• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2022, Vol. 58 ›› Issue (11): 210-219.doi: 10.3901/JME.2022.11.210

• 数字化设计与制造 • 上一篇    下一篇

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一种可实现超滑的混合溶液的摩擦学研究

孟凡杰, 王仲楠, 常秋英, 王智源, 张建文, 耿旭   

  1. 北京交通大学机械与电子控制工程学院 北京 100044
  • 收稿日期:2021-06-13 修回日期:2022-01-19 出版日期:2022-06-20 发布日期:2022-08-08
  • 通讯作者: 王仲楠(通信作者),男,1984年出生,博士,高聘副教授,硕士研究生导师。主要研究方向为智能机械设计理论与微纳米技术,生物润滑以及水凝胶医学应用等。E-mail:zhn.wang@bjtu.edu.cn
  • 作者简介:孟凡杰,男,1997年出生。主要研究方向为精密零部件设计与摩擦学。E-mail:19121306@bjtu.edu.cn
  • 基金资助:
    北京交通大学基本科研业务费专业资金(KMJB120271536)资助项目

Tribological Investigation of a Mixed Solution with Superlubricity Achieved

MENG Fanjie, WANG Zhongnan, CHANG Qiuying, WANG Zhiyuan, ZHANG Jianwen, GENG Xu   

  1. School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044
  • Received:2021-06-13 Revised:2022-01-19 Online:2022-06-20 Published:2022-08-08

摘要: 硼酸是一种弱酸,其化学反应生成的硼酸盐常被用作润滑脂极压添加剂。在本研究中,以硼酸作为添加剂,制备了与甘油聚醚混合形成的水溶液。随后,对混合水溶液的减摩抗磨性能和流变性能等进行试验研究,通过Hamrock-Dowson公式对成膜性能和润滑机理进行了分析,并讨论了溶液浓度,滑动速度,加载载荷,以及甘油聚醚分子量等参数对混合溶液摩擦性能的影响。结果表明:硼酸的加入,在降低了20%甘油聚醚溶液黏度(降低25%)的基础上,获得了稳定的最小摩擦因数为0.004 5。膜厚比的计算结果显示在混合润滑条件下进入了超滑状态。分析发现:硼酸和甘油聚醚在摩擦副表面发生酯化反应,生成的含氨化合物可形成稳定的摩擦化学反应膜,同时随着甘油聚醚浓度的提高,其分子碳链末端的羟基可在摩擦副表面形成更稳定的吸附膜,表现出润滑性能的提升,生成的硼酸盐也可进一步改善抗磨性能。作为提高运动系统能量利用率的有效方法,这种改进的混合溶液的液体超滑对于传统机械工程领域和精密机械结构有着巨大的应用价值。

关键词: 液体超滑, 甘油聚醚, 硼酸, 摩擦磨损, 摩擦化学膜

Abstract: Boric acid, as a weak acid, can generate the borate which is often used as an extreme pressure additive for lubricating grease by chemical reaction. In this study, an aqueous solution mixed with glycerol ethoxylate is prepared using boric acid as an additive. Subsequently, the friction-reducing and wear resistance and rheological properties of the mixed aqueous solutions are experimentally studied. The film-forming properties and lubrication mechanism are analyzed through the Hamrock-Dowson equation, and the solution influence of concentration, sliding speed, applied load, and molecular weight of glycerol ethoxylate on the friction properties of the mixed solutions are discussed. The results show that the addition of boric acid, not only reduces the viscosity of the 20% glycerol ethoxylate solution (25% reduction), but also obtains a stable minimum friction coefficient of 0.0045. The calculated results of the film thickness ratio show that superlubricity is achieved in the mixed lubrication area. The analysis found that boric acid and glycerin polyether undergo an esterification reaction on the surface of the friction pair, and the generated ammonia-containing compound can form a stable tribochemical reaction film. As the concentration of glycerol polyether increases, the hydroxyl group at the end of the molecular carbon chain can form a more stable adsorption film on the surface of the friction pair, showing the improvement of lubricating performance, and the generated borate also further improve the anti-wear performance. As an effective method to improve the energy efficiency of the motion system, the liquid superlubricity of the improved mixed solution has great application value in the field of traditional mechanical engineering and precision mechanical structures.

Key words: liquid superlubricity, glycerol ethoxylate, boric acid, friction and wear, tribochemical film

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