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The invention relates to the field of thermal protection materials for aircrafts, and provides an ablation-resistant light thermal insulation silicon-based nano thermal protection material and a preparation method thereof in order to solve the problem that the thermal protection material cannot have temperature resistance, thermal insulation and high mechanical strength at the same time. A base body of the thermal protection material is a rigid thermal insulation tile, and gaps in the rigid thermal insulation tile are filled with aerogel. The aerogel is prepared from a precursor alkoxy silane, tetrafunctional siloxane and boric acid ester, the aerogel is of a bead model structure, the average pore size of the aerogel is 20-50 nm, and the specific surface area of the aerogel is 500-2000 m < 2 >/g; the wire ablation retreat rate of the thermal protection material is lower than 0.002 mm/s. The preparation method comprises the following steps: performing acid-alkali two-step catalysis on a precursor to obtain sol of a bead model; and dipping the rigid heat insulation tile with the sol, aging, replacing the solvent, and carrying out supercritical drying to obtain the rigid heat insulation tile filled with aerogel. The thermal protection material disclosed by the invention has an extremely low ablation thermal protection effect and excellent thermal protection performance.
本发明涉及飞行器热防护材料领域，针对热防护材料无法兼具耐温、隔热、高力学强度的问题，提供一种耐烧蚀轻质隔热硅基纳米热防护材料及其制备方法。热防护材料的基体为刚性隔热瓦，刚性隔热瓦内部的空隙被气凝胶填充；气凝胶为前驱体烷氧基硅烷、四官能团硅氧烷和硼酸酯制得气凝胶，呈串珠模型结构，气凝胶的平均孔径20‑50 nm，比表面积为500‑2000 m2/g；热防护材料的线烧蚀后退率低于0.002 mm/s。制备方法为前驱体经过酸‑碱两步催化得串珠模型的溶胶；用溶胶浸渍刚性隔热瓦，经老化、置换溶剂、超临界干燥得填充气凝胶的刚性隔热瓦。本发明的热防护材料具有极低的烧蚀热防护作用，热防护性能优异。
The invention relates to the field of thermal protection materials for aircrafts, and provides an ablation-resistant light thermal insulation silicon-based nano thermal protection material and a preparation method thereof in order to solve the problem that the thermal protection material cannot have temperature resistance, thermal insulation and high mechanical strength at the same time. A base body of the thermal protection material is a rigid thermal insulation tile, and gaps in the rigid thermal insulation tile are filled with aerogel. The aerogel is prepared from a precursor alkoxy silane, tetrafunctional siloxane and boric acid ester, the aerogel is of a bead model structure, the average pore size of the aerogel is 20-50 nm, and the specific surface area of the aerogel is 500-2000 m < 2 >/g; the wire ablation retreat rate of the thermal protection material is lower than 0.002 mm/s. The preparation method comprises the following steps: performing acid-alkali two-step catalysis on a precursor to obtain sol of a bead model; and dipping the rigid heat insulation tile with the sol, aging, replacing the solvent, and carrying out supercritical drying to obtain the rigid heat insulation tile filled with aerogel. The thermal protection material disclosed by the invention has an extremely low ablation thermal protection effect and excellent thermal protection performance.
本发明涉及飞行器热防护材料领域，针对热防护材料无法兼具耐温、隔热、高力学强度的问题，提供一种耐烧蚀轻质隔热硅基纳米热防护材料及其制备方法。热防护材料的基体为刚性隔热瓦，刚性隔热瓦内部的空隙被气凝胶填充；气凝胶为前驱体烷氧基硅烷、四官能团硅氧烷和硼酸酯制得气凝胶，呈串珠模型结构，气凝胶的平均孔径20‑50 nm，比表面积为500‑2000 m2/g；热防护材料的线烧蚀后退率低于0.002 mm/s。制备方法为前驱体经过酸‑碱两步催化得串珠模型的溶胶；用溶胶浸渍刚性隔热瓦，经老化、置换溶剂、超临界干燥得填充气凝胶的刚性隔热瓦。本发明的热防护材料具有极低的烧蚀热防护作用，热防护性能优异。
Ablation-resistant light thermal insulation silicon-based nano thermal protection material and preparation method thereof
一种耐烧蚀轻质隔热硅基纳米热防护材料及其制备方法
2024-08-30
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
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