Journal
CERAMICS INTERNATIONAL
Volume 49, Issue 3, Pages 4919-4928Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2022.10.006
Keywords
Ceramizable phenolic resin; Composites; Pyrolysis; Thermal insulation
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A novel B-Si-Zr hybridized ceramicizable resin(BSZ-PR) was successfully fabricated by chemical reaction of boric acid, zirconium hydroxyl-containing polyhedral oligomeric silsesquioxane(Zr-POSS) and phenolic. The incorporation of boric acid and Zr-POSS improved the thermal stability of the resin effectively, and the flexural strength of carbon fiber/BSZ-PR and high silica fiber/BSZ-PR composites were increased significantly. Formation of ceramic structures such as SiO2, ZrO2 and SiC at high temperatures and extreme ablative conditions from BSZ-PR and its composites may be the key to the improved thermal, ablative properties.
A novel B-Si-Zr hybridized ceramicizable resin(BSZ-PR) was fabricated by chemical reaction of boric acid, zirconium hydroxyl-containing polyhedral oligomeric silsesquioxane(Zr-POSS) and phenolic. The incorporation of boric acid and Zr-POSS improved the thermal stability of the resin effectively, and the residual carbon rate increased to 72.63% at 800 degrees C under nitrogen atmosphere. The flexural strength of carbon fiber/BSZ-PR and high silica fiber/BSZ-PR composites were increased by 25.7% and 175.5%, and linear ablation rates were reduced by 37% and 44.75%, respectively. It was discovered that the ceramic structures such as SiO2, ZrO2 and SiC can be formed at high temperatures as well as under extreme ablative conditions from both BSZ-PR and its fiber-reinforced composites, which may be the key to the improved thermal, ablative properties.
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