摘要
针对超低温介质液氮和液氧对碳纤维增强树脂基复合材料(CFs/EP)力学性能的影响进行研究,将T700碳纤维和CFs/EP在液氮和液氧中处理120h,采用X射线光电子能谱(XPS)和SEM分析碳纤维表面元素和表面形貌的变化;并研究液氧和液氮处理后碳纤维和复合材料试样的力学性能。结果表明,在经液氮处理后的碳纤维表面,上浆剂有明显损伤产生,而经液氧处理后的碳纤维表面则没有损伤出现;两种超低温介质处理对碳纤维单丝拉伸强度、表面元素及其含量的影响几乎没有区别;经液氮和液氧超低温介质处理后,CFs/EP拉伸强度均有所下降,且两者下降率接近,分别约为15.26%和14.38%;弯曲强度均有大幅提高,且提高率接近,分别约为56.18%和57.81%。因此,液氧和液氮处理对CFs/EP力学性能的影响基本没有区别。
The influence of cryogenic mediums（liquid nitrogen and liquid oxygen,LN2 and LO2）on the mechanical properties of carbon fiber reinforced epoxy resin（CFs/EP）was studied.T700 carbon fibers（CFs）and CFs/EP were immersed in liquid nitrogen（LN2）and liquid oxygen（LO2）for 120 h.The surface elements and morphology of T700 CFs were investigated by XPS and SEM,respectively.The mechanical properties of T700 CFs and CFs/EP were also researched after immersion in LN2 and LO2.The results show that there are obvious damages on the surface of T700 CFs after immersion in LN2,but no damages are found on the surface of T700 CFs after immersion in LO2.The different influence of LN2 and LO2on the surface elements of T700 CFs and single fiber tensile strength could be negligible.After immersion in LN2 and LO2,the tensile strength of CFs/EP decrease 15.26% and14.38%,respectively,and the flexural strength of CFs/EP increase 56.18% and 57.81%,respectively.Consequently,the influence of LN2 and LO2on the mechanical properties of CFs/EP are nearly no difference.
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2017年第9期1944-1952,共9页
Acta Materiae Compositae Sinica
基金
国家自然科学基金(11302036)
省自然科学基金指导计划(201602159)
基本科研业务费专项(DUT15RC(4)40)
关键词
碳纤维
环氧树脂
复合材料
液氧
液氮
超低温力学性能
carbon fibers
epoxy resin
composite materials
liquid oxygen（LO2）
liquid nitrogen（LN2）
cryogenic mechanical properties
