湿热环境对T800碳纤维/环氧树脂基复合材料力学性能的影响

doi:10.11868/j.issn.1001-4381.2020.000954

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摘要

对T800碳纤维/环氧树脂基复合材料进行湿热老化实验，通过质量变化、老化前后表面形貌、红外光谱、动态力学性能，层间剪切和压缩实验，研究3.5%（质量分数，下同）NaCl溶液和去离子水两种介质分别在70℃下溶液浸泡对碳纤维/环氧树脂基复合材料力学性能的影响。结果表明：T800碳纤维/环氧树脂基复合材料在去离子水和3.5% NaCl溶液中的吸湿率相对较低，分别为0.82%和0.67%；未老化试样纤维与基体之间黏结良好，在3.5% NaCl溶液老化后纤维与基体界面破坏相比去离子水中老化更严重；经去离子水中浸泡后剪切强度降低8.8%，压缩强度降低4.3%；在3.5% NaCl中浸泡后剪切强度降低10.1%，压缩强度降低4.7%。在两种溶液老化后试样的T_g降低，但相差不大。此次研究结果对T800碳纤维/环氧树脂基复合材料在腐蚀环境中的应用提供了依据。

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	周松
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关键词 ： T800碳纤维/环氧树脂基复合材料, 湿热老化, 腐蚀环境, 力学性能

Abstract：

The hygrothermal aging test of T800 carbon fiber/epoxy resin composites was carried out. Through mass change, surface morphology before and after aging, dynamic mechanical properties, infrared spectroscopy, interlayer shear and compression tests, the effects of solution immersion in deionized water and 3.5% (mass fraction, the same as below) NaCl solution at 70℃ on the mechanical properties of carbon fiber/epoxy resin composites were studied. The results show that the moisture absorption rate of T800 carbon fiber/epoxy resin matrix composite is relatively low in deionized water and 3.5%NaCl solution, which is 0.82% and 0.67%, respectively; Good adhesion between unaging sample fiber and matrix, after aging in 3.5%NaCl solution, the interface damage between fiber and matrix is more serious than that in deionized water. After immersion in deionized water, the shear strength is decreased by 8.8%, the compressive strength is decreased by 4.3%. After soaking in 3.5% NaCl, the shear strength is decrease by 10.1%, the compressive strength is decreased by 4.7%. The T_g of the samples decreased after aging in the two solutions, but the difference is not significant, at the same time, no new substances are generated or chemical reactions occur. The research results provide a basis for the application of T800 carbon fiber/epoxy resin composites in corrosive environment.

Key words： T800 carbon fiber/epoxy resin composite hygrothermal aging corrosive environment mechanical property

收稿日期: 2020-10-14 出版日期: 2021-10-14

中图分类号:

TB332

基金资助:国家自然科学基金项目(51775355)

通讯作者: 许良 E-mail: xuxusy@163.com

作者简介: 许良(1965-), 男, 教授, 硕士, 主要从事复合材料和金属材料性能研究, 联系地址: 辽宁省沈阳市道义南大街37号沈阳航空航天大学机电工程学院(110136), E-mail: xuxusy@163.com

引用本文:

周松, 贾耀雄, 许良, 边钰博, 涂宜鸣. 湿热环境对T800碳纤维/环氧树脂基复合材料力学性能的影响[J]. 材料工程, 2021, 49(10): 138-143.
Song ZHOU, Yao-xiong JIA, Liang XU, Yu-bo BIAN, Yi-ming TU. Effect of hygrothermal environment on mechanical properties of T800 carbon fiber/epoxy resin composites. Journal of Materials Engineering, 2021, 49(10): 138-143.

链接本文:

http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2020.000954 或 http://jme.biam.ac.cn/CN/Y2021/V49/I10/138

Fig.1 质量变化曲线

Fig.2 不同浸泡溶液下SEM照片
(a)未老化；(b)去离子水老化30 d；(c)3.5%NaCl溶液老化30 d

Table 1 不同溶液浸泡对T800碳纤维复合材料层间剪切性能的影响

Table 2 不同溶液浸泡对T800碳纤维复合材料压缩性能的影响

Fig.3 不同环境下的DMA曲线

Fig.4 老化前后红外光谱图

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