Load Carrying Performance of Gear Using Two-dimensional Nano Graphene as Transmission Oil Additive

被引：0
|
作者：
Li D.-S. [1 ,2 ]
Kong N. [1 ]
Zhang Q.-D. [1 ]
Cao X.-Q. [2 ]
Lu Z.-B. [2 ]
Wan X.-N. [3 ]
Lin B. [3 ]
机构：
[1] School of Mechanical Engineering, University of Science and Technology Beijing, Beijing
[2] State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemicals Physics, Chinese Academy of Sciences, Lanzhou
[3] Guangxi Liugong Machinery Co., Ltd., Guangxi, Liuzhou
来源：
Surface Technology | 2023年 / 52卷 / 03期
关键词：
FZG test; hybrid lubrication film; load carrying; scratch; two-dimensional nano graphene additive;
D O I：
10.16490/j.cnki.issn.1001-3660.2023.03.012
中图分类号：
学科分类号：
摘要：
Transmission oil is the lubricating medium of gear drive systems, which not only plays a crucial role in energy transfer but also is required to meet other performance requirements, such as bearing, wear resistance, and corrosion resistance. Today, with the development of modern industrial technology, gear drive systems are operating in more severe conditions including heavy loads, high speed, high temperature and harsh environments. The traditional transmission oil has not been able to match the new requirements of wear resistance and carrying capacity. Adding nano-additive is a feasible strategy to improve the performance of lubricants. Accordingly, in this work, two-dimensional graphene nanosheet was selected to enhance the performance of traditional transmission oil in the gear drive system. Graphene nanosheet of 0.02wt.% was added to transmission oil to produce a graphene transmission oil, with 1.0wt.% succinimide as the dispersant. The gear test machine (FZG, Model: 9000) was used to evaluate the wear resistance and load-bearing capacity of transmission oil and graphene transmission oil. In the test, 20MnCr5 alloy steel gears with sixteen teeth and twenty-four teeth were used as the test gear and the drive gear, respectively. The oil level in gear box exceeded two-thirds of the gear centerline in each test. The contact stress of gears was changed by hanging weights, corresponding to the stress increase from one to twelve levels. After 15 min of test for each stress level, the gear surfaces were observed by vision to evaluate the failure level. SEM was used to characterize the gear wear morphology. EDS and Raman spectroscopy were employed to identify the chemical composition of tribofilms formed on the gear surface. X-ray photoelectron spectroscopy was obtained to further investigate the element chemical states in tribofilms. Results showed that two-dimensional graphene nanosheet as additive can increase the load-carrying capacity of transmission oil from level eight to level ten. Under the lubrication of transmission oil, the wear surface of test gear presented serious furrow phenomenon, and its wear mechanism was serious adhesion and abrasive wear. Under the lubrication of graphene transmission oil, the wear surface of the test gear became smooth, and its wear mechanism was polishing wear. A discontinuous hybrid tribofilm was formed on the gear contact surface in the heavy load and high-speed operation condition under graphene transmission oil. The tribofilm is composed of low shear strength phase (graphene, sulfide), wear particles with high hardness and yield strength (iron oxide, etc.) and amorphous polyphosphate with low elastic modulus. Among them, hard oxide debris is beneficial to prevent the development of macroscopic cracks due to relatively high friction interface hardness. Sulfide and nano-graphene contribute to friction reduction, wear improvement, and bearing capacity. Thus, as a transmission oil additive, graphene can effectively improve the tribological properties and bearing capacity of gear drive system, offset the insufficient mechanical properties of gear materials, and extend the service life of transmission gear. FZG evaluation method can help to estimate the normal working life, guide maintenance, and give early warning in time in the gear transmission system effectively. © 2023 Chongqing Wujiu Periodicals Press. All rights reserved.
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页码：151 / 160
页数：9
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