Heat transfer mechanism of the C/SiC ceramics pyramidal lattice composites
Heat transfer mechanism of the C/SiC ceramics pyramidal lattice composites
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DOI：
10.1016/j.compositesb.2014.03.015
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发表时间：
2014-07
影响因子：
13.1
通讯作者：
Kai Wei;Xiangmeng Cheng;R. He;Y. Pei;D. Fang
中科院分区：
文献类型：
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作者：
Kai Wei;Xiangmeng Cheng;R. He;Y. Pei;D. Fang
提出了一种以高温C/SiC陶瓷为基元的金字塔点阵复合材料的热防护系统设计方法。首先采用交织法和化学气相渗透法（CVI）制备了尺寸为230 × 130 × 20 mm的样品。揭示了C/SiC晶格的传热机理，探索了其优良热防护性能的优化设计。提出了优化的几何参数选择准则，以平衡隔热和力学性能，包括刚度和屈服失效面。发现了晶格内主要传热机制由热传导向热空穴辐射转变的临界表面发射率。同时，最高温度的位置从杆端位置转移到面板的中心。填充隔热材料并进行表面改性以改变其表面发射率是提高其热防护性能的重要途径。这种新的设计为热防护系统提供了有前途的材料候选者。
An innovative design of pyramidal lattice composites with high temperature C/SiC ceramics as constituent has been proposed for the purpose of thermal protection system design. A sample with dimensions of 230 × 130 × 20 mm was firstly fabricated by interweaving and chemical vapor infiltration (CVI) method. Heat transfer mechanism of C/SiC lattice has been discovered to explore the optimal design of its excellent thermal protective properties. Optimal geometry parameter selection criterion has been proposed to balance the heat insulation and mechanical properties including stiffness and yield failure surface. And the critical surface emissivity was found for the dominant heat transfer mechanism transition from thermal conduction to thermal cavity radiation in the lattice. Simultaneously, the maximum temperature location transferred from the location of rod end to the center of panel. Filling insulation materials and surface modification to change the surface emissivity has been proved to be a significant way to improve the thermal protective properties. This novel design provides promising material candidate for thermal protection system.