油酸改性石墨烯/二硫化钼复合材料润滑添加剂的制备及摩擦学特性

doi:10.16085/j.issn.1000-6613.2021-2374

化工进展 ›› 2022, Vol. 41 ›› Issue (9): 4973-4985.DOI: 10.16085/j.issn.1000-6613.2021-2374

油酸改性石墨烯/二硫化钼复合材料润滑添加剂的制备及摩擦学特性

秦建¹(), 刘天霞¹^,²^,³(), 王建¹, 卢星¹

^1.北方民族大学化学与化学工程学院，宁夏银川 750021
^2.宁夏太阳能化学转化技术重点实验室，宁夏银川 750021
^3.化工技术基础国家民委重点实验室，宁夏银川 750021

收稿日期:2021-11-18 修回日期:2022-03-17 出版日期:2022-09-25 发布日期:2022-09-27
通讯作者: 刘天霞
作者简介:秦建（1996—），男，硕士研究生，研究方向为石墨烯复合材料摩擦学。E-mail：qinjianrz@163.com。
基金资助:
北方民族大学中央高校基本科研业务费专项(FWNX29);宁夏自然科学基金(2021AAC03181)

Preparation and tribological properties of oleic acid modified graphene/molybdenum disulfide composite lubricating additives

QIN Jian¹(), LIU Tianxia¹^,²^,³(), WANG Jian¹, LU Xing¹

^1.School of Chemistry and Chemical Engineering, North Minzu University, Yinchuan 750021, Ningxia, China
^2.Ningxia Key Laboratory of Solar Chemical Conversion Technology, North Minzu University, Yinchuan 750021, Ningxia, China
^3.Key Laboratory for Chemical Engineering and Technology, State Ethnic Affairs Commission, North Minzu University, Yinchuan 750021, Ningxia, China

Received:2021-11-18 Revised:2022-03-17 Online:2022-09-25 Published:2022-09-27
Contact: LIU Tianxia

摘要/Abstract

摘要：

为研究石墨烯基二硫化钼复合材料润滑添加剂对10^#白油（10^# White Oil，10^# WO）的摩擦磨损性能影响。采用水热反应法，以油酸为改性剂，以硫化钠为硫源，制备出油酸改性还原氧化石墨烯/二硫化钼（OA-RGO-MoS₂，ORM）及还原氧化石墨烯/二硫化钼（RGO-MoS₂，RM）复合材料，利用四球长时摩擦磨损试验机考察ORM和RM对10^# WO润滑性能的影响，借助多种现代表征手段分别对两种复合材料和磨痕进行表征分析。研究结果表明：ORM较RM具有更大的层间距、更高的石墨化程度、更好的热稳定性以及更加优异的分散稳定性。两种复合材料均在质量分数为0.2%时体现出最优异的润滑性能，其中，ORM由于经过油酸改性，产生的空间位阻效应使其润滑性能更加突出，最优条件下平均摩擦系数下降了42.2%。摩擦机理分析表明：RM与ORM均可在摩擦过程中通过吸附作用或摩擦化学反应在摩擦表面形成含有铁、氧、钼、碳和硫元素的润滑保护膜，从而起到减摩抗磨的作用。

关键词: 石墨烯, 二硫化钼, 复合材料, 润滑添加剂, 摩擦特性

Abstract:

To investigate the effect of graphene-based molybdenum disulfide composite lubricant additives on the friction and wear performance of 10^# White Oil (10^# WO), oleic acid-modified reduced graphene oxide/molybdenum disulfide (OA-RGO-MoS₂, ORM) and reduced graphene oxide/molybdenum disulfide (RGO-MoS₂, RM) composites were prepared using the hydrothermal reaction method with oleic acid as a modifier and sodium sulfide as a sulfur source. The effects of ORM and RM on the lubricity of 10^# WO were examined by using a four-ball long-time friction and wear tester. Two composites and wear marks were characterized separately with the help of modern characterization tools. The results showed that ORM had a larger layer spacing, higher graphitization, better thermal stability and better dispersion stability than RM. Both composites exhibited the most excellent lubricating properties at 0.2% mass fraction. ORM was more prominent lubrication performance than RM due to the spatial site resistance effect resulted from its modification by oleic acid. For the ORM, the average friction coefficient decreased by 42.2% under the optimal condition. Friction mechanism analysis indicated that RM and ORM can form a lubrication protective film containing iron, oxygen, molybdenum, carbon and sulfur in the friction process through adsorption or friction chemical reaction in the friction surface, which improved the lubrication state of 10^# WO. Thus, they can play the role of friction reduction and anti-wear.

Key words: graphene, molybdenum disulfide, composite materials, lubricant additives, friction characteristics

中图分类号:

TH117.3

秦建, 刘天霞, 王建, 卢星. 油酸改性石墨烯/二硫化钼复合材料润滑添加剂的制备及摩擦学特性[J]. 化工进展, 2022, 41(9): 4973-4985.

QIN Jian, LIU Tianxia, WANG Jian, LU Xing. Preparation and tribological properties of oleic acid modified graphene/molybdenum disulfide composite lubricating additives[J]. Chemical Industry and Engineering Progress, 2022, 41(9): 4973-4985.

图/表 13

图1 RM 和ORM形貌图及元素分布

图2 RM和ORM的XRD图谱

图3 RGO、RM和ORM的拉曼图谱

图4 MoS2、RGO、RM、ORM的TGA和DTG曲线

表1 MoS2、RGO、RM和ORM的TGA数据

样品	残留质量/%	MoS₂负载量/%	RGO负载量/%
MoS₂	86.0	—	—
RGO	2.6	—	—
RM	48.2	54.7	45.3
ORM	59.7	68.5	31.5

表2 RM和ORM元素分析结果

样品	XPS表面元素原子量分数/%				元素分析仪整体元素质量分数/%
样品	C/%	O/%	S/%	Mo/%	C/%	S/%	H/%	N/%
RM	38.25	15.93	28.59	17.23	32.11	20.88	0.81	1.73
ORM	36.39	27.86	16.49	19.26	23.60	16.10	1.17	2.05

图5 RM和ORM的XPS谱图

图6 0.2%和1.0%的ORM或RM混合油样静置48h后的光学照片

图7 10# WO+RM油样与10# WO+ORM油样的摩擦系数

图8 10# WO+RM油样与10# WO+ORM油样平均摩擦系数图

图9 RM与ORM的下试球磨斑形貌和下试球平均磨斑直径变化趋势

图10 摩擦实验后上试球磨痕表面SEM形貌照片

图11 RM和ORM上试球磨痕XPS图

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油酸改性石墨烯/二硫化钼复合材料润滑添加剂的制备及摩擦学特性

Preparation and tribological properties of oleic acid modified graphene/molybdenum disulfide composite lubricating additives

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