摘要
抗烧蚀透波防热涂层在新一代飞行器天线窗热防护方面具有重要作用,然而现有透波防热涂层防热性能不足、缺乏对气动热环境适应性以及无法室温固化等限制了它们的应用。为解决这一问题,本文研发了一种室温固化轻质抗烧蚀透波防热涂层材料。以有机硅树脂为基体、以六方氮化硼(h-BN)为成瓷填料,通过改变h-BN的比例,制备了新型涂层材料。利用X射线衍射(XRD)、扫描电子显微镜(SEM)、热重分析(TG)、万能试验机、电弧风洞等探究了h-BN的加入对涂层材料相组成、热稳定性、力学性能及抗烧蚀透波性能的影响。结果表明,12份h-BN的添加大大提高了涂层的高温结构稳定性,显著提升了涂层的综合性能。获得的涂层密度约为0.63 g/cm^(3)、断裂伸长率为20%~30%、介电损耗角正切低于0.025,具有轻质、强韧、低介电等优点,能够实现兆瓦级高热流、面温1200℃以上热环境的抗烧蚀、防热、透波使用需求。
Ablative wave-transparent coatings play an important role in the thermal protection of the new generation of aircraft antenna windows.However,the application of the existing wave-transparent coatings was limited by their lack of thermal protection performance,adaptability to aerothermal environment and inability to vulacnize at room temperature.To address this issue,a lightweight wave-transparent and ablative thermal protection coating vulacnized at room temperature was developed in this paper.Using silicone resin as matrix and hexagonal boron nitride(h-BN)as porcelain filler,a new coating material was prepared by changing the proportion of h-BN.The effects of h-BN on the phase composition,thermal stability,mechanical properties and wave-transparent properties of the coatings were investigated by X-ray diffraction(XRD),scanning electron microscope(SEM),thermogravimetric analysis(TG),universal testing machine and arc wind tunnel,respectively.The results show that the addition of 12 phr h-BN greatly improves the structural stability of the coating at high temperature and significantly improves the comprehensive properties of the coating.The density of the obtained coating is about 0.63 g/cm^(3),the elongation at break is 20%to 30%,and dielectric loss tangent is less than 0.025.It has the advantages of light weight,strong toughness and low dielectric,and can achieve the requirements of ablation,thermal protection and wave-transparent in the thermal environment with megawatt high heat flux and surface temperature above 1200℃.
作者
闫雪
郑文海
高超
张东华
贺晨
李博乾
刘健柠
YAN Xue;ZHENG Wenhai;GAO Chao;ZHANG Donghua;HE Chen;LI Boqian;LIU Jianning(Aerospace Research Institute of Materials&Processing Technology,Beijing 100076;Beijing Institute of Mechanical and Electrical Engineering,Beijing 100074)
出处
《宇航材料工艺》
2025年第S1期48-53,共6页
Aerospace Materials & Technology
关键词
硅树脂
氮化硼
抗烧蚀透波
防热
涂层
Silicone resin
Hexagonal boron nitride
Ablation and wave-transparent
Thermal protection
Coating
作者简介
第一作者:闫雪,1994年出生,硕士,工程师,主要从事特种功能涂层材料及工艺研究工作。E-mail:yanxuebuaa@126.com。
