摘要
为研究阳极氧化技术在提高环氧树脂与铝电极界面性能中的应用,本文对铝合金进行不同时间的电解,在铝基底表面形成阳极氧化膜。对阳极氧化膜的形貌、成分、结构和电气性能进行了表征,并分析了阳极氧化膜对环氧树脂和铝界面粘接、介电性能的影响。结果表明:阳极氧化后,可形成具有纳米多孔结构的非晶态氧化膜。随着电解时间的增加,氧化膜厚度呈线性增加,但同时其内部缺陷增加,体积电阻率和电气强度降低。阳极氧化膜表现出较高的介电常数和介质损耗因数,并且在25~125℃下保持稳定。得益于阳极氧化膜的纳米多孔结构和极性键,阳极氧化后铝基板与环氧树脂的粘接剪切强度从6.76 MPa提升至10.89 MPa,粘接拉伸强度从6.89 MPa提升至9.78 MPa;冲击强度从66.21 kJ/m^(2)提升至76.42 kJ/m^(2);弯曲强度从147.65 MPa提升至180.50 MPa。阳极氧化膜提高了铝-环氧体系的电气强度,界面极化使铝-阳极氧化膜-环氧复合结构的介电常数和介质损耗因数略高于铝-环氧结构。在高压直流电场中,空间电荷主要积聚在电极和介质的界面上,阳极氧化膜可以抑制电荷注入到介质中。因此,阳极氧化作为一种有效的界面改性方法,可提升铝电极和环氧树脂的力学性能和电气性能。
To investigate the application of anodization technology on improving the interface performance between epoxy resin and aluminum electrodes,aluminum alloys were electrolyzed for different durations to form anodized films on the substrate surface.The morphology,composition,structure,and electrical properties of the anodized films were characterized,and the effects of anodic oxide films on the adhesion and dielectric properties of the epoxy-aluminum interface were analyzed.The results show that after anodic oxidation,an amorphous anodized film with a nanoporous structure is formed.As the electrolysis time increases,the thickness of the anodized film increases linearly,while the internal defects also increase,which reduces the volume resistivity and electric strength.The film exhibits a high dielectric constant and dielectric loss factor,which remain stable at 25℃-125℃.Benefiting from the nanoporous structure and polar bonds,the adhesive shear strength between the aluminum substrate and epoxy resin increases from 6.76 MPa to 10.89 MPa,and the adhesive tensile strength increases from 6.89 MPa to 9.78 MPa after anodic oxidation.The impact toughness increases from 66.21 kJ/m^(2) to 76.42 kJ/m^(2),and the flexural strength increases from 147.65 MPa to 180.50 MPa.The anodized film improves the electric strength of the aluminum-epoxy composite,and the interface polarization makes the dielectric constant and dielectric loss factor of the aluminum-anodized film-epoxy composite structure slightly higher than those of the aluminum-epoxy structure.In HVDC electric fields,space charges mainly accumulate at the interface between the electrode and the dielectric,and the anodized film can inhibit the injection of charges into the dielectric.Therefore,as an effective interface modification method,anodic oxidation can enhance the mechanical and electrical properties of aluminum electrodes and epoxy resin.
作者
朱思佳
刘鹏
周瑞彤
庞曦
王青于
彭宗仁
ZHU Sijia;LIU Peng;ZHOU Ruitong;PANG Xi;WANG Qingyu;PENG Zongren(State Key Laboratory of Electrical Insulation and Power Equipment,Xi′an Jiaotong University,Xi′an 710049,China)
出处
《绝缘材料》
北大核心
2025年第7期55-63,共9页
Insulating Materials
基金
国家自然科学基金资助项目(U23B20132)
电工材料电气绝缘全国重点实验室自主研究课题(EIPE23130)。
关键词
铝电极
环氧树脂
阳极氧化
固-固界面
空间电荷
aluminum electrode
epoxy resin
anodic oxidation
solid-solid interface
space charge
