| 引用本文: | 赵洋洋,卢文壮,吴泊鋆,孙玉利,左敦稳.冲蚀角对碳纤维增强树脂复合材料(CFRP)蒙皮涂层去除及重涂附着力的影响[J].中国表面工程,2023,36(1):116~123 |
| ZHAO Yangyang,LU Wenzhuang,WU Bojun,SUN Yuli,ZUO Dunwen.Effects of Erosion Angle on CFRP Skin Coating Removal and Adhesion of Recoating[J].China Surface Engineering,2023,36(1):116~123 |
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| 摘要: |
| 为解决飞机 CFRP 蒙皮涂层高效去除问题，改善重涂涂层附着力，采用塑性磨料射流加工方法对 CFRP 蒙皮损伤涂层去除，通过分析单颗磨料的速度和冲击力，研究不同冲蚀角度下磨料对涂层的冲蚀行为，探究塑性磨料射流冲蚀角对表面形貌、去除机制、材料去除率、接触角与表面自由能及重涂涂层的附着力方面的影响。结果表明：塑性磨料对涂层的冲蚀机理为塑性变形去除，在 30°~70°冲蚀角下，磨料对涂层的冲蚀模式为滑擦、耕犁和切削。随着冲蚀角的增加，颗粒的切向分力减小，法向分力增加，法向冲蚀的冲蚀模式为剪切和挤压变形去除材料去除率递减。在所选冲蚀角范围内，当冲蚀角为 30° 时，聚氨酯涂层的材料去除率最大。随着冲蚀角的改变，表面粗糙度、润湿性和表面自由能发生变化，当冲蚀角为 70°时， 重涂后的涂层附着力较好，较初始涂层附着力提高 28%左右。研究成果可为飞机 CFRP 蒙皮涂层的高效去除及附着力的改善提供参考。 |
| 关键词: 射流加工 冲蚀角 塑性磨料 碳纤维增强树脂复合材料(CFRP) 涂层 |
| DOI：10.11933/j.issn.1007?9289.20220505001 |
| 分类号:TP69 |
| 基金项目:国家自然科学基金(U20A20293，52075254)和天津市紧固连接技术企业重点实验室(TKLF2022-01-B-04)资助项目 |
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| Effects of Erosion Angle on CFRP Skin Coating Removal and Adhesion of Recoating |
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ZHAO Yangyang, LU Wenzhuang, WU Bojun, SUN Yuli, ZUO Dunwen
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College of Mechanical & Electrical Engineering, Nanjing University of Aeronautics and Astronautics,Nanjing 210016 , China
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| Abstract: |
| Carbon-fiber reinforced polymer (CFRP) composites are used as skin materials for fourth- and fifth-generation fighter jets owing to their superior properties such as high specific stiffness and strength, and light weight. To ensure the reliable performance and extend the service life of aircraft skin, protective coatings must be coated onto their surfaces. Advanced jet-fighter skin coatings are exceptionally susceptible to delamination, blistering, and spalling because of the extreme environment of supersonic flight. These not only reduce the service life of the aircraft skin but also undermine the jet’s ability for covert attacks. When this happens, the damaged coating should be removed and replaced in a timely manner to ensure the security and reliability of the aircraft skin. To address the problem of the efficient and nondestructive removal of polyurethane organic coatings from aircraft CFRP skin surfaces while improving the adhesion of repainted coatings, thermosetting plastic particles with medium hardness and angular shapes were selected as abrasives to remove damaged coatings from the CFRP skin to ensure their service life. To illustrate the coating removal mechanism by plastic abrasives, an interaction model between the particles and coating material was established based on the Hertz contact theory to quantitatively analyze the normal and tangential contact forces of a single abrasive on the workpiece. The particle velocity model was established to study the abrasive erosion behavior of coatings under different erosion angles, and investigate the effects of the plastic abrasive jet erosion angles on the erosion surface morphology, material removal mechanism, material removal rate, surface water contact angle and surface free energy, and the adhesion of repainted coatings. The results show that the erosion mechanism of plastic abrasives on the coating is plastic deformation removal. The erosion modes of abrasives on the coating are slip rubbing, plowing, and cutting at angles of 30°–50°. At erosion angles of 50°–70°, the erosion mode of the abrasive on the coating is a mixture of cutting and squeezing. At an angle of 90°, the erosion mode is shear and squeeze deformation removal. The cutting path of a single abrasive became shorter with the increase in the erosion angle, and the material removal rate decreased. Within the selected erosion angle range, the removal rate of the coating reached a maximum at 30°. The surface roughness and free energy increased and then decreased with the increase in erosion angle, and reached a maximum and minimum at 70° and 90°, respectively. The opposite is true for the surface water contact angle (wettability), reaching a maximum and minimum at 90° and 70°, respectively. The adhesion of the repainted coating improved at an erosion angle of 70°. The adhesion improved by approximately 28% compared with that of the initial coating of 3.21 MPa. This paper provides an alternative to chemical stripping or hand sanding for the efficient and frequent removal of aircraft CFRP skin coatings, while improving the adhesion, reducing costs, and protecting the environment. |
| Key words: abrasive jet machining erosion angle plastic abrasives carbon-fiber reinforced polymer (CFRP) coating |
