片状石墨增强树脂基复合材料的耐激光烧蚀性能研究  

Ablation Capability of Flake Graphite Reinforced Barium-phenolic Resin Composite under Long Pulse Laser Irradiation

作　　者：于庆春[1] 万红[1] 

机构地区：[1]国防科学技术大学航天与材料工程学院,长沙410073

出　　处：《无机材料学报》2012年第2期157-161,共5页Journal of Inorganic Materials

摘　　要：采用刷涂的方法制备了一种新型的片状石墨增强钡酚醛树脂基复合材料,并采用重频激光辐照的方法,对其耐烧蚀性能进行了研究.研究结果表明:片状石墨增强钡酚醛树脂基复合材料在平均功率密度为1700 J/cm2的重频激光辐照下的热烧蚀率为32.8μg/J,耐激光烧蚀性能明显高于碳纤维增强的钡酚醛树脂基复合材料和钡酚醛树脂;片状石墨增强钡酚醛树脂基复合材料中的片状石墨呈近平行的层状分布方式,在激光辐照过程中能对入射激光起到平面反射作用,从而有效地降低激光辐照的能量沉积;片状石墨的片型对复合材料的耐烧蚀性能有影响,φ0.5 mm的片状石墨增强的复合材料的耐激光烧蚀性能最好.The carbon fiber reinforced phenolic resin composite is widely used as a thermal protection material because of its excellent thermal ablation.A novel flake graphite reinforced barium-phenolic resin composite was made by roller coating technology and its thermal ablation capability under long pulse laser irradiation was studied.The results show that the thermal ablation rate of the flake graphite reinforced barium-resin composite is 32.8 μg/J at 1700 W/cm2 irradiation power density,which is much lower than that of the carbon fiber reinforced barium-resin composite or barium-phenolic resin obviously.The anti-ablative mechanism of the flake graphite reinforced bariumphenolic resin composite is investigated by the observation of its microstructure and the calculation of the laser energy coupling with the material.It is found that the flake graphite is arrayed homogeneous alignment as sandwich among the composite.When the laser radiation gets on the composite,the flake graphite plays as a mirror and reflects part of the laser,and then the laser radiation energy deposition on the composite is reduced.It is also found that the size of the flake graphite also affects the ablation capability.The composite with the flake graphite diameter of about 0.5 mm has the lowest thermal ablation rate.

关 键 词：片状石墨 激光烧蚀 重频激光 热烧蚀率 烧蚀机理 

分 类 号：TQ127[化学工程—无机化工]