碳纤维表面处理对2D碳/碳复合材料弯曲性能的影响

Effect of Surface Treatment on Flexural Property of 2D C/C Composites Conductive Oxide Thin Films

为改善纤维与基体的界面结合状态及提高碳/碳复合材料性能,采用1700℃惰性气体保护、2200℃惰性气体保护、400℃空气氧化三种表面处理方法对碳纤维进行了表面处理。结果表明,经过2200℃处理后的纤维表面比较粗糙,有很多沟槽,制备的碳/碳复合材料中纤维与基体结合紧密,弯曲强度比未经表面处理的纤维制备的碳/碳复合材料弯曲强度提高75%;经过400℃处理后的纤维表面凹坑、凸起较纤维未处理前增多,制备的碳/碳复合材料中纤维与基体结合强度适中,其弯曲强度比未经表面处理的纤维制备的碳/碳复合材料弯曲强度提高43%;而经过1700℃处理的纤维表面比较光滑,纤维与基体结合弱,弯曲强度比未经表面处理的纤维制备的碳/碳复合材料的弯曲强度低。

In order to improve interface bonding between fiber and matrix and mechanical property of carbon/carbon composites, three kinds of surface treatment were applied to carbon fibers. The results showed that the surface of fiber became rough after the treatment at 2200℃ under inert gas, which formed a strong bonding in as-prepared C/C composites. The flexural strength of C/C composites was improved by 75% than that of the C/C composites reinforced by fiber of no surface treatment. The surface of fiber had more notches after the treatment at 400℃ under atmosphere gas, which formed a moderate bonding in as-prepared C/C composites and the flexural strength was improved by 43% than that of the C/C composites reinforced by fiber of no surface treatment. The smooth surface of fiber after the treatment at 1700℃ under inert gas formed a weak bonding in as-prepared C/C composite and the flexural strength was lower than that of C/C composites reinforced by fiber of no surface treatment.