表面技术2025，Vol.54Issue(9)：121-129,9.DOI:10.16490/j.cnki.issn.1001-3660.2025.09.010
Mo-DLC/Mo薄膜在甲醇中的摩擦学性能研究
Tribological Properties of Mo-DLC/Mo Films in Methanol
摘要
Abstract
The application of methanol fuel presents significant challenges for the stable and efficient operation of key moving components in internal combustion engine injection systems.These challenges are primarily manifested in the increased friction and wear rates experienced by these components when exposed to methanol,which can lead to premature failure and decreased operational efficiency.To address these issues,there is an need for the development of materials with superior friction-reducing and wear-resistant properties.The work aims to meet this demand by designing and fabricating molybdenum-doped diamond-like carbon(Mo-DLC)films on high-speed steel surfaces,with a focus on enhancing their performance in methanol-based environments.Therefore,the Mo-DLC films were prepared with magnetron sputtering technology,a widely recognized method for depositing thin films with precise control over their composition and structure.To study the impact of the Mo transition layer,Mo-DLC films with and without Mo layer were prepared on high-speed steel substrates.The comparative study was conducted to evaluate the differences in their micro-structural,morphological,mechanical and tribological properties.The micro-structural characterization of the films was performed with laser Raman spectroscopy,providing information on the chemical bonds and disorder within the films.Scanning electron microscopy(SEM)was employed to observe the cross-sectional morphology and identify any defects.The mechanical properties,including hardness and elastic modulus,were assessed through nano-indentation.Finally,the tribological properties of the films were evaluated with a wear tester in methanol and air.The results of the study revealed that the Mo-DLC film with the Mo transition layer exhibited an internal stress of approximately 1.85 GPa,significantly lower than 2.18 GPa observed in the Mo-DLC film without the transition layer.This reduction in internal stress could be attributed to the Mo transition layer,which served to buffer the mismatch in mechanical properties between the film and the substrate.The film-substrate adhesion strength was also markedly improved,increasing from 100 mN of the film without the transition layer to 210 mN of the film with the transition layer,representing an increase of 110%.In addition to the improvement in mechanical properties,the Mo-DLC/Mo films demonstrated excellent wear resistance and environmental adaptability.The wear rates in both air and methanol were significantly lower than those of the Mo-DLC film without the transition layer,with values measured at 4.6×10-8 mm³/N·m and 5.8×10-8 mm³/(N·m),respectively.This indicated that the Mo-DLC/Mo films were not only more resistant to wear but also more consistent in their performance across different environments,making them well-suited for use in methanol-fueled engines.To sum up,by reducing internal stress and improving film-substrate adhesion,the Mo transition layer enables the Mo-DLC/Mo films to achieve outstanding friction and wear performance in methanol-based environments.The research findings provide a solid theoretical foundation and practical guidance for the preparation of low-stress DLC films,which can be invaluable for their application in the methanol internal combustion engine industry.关键词
磁控溅射/DLC薄膜/过渡层/摩擦磨损/甲醇Key words
magnetron sputtering/DLC film/transition layer/friction and wear/methanol分类
机械工程引用本文复制引用
苏永要,彭浩,徐照英,张腾飞,王锦标,余伟杰,阮海波..Mo-DLC/Mo薄膜在甲醇中的摩擦学性能研究[J].表面技术,2025,54(9):121-129,9.基金项目
重庆文理学院塔基计划(R2023CL01) （R2023CL01）
重庆市技术创新与应用发展专项(cstc2019jscx-fxydX0046) （cstc2019jscx-fxydX0046）
重庆市永川区科技局项目(2024yc-jbgs20004) Foundation of Chongqing University of Arts and Sciences(R2023CL01) （2024yc-jbgs20004）
Chongqing Technology Innovation and Application Development Project(cstc2019jscx-fxydX0046) （cstc2019jscx-fxydX0046）
Foundation of Yongchuan District Science and Technology Bureau(2024yc-jbgs20004) （2024yc-jbgs20004）
