Preparation and Characterization of Mullite Fiber-Reinforced Al2O3-SiO2 Aerogel Composites

Heng Chen; Xue Ye Sui; Chang Ling Zhou; Chong Hai Wang; Chang Xia Yin; Fu Tian Liu

doi:10.4028/www.scientific.net/KEM.697.360

Paper Titles

Effect of the Addition of Al Power on the Microstructure and Phase Constitution of Al₂O₃-MgO Composites Sintered at 1700°C under N₂ Atmosphere
p.341

Effect of the Addition of Al Powder on the Microstructure and Phase Constitution of Magnesia-Spinel Composites Sintered at 1800°C in N₂
p.345

Preparation and Characterization of Al-Al₂O₃ Metal Ceramics via Powder Metallurgy Methods
p.350

Microstructure and Mechanical Properties of Multiscale Zirconia Ceramics Prepared by Field Assisted Sintering Technique
p.354

Preparation and Characterization of Mullite Fiber-Reinforced Al₂O₃-SiO₂ Aerogel Composites
p.360

Preparation of Small Size Ceria Stabilized Zirconia Microspheres by External Gelation: Effect of Vibration Frequency
p.364

The Effect of Aging Temperature and pH Value of Aging Solution on the Microstructure of ZrO₂-SiO₂ Aerogels
p.368

Preparation and Characterization of Al₂O₃/ZrO₂ Composite Ceramics
p.372

Thermal Insulation Property of Nanostructured Alumina Coated Zirconia Thermal Barrier Coating
p.377

HomeKey Engineering MaterialsKey Engineering Materials Vol. 697Preparation and Characterization of Mullite...

Preparation and Characterization of Mullite Fiber-Reinforced Al₂O₃-SiO₂ Aerogel Composites

Abstract:

Mullite fiber-reinforced Al₂O₃-SiO₂ aerogel composite was prepared through hybrid sol-gel process, vacuum pressure impregnation technology and ethanol supercritical drying technology using aluminum chloride hexahydrate (AlCl₃·6H₂O), tetraethoxysilane (TEOS) and mullite fiber as raw materials. The samples were characterized by XRD, SEM, BET, Hot Disk and Universal Testing Machine. The results showed that mullite fiber-reinforced Al₂O₃-SiO₂ aerogel composite possessed excellent heat-insulation performance, high-temperature stability and mechanical property. The thermal conductivities of composite increased from 0.0186W/mK at 150°C to 0.1198W/mK at 1200°C. The surface area of Al₂O₃-SiO₂ aerogel increased from 589m²/g at ambient temperature to 667m²/g at 600°C, and correspondingly the pore diameter increased from 21.47nm to 27.82nm. The phase of Al₂O₃-SiO₂ aerogel was from boemite at ambient temperature to γ-Al₂O₃ at 600°C, and to mullite at 1200°C. The compressive strength was 1.8MPa, when the shape variables reached 10%, the tensile strength was 0.69MPa, the bending strength was 6.4MPa.

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Periodical:

Key Engineering Materials (Volume 697)

Pages:

360-363

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.697.360

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Online since:

July 2016

Authors:

Heng Chen, Xue Ye Sui, Chang Ling Zhou, Chong Hai Wang, Chang Xia Yin, Fu Tian Liu*

Keywords:

Al₂O₃-SiO₂ Aerogel, Heat-Insulation Performance, High-Temperature Stability, Mechanical Properties, Mullite Fiber-Reinforced Al₂O₃-SiO₂ Aerogel Composite

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