徐研,王立国,张广安,陈体军,贾均红.橡胶表面粗糙度对DLC薄膜摩擦学性能的影响[J].表面技术,2023,52(2):225-232.
XU Yan,WANG Li-guo,ZHANG Guang-an,CHEN Ti-jun,JIA Jun-hong.Effect of Rubber Surface Roughness on the Tribological Properties of DLC Film[J].Surface Technology,2023,52(2):225-232 |
| 橡胶表面粗糙度对DLC薄膜摩擦学性能的影响 |
| Effect of Rubber Surface Roughness on the Tribological Properties of DLC Film |
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| DOI：10.16490/j.cnki.issn.1001-3660.2023.02.020 |
| 中文关键词: 三元乙丙橡胶 DLC薄膜 基体粗糙度 结合力 摩擦学性能 |
| 英文关键词:EPDM rubber DLC film substrate roughness adhesion tribological properties |
| 基金项目:甘肃省科技计划资助(21JR7RA089) |
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| Author | Institution |
| XU Yan | College of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China;Lanzhou Institute of Chemical Physics, Lanzhou 730000, China |
| WANG Li-guo | Lanzhou Institute of Chemical Physics, Lanzhou 730000, China |
| ZHANG Guang-an | Lanzhou Institute of Chemical Physics, Lanzhou 730000, China |
| CHEN Ti-jun | College of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China |
| JIA Jun-hong | College of Mechanical and Electrical Engineering, Shanxi University of Science & Technology, Xi’an 710021, China |
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| 中文摘要: |
| 目的 探究三元乙丙橡胶(EPDM)表面粗糙度对DLC薄膜和Cr/DLC的微观结构、附着力、摩擦学性能的影响，并阐明Cr中间层对橡胶表面DLC薄膜的作用。方法 使用砂纸打磨EPDM橡胶得到不同的表面粗糙度。采用非平衡磁控溅射技术在不同粗糙度的橡胶基体表面沉积无中间层的类金刚石碳基薄膜(DLC)及有Cr中间层的类金刚石碳基薄膜(Cr/DLC)。使用二维轮廓仪获得基体及薄膜的表面粗糙度，通过扫描电子显微镜以及拉曼光谱对薄膜的表面形貌和结构成分进行分析，并采用X切割试验和摩擦磨损试验分别评估DLC薄膜的附着力和摩擦学性能。结果 基体表面粗糙度对薄膜的微观结构没有显著影响，但却对薄膜附着力以及摩擦学性能有较大的影响。薄膜附着力随着基体粗糙度的增加呈现先增大后减小的趋势，当基体表面粗糙度为1 100 nm时，DLC薄膜具有最强的附着力和最佳的摩擦学性能。此外，Cr中间层的引入对提高薄膜附着力和承载能力起到了积极的作用。结论 适当增加基体表面粗糙度可以增强DLC薄膜的附着力，改善薄膜的摩擦学性能。Cr中间层可以提高薄膜的承载能力，从而提高薄膜的耐磨性。 |
| 英文摘要: |
| Rubber have usually been used as seals to prevent lubricant leakage and contaminants from entering the machine. However, rubber seals can easily fail under harsh conditions, resulting in fluid leakage or intrusion of contaminants into the lubricant. Depositing DLC carbon-based films on rubber surfaces can extend rubber life and enhance its wear resistance. In this paper, the effect of surface roughness of Ethylene Propylene Diene Monomer (EPDM) rubber on the microstructure, adhesion and tribological properties of DLC film and Cr/DLC film was investigated, and the effect of Cr interlayer on the DLC film on the rubber surface was clarified. The EPDM rubbers were cut into 30 mm × 25 mm rectangular blocks, and they were sanded with different types of sandpaper to obtain new rubber substrates with an average surface roughness of 3 600 nm, 2 300 nm , 1 100 nm and 900 nm, respectively. These rubber substrates were cleaned using a hot soap solution and distilled water to remove dust. Subsequently, DLC and Cr/DLC films were deposited on the rubber substrates with different roughness by unbalanced magnetron sputtering. The substrates were etched with Ar plasma to remove the oxides on the surface of the samples before depositing the films at a bias voltage of ‒300 V, the etching time of 15 min. Subsequently, the Cr interlayer with a thickness of about 200 nm was deposited on the surface of the sample with a Cr target current of 3 A and deposition time of 12 min. Finally, the DLC layer was deposited with a deposition current of 3.5 A and a deposition time of 2 h. The surface roughness of the substrates and DLC films were obtained by a two-dimensional profiler. Scanning electron microscope and Raman spectroscopy were used to characterize the surface morphology and structural composition of the film. The adhesion force, tribology and wear resistance of DLC film were evaluated by the X-cut test and the friction and wear test respectively. The surface roughness of the substrate had no significant effect on the microstructure of the film, but had a greater impact on the film adhesion and tribological properties. The film adhesion initially increased and then decreased with the increase of the substrate roughness. When the roughness of the substrate was smaller, the locking effect between the film and the substrate was weakened due to the smoother rubber substrate. When the substrate was larger, the surface of the rubber substrate was damaged, resulting in uneven distribution of stress on the rubber surface and concentrated in the raised parts, the film was easy to peel off. When the substrate surface roughness was 1 100 nm, the DLC film had the strongest adhesion and the best tribological properties. Moreover, the introduction of the Cr interlayer played a positive role in improving the film adhesion and load-bearing capacity. An appropriate increase in substrate surface roughness can enhance the adhesion of DLC film and improve the tribological properties of the film. The Cr interlayer can improve the load-bearing capacity of the film, thereby improving the wear resistance of the film. |
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