Ablation Capability of Flake Graphite Reinforced Barium-phenolic Resin Composite under Long Pulse Laser Irradiation
Ablation Capability of Flake Graphite Reinforced Barium-phenolic Resin Composite under Long Pulse Laser Irradiation
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DOI：
10.3724/sp.j.1077.2012.00157
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
Yu Qing-chun;Wan Hong
中科院分区：
文献类型：
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作者：
Yu Qing-chun;Wan Hong
碳纤维增强酚醛树脂复合材料因其优异的热烧蚀性能而被广泛用作热防护材料。采用辊涂技术制备了片状石墨增强钡酚醛树脂复合材料，并对其在长脉冲激光照射下的热烧蚀性能进行了研究。结果表明：在1700 W/ cm2辐照功率密度下，片状石墨增强钡树脂复合材料的热烧蚀率为32.8 μg/J，明显低于碳纤维增强钡树脂复合材料或钡酚醛树脂复合材料；通过对片状石墨增强钡酚醛树脂复合材料微观结构的观察和激光能量耦合计算，研究了片状石墨增强钡酚醛树脂复合材料的抗烧蚀机理。结果表明，片状石墨在复合材料中呈三明治状均匀排列。当激光辐射照射到复合材料上时，片状石墨起镜面作用，反射部分激光，从而减少了沉积在复合材料上的激光辐射能量。片状石墨的尺寸对烧蚀性能也有影响。片状石墨直径约为0.5 mm的复合材料的热烧蚀率最低。
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/cm 2 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 barium- phenolic resin composite is investigated by the observation of its microstructure and the calculation of the laser en- ergy 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 re- flects 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.