| TANG Xin,WANG Jingjing,LI Wei,HU Yue,LU Zhibin,ZHANG Guang'an.Research Progress and Prospects on Tribological Properties of DLC Based Nano-multilayer Films[J],53(8):52-62 |
| Research Progress and Prospects on Tribological Properties of DLC Based Nano-multilayer Films |
| Received:May 08, 2023 Revised:October 12, 2023 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2024.08.005 |
| KeyWord:DLC based nano-multilayer films mechanical properties tribological properties friction mechanism structure |
| Author | Institution |
| TANG Xin |
School of Materials and Chemistry, Shanghai University of Technology, Shanghai , China |
| WANG Jingjing |
School of Materials and Chemistry, Shanghai University of Technology, Shanghai , China |
| LI Wei |
School of Materials and Chemistry, Shanghai University of Technology, Shanghai , China |
| HU Yue |
School of Materials and Chemistry, Shanghai University of Technology, Shanghai , China |
| LU Zhibin |
State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou , China |
| ZHANG Guang'an |
State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou , China |
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| Abstract: |
| Friction and wear can cause surface damage of materials, especially metal materials, and shorten the service life of work pieces. DLC (diamond-like carbon) is an amorphous carbon film composed of mixed structures, usually formed by the mixture of sp2 carbon and sp3 carbon. With high hardness, low friction coefficient, good chemical inertness and biocompatibility, DLC is a kind of film with great potential, which has a wide range of applications in mechanical, electrical, biomedical engineering and other fields. Its super-hard, wear-resistant and self-lubricating properties meet the technical requirements of the modern manufacturing industry. It is widely used as solid lubricant for the surfaces of contact parts that rub against each other. Compared with single-layer DLC films with single component, DLC based nano-multilayer films with alternating layers of two or more components can improve the mechanical and tribological properties better, which is due to that different layers in the nano-multilayer films have different combinations of physical and chemical properties. Therefore, it can be designed from many aspects (such as high temperature, hardness, lubrication, and corrosion) to improve the mechanical properties, tribological properties and corrosion resistance of the films. Usually, the nano-multilayer films have good impact resistance and plastic deformation resistance ability, which can effectively inhibit the formation and propagation of cracks, and have a good cycle service life under high load conditions. In this paper, DLC based nano-multilayer films were systematically reviewed, including metal/DLC based nano-multilayer films, metal nitride/DLC based nano-multilayer films, metal sulfide/DLC based nano-multilayer films and other DLC based nanolayer films. Firstly, the design background and concept of DLC multilayer thin films were elaborated. The design idea of multilayer films was to form a gradient mixing interface between multilayers to achieve gradient changes in composition and properties. This multilayer structure could produce unique structural effects, which could effectively reduce various stresses generated during the friction process, and significantly improved the adhesion strength between film and substrate and the overall elastic modulus of the film, which had important significance for the structure evolution of DLC based nano-multilayer films and the interface action mechanism. Then, the friction mechanisms were summarized. The main friction mechanisms of DLC multilayer films were concluded as follows:1) The nanocrystalline/amorphous structure was formed, which improved the binding force between the layers and reduced the shear force and friction force; 2) The soft/hard multilayer alternating design resisted stress relaxation and crack deflection; 3) Under the action of pressure, the amorphous carbon layer was induced to form a two-dimensional layered structure to achieve incommensurate contact and effectively reduce friction and wear. Finally, the future development of DLC-based nano-multilayer films was forecasted. To improve the tribological properties of DLC composite films under extreme, varied and complex conditions, it is necessary to carry out researches from multiple perspectives:1) Establishing a multi-material system, which combines doping and multilayer gradient design; 2) Regulating the crystal growth rate and increasing the deposition rate and density of the films by multi-technology co-preparation; 3) Establishing a more scientific model to study the friction mechanism of DLC. |
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