Synthesis of fibre reinforced Al2O3−SiO2 aerogel composite with high density uniformity via a facile high-pressure impregnation approach

Yang, Gang; Jiang, Yonggang; Feng, Jing; Zhang, Sizhao

doi:10.2298/pac1703185y

Cited by 14 publications

(5 citation statements)

References 22 publications

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“…Figure c shows the thermal conductivities of QRSA-H and QRSA-L as a function of the temperature. − Unlike the cases of most insulation ceramic materials, the thermal conductivity of porous QRSA has a weak dependence upon the temperature. In particular, the thermal conductivity of QRSA-L remains very low at 1000 °C and the QRSA-L can maintain an excellent thermal insulation at higher temperature.…”

Section: Results and Discussionmentioning

confidence: 99%

High-Energy Laser Protection Performance of Fibrous Felt-Reinforced Aerogels with Hierarchical Porous Architectures

Ma,

Liu,

et al. 2024

ACS Appl. Mater. Interfaces

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Continuous-wave lasers can cause irreversible damage to structured materials in a very short time. Modern high-energy laser protection materials are mainly constructed from ceramic, polymer, and metal constitutions. However, these materials are protected by sacrificing their structural integrity under the irradiation of high-energy lasers. In this contribution, we reported multilayer fibrous felt-reinforced aerogels that can sustain the continuous irradiation of a laser at a power density of 120 MW•m −2 without structural damage. It is found that the exceptional high-energy laser protection performance and the comparable mechanical properties of aerogel nanocomposites are attributed to the unique characteristics of hierarchical porous architectures. In comparison with various preparation methods and other aerogel materials, multilayer fibrous felt-reinforced aerogels exhibit the best performance in highenergy laser protection, arising from the gradual interception and the Raman−Rayleigh scattering cycles of a high-energy laser in the porous aerogels. Furthermore, a near-zero thermal expansion coefficient and extremely low thermal conductivity at high temperature allow the lightweight felt-reinforced aerogels to be applied in extreme conditions. The felt-reinforced aerogels reported herein offer an attractive material that can withstand complex thermomechanical stress and retain excellent insulation properties at extremely high temperature.

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Section: Results and Discussionmentioning

confidence: 99%

High-Energy Laser Protection Performance of Fibrous Felt-Reinforced Aerogels with Hierarchical Porous Architectures

Ma,

Liu,

et al. 2024

ACS Appl. Mater. Interfaces

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“…Several studies confirmed that the thermal conductivity of aerogels rises after doping with other elements. 34,35 In addition, Guo, Donghui, et al 36 and Shan, Hui, et al 37 reported that C doping could induce and prompt the porous structure formation during the doping process of aerogel materials, besides the effects of chemical composition. The density and volume percentage of the pore on the thermal conductivity are investigated in Table 2.…”

Section: Effect Of Carbonmentioning

confidence: 99%

Radiation Synthesis of Carbon/Aluminum/Silica Aerogel Nanoporous Structure Derived from Polyacrylamide Hydrogel for High Temperature and Oil Removal Applications

et al. 2023

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Aerogel is a high-performance thermal resistance material desired for high-temperature applications like dye-sensitized solar cells, batteries, and fuel cells. To increase the energy efficiency of batteries, an aerogel is required to reduce the energy loss arising from the exothermal reaction. This paper synthesized a different composition of inorganic− organic hybrid material by growing the silica aerogel inside a polyacrylamide (PAAm) hydrogel. The hybrid PaaS/silica aerogel was synthesized using different irradiation doses of gamma rays (10−60 kGy) and different solid contents of PAAm (6.25, 9.37, 12.5, and 30 wt %). Here, PAAm is used as an aerogel formation template and carbon precursor after the carbonization process at a temperature of (150, 350, and 1100 °C). The hybrid PAAm/silica aerogel was converted into aluminum/silicate aerogels after soaking in a solution of AlCl 3 . Then, the carbonization process takes place at a temperature of (150, 350, and 1100 °C) for 2 h to provide C/Al/Si aerogels with a density of around 0.18−0.040 gm/cm 3 and porosity of 84−95%. The hybrid C/Al/Si aerogels presented interconnected networks of porous structures with different pore sizes depending on the carbon and PAAm contents. The sample with a solid content of 30% PAAm in the C/Al/Si aerogel was composed of interconnected fibrils whose diameter was about 50 μm. The structure after carbonization at 350 and 1100 °C was a condensed opening porous 3D network structure. This sample gives the optimum thermal resistance and a very low thermal conductivity of 0.073 (w/m•k) at low carbon content (2.71% at temperature 1100 °C) and high v pore (95%) compared with carbon content 42.38% and v pore (93%) which give 0.102 (w/m•k). This is because at 1100 °C, the carbon atoms evolve to leave an area between Al/Si aerogel particles, increasing the pore size. Furthermore, the Al/Si aerogel had excellent removal ability for various oil samples.

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“…The main preparation method of metal impregnated slide plate is based on melt infiltration method which can be achieved in a container with high pressure, atmospheric pressure, and negative pressure at high temperature. It can be divided into pressure impregnation [88][89][90], pressureless melt infiltration [91,92], and negative pressure infiltration [93,94].…”

Section: Fabrication Technology the Metal Impregnated Carbon Slide Pl...mentioning

confidence: 99%

“…Some key parameters of metal impregnated carbon slide plates in different countries[73,81,[86][87][88] …”

mentioning

confidence: 99%

Pantograph–catenary electrical contact system of high-speed railways: recent progress, challenges, and outlooks

Dong

et al. 2022

Rail. Eng. Science

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As the unique power entrance, the pantograph–catenary electrical contact system maintains the efficiency and reliability of power transmission for the high-speed train. Along with the fast development of high-speed railways all over the world, some commercialized lines are built for covering the remote places under harsh environment, especially in China; these environmental elements including wind, sand, rain, thunder, ice and snow need to be considered during the design of the pantograph–catenary system. The pantograph–catenary system includes the pantograph, the contact wire and the interface—pantograph slide. As the key component, this pantograph slide plays a critical role in reliable power transmission under dynamic condition. The fundamental material characteristics of the pantograph slide and contact wire such as electrical conductivity, impact resistance, wear resistance, etc., directly determine the sliding electrical contact performance of the pantograph–catenary system; meanwhile, different detection methods of the pantograph–catenary system are crucial for the reliability of service and maintenance. In addition, the challenges brought from extreme operational conditions are discussed, taking the Sichuan–Tibet Railway currently under construction as a special example with the high-altitude climate. The outlook for developing the ultra-high-speed train equipped with the novel pantograph–catenary system which can address the harsher operational environment is also involved. This paper has provided a comprehensive review of the high-speed railway pantograph–catenary systems, including its progress, challenges, outlooks in the history and future.

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Synthesis of fibre reinforced Al2O3−SiO2 aerogel composite with high density uniformity via a facile high-pressure impregnation approach

Cited by 14 publications

References 22 publications

High-Energy Laser Protection Performance of Fibrous Felt-Reinforced Aerogels with Hierarchical Porous Architectures

High-Energy Laser Protection Performance of Fibrous Felt-Reinforced Aerogels with Hierarchical Porous Architectures

Radiation Synthesis of Carbon/Aluminum/Silica Aerogel Nanoporous Structure Derived from Polyacrylamide Hydrogel for High Temperature and Oil Removal Applications

Pantograph–catenary electrical contact system of high-speed railways: recent progress, challenges, and outlooks

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