研究了二种烧蚀防热材料的显微结构.研究表明:烧蚀材料1＃中的高硅氧玻璃纤维在模拟烧蚀后仍保持其纤维形态不变,并且大、中、小纤维以适当的配比结合,使得纤维堆积密度增大,从而能提高材料的机械强度;烧蚀材料2＃具有蜂窝夹心结构,在蜂窝中填充的低密度材料是由50～100μm的空心玻璃球所组成的,这赋予它密度低、隔热性能好的特点.
The microstructures of two ablative materials were studied. The results show that the silica fiber
glass in No.1 ablative material remains unchanged after the simulative ablation, and proper combination of the fiber glass with different
diameters leads to increase in packing density, which not only makes the ablative material possess high mechanic strength, but also improves
its thermal insulation at high temperature. No.2 ablative material has the honeycomb structure. The honeycomb is filled with hollow glass
pellets of 50～100μm in diameter. Due to this special structure, No.2 ablative material is characterized by low density and high thermal
insulation.
参考文献
| [1] | 戚发轫等. 载人航天器技术. 北京: 国防工业出版社, 1999. 189--299. [2] 吴国庭, 陈月根. 防热结构设计. 北京: 宇航出版社, 1991. 1--82. [3] 温树林. 现代功能材料导论. 北京: 科学出版社, 1983. 256--269. [4] 奚同庚. 无机材料热物性学. 上海: 上海科学技术出版社, 1981. 285--302. [5] Canfield A, Clinton R G, et al. Improved ablative materials for the ASRM Nozzle, AIAA-92-3059, 1992. |
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