Mechanical and thermal ablative behavior of ceramic-modified lightweight quartz felt reinforced phenolic aerogel
Mechanical and thermal ablative behavior of ceramic-modified lightweight quartz felt reinforced phenolic aerogel
复制标题
陶瓷改性轻质石英毡增强酚醛气凝胶的机械和热烧蚀行为
DOI：
10.1016/j.coco.2022.101285
复制
发表时间：
2022-08-28
影响因子：
8
通讯作者：
Zhang, Xinghong
中科院分区：
文献类型：
--
作者：
Wang, Hebing;Yan, Xiaojie;Zhang, Xinghong
本文报道了一种用于再入或高超声速飞行器表面热防护的陶瓷改性轻质复合材料。采用混合陶瓷树脂粘结纤维毡，在毡内原位合成酚醛气凝胶。陶瓷树脂富集在纤维表面和交叉处，利用陶瓷化和烧蚀产物在高温下保护复合材料的多孔结构。XY方向抗压强度为6.48 MPa， Z方向全体积回弹抗压强度为0.64 MPa。对于高温烧蚀，复合材料的线性烧蚀速率为0.017 mm/s，失重速率为0.024 g/s，背面温度为61.6 c，有限元模拟表明，热影响区主要集中在复合材料的上部，背面温度低于200 c，制备的复合材料在高热流气动烧蚀条件下的热防护方面有广泛的应用。
This paper reports a ceramic-modified lightweight composite for surface thermal protection of re-entry or hy-personic vehicles. The mixed ceramic resin is used to bond fiber felts, and then synthesize phenolic aerogels in situ inside felts. Ceramic resins are enriched on the fiber surfaces and intersections, protecting the composite's porous structure under high temperatures using ceramization and ablative products. The XY directional compressive strength is 6.48 MPa, and the Z directional full volume rebound compressive strength is 0.64 MPa. For the high-temperature ablation, the composite has a linear ablation rate of 0.017 mm/s, a weight loss rate of 0.024 g/s, and a backside temperature of 61.6 C. Finite element modelling shows that the heat-affected zone is mainly concentrated in the upper part of the composite, and the backside temperature is below 200 C. The prepared composites have a wide application in thermal protection under high heat flow aerodynamic ablation conditions.