王鹏洋,龙威,赵章行,毛文元,乔妍.SiC表面水滴型微织构的水润滑特性研究[J].表面技术,2024,53(1):96-104.
WANG Pengyang,LONG Wei,ZHAO Zhangxing,MAO Wenyuan,QIAO Yan.Water Lubrication Characteristics of Droplet Texture on SiC Surface[J].Surface Technology,2024,53(1):96-104 |
| SiC表面水滴型微织构的水润滑特性研究 |
| Water Lubrication Characteristics of Droplet Texture on SiC Surface |
| 投稿时间：2022-11-02 修订日期：2023-05-12 |
| DOI：10.16490/j.cnki.issn.1001-3660.2024.01.009 |
| 中文关键词: 碳化硅 水滴型织构 摩擦因数 摩擦化学反应 动压弹流润滑 |
| 英文关键词:silicon carbide droplet texture friction coefficient frictional chemical reaction elastohydrodynamic lubrication |
| 基金项目:云南省科技厅基础研究专项重点项目(202301AS070034);云南省“万人计划/青年拔尖人才”项目(YNWR-QNBJ-2018-162) |
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| Author | Institution |
| WANG Pengyang | School of Mechatronics Engineering,Faculty of Chemical Engineering, Kunming University of Science and Technology, Kunming 650500, China |
| LONG Wei | School of Mechatronics Engineering,Faculty of Chemical Engineering, Kunming University of Science and Technology, Kunming 650500, China |
| ZHAO Zhangxing | School of Mechatronics Engineering,Faculty of Chemical Engineering, Kunming University of Science and Technology, Kunming 650500, China |
| MAO Wenyuan | School of Mechatronics Engineering,Faculty of Chemical Engineering, Kunming University of Science and Technology, Kunming 650500, China |
| QIAO Yan | School of Mechatronics Engineering,Faculty of Chemical Engineering, Kunming University of Science and Technology, Kunming 650500, China |
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| 中文摘要: |
| 目的 提高水润滑条件下SiC陶瓷的摩擦性能。方法 通过对剪切力矩和摩擦因数的测试和计算，结合扫描电镜(SEM)和能谱仪(EDS)观察试件表面的磨痕形貌及元素含量分布，分析转速、载荷和织构排布方式对变深度水滴型织构在SiC表面摩擦因数、磨损特征和摩擦化学反应的影响规律。结果 在变深度动压弹流润滑和摩擦化学反应的协同作用下，单侧水滴型织构试件在润滑介质从小端流向大端时可以实现更好的润滑性能，并且随着转速从200 r/min升至900 r/min，稳定摩擦因数从0.004增至0.068，远低于相同工况下斜槽型织构和无织构的光滑表面试件。对于水滴型织构，当润滑介质从大端流向小端时，其呈现的摩擦因数与无织构表面光滑试件的摩擦因数相近，维持在0.014~0.114。双侧水滴型织构在重载时具有更优异的润滑减摩效果，在200~900 r/min的转速范围内，能够提供稳定且较小的摩擦因数。结论 在SiC材料表面设计具有变深度特征的水滴型织构，可以有效提高系统的润滑减摩效果，特别是当润滑介质从织构较浅处流向较深处时，可以促进SiC试件表面的摩擦化学反应，生成的氧化物薄膜会覆盖在试件表面形成保护层，使SiC陶瓷的摩擦学行为得到改善。 |
| 英文摘要: |
| Surface micro-texture technology is a new type of lubrication and friction reduction, which is widely used in cutting tools, cylinder liner-piston rings, mechanical seals and other mechanical parts. In recent years, surface micro-texture has been proved to have excellent properties of reducing friction, reducing wear and improving lubrication properties between friction pairs. In this work, the friction-reducing effect of variable-depth micro-texture with droplet shape on silicon carbide material under water lubrication condition was studied and its mechanism was revealed. SiC with a diameter of 50 mm, a thickness of 20 mm, and a surface roughness of 0.02 μm was used as specimen. The LM-20 laser marking machine was used for fabricating the droplet texture and chute texture on the surface of SiC specimen. Furthermore, SEF-680 surface roughness profile shape measuring instrument was used to measure the roughness of the textured surface after processing to ensure that the processed micro-texture was consistent with the designed texture shape and size. In order to match with the SiC specimen, a friction and wear testing machine was independently built. The processed lower specimen was fixed in the oil pool by means of pin connection, and the upper specimen was fixed on the rotating shaft by means of screw thread connection. The shear torque of the friction pair under different load, speed and distribution modes was tested on a self-designed friction testing machine, and the friction coefficient was calculated to evaluate the effect of the droplet texture on the lubrication and friction reduction of the specimen. Furthermore, Scanning Electron Microscope (SEM) and Energy Disperse Spectroscopy (EDS) were used for detecting the surface wear of different specimens and the element distribution on the surface of specimens before and after the test. Finally, the lubrication mechanism of micro-texture in the depth of droplet deformation was proved. Under the synergistic effect of variable-depth elastohydrodynamic lubrication and friction-chemical reaction, the specimen with unilateral droplet texture could achieve better lubrication performance when the lubricative medium flew from small end to large end while the speed increased from 200 r/min to 900 r/min and the stable friction coefficient increased from 0.004 to 0.068. It was much lower than that of the specimens with chute texture and smooth surface under the same working conditions. When the fluid flew from the large end to the small end, the friction coefficient of the specimen with droplet texture was similar to that of the specimen with smooth surface, which was maintained at 0.014-0.114. The bilateral droplet texture had more excellent lubrication and friction reduction effect under heavy load, and could provide stable and relatively small friction coefficient in the speed range of 200-900 r/min. The design of the droplet texture with variable depth on the surface of SiC material can effectively improve the lubrication and friction reduction effect of the system, especially when the lubrication medium flows from the shallow part of the texture to the deep part. It can promote the tribological chemical reaction on the surface of SiC specimen, and the generated oxide film will cover the surface of the specimen to form a protective layer, so that the tribological behavior of SiC ceramics can be improved. |
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