刘思思,刘强,刘金刚,姜胜强,廖君慧,余锦,何建国.表面微织构化石墨涂层对铝合金表面的协同减摩机理研究[J].表面技术,2019,48(8):29-38.
LIU Si-si,LIU Qiang,LIU Jin-gang,JIANG Sheng-qiang,LIAO Jun-hui,YU Jin,HE Jian-guo.Synergistic Antifriction Mechanism of Surface Micro-textured Graphite Coating on Aluminum Alloy Surface[J].Surface Technology,2019,48(8):29-38 |
| 表面微织构化石墨涂层对铝合金表面的协同减摩机理研究 |
| Synergistic Antifriction Mechanism of Surface Micro-textured Graphite Coating on Aluminum Alloy Surface |
| 投稿时间：2019-02-28 修订日期：2019-08-20 |
| DOI：10.16490/j.cnki.issn.1001-3660.2019.08.005 |
| 中文关键词: 铝合金 激光微织构 石墨涂层 乏油润滑 协同减摩机理 |
| 英文关键词:aluminum alloy laser micro-texture graphite coating oil shortage lubrication synergistic mechanism of antifriction |
| 基金项目:国家自然科学基金项目（51405413）；湖南省自然科学基金项目（2018JJ4055）；长株潭国家自主创新示范区专项（2018XK2302，2017XK2107） |
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| Author | Institution |
| LIU Si-si | 1.School of Mechanical Engineering, Xiangtan University, Xiangtan 411105, China; 2.Hunan Provincial Key Laboratory of Vehicle Power and Transmission System, Xiangtan 411105, China |
| LIU Qiang | 1.School of Mechanical Engineering, Xiangtan University, Xiangtan 411105, China; 2.Hunan Provincial Key Laboratory of Vehicle Power and Transmission System, Xiangtan 411105, China |
| LIU Jin-gang | 1.School of Mechanical Engineering, Xiangtan University, Xiangtan 411105, China; 2.Hunan Provincial Key Laboratory of Vehicle Power and Transmission System, Xiangtan 411105, China |
| JIANG Sheng-qiang | 1.School of Mechanical Engineering, Xiangtan University, Xiangtan 411105, China; 2.Hunan Provincial Key Laboratory of Vehicle Power and Transmission System, Xiangtan 411105, China |
| LIAO Jun-hui | 3.Hunan Jiangbin Machinery (Group) Co. Ltd, Xiangtan 411100, China |
| YU Jin | 4.China Academy of Sciences Institute of Optoelectronics, Beijing 100094, China |
| HE Jian-guo | 4.China Academy of Sciences Institute of Optoelectronics, Beijing 100094, China |
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| 中文摘要: |
| 目的 研究微织构和固体润滑涂层对铝合金表面减摩、抗磨性能的协同作用效果，为铝合金内燃机活塞外圆表面的减摩、抗磨设计提供参考。方法 采用脉冲Nd:YAG激光器在试件表面加工出具有规则形貌的正方形凹坑阵列，利用热喷涂工艺在微织构化基体表面喷覆固体石墨涂层，在乏油条件下，利用HSR-2M型高速往复摩擦磨损试验机进行摩擦磨损实验，采用扫描电子显微镜和超景深显微系统对试样磨损表面进行了分析，研究微织构几何参数、相对滑动速度、涂层特性对摩擦副表面减摩、抗磨作用的协同机理及影响规律。结果 在乏油润滑条件下，仅覆盖石墨涂层的摩擦副表面，摩擦系数较光滑表面降低了44%。经微织构修饰的摩擦副表面，其摩擦系数明显小于光滑表面，其中微织构所占面密度为8.2%时摩擦系数最低，相对于光滑表面降低了67.4%。当在微织构和石墨涂层的协同作用下，摩擦系数进一步降低至0.07，且铝合金基底表面未见明显磨损，此外较高的滑动速度有利于摩擦系数的进一步降低。结论 微织构和石墨涂层的协同作用下，能有效改善乏油工况下铝合金表面的摩擦学性能，合理的几何参数可以更有效地发挥减摩和抗磨效果。 |
| 英文摘要: |
| The synergistic effects of micro texture and solid lubricating coating on the anti-friction and anti-wear performances of aluminum alloy surface were studied, which provided references for the anti-friction and anti-wear design of the aluminum alloy piston outer surface of internal combustion engine. The square-shaped micro pits array with regular morphology on the surface of the test pieces were fabricated by pulsed Nd:YAG laser, and the textured surfaces were modified by the thermal spraying solid graphite. Moreover, the tribological performances were study by the HSR-2M type high speed reciprocating friction and wear testing machine under the condition of oil shortage, and the worn surfaces of test pieces were analyzed by scanning electron microscopy and three-dimensional microscope. Furthermore, the synergistic effect and the influence mechanism of micro-texture geometric parameters, relative sliding speeds and coating properties on anti-friction and anti-wear performances were studied. The experimental results show that, under the limited lubrication condition, the friction coefficients of substrate surfaces covered with graphite coating are reduced by 44% compared with the smooth surfaces. On the contrast, the surfaces of the friction pair modified by micro-texture also have friction coefficients significantly smaller than that of smooth surfaces, and the micro-textured surface has a minimum coefficient of friction of 0.074 when the density of micro-texture is 8.2%, which is 67.4% lower than that of the smooth surface. When the frictional coefficient is further reduced to 0.07 under the synergistic effect of the micro texture and graphite coating, no significant wear is observed on the surface of the aluminum alloy substrate. What’s more, a higher sliding speed facilitates a further reduction in the coefficient of friction. Under the synergistic effects of micro-texture and graphite coating, they can effectively improve the tribology performance of aluminum alloy friction pair under the condition of oil shortage. Moreover, reasonable geometric parameters can effectively reduce the friction and anti-wear effect. |
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