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22 results on '"Pan, Yiwu"'

20. Flexible and interlocked quartz fibre reinforced dual polyimide network for high-temperature thermal protection.

Author

Huang, He, Yan, Xiaojie, Jin, Xiangyu, Wu, Can, Pan, Yiwu, Wang, Hebing, Zhu, Chuncheng, Hong, Changqing, Han, Wenbo, and Zhang, Xinghong

Abstract

The booming aerospace industry presents significant challenges for lightweight and flexible thermal protective materials for spacecraft and related apparatus. Despite polyimide aerogels being potential candidates with outstanding thermostability, their low strength and instability at ultra-high temperatures limit their practical applications. We report a lightweight composite interlocked by a dual polyimide network and a 3D quartz fiber felt, with attractive flexibility, excellent thermostability, long-term thermal insulation under both static and dynamic conditions, as well as superior flame retardancy and hydrophobicity. The robustness of the composite was endowed by the embedment of linear polyimide, which strengthened the felt and chemically bonded with the network polyimide. The resulting composite with a density of 0.147 g cm−3 exhibited low thermal conductivity (0.036 W m−1 K−1), reversible bending and compressive behaviors (strains of 15% and 60%, respectively), high pyrolysis temperature in air (445 °C), sustainable thermal insulation at 300–400 °C, and even 30 min-insulation at 1200 °C with a space-saving thickness (8 mm). These integrated performances made the composite promising for wide-temperature thermal protection where both efficient thermal insulation and flexibility are demanded. [ABSTRACT FROM AUTHOR]

Published
2023
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22. Lightweight, Flexible, and Covalent-Bonding Phenolic Fabric Reinforced Phenolic Ablator for Thermal Insulation and Conformal Infrared Stealth

Author

Huang, He, Li, Jinliang, Wang, Wei, Jin, Xiangyu, Wang, Hebing, Wu, Can, Pan, Yiwu, Han, Wenbo, Hong, Changqing, and Zhang, Xinghong

Abstract

Fiber-reinforced phenolic resin aerogel (FRPRA) composite materials are seductive candidates for high-temperature thermal protection owing to their low density, excellent thermostability, and thermal insulation. However, the intrinsic stiffness restricts their further application for high efficiency. We report a homogeneous and chemical bonding strategy for fabricating lightweight and flexible FRPRA with good ablative thermal insulation performance. The compressible (cyclic strain of 60%) and bendable (cyclic strain of 30%) abilities as well as the structural stability during ablation all benefit from the compatibility between the phenolic resin aerogel matrix and the phenolic fiber reinforcement. Additionally, low bulk density and thermal conductivity of 0.20 g cm–3and 0.043 W m–1K–1, respectively, endow the composite with efficient thermal insulation capability. With an 8 mm-thick coupon, the temperature of 200 °C can be decreased to 70.6 °C and the temperature around 1200 °C can be camouflaged to 78 °C through combining with the Al panel. The material also enables a conformal stealth of 600 °C based on its bendability. Hence, the composite has potential in applications of both static and dynamic thermal insulation.

Published
2023
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