李林燃,刘豪,余来贵,张玉娟,张平余,宋宁宁,张晟卯.石墨烯对聚脲脂高温流变和摩擦学性能的影响[J].表面技术,2024,53(5):31-40.
LI Linran,LIU Hao,YU Laigui,ZHANG Yujuan,ZHANG Pingyu,SONG Ningning,ZHANG Shengmao.Effect of Graphene on Rheological and Tribological Properties of Polyurea Lubricating Grease at Elevated Temperature[J].Surface Technology,2024,53(5):31-40 |
| 石墨烯对聚脲脂高温流变和摩擦学性能的影响 |
| Effect of Graphene on Rheological and Tribological Properties of Polyurea Lubricating Grease at Elevated Temperature |
| 投稿时间：2023-02-21 修订日期：2023-09-26 |
| DOI：10.16490/j.cnki.issn.1001-3660.2024.05.003 |
| 中文关键词: 聚脲润滑脂 石墨烯 减摩 抗磨 流变学性能 高温 |
| 英文关键词:polyurea lubricating grease graphene anti-friction anti-wear rheological properties elevated temperature |
| 基金项目:国家自然科学基金项目(52105180);河南省重点研发与推广项目(212102210125);中国博士后科学基金面上项目(2021M690895);河南省高等学校重点科研项目(21A150013);中原科技创新领军人才计划项目(214200510024) |
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| Author | Institution |
| LI Linran | Engineering Research Center for Nanomaterials, Henan University, Henan Kaifeng 475001, China |
| LIU Hao | Engineering Research Center for Nanomaterials, Henan University, Henan Kaifeng 475001, China |
| YU Laigui | Engineering Research Center for Nanomaterials, Henan University, Henan Kaifeng 475001, China |
| ZHANG Yujuan | Engineering Research Center for Nanomaterials, Henan University, Henan Kaifeng 475001, China |
| ZHANG Pingyu | Engineering Research Center for Nanomaterials, Henan University, Henan Kaifeng 475001, China |
| SONG Ningning | Engineering Research Center for Nanomaterials, Henan University, Henan Kaifeng 475001, China |
| ZHANG Shengmao | Engineering Research Center for Nanomaterials, Henan University, Henan Kaifeng 475001, China |
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| 中文摘要: |
| 目的 保证轴承体系的安全性和可靠性，研究轴承润滑脂在不同工作温度下的摩擦学性能和流变学性能。方法 用机械剥离法制备的石墨烯作为聚脲脂的润滑添加剂，通过四球摩擦试验机、旋转流变仪，研究石墨烯在不同工作温度下对聚脲润滑脂流变行为和摩擦学性能的影响，并通过三维轮廓仪、扫描电子显微镜和拉曼光谱仪对磨斑形貌和结构进行分析。结果 添加石墨烯润滑添加剂使聚脲润滑脂的高温硬化现象明显改善，同时提高了聚脲润滑脂的结构稳定性和抗剪切能力。工作温度为75、150 ℃时，与空白聚脲润滑脂相比，含1.0%(质量分数)石墨烯的聚脲润滑脂润滑下的轴承钢摩擦副的摩擦系数和磨斑直径分别降低49%、20%和10%、20%。随着工作温度的升高，含石墨烯的聚脲润滑脂样品在钢滑动表面形成的沉积膜的结构有序化碳的含量稍有下降，但与空白聚脲润滑脂相比，石墨烯-聚脲润滑脂沉积膜的结构有序化碳含量高得多。结论 结构有序化碳的形成对提高基础脂的减摩抗磨性能起至关重要的作用，石墨烯润滑添加剂还可以有效改善聚脲润滑脂的高温硬化性能、胶体稳定性以及稠化剂的结构稳定性。 |
| 英文摘要: |
| With the development of machinery industry, the bearing is required to work under elevated operating temperature and it is of great significance to study the tribological and rheological properties of the bearing grease at various working temperature in order to ensure the safety and reliability of the bearing system. Additives are critical to improve performance of lubricating grease. Herein, the graphene prepared by mechanical exfoliation method was used as the lubricating additive of polyurea lubricating grease, and its effect on the tribological and rheological properties of the polyurea lubricating grease at different working temperature was investigated by a four-ball tribometer and rotational rheometer. The morphology and structure of the wear spot were observed through a three-dimension optical profilometer, scanning electron microscopy and Raman spectroscopy. Findings indicated that, graphene sheets were filled and covered in the three-dimensional network structure of the polyurea thickener, which was beneficial to maintain the structural stability of the thickener. After ageing for 48 h at 150 ℃, the cone penetration (1/4) of the grease increased by 7.3 mm, while that of the grease with 1.0% graphene sheets additives retained almost constant (1.2 mm). The results of rheological tests showed that the structural strength of blank grease decreased at high temperature, while graphene sheets could effectively improve the shear stability resistance. The three-dimensional network structure formed by thickener fibers was easily deformed or even flowed and tended to be oriented under shear stress, while the directional arrangement of thickener fibers of the grease with graphene additives was blocked, so that the strain value of the flow point increased. As compared with blank polyurea lubricating grease, the same grease containing 1.0% (mass fraction) of graphene could reduce the coefficient of friction and wear spot diameter of bearing steel sliding pair working at 75 ℃ and 150 ℃ by 49% and 20% as well as 10% and 20%, respectively. There were many pits and furrows on the worn surface of steel balls lubricated by blank grease at the temperature of 75 ℃, when the temperature rose to 150 ℃, the worn surface became serious peeled off and showed typical adhesive wear characteristics. However, at the temperature of 75 ℃ and 150 ℃, the worn surface of steel ball lubricated with 1.0wt.% graphene-polyurea grease was smooth, which was attributed to the large surface energy of graphene eventually contributing to adsorb on the surface of metal friction pair and form a deposition film composed with carbon and oxygen elements. With the increase of working temperature, the proportion of the ordered structural carbon in the deposited film of graphene-containing polyurea lubricating grease slightly decreases, but the proportion of ordered structural carbon in its deposited film is much higher than that of the blank grease. The formation of the ordered structural carbon plays a key role in improving the friction-reducing and antiwear abilities of the base grease, while the graphene as the lubricating additive also contributes to effectively improving the hardening behavior and colloidal stability of the polyurea grease as well as the structural stability of the thickeners. |
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