硬质隔热用炭纤维整体毡的制备工艺研究

摘要

With pre-oxidized fiber integrated felt prepared by relayed needle punching process as preform and thermosetting resin as precursor,impregnation-curing-carbonization of resin-graphitization process was employed to prepare rigid carbon fiber integrated felt used for thermal insulation.Effect of every process including needle punching parameters,carbonization temperature,solution concentration and curing pressure on density was studied.Microstructure of samples was studied by using SEM.The results show that high values of needle-punching parameters lead to high values of preform density,carbonization temperature has little influence on density,but much influence on carbon content.Also solution concentration and preform density have a certain influence on density.What is more,with increasing curing pressure,the density of samples increases.%以预氧化纤维网胎为原料,经过接力层叠针刺工艺制备的预氧化纤维整体毡为预制体,在不同的炭化条件下得到炭纤维整体毡,并以热固性树脂为先驱体,采用浸渍—固化—树脂炭化—石墨化的方法制备了硬质隔热用炭纤维整体毡.研究了针刺工艺、炭化温度、浸渍液浓度和固化时所加压力等因素对材料密度的影响,并借助扫描电镜观察样品的微观结构.结果表明:采用高的针刺密度和针刺深度参数,得到的预制体密度较大；炭化温度对整体毡密度的影响不大,但其含碳量随炭化温度变化明显；浸渍液浓度及预制体密度均对硬质毡的密度有一定影响；随着固化时压力的增大,样品的密度也逐渐提高.