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

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

Abstract

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

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

CLC Number:

TH117.3

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.

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.

Figures/Tables 13

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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

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

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

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

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