引用本文:孔尚,胡文敬,李久盛.石墨烯在PAO基础油中的摩擦学性能[J].中国表面工程,2019,32(3):162~169
KONG Shang,HU Wenjing,LI Jiusheng.Tribological Properties of Graphene in PAO Base Oil[J].China Surface Engineering,2019,32(3):162~169
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石墨烯在PAO基础油中的摩擦学性能
孔尚1,2, 胡文敬1,2, 李久盛1
1.中国科学院上海高等研究院 先进润滑材料实验室, 上海 201210;2.中国科学院大学, 北京 100049
摘要:
为了改善石墨烯在润滑油中的分散稳定性，利用一种高分子量丁二酰亚胺（分散剂A）辅助石墨烯分散于聚α-烯烃（PAO4）基础油中，采用紫外-可见分光光度法对其分散稳定性进行了监测，并使用UMT-3多功能摩擦试验仪和ContourGT-K型三维轮廓仪考察了石墨烯/PAO4分散液的摩擦磨损性能，利用扫描电子显微镜（SEM）、能谱仪（EDS）和X射线光电子能谱（XPS）对磨痕表面的形貌和元素组成进行定性和定量分析。结果表明：分散剂A可有效提高石墨烯在PAO4中的分散稳定性，加入分散剂A后，石墨烯/PAO4分散液静置一周后的相对浓度为0.667，是未加分散剂的分散液的7.8倍；石墨烯作为润滑油添加剂能显著提升摩擦磨损性能，添加0.8 mg/mL的石墨烯和质量分数为0.2%的分散剂A，跑合期从670 s缩短至250 s，磨损体积减少了55%。
关键词:  石墨烯  分散性  摩擦学性能  跑合期
DOI：10.11933/j.issn.1007-9289.20190102001
分类号:TG115.58
基金项目:山西省科技厅重大专项国际合作项目（GJ2016-01）
Tribological Properties of Graphene in PAO Base Oil
KONG Shang1,2, HU Wenjing1,2, LI Jiusheng1
1.Advanced Lubricant Laboratory, Shanghai Advanced Research Institute, Shanghai 201210, China;2.University of Chinese Academy of Sciences, Beijing 100049, China
Abstract:
To improve the dispersibility of graphene in lubricating oil, a high molecular weight succinimide (dispersant A) was used as dispersant to assist the graphene to disperse into PAO4 base oil steadily. The dispersibility was characterized by UV-Vis spectroscopy, and the tribological properties of graphene/PAO4 dispersion were investigated by UMT-3 Tribological Tester and ContourGT-K 3D Profiler. Scanning electron microscopy (SEM), energy spectrometer (EDS) and X-ray photoelectron spectroscopy (XPS) were used to observe and evaluate the morphology and elemental composition of the wear scar surface, respectively. The results show that dispersant A can effectively improve the dispersibility of graphene in PAO4. When dispersant A is used, the relative concentration of graphene/PAO4 laid aside for one week is 0.667, which is 7.8 times that of the disperse system without dispersant A. Graphene, as a lubricating oil additive, can significantly reduce the friction and wear. When 0.8 mg/mL of graphene and 0.2% of dispersant A are added, the running-in period decreases from 670 s to 250 s, and the wear volume reduced by 55%.
Key words:  graphene  dispersibility  tribological property  running-in period
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