碳纤维高温气相氧化对聚醚醚酮复合材料拉伸和层间剪切性能的影响
Effect of high-temperature gas-phase oxidation of carbon fiber on tensile and interlaminar shear properties of PEEK composites
王成博 1张代军 1李军 1陈祥宝1
作者信息
- 1. 中国航发北京航空材料研究院,北京 100095;先进复合材料国防科技重点实验室,北京 100095
- 折叠
摘要
聚醚醚酮(PEEK)复合材料具有优异的抗冲击性能,在航空领域具有重要的应用价值.然而,聚醚醚酮复合材料成型温度高,成型过程中可能存在环氧上浆剂分解残留,导致界面强度降低、载荷传递变差等问题,影响其使用性能.本文系统地研究了碳纤维(CF)高温气相氧化对CF/PEEK复合材料拉伸和层间剪切性能的影响.首先采用不同氧化工艺处理碳纤维,采用XPS、反气相色谱法(IGC)、复丝拉伸等方法表征了碳纤维表面活性、表面能以及拉伸性能.结果表明:合适的氧化条件有利于改善纤维表面活性和表面能,但同时会降低纤维拉伸强度.采用熔体法制备了CF/PEEK预浸料,研究了高温气相氧化对CF/PEEK复合材料拉伸和层间剪切性能的影响.结果表明:纤维高温氧化后CF/PEEK复合材料 0°拉伸强度下降超过 20％,表明高温氧化会导致纤维严重损伤;90°拉伸强度变化不超过 10％,层间剪切强度变化小于 5％,表明碳纤维高温氧化未能实现复合材料界面性能改善.上述结果表明:在预浸料制备工艺中增加碳纤维高温氧化工序,不利于改善复合材料性能.
Abstract
Polyetheretherketone(PEEK)composites have excellent impact resistance and thus have important potential application value in aviation field.However,the molding temperature of PEEK composites is too high for carbon fiber(CF)with epoxy sizing agent,which will result in the decomposition of sizing agent and further cause the reduction of interface strength and deterioration of load transfer.It will affect the application of PEEK compo-sites.The effect of high-temperature gas-phase oxidation of CFs on the tensile and interlaminar shear properties of PEEK composites was systematically studied.CFs oxidized under different conditions were firstly prepared and characterized by XPS,inverse gas chromatography(IGC),bundle tensile testing to study the effect of oxidation on surface activity,surface energy and mechanical properties of CFs.The results show that appropriate oxidation con-ditions are beneficial to improving surface activity and surface energy of the CFs,while oxidation will decrease the tensile strength of CFs.CF/PEEK prepregs were prepared using the melt method,and the tensile properties and in-terlaminar shear properties of the composites were compared between untreated fibers and oxidized fibers.The res-ults show that after oxidation,the 0° tensile strength decreases by more than 20％,indicating that high-temperature oxidation of CFs will cause fiber damage;The difference in 90° tensile strength does not exceed 10％,and the differ-ence in interlaminar shear strength is less than 5％,indicating that the high-temperature oxidation of CFs failed to improve the interface properties of the composites.The above results show that adding the high-temperature oxida-tion process of CFs to the prepreg preparation process is not conducive to improve composite properties.
关键词
高温气相氧化/聚醚醚酮/复合材料/拉伸性能/层间剪切性能Key words
high-temperature gas-phase oxidation/PEEK/composites/tensile properties/interlaminar shear properties引用本文复制引用
出版年
2024
NETL
NSTL
万方数据