Preparation of nanoporous alumina superinsulator with ultra-low thermal conductivity and improved heat resistance up to 1200 °C

Li, Junning; Hu, Zhiqiang; Wang, Xiaoting; Yang, Jinlong; Sun, Chencheng

doi:10.1016/j.ceramint.2017.03.172

Cited by 12 publications

(3 citation statements)

References 18 publications

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“…13b Supplementary information). In sharp [68][69][70], carbon aerogel [71][72][73], cellulose aerogel [74,75], fiberglass [76], silica aerogel [7,77], composite aerogel [78][79][80], ceramic fiber mat [81][82][83], CA by a CVD method [2,13,18,37], CFA [24,26,39], and commercial product Fiberfrax ® [84] contrast to the superhydrophilic AZFA, AZFA-F shows a high WCA of 140° despite the capillary effects of the macropores (Fig. 5a).…”

Section: Hydrophobic Caf For Insulation In Humid and Underwater Condi...mentioning

confidence: 99%

3D Electrospinning of Al2O3/ZrO2 fibrous aerogels for multipurpose thermal insulation

Dong,

Maciejewska,

Millar

et al. 2023

Adv Compos Hybrid Mater

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Ceramic aerogels are excellent ultralight-weight thermal insulators yet impractical due to their tendency towards structural degradation at elevated temperatures, under mechanical disturbances, or in humid environments. Here, we present flexible and durable alumina/zirconia fibrous aerogels (AZFA) fabricated using 3D sol–gel electrospinning — a technique enabling in situ formation of 3D fiber assemblies with significantly reduced time consumption and low processing cost compared to most existing methods. Our AZFAs exhibit ultralow density (> 3.4 mg cm−3), low thermal conductivity (> 21.6 mW m−1 K−1), excellent fire resistance, while remaining mechanically elastic and flexible at 1300 °C, and thermally stable at 1500 °C. We investigate the underlying structure-thermal conductivity relationships, demonstrating that the macroscopic fiber arrangement dictates the solid-phase thermal conduction, and the mesopores in the fiber effectively trap air thereby decreasing the gas conduction. We show experimentally and theoretically that directional heat transport, i.e., anisotropic thermal conductivity, can be achieved through compressing the fiber network. We further solve the moisture sensitivity problem of common fibrous aerogels through fluorination coating. The resulting material possesses excellent hydrophobicity and self-cleaning properties, which can provide reliable thermal insulation under various conditions, including but not limited to high-temperature conditions in vehicles and aircraft, humid conditions in buildings, and underwater environments for oil pipelines. Graphical Abstract

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Section: Hydrophobic Caf For Insulation In Humid and Underwater Condi...mentioning

confidence: 99%

3D Electrospinning of Al2O3/ZrO2 fibrous aerogels for multipurpose thermal insulation

Dong,

Maciejewska,

Millar

et al. 2023

Adv Compos Hybrid Mater

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show abstract

“…Nanomaterials are a new type of highly effective thermal insulation materials. Numerous studies, both domestic and international, have been conducted on the thermal insulation performance of aerogel nanomaterials [8][9][10][11][12][13][14]. Since hypersonic vehicles entail strict limits on the weight and thickness of the thermal insulation materials used, not only must the latter meet the design requirements of light weight and efficient thermal insulation but its outer surface must also be able to withstand thermal erosion by hot air.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical research on high‐temperature thermal insulation performance of lightweight porous ceramic/nanomaterial composite structure

Ren

Wu³

et al. 2019

Materialwissenschaft Werkst

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The thermal protection structure of hypersonic vehicles must meet the design requirements of high efficiency and light weight, and its heating surface must also be able to withstand thermal erosion by high‐speed and high‐temperature airflow. In this paper, a light‐weight porous ceramic material and a lightweight nanoscale thermal insulation material with excellent thermal insulation performance are combined to form an integrated thermal protection structure. Experimental study and numerical simulation of the structure's high‐temperature thermal insulation performance are carried out. The experimental results show that a composite sheet made from a 20 mm‐thick lightweight porous ceramic material and a 10 mm‐thick nanomaterial exhibit a temperature drop of 85 % between its back surface and front surface in four thermal environments (1200, 1000, 800 and 600 °C) at 1800 s. This indicates excellent thermal insulation performance of the composite sheet. In addition, the operating temperature limit (<1000 °C) is obtained through high‐temperature thermal performance tests on single‐layer nanomaterial sheets and scanning electron microscopy results. This provides an important basis for determining and optimizing the thickness ratio of the two materials in composite structure.

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“…Li and Z.J. Hu et al [2]. investigated the high-temperature thermal insulation performance of Al 2 O 3 nanomaterial sheets and their thermal stability.…”

Section: Introductionmentioning

confidence: 99%

Research on Thermal Insulation Performance of Lightweight Thermal Protection Materials for High Speed Aircraft under Different Boundary Conditions

Wang

Ren

2018

MATEC Web Conf.

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Abstract. The determination of thermal insulation performance of thermal protection materials or structures is an indispensable and important step in the safety design of high speed flight vehicles. To obtain the temperature difference of the radiating surface for plate specimens under three different boundary conditions in heat insulation experiments (the specimens were placed either vertically or horizontally with the radiating surface facing down or horizontally with the radiating surface facing up), three thermal test setups were established to test the thermal insulation performance of light-weight ceramic specimens at different temperatures. The results show that the radiating surface temperature was the highest when the specimen was placed horizontally with the radiating surface facing down, while it was the lowest when the specimen was placed horizontally with the radiating surface facing up.The numerical calculation results agreed very well with the experimental ones, confirming the credibility and accuracy of the experimental results. The different thermal insulation performances of the plate specimens obtained under three different boundary conditions will provide important guidance for designers in the design of thermal protection systems for large cabins of high speed flight vehicles.

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Preparation of nanoporous alumina superinsulator with ultra-low thermal conductivity and improved heat resistance up to 1200 °C

Cited by 12 publications

References 18 publications

3D Electrospinning of Al2O3/ZrO2 fibrous aerogels for multipurpose thermal insulation

3D Electrospinning of Al2O3/ZrO2 fibrous aerogels for multipurpose thermal insulation

Experimental and numerical research on high‐temperature thermal insulation performance of lightweight porous ceramic/nanomaterial composite structure

Research on Thermal Insulation Performance of Lightweight Thermal Protection Materials for High Speed Aircraft under Different Boundary Conditions

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