雷雪梅,齐慧敏,谷建臻,余家欣.宽温域环境环氧/聚氨酯复合材料摩擦学性能研究[J].表面技术,2024,53(7):64-84.
LEI Xuemei,QI Huimin,GU Jianzhen,YU Jiaxin.Tribological Performance of Epoxy/Polyurethane Composites at a Wide Temperature Range[J].Surface Technology,2024,53(7):64-84 |
| 宽温域环境环氧/聚氨酯复合材料摩擦学性能研究 |
| Tribological Performance of Epoxy/Polyurethane Composites at a Wide Temperature Range |
| 投稿时间：2023-04-27 修订日期：2023-08-11 |
| DOI：10.16490/j.cnki.issn.1001-3660.2024.07.007 |
| 中文关键词: 环氧/聚氨酯互穿网络 氧化石墨烯 高低温 摩擦学性能 转移膜 |
| 英文关键词:epoxy/polyurethane interpenetrating network graphene oxide high/low temperature tribological performance transfer film |
| 基金项目:国家自然科学基金(52105214);四川省自然科学基金(2022NSFSC1928) |
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| Author | Institution |
| LEI Xuemei | Key Laboratory of Testing Technology for Manufacturing Process, Ministry of Education, Southwest University of Science and Technology, Sichuan Mianyang 621010, China |
| QI Huimin | Key Laboratory of Testing Technology for Manufacturing Process, Ministry of Education, Southwest University of Science and Technology, Sichuan Mianyang 621010, China;State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Gansu Lanzhou 730000, China |
| GU Jianzhen | Key Laboratory of Testing Technology for Manufacturing Process, Ministry of Education, Southwest University of Science and Technology, Sichuan Mianyang 621010, China |
| YU Jiaxin | Key Laboratory of Testing Technology for Manufacturing Process, Ministry of Education, Southwest University of Science and Technology, Sichuan Mianyang 621010, China |
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| 中文摘要: |
| 目的 考察环氧/聚氨酯(EP/PU)互穿网络复合材料在宽温域环境中的摩擦学性能，以及氧化石墨烯(GO)的添加对其摩擦学性能的影响。方法 制备EP、EP/GO、EP/PU、EP/PU/GO等4种材料，其中EP和PU的质量配比为3︰1，GO的质量分数为1.0%。分别研究4种材料的热力学性能，并采用高低温摩擦试验机对比研究常温和–100、–50、50、100 ℃下GO对EP/PU互穿网络材料摩擦磨损的影响。结果 热力学性能结果表明，PU的加入降低了起始分解温度，而加入GO，热分解起始温度有所提升，EP的拉伸强度最高约为90 MPa。室温条件下，200 r/min时，样品的摩擦因数和磨损率要优于400、500 r/min，其中，EP/PU/GO在200 r/min时的摩擦因数最低，为0.03。同样地，在–50、50、100 ℃时，相对于EP、EP/GO和EP/PU，EP/PU/GO也表现出优异的润滑性和耐磨性。SEM及XPS结果表明，摩擦氧化和螯合反应促进了转移膜的生长，形成了均匀结构的转移膜，可避免摩擦副的直接接触，有利于润滑作用。结论 添加GO可以有效改善材料的力学性能，提高EP/PU的摩擦学性能。 |
| 英文摘要: |
| The work aims to investigate the tribological performance of epoxy/polyurethane (EP/PU) interpenetrating network (IPN) composites under various working conditions and study the effects of graphene oxide (GO) on the friction and wear of epoxy/polyurethane IPN composites at different temperature and sliding speed. Firstly, polyurethane prepolymer with terminal isocyanates and terminal hydroxyl groups was prepared by a two-step method. Then, polyurethane pre-polymer was thoroughly mixed with EP at a weight ratio of 3︰1 for 1 h in a three-mouth flask. Meanwhile, an appropriate amount of MOCA was added into a flask and melt, then an appropriate amount of GO (1.0wt.%) was added into the above flask and stirred evenly. Next, the mixture of MOCA and GO was added into the reaction system of EP and was mixed for 1 h. After reaction, the resulting mixture was cast onto the substrate and placed on the heating platform at 80 ℃ for 1 h and finally put in muffle furnace at 100 ℃, 160 ℃ and 180 ℃ for 60 min, 60 min and 100 min, respectively. The preparation process of EP, EP/GO, and EP/PU was similar to that of EP/PU/GO. The composite structure was confirmed by FT-IR spectra and the thermodynamic properties of the composite materials were studied through thermogravimetric analysis. Moreover, the effects of graphene oxide (GO) on the friction and wear of epoxy/polyurethane IPN composites at –100 ℃, –50 ℃, 50 ℃, and 100 ℃ were studied by a high and low temperature friction tester. The worn surfaces of the composites were observed with optical microscope and Scanning Electron Microscope (SEM), and the nanostructure of the tribological film was detected through SEM. In addition, X-ray Photoelectron Spectroscopy (XPS) was used to analyze the chemical state and formation mechanism of the tribological film. The results showed that the tribological performance of epoxy/polyurethane was significantly improved by adding GO. The thermodynamic results showed that the initial decomposition temperature decreased due to the addition of polyurethane and increased due to the addition of GO. The tensile strength of EP was the highest, about 90 MPa. At room temperature, the friction coefficient and wear rate of all the samples at 200 r/min were almost better than those at 400 r/min and 500 r/min, and the friction coefficient decreased after the introduction of GO compared with the composite coating with the same substrate material. The friction coefficient of EP/PU/GO at 200 r/min was the lowest 0.03. At –100 ℃, the friction coefficient was relatively high, especially for EP and the friction coefficient was the highest (0.7). With regard to EP/PU/GO, the friction coefficient was reduced to about 0.23. Moreover, compared with EP, EP/GO and EP/PU, EP/PU/GO displayed excellent lubrication and the coefficient of friction was less than 0.2 at –50 ℃, 50 ℃ and 100 ℃, respectively. SEM and XPS results showed that the tribo-oxidization and chelation reaction promoted the growth of the transfer film, which could avoid the direct contact of the sliding interfaces and achieve the lubrication. The addition of GO can effectively improve the mechanical properties of the material and the tribological performance of epoxy/polyurethane. |
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