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常压下,使碳纤维通过以氨气为气体介质的600℃热反应炉,反应停留时间为30s。采用三点短梁法和界面评价装置研究处理前后复合材料的层间剪切强度(ILSS)和界面剪切强度(IFSS),经氨气处理后二者分别提高了13.2%和32.1%。接触角测试结果表明:处理后碳纤维与水和环氧树脂的浸润性得到很大改善。采用扫描电子显微镜(SEM)研究处理前后碳纤维表面和复合材料断裂面形貌的变化,发现氨气处理对碳纤维表面形貌没有影响。力学性能测试数据表明,氨气处理不影响碳纤维的强度。
Atmospheric pressure, the carbon fiber through the ammonia gas as a gaseous medium 600 ℃ hot reaction furnace, the reaction residence time of 30s. The interlaminar shear strength (ILSS) and interfacial shear strength (IFSS) of the composites before and after treatment were investigated by the three-point short beam method and the interface evaluation apparatus. After ammonia treatment, the interlaminar shear strength (ILSS) and interfacial shear strength (IFSS) increased by 13.2% and 32.1% respectively. Contact angle test results show that the wettability of treated carbon fiber with water and epoxy resin is greatly improved. Scanning electron microscopy (SEM) was used to study the morphologies of the fractured surfaces of the carbon fibers and the composites before and after treatment. It was found that the ammonia treatment had no effect on the surface morphology of the carbon fibers. Mechanical properties test data show that ammonia treatment does not affect the strength of carbon fiber.