An ultralight silica-modified ZrO2–SiO2 aerogel composite with ultra-low thermal conductivity and enhanced mechanical strength

Hou, Xianbo; Zhang, Rubing; Fang, Daining

doi:10.1016/j.scriptamat.2017.09.028

Cited by 71 publications

(28 citation statements)

References 32 publications

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“…Silica aerogel is produced using nanoparticles as aggregate and form a three-dimensional structure by interconnecting each nanoparticle between them. However, the silica aerogels can resist only at a temperature below 600 • C if there is a need for a long working conditions [88]. In this sense, the composite of ZrO 2 /SiO 2 aerogel have improved results under high temperature due to ultra-low thermal conductivity.…”

Section: Zirconium Diboride/silicon Carbide (Zrb 2 /Sic) Compositesmentioning

confidence: 99%

Ceramic Composite Materials Obtained by Electron-Beam Physical Vapor Deposition Used as Thermal Barriers in the Aerospace Industry

et al. 2020

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This paper is focused on the basic properties of ceramic composite materials used as thermal barrier coatings in the aerospace industry like SiC, ZrC, ZrB 2 etc., and summarizes some principal properties for thermal barrier coatings. Although the aerospace industry is mainly based on metallic materials, a more attractive approach is represented by ceramic materials that are often more resistant to corrosion, oxidation and wear having at the same time suitable thermal properties. It is known that the space environment presents extreme conditions that challenge aerospace scientists, but simultaneously, presents opportunities to produce materials that behave almost ideally in this environment. Used even today, metal-matrix composites (MMCs) have been developed since the beginning of the space era due to their high specific stiffness and low thermal expansion coefficient. These types of composites possess properties such as high-temperature resistance and high strength, and those potential benefits led to the use of MMCs for supreme space system requirements in the late 1980s. Electron beam physical vapor deposition (EB-PVD) is the technology that helps to obtain the composite materials that ultimately have optimal properties for the space environment, and ceramics that broadly meet the requirements for the space industry can be silicon carbide that has been developed as a standard material very quickly, possessing many advantages. One of the most promising ceramics for ultrahigh temperature applications could be zirconium carbide (ZrC) because of its remarkable properties and the competence to form unwilling oxide scales at high temperatures, but at the same time it is known that no material can have all the ideal properties. Another promising material in coating for components used for ultra-high temperature applications as thermal protection systems is zirconium diboride (ZrB 2 ), due to its high melting point, high thermal conductivities, and relatively low density. Some composite ceramic materials like carbon-carbon fiber reinforced SiC, SiC-SiC, ZrC-SiC, ZrB 2 -SiC, etc., possessing low thermal conductivities have been used as thermal barrier coating (TBC) materials to increase turbine inlet temperatures since the 1960s. With increasing engine efficiency, they can reduce metal surface temperatures and prolong the lifetime of the hot sections of aero-engines and land-based turbines.

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Section: Zirconium Diboride/silicon Carbide (Zrb 2 /Sic) Compositesmentioning

confidence: 99%

Ceramic Composite Materials Obtained by Electron-Beam Physical Vapor Deposition Used as Thermal Barriers in the Aerospace Industry

et al. 2020

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“…Further, a thermally stable ZrO 2 –SiO 2 aerogel with a high specific area of 172 m 2 /g and large pore volume of 0.97 cm 3 /g after heat treatment at 1000°C was successfully fabricated . Moreover, in previous studies, some effective methods have been proposed to overcome the inherent fragility of aerogels. In our previous study, a high‐strength ZrO 2 –SiO 2 aerogel matrix was prepared by modifying the aerogel with TEOS, resulting in a compressive strength approximately 3‐10 times higher than that of previously developed fiber‐reinforced aerogel composites.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, in previous studies, some effective methods have been proposed to overcome the inherent fragility of aerogels. In our previous study, a high‐strength ZrO 2 –SiO 2 aerogel matrix was prepared by modifying the aerogel with TEOS, resulting in a compressive strength approximately 3‐10 times higher than that of previously developed fiber‐reinforced aerogel composites. The pore structure of commonly reported oxide aerogels is prone to shrinkage and collapse at temperatures greater than 1100°C .…”

Section: Introductionmentioning

confidence: 99%

“…In our previous study, a high‐strength ZrO 2 –SiO 2 aerogel matrix was prepared by modifying the aerogel with TEOS, resulting in a compressive strength approximately 3‐10 times higher than that of previously developed fiber‐reinforced aerogel composites. The pore structure of commonly reported oxide aerogels is prone to shrinkage and collapse at temperatures greater than 1100°C . To the best of our knowledge, there are no reports that aim to improve the pore structure stability of pure aerogel above 1200°C.…”

Section: Introductionmentioning

confidence: 99%

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Novel high‐temperature‐resistant Y₂SiO₅ aerogel with ultralow thermal conductivity

Hou

Zhang

et al. 2019

Int J Applied Ceramic Tech

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A novel Y 2 SiO 5 ternary aerogel was prepared from tetraethoxysilane and yttrium chloride hexahydrate via the sol-gel method followed by high-temperature calcination.The effects of different calcination temperatures on the microstructure, mechanical and thermal stability of the Y 2 SiO 5 aerogels were investigated. The aerogels exhibited low densities of 0.33-0.62 g/cm 3 , low thermal conductivities of 0.029-0.05 W/ (m·K), and a relatively high strength of 0.16-56.47 MPa. Moreover, compared with the Al 2 O 3 -SiO 2 aerogel, the Y 2 SiO 5 aerogel has higher thermal stability and more excellent high-temperature insulation, which has potential applications as a thermal protection material in hypersonic vehicles. K E Y W O R D S aerogel, insulation, thermal propertiesHow to cite this article: Gu H, Hou X, Zhang R, Fang D. Novel high-temperature-resistant Y 2 SiO 5 aerogel with ultralow thermal conductivity. Int J Appl Ceram

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“…1,2 They were rst prepared in 1976 by Teichner et al through dissolution of zirconium alkoxide in organic solvent, gelation of the sol and supercritical drying of the gel. 3 Although forty-two years have passed, ZrO 2 aerogels have started to ignite research interest [4][5][6][7] because of the growing demands for an aerogel which can be used at temperatures higher than those attainable with silica aerogels, which sinter and lose the mesopores at temperatures above 1000 C. Since ZrO 2 possesses a high melting point of 2715 C, low thermal conductivity among metal oxides, and both acid and base active centers, ZrO 2 aerogels are promising potential candidates in applications of high temperature thermal insulation, 8 catalysts, 9 electrodes in solid oxide fuel cells, 10 etc. However, fabricating a monolithic ZrO 2 aerogel with high strength and high thermal stability is still a challenge until now.…”

Section: Introductionmentioning

confidence: 99%

Monolithic zirconia aerogel from polyacetylacetonatozirconium precursor and ammonia hydroxide gel initiator: formation mechanism, mechanical strength and thermal properties

et al. 2018

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An ultralight silica-modified ZrO2–SiO2 aerogel composite with ultra-low thermal conductivity and enhanced mechanical strength

Cited by 71 publications

References 32 publications

Ceramic Composite Materials Obtained by Electron-Beam Physical Vapor Deposition Used as Thermal Barriers in the Aerospace Industry

Ceramic Composite Materials Obtained by Electron-Beam Physical Vapor Deposition Used as Thermal Barriers in the Aerospace Industry

Novel high‐temperature‐resistant Y₂SiO₅ aerogel with ultralow thermal conductivity

Monolithic zirconia aerogel from polyacetylacetonatozirconium precursor and ammonia hydroxide gel initiator: formation mechanism, mechanical strength and thermal properties

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An ultralight silica-modified ZrO2–SiO2 aerogel composite with ultra-low thermal conductivity and enhanced mechanical strength

Cited by 71 publications

References 32 publications

Ceramic Composite Materials Obtained by Electron-Beam Physical Vapor Deposition Used as Thermal Barriers in the Aerospace Industry

Ceramic Composite Materials Obtained by Electron-Beam Physical Vapor Deposition Used as Thermal Barriers in the Aerospace Industry

Novel high‐temperature‐resistant Y2SiO5 aerogel with ultralow thermal conductivity

Monolithic zirconia aerogel from polyacetylacetonatozirconium precursor and ammonia hydroxide gel initiator: formation mechanism, mechanical strength and thermal properties

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Novel high‐temperature‐resistant Y₂SiO₅ aerogel with ultralow thermal conductivity