硅橡胶胶接层缺陷结构的三维重构及其对粘接性能的影响  

3D reconstruction of defective structure in silicone rubber bonding layer and its influence on bonding properties

作　　者：陈紫轩 于海金 冯云 唐嘉雯 钱震 曹宇 CHEN Zixuan;YU Haijing;FENG Yun;TANG Jiawen;QIAN Zhen;CAO Yu(Beijing Xinghang Mechanical-electrical Equipment Co.,Ltd.,Beijing 100074,China;Beihang University,Beijing 100191,China;HIWING Technology Academy,Beijing 100074,China;East China University of Science and Technology,Shanghai 200237,China)

机构地区：[1]北京星航机电装备有限公司,北京100074 [2]北京航空航天大学,北京100191 [3]中国航天科工飞航技术研究院,北京100074 [4]华东理工大学,上海200237

出　　处：《兵器装备工程学报》2024年第7期247-252,共6页Journal of Ordnance Equipment Engineering

基　　金：国家自然科学基金“叶企孙”联合基金(U2341291);国家自然科学基金面上项目(22078100)。

摘　　要：胶接层缺陷是影响胶接结构强度和可靠性的主要因素。以硅橡胶胶接层为例,基于X-ray CT技术重构了胶接层中缺陷的三维结构,解析了胶层缺陷种类、分布规律及含量随热处理温度(RT~400℃)的变化规律。在此基础上,结合胶接结构拉伸剪切性能和拉伸剪切疲劳性能分析,揭示了胶层缺陷对胶接结构粘接性能的影响机制。结果表明:高温下硅橡胶的热解和老化会导致胶层气孔的产生、长大和合并;在RT~300℃内,胶层缺陷率随着热处理温度的增加而增加,但进一步增加热处理温度至400℃时,由于硅橡胶的炭化收缩,缺陷率呈现下降趋势;同时,在RT~300℃内,由于硅橡胶的高温再聚合,胶接结构的拉伸剪切强度随热处理温度的增加不断增加,但硅橡胶的高温裂解和炭化会导致其韧性下降,进而导致其拉伸疲劳性能的降低。研究结果对胶接结构的可靠性评价具有重要意义。The defective structure of bonding layer will seriously affect the reliability and strength of bonding structure.In this work,taking silicone rubber bonding layer as an example,the three-dimensional structure of defects in the bonding layer was reconstructed based on X-ray CT method,and the variation of the types,distribution,and content of defects in the bonding layer with heat treatment temperature(RT~400℃)was analyzed.On this basis,combined with the analysis of tensile shear properties and tensile shear fatigue properties of the bonding structures,the influence mechanism of the defects on the bonding properties was revealed.The results show that the pyrolysis and aging of silicone rubber at high temperature result in the formation,growth,and merger of pores in the rubber layer.Therefore,the defect structure of bonding layer increases with increasing heat treatment temperature in RT~300℃.However,when the heat treatment temperature is further increased to 400℃,the defect shows a decreasing trend due to the carbonization shrinkage of silicone rubber.At the same time,the tensile shear strength of the bonded structure increases with the increase of heat treatment temperature in RT~300℃due to the high temperature repolymerization of silicone rubber.However,the pyrolysis and carbonization of silicone rubber will lead to the decrease of toughness,and then lead to the decrease of tensile fatigue property.The research results of this work are of great significance to the reliability evaluation of the bonding structure.

关 键 词：硅橡胶 胶接结构 缺陷重构 X-ray CT 粘接性能 

分 类 号：TQ433[化学工程]