The carbon fiber/phenolic resin composites were prepared and the atomic oxygen exposure test was conducted in a ground-based AO effects simulation facility. The effect of atomic oxygen on the composites was studied by scanning electron microscopy (SEM), attenuated total reflectance-fourier transform infrared spectroscopy (ATR-FTIR) and the X-ray photoelectron spectroscopy (XPS).The results show that the atomic oxygen environment, the mass loss are happened in the phenolic resin and carbon fiber and carbon/phenolic composite, and the mass loss of carbon/phenolic composite mass loss rate is greater than the total mass loss of phenolic resin and carbon fiber. Its mechanism shows the interaction of atomic oxygen with phenolic resin and carbon fiber agree with Undercutting Model. For phenolic resin, the methylene bridges and ether bond both can be oxidized after AO exposure, which result in void distributed on the surface of phenolic resin. For carbon fiber, the sizing agent is etched first and then the fiber is oxidized into —O— C =O and —C=O after AO exposure with the result that the size of carbon fiber diminishes and the cylindrical carbon fiber is out of shape with shallow and broad groove distributed on the surface.%利用原子氧暴露地面模拟实验装置,分别对碳/酚醛复合材料、碳纤维和酚醛树脂进行了20h原子氧辐照,采用扫描电子显微镜( SEM)、傅立叶红外衰减全反射(ATR-FTIR)以及X射线光电子能谱(XPS)技术分析了原子氧对碳/酚醛复合材料的侵蚀行为.结果表明,在原子氧环境中,酚醛树脂和碳纤维及碳/酚醛复合材料均发生质量损失,且碳/酚醛复合材料的质量损失率大于酚醛树脂与碳纤维之和.究其机理可知:复合材料中的孔隙和界面增大了原子氧的剥蚀面积,碳/酚醛树脂和碳纤维与原子氧的作用符合“掏蚀”模型,树脂表面出现孔洞,酚醛树脂中亚甲基和醚键易被原子氧氧化,碳纤维表面的上浆剂在原子氧环境中首先被剥蚀,而后裸露的碳纤维本体与原子氧作用导致纤维截面不再呈圆形,且尺寸减小,表面出现浅而宽的沟槽,最终纤维被氧化生成了大量的—0—C＝0和—C =0基团.
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