Atomic-Scale Understanding on the Tribological Behavior of Amorphous Carbon Films under Different Contact Pressures and Surface Textured Shapes
The textured design of amorphous carbon (a-C) film can significantly improve the tribological performance and service life of moving mechanical components. However, its friction dependence on different texture shapes, especially under different load conditions, remains unclear. In particular, due to...
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MDPI AG
2023-09-01
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| Online Access: | https://www.mdpi.com/1996-1944/16/18/6108 |
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| author | Zan Chen Naizhou Du Xiaowei Li Xubing Wei Jiaqing Ding Shiqi Lu Shuangjiang Du Cunao Feng Kai Chen Dekun Zhang Kwang-Ryeol Lee |
| author_facet | Zan Chen Naizhou Du Xiaowei Li Xubing Wei Jiaqing Ding Shiqi Lu Shuangjiang Du Cunao Feng Kai Chen Dekun Zhang Kwang-Ryeol Lee |
| author_sort | Zan Chen |
| collection | DOAJ |
| description | The textured design of amorphous carbon (a-C) film can significantly improve the tribological performance and service life of moving mechanical components. However, its friction dependence on different texture shapes, especially under different load conditions, remains unclear. In particular, due to the lack of information regarding the friction interface, the underlying friction mechanism has still not been unveiled. Therefore, the effects of contact pressure and textured shapes on the tribological behavior of a-C films under dry friction conditions were comparatively studied in this work by reactive molecular dynamics simulation. The results show that under low contact pressure, the tribological property of a-C film is sensitive to the textured shape, and the system with a circular textured surface exhibits a lower friction coefficient than that with a rectangular textured surface, which is attributed to the small fraction of unsaturated bonds. However, the increase of contact pressure results in the serious reconstruction and passivation of the friction interface. On the one hand, this induces a growth rate of friction force that is much smaller than that of the normal load, which is followed by a significant decrease in the friction coefficient with contact pressure. On the other hand, the destruction or even disappearance of the textured structure occurs, weakening the difference in the friction coefficient caused by different textured shapes of the a-C surface. These results reveal the friction mechanism of textured a-C film and provide a new way to functionalize the a-C as a protective film for applications in hard disks, MEMS, and NEMS. |
| first_indexed | 2024-03-10T22:31:28Z |
| format | Article |
| id | doaj.art-d4cd284211894df59e9bf9228389eec1 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T22:31:28Z |
| publishDate | 2023-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-d4cd284211894df59e9bf9228389eec12023-11-19T11:42:57ZengMDPI AGMaterials1996-19442023-09-011618610810.3390/ma16186108Atomic-Scale Understanding on the Tribological Behavior of Amorphous Carbon Films under Different Contact Pressures and Surface Textured ShapesZan Chen0Naizhou Du1Xiaowei Li2Xubing Wei3Jiaqing Ding4Shiqi Lu5Shuangjiang Du6Cunao Feng7Kai Chen8Dekun Zhang9Kwang-Ryeol Lee10School of Materials Science and Physics, China University of Mining and Technology, Xuzhou 221116, ChinaSchool of Materials Science and Physics, China University of Mining and Technology, Xuzhou 221116, ChinaSchool of Materials Science and Physics, China University of Mining and Technology, Xuzhou 221116, ChinaSchool of Materials Science and Physics, China University of Mining and Technology, Xuzhou 221116, ChinaSchool of Materials Science and Physics, China University of Mining and Technology, Xuzhou 221116, ChinaSchool of Materials Science and Physics, China University of Mining and Technology, Xuzhou 221116, ChinaSchool of Materials Science and Physics, China University of Mining and Technology, Xuzhou 221116, ChinaSchool of Materials Science and Physics, China University of Mining and Technology, Xuzhou 221116, ChinaSchool of Materials Science and Physics, China University of Mining and Technology, Xuzhou 221116, ChinaSchool of Materials Science and Physics, China University of Mining and Technology, Xuzhou 221116, ChinaComputational Science Center, Korea Institute of Science and Technology, Seoul 136-791, Republic of KoreaThe textured design of amorphous carbon (a-C) film can significantly improve the tribological performance and service life of moving mechanical components. However, its friction dependence on different texture shapes, especially under different load conditions, remains unclear. In particular, due to the lack of information regarding the friction interface, the underlying friction mechanism has still not been unveiled. Therefore, the effects of contact pressure and textured shapes on the tribological behavior of a-C films under dry friction conditions were comparatively studied in this work by reactive molecular dynamics simulation. The results show that under low contact pressure, the tribological property of a-C film is sensitive to the textured shape, and the system with a circular textured surface exhibits a lower friction coefficient than that with a rectangular textured surface, which is attributed to the small fraction of unsaturated bonds. However, the increase of contact pressure results in the serious reconstruction and passivation of the friction interface. On the one hand, this induces a growth rate of friction force that is much smaller than that of the normal load, which is followed by a significant decrease in the friction coefficient with contact pressure. On the other hand, the destruction or even disappearance of the textured structure occurs, weakening the difference in the friction coefficient caused by different textured shapes of the a-C surface. These results reveal the friction mechanism of textured a-C film and provide a new way to functionalize the a-C as a protective film for applications in hard disks, MEMS, and NEMS.https://www.mdpi.com/1996-1944/16/18/6108amorphous carbonfriction propertysurface texturereactive molecular dynamics |
| spellingShingle | Zan Chen Naizhou Du Xiaowei Li Xubing Wei Jiaqing Ding Shiqi Lu Shuangjiang Du Cunao Feng Kai Chen Dekun Zhang Kwang-Ryeol Lee Atomic-Scale Understanding on the Tribological Behavior of Amorphous Carbon Films under Different Contact Pressures and Surface Textured Shapes Materials amorphous carbon friction property surface texture reactive molecular dynamics |
| title | Atomic-Scale Understanding on the Tribological Behavior of Amorphous Carbon Films under Different Contact Pressures and Surface Textured Shapes |
| title_full | Atomic-Scale Understanding on the Tribological Behavior of Amorphous Carbon Films under Different Contact Pressures and Surface Textured Shapes |
| title_fullStr | Atomic-Scale Understanding on the Tribological Behavior of Amorphous Carbon Films under Different Contact Pressures and Surface Textured Shapes |
| title_full_unstemmed | Atomic-Scale Understanding on the Tribological Behavior of Amorphous Carbon Films under Different Contact Pressures and Surface Textured Shapes |
| title_short | Atomic-Scale Understanding on the Tribological Behavior of Amorphous Carbon Films under Different Contact Pressures and Surface Textured Shapes |
| title_sort | atomic scale understanding on the tribological behavior of amorphous carbon films under different contact pressures and surface textured shapes |
| topic | amorphous carbon friction property surface texture reactive molecular dynamics |
| url | https://www.mdpi.com/1996-1944/16/18/6108 |
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