,臧艳,等.液相剥离法制备少层石墨烯及其在去离子水中的摩擦学性能[J].硅酸盐学报,2015,43(04):437-444.DOI:10.14062/j.issn.0454-5648.2015.04.11.
基金信息:
国家自然科学基金(5105397);; 北京自然科学基金(3122031)资助项目
2014-08-16
2014
2015-03-16
2015-01-03
2015
1
2015-04-01
2015-04-01
2015-04-01