Journal
POLYMER ENGINEERING AND SCIENCE
Volume 61, Issue 2, Pages 442-452Publisher
WILEY
DOI: 10.1002/pen.25587
Keywords
ablation resistance; fibers; liquid silicone rubber; thermal insulation
Categories
Funding
- Sichuan University
- State Key Laboratory of Polymer Materials Engineering [sklpme2019-2-02]
- Fund project of equipment pre-research field [61409220207]
- National Natural Science Foundation of China [51703137]
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Flexible ablative materials are crucial for thermal protection systems in hypersonic flight missions. This study utilized epoxy resin modified liquid silicone rubber as the elastomeric matrix and evaluated the ablation resistance and thermal insulation properties of different fibers. Inorganic fibers showed higher thermal stability and could form a molten silica film for enhanced thermal protection.
Flexible ablative materials play a key role in thermal protection systems to protect space vehicles during hypersonic flight missions. In this work, epoxy resin modified liquid silicone rubber was adopted as elastomeric matrix. Two inorganic fibers (carbon fibers (CF) and quartz fibers (QF)) and two organic fibers (aramid fibers (AF) and poly (p-phenylene benzobisoxazole) fibers (PBO)) were chosen as functional fillers. The ablation resistance and thermal insulation properties were evaluated using oxyacetylene torch test. Microstructure and phase composition of the char layer was fully characterized to investigate the ablation mechanism. SEM observations revealed that the fibers are well dispersed and integrated in the matrix. TGA analysis indicated that the inorganic fibers possess significantly higher thermal stability than organic fibers. In addition, a molten silica film can be formed on the material surface, which can exert a better thermal protection effect on the matrix. Furthermore, the ablation test shows that the linear ablation rate decreases first and then increases with an increase of fiber content. This work provides basic data to guide optimal selection of fibrous ablatives to enhance ablation performance.
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