| 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） |
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| Tribological Properties of Graphene in PAO Base Oil |
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KONG Shang1,2, HU Wenjing1,2, LI Jiusheng1
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1.Advanced Lubricant Laboratory, Shanghai Advanced Research Institute, Shanghai 201210, China;2.University of Chinese Academy of Sciences, Beijing 100049, China
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| 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 |
