Comparative ablation behaviors of C/SiC–ZrC and C/SiC–HfC composites prepared by ceramization of carbon aerogel preforms

Zhao, Rida; Pang, Shengyang; liang, Bing; Li, Jian; Hu, Chenglong; Tang, Sufang; Cheng, Hui-Ming

doi:10.1016/j.corsci.2023.111623

Cited by 7 publications

(1 citation statement)

References 49 publications

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“…Subsequently, the composite ceramic layer is oxidized to a SiO 2 –ZrO 2 binary eutectic system, where the molten SiO 2 can fill the porous structure of ZrO 2 . Then, the system will migrate toward the surface under capillary force and gas pressure to form an intact SiO 2 –ZrO 2 binary eutectic liquid film, covering the surface of aerogel composite. The nanoscale and dense ZrO 2 particles in the liquid SiO 2 are like the trees growing on both sides of riverbank, with their roots like nails deeply rooted in the ground and playing a role in fixing soil and weakening erosion of riverbank by water. , Hence, the ZrO 2 particles can provide excellent pinning effect and improve the ability of liquid film to resist impact of oxyacetylene flame.…”

Section: Resultsmentioning

confidence: 99%

In Situ Ceramization of Nanoscale Interface Enables Aerogel with Thermal Protection at 1950 °C

Yuan,

Yan,

Tian

et al. 2024

ACS Nano

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Conventional carbon fiber felt-reinforced aerogel composites are often used as lightweight thermal protection systems (TPSs) for aerospace craft. However, due to their poor oxidation resistance, they have gradually failed to handle increasingly harsh thermal environments. In this work, a nanoscale composite coating interface of SiC-ZrC ceramic precursor is first constructed on the fiber surface. Subsequently, using the coated fiber felt as a three-dimensional skeleton and through polymerization-induced phase separation, an aerogel composite with excellent thermal protection in extreme thermal environments is prepared. Owing to the in situ ceramization of this nanoscale interface at ultrahigh temperatures, the back temperature of the 12 mm thick aerogel is only 147 °C after exposure to an oxyacetylene flame at 1950 °C for 70 s. Meanwhile, the central region of the aerogel recedes by only 7%. Not only does this work provide a way to enhance aerogels by constructing a self-ceramizable nanoscale interface it is also expected that the developed aerogel composite can be applied in the ultrahigh-temperature thermal protection of future aerospace craft.

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