吸湿-烘干对复合材料胶接界面微观结构的影响

doi:10.19936/j.cnki.2096-8000.20221028.012

摘要/Abstract

摘要： 为了研究吸湿-烘干对复合材料胶接界面微观结构的影响,首先采用打磨、干可剥布和湿可剥布对复合材料表面进行处理,然后分别在26 ℃、65%RH和70 ℃、85%RH的环境下对其进行吸湿-烘干处理。通过光学显微镜、扫描电子显微镜、红外光谱仪和X射线光电子能谱仪等对复合材料胶接界面的物理形貌和化学组成进行了研究。物理形貌分析表明,经干可剥布处理的材料表面在26 ℃、65%RH的环境下吸湿后会残留纤维丝束,进而影响单搭接剪切强度。经打磨和湿可剥布处理的材料在26 ℃、65%RH的环境下吸湿-烘干后无明显变化。将复合材料放置在70 ℃、85%RH的环境下吸湿后存在基体开裂的现象,同时纤维丝束仍残留在经干可剥布处理的材料表面,以上现象均会使单搭接剪切强度降低,且在烘干之后无法恢复。化学组成分析表明,经湿可剥布处理的材料表面在两种环境下吸湿后氧元素含量有所下降,且烘干之后无法恢复,而经干可剥布处理的材料表面残留有纤维丝束,使氧元素含量有所变化。

关键词: 吸湿-烘干, 微观结构, 可剥布, 胶接, 复合材料

Abstract: In order to study the effect of moisture absorption-drying on the microstructure of the bonding interface of composite materials, three various approaches including grinding, dry peel ply and wet peel ply are firstly used to treat the surface of the composite material, and then moisture absorption-drying treatment at 26 ℃, 65%RH and 70 ℃, 85%RH are conducted. OM, SEM, FTIR, XPS are used to study the effect of moisture absorption-drying on the morphology and composition of the bonding interface of composite materials. The physical morphology analysis shows that the composite material treated with dry peel ply will be residual fiber tows on the surface after it absorbs moisture at 26 ℃, 65%RH, which will affect the single-lap shear strength. The composite materials treated with grinding and wet peel ply do not show significant change after moisture absorption-drying at 26 ℃, 65%RH. After the composite materials are placed at 70 ℃, 85%RH to absorb moisture, there is a phenomenon of matrix cracking, and the polyester fiber tow remains on the surface of the composite material treated with dry peel ply. The above phenomenon will reduce single-lap shear strength, and cannot be recovered after drying. The chemical composition analysis indicates that the O element percentage of the composite material surface treated with wet peel ply decreases after absorbing moisture in these two systems, and can not be recovered after drying. In addition, polyester fiber tow remains on the surface of the material treated with dry peel ply, which changes the O element content.

Key words: moisture absorption-drying, microstructure, peel ply, bonding, composites

中图分类号:

TB332

张伟瑞, 秦梦兰, 陈晨, 顾灵聪, 姚东东, 郑亚萍. 吸湿-烘干对复合材料胶接界面微观结构的影响[J]. 复合材料科学与工程, 2022, 0(10): 76-84.

ZHANG Wei-rui, QIN Meng-lan, CHEN Chen, GU Ling-cong, YAO Dong-dong, ZHENG Ya-ping. The effect of moisture absorption-drying on the microstructure of the bonding interface of composite materials[J]. COMPOSITES SCIENCE AND ENGINEERING, 2022, 0(10): 76-84.

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