摘要
为改善碳纤维增强树脂基复合材料(CFRP)表面润湿性能及表面活性,提高其胶接强度,采用旋喷式空气等离子体处理设备对CFRP进行表面处理,通过拉伸试验探究等离子体表面处理距离、处理速度对CFRP胶接性能的影响,并利用接触角测量仪、原子力显微镜(AFM)、X射线光电子能谱分析仪(XPS)等测试技术,探究等离子体处理对CFRP表面润湿性、表面形貌、表面化学组分等表面特性的影响。结果表明:CFRP表面经等离子体处理后,胶接强度逐渐提高,处理距离h为10mm,处理速度v为2mm/s时,接头强度最大。接头破坏模式从界面破坏转变为混合破坏模式。随等离子体处理距离及速度的降低,复合材料表面水接触角降低,表面自由能及极性分量增加,表面润湿性及吸附性能提高。经等离子体处理后,CFRP表面产生微米级沟壑,表面积增加,但当处理距离较近时,部分表面树脂因等离子体热响应产生损伤,不利于胶接性能的进一步提升。复合材料基体与等离子体中活性粒子相互作用后,表面含氧基团增多,并产生C—O/C—O、C=O/O—C=O等较为活泼的含氧基团,有利于复合材料与胶粘剂形成牢固的化学键合。等离子体处理可以显著提高复合材料表面润湿性、表面活性及胶接性能。
To improve the surface wettability and surface activity of Carbon fiber reinforced plastics(CFRP)and enhance its bonding strength,the surface treatment of CFRP is carried out with rotary jet air plasma treatment equipment.The influence of plasma surface treatment distance and treatment speed on the bonding performance of CFRP is investigated by tensile test,and contact angle measuring instrument(CA),atomic force microscopy(AFM),X-ray photoelectron spectroscopy(XPS)and other testing techniques are used.The effects of plasma treatment on surface wettability,surface morphology and surface chemical composition of CFRP are investigated.Results show that the bonding strength of CFRP surface increases gradually after plasma treatment.The maximum bonding strength is obtained when the treatment distance h is 10 mm and the treatment speed v is 2 mm/s.The joint failure mode changes from interface failure to mixed failure mode.With the decrease of plasma treatment distance and speed,the surface water contact angle decreases,the surface free energy and polar component increase,and the surface wettability and adsorption performance improve.After plasma treatment,the surface area of CFRP is increased by micron-level gullies.However,when the treatment distance is relatively close,some surface resins are damaged due to plasma thermal response,which is not conducive to the further improvement of bonding properties.After the composite substrate interacts with the active particles in the plasma,the oxygen-containing groups on the surface increase,and C—O/C—O,C=O/O—C=O and other relatively active oxygen-containing groups are produced,which is conducive to the formation of a strong chemical bond between the composite and the adhesive.Therefore,plasma treatment can significantly improve the surface wettability,surface activity and bonding properties of composites.
作者
邹田春
刘志浩
李晔
巨乐章
ZOU Tianchun;LIU Zhihao;LI Ye;JU Yuezhang(School of Safety Science and Engineering,Civil Aviation University of China,Tianjin 300300,China;School of Aeronautical Engineering,Civil Aviation University of China,Tianjin 300300,China)
出处
《中国表面工程》
EI
CAS
CSCD
北大核心
2022年第1期125-134,共10页
China Surface Engineering
关键词
复合材料
等离子体处理
胶接性能
表面特性
composite materials
plasma treatment
bonding performance
the surface properties
