| 摘要: |
| 钛及其合金具有优良的性能被广泛应用于武器装备领域，但在磨料条件下易黏着、不耐磨的特性限制了其使用。为了提高钛在磨料作用下的减摩抗磨性能，以 TA2 钛为研究对象，使用激光加工技术在 TA2 样品表面上制备点阵微织构，然后采用磁控溅射技术在点阵微织构表面制备类金刚石碳（Diamond-like Carbon, DLC）薄膜，形成 DLC 复合微织构；采用 MS-T3000 摩擦磨损试验机研究了 DLC 复合微织构表面在磨料作用下的摩擦磨损性能，并通过扫描电子显微镜、能谱分析、 拉曼测试、有限元分析等手段研究钛表面 DLC 复合微织构的摩擦磨损机理。结果显示 DLC 复合微织构表面可有效提高钛在磨料条件下的减摩抗磨性能，且同等条件下，点阵密度对 DLC 复合微织构样品表面摩擦因数的影响最大，单位面积点阵边缘密度值与样品表面磨损率有关，且二者基本呈正线性关系。揭示了 DLC 复合微织构在磨粒磨损条件下的摩擦磨损性能， 并从织构边缘的破坏提出磨损机理，研究结果可为钛在磨料磨损条件下的应用提供理论和设计依据。 |
| 关键词: 磨料磨损 钛 微织构 类金刚石碳膜 磨损机理 |
| DOI：10.11933/j.issn.1007-9289.20221209002 |
| 分类号:TG156；TB114 |
| 基金项目:中国航空工业集团有限公司应用创新技术群（625012004）；国家自然科学基金（51875537）资助项目 |
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| Abrasive Wear Mechanism of the Diamond-like Carbon Composite Microstructure Surface |
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LI Xingliang1,2, YUE Wen2,3, KANG Jiajie2,3, MENG Dezhong2,3, WANG Chengbiao2,3
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1.Aviation Key Laboratory of Science and Technology on Precision Manufacturing,Beijing Institute of Aeronautical Precision Machinery, Beijing 100076 , China;2.School of Engineering and Technology, China University of Geosciences (Beijing), Beijing 100083 , China;3.Zhengzhou Research Institute, China University of Geosciences (Beijing), Zhengzhou 450001 , China
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| Abstract: |
| For more than one hundred years, researchers have been investigating the tribological behavior of certain materials. Their studies concentrated mostly on adding lubricants or modifying the material surface. Unfortunately, these methods do not always guarantee effectiveness in special conditions, such as under abrasive wear. The application of surface texturing on rubbing pairs has been demonstrated to improve the abrasive wear property of certain materials. Titanium and its related alloys are one such type of materials that exhibit excellent properties and are widely used in important fields such as weapon equipment, civilian products, and the chemical industry. However, applications of titanium and its related alloys are limited by its easy adhesion and poor wear resistance under abrasive wear conditions. Therefore, it is of great significance to study the friction reduction and wear resistance performance of surface-textured titanium under abrasive conditions. Many scholars have conducted extensive research on the friction and wear properties of textured surfaces. However, the quantitative relationship between the texture edge and wear resistance property has not been further investigated. The purpose of this study is to investigate the effect of the texture edge on abrasive wear performance. The substrate selected is a commercial pure titanium grade 2 (TA2), which has poor tribological behavior under abrasive wear. To prepare the diamond-like carbon (DLC) composite textured surface, an indirect laser processing method (i.e., laser processing before DLC film deposition) is chosen to prevent the DLC film from being damaged by laser exposure. Dimple textures are prepared on the surface of TA2 using laser processing technology. The dimple texture parameters are designed by using orthogonal analysis to equalize sampling so that the results do not depend on subjective factors. Afterward, DLC film is deposited on the dimple textured surface using magnetron sputtering. The DLC composite textured surfaces are obtained through the above processing methods. First, the friction and wear performances of DLC composite textured surfaces are analyzed based on simulation and experimental methods. The stress distribution of the dimple textured surface under dry friction is studied using finite element analysis. In addition, the friction and wear properties of DLC composite textured surfaces under lunar soil conditions are studied using an MS-T3000 friction and wear tester, and the effect of dimple edges on tribological performance is studied. Second, various testing methods are used to analyze the micro properties of the worn surface. Surface analysis technologies, such as scanning electron microscopy, energy dispersive spectrometry, and Raman analysis, are used to study the microstructure, chemical characteristics, and molecular structures of the DLC surfaces before and after the tribotest. Finally, important conclusions are drawn by analyzing the mechanism of friction and wear. The analysis results show that the maximum stress appears at the edge of the texture. Moreover, a mathematical model is established to obtain the formula for the edge density of the texture on a unit area. Under the same friction conditions, the average friction factor of the DLC composite micro-textured surface is lower than that of the untreated surface. The wear rates of samples with different texture parameters are listed in order. Meanwhile, the micro morphology and tribochemical properties of the worn surface are studied. The results reveal that the DLC composite textured surface can effectively play an important role in reducing friction and wear. The dimple density exhibits a noticeable influence on the friction coefficient of the surface while the dimple texture edge density greatly influences on the wear rate. The research results can provide a theoretical and design basis for the application of titanium under abrasive wear conditions. Furthermore, it also has importance for the development of certain materials. |
| Key words: abrasive wear titanium texture diamond-like carbon film wear mechanism |
