超低温介质对碳纤维增强树脂基复合材料力学性能的影响

发布时间：2018-12-17 05:30

【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。
[Abstract]:The effects of liquid nitrogen and oxygen on mechanical properties of carbon fiber reinforced resin matrix composites (CFs/EP) were studied. T700 carbon fiber and CFs/EP were treated in liquid nitrogen and liquid oxygen for 120 h. X-ray photoelectron spectroscopy (XPS) and SEM were used to analyze the changes of surface elements and surface morphology of carbon fiber. The mechanical properties of carbon fiber and composites treated with liquid oxygen and liquid nitrogen were studied. The results show that the surface of carbon fiber treated with liquid nitrogen has obvious damage, while the surface of carbon fiber treated with liquid oxygen has no damage. The effects of two kinds of ultra-low temperature media on the tensile strength, surface elements and their contents of carbon fiber monofilament are almost no different. After treatment with liquid nitrogen and liquid oxygen at ultra-low temperature, the tensile strength of CFs/EP decreased to a certain extent, and the decrease rates of both were close to 15.26% and 14.38%, respectively. The flexural strength increased significantly, and the increase rate was close to that of 56.18% and 57.81%, respectively. Therefore, the effect of liquid oxygen treatment and liquid nitrogen treatment on the mechanical properties of CFs/EP has no difference.
【作者单位】：大连理工大学运载工程与力学学部航空航天学院;
【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)
【分类号】：TB332

【相似文献】