Results 141 to 150 of about 23,557 (186)

Fabrication and properties of mullite thermal insulation materials with in-situ synthesized mullite hollow whiskers

Ceramics International, 2020
Abstract In this study, mullite thermal insulation materials with in-situ synthesized mullite hollow whiskers were prepared by a solid-state reaction method using industrial alumina and silica as raw materials and tungsten-containing compounds as catalysts.
Xi Tang Wang, Zhoufu Wang
exaly   +2 more sources

Preparation of mullite whiskers from topaz decomposition

Materials Letters, 2004
An inexpensive, simple method to prepare the pure mullite whiskers from natural topaz has been introduced. XRD and SEM were used to analyse the structure and morphology. A possible growth mechanism for whiskers has been suggested.
Ping Peng, Chris Sorrell
exaly   +2 more sources

Mullite whiskers derived from coal fly ash

Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing, 2007
Abstract Alumina-deficient (Al2O3/SiO2 = 1.12, molar ratio), orthorhombic mullite whiskers with a diameter of 0.6–1.8 μm (aspect ratio >30) have been manufactured by firing compacts of coal fly ash and NH4Al(SO4)2·12H2O powders, with a small addition of NaH2PO4·2H2O, at 1300 °C for 10 h. The manufacturing process, the morphology, and structure of the
S Y Yoon, H C Park
exaly   +2 more sources

Effects of in situ synthesized mullite whiskers on compressive strength of mullite fiber brick

Ceramics International, 2016
Abstract The method of in situ synthesis of mullite whiskers by gas-phase deposition and reaction was applied to improve the compressive strength of the mullite fiber brick. During the preparation process, silica sol, Al(NO 3 ) 3 solution and NH 4 F solution were introduced into the fibrous brick in the form of ions or sol through vacuum ...
Haiyan Du, Jiachen Liu, Anran Guo
exaly   +2 more sources

High temperature performance of mullite whisker-reinforced ZTA

Journal of Composite Materials, 2016
In this work, an oxide-based ceramic matrix composite (CMC) consisting of a zirconia toughened alumina (ZTA) matrix and reinforced with mullite whiskers is produced with the purpose of providing more oxidation resistance and cost-effective alternative to covalent discontinuously reinforced ceramics.
Robertson, Taylor, Huang, Xiao, Kearsey, Rick   +2 more
openaire   +3 more sources

Fibrous porous mullite ceramics modified by mullite whiskers for thermal insulation and sound absorption

Journal of the European Ceramic Society, 2023
LI Kunfeng, Feiyue Yang, Shuang Zhao
exaly   +2 more sources

Progress in fabrication and characterization of mullite whiskers

Journal of Micromechanics and Molecular Physics, 2021
Mullite has an orthorhombic crystal structure, with various advantages, such as high mechanical strength, and stable chemical and physical properties. Especially, mullite whiskers have been widely acknowledged to be potential candidates as reinforcing elements in the fabrication of ceramic-matrix composites.
Zhuohao Xiao, Wenqiang Wang, Xiuying Li, Ling Zhang, Tianshu Zhang, Ming Gao, Ling Bing Kong, Kun Zhou, Yin Liu   +8 more
openaire   +1 more source

A Catalytic Process for Mullite Whiskers

Journal of the American Ceramic Society, 1994
Mixtures of alumina and silica react with SiF 4 above 600°C to form fluorotopaz. Pyrolysis of fluorotopaz gives a stoichiometric yield of interlocked whiskers of mullite and SiF 4 , which is recovered for reuse.
John R. Moyer, Neal N. Hughes
openaire   +1 more source

ChemInform Abstract: Mechanical and Microstructural Characterization of Mullite and Mullite‐SiC‐Whisker and ZrO2‐Toughened‐Mullite‐SiC‐Whisker Composites.

ChemInform, 1988
AbstractHigh purity mullite/SiC‐whisker and mullite/ZrO2/SiC‐whisker composites of high density are prepared by hot‐pressing of alkoxy‐derived matrix materials.
R. RUH, K. S. MAZDIYASNI, M. G. MENDIRATTA   +2 more
openaire   +1 more source

Mechanical and Microstructural Characterization of Mullite and Mullite‐SiC‐Whisker and ZrO ₂ ‐Toughened‐Mullite—SiC‐Whisker Composites

Journal of the American Ceramic Society, 1988
High‐purity mullite‐SiC‐whisker composites and mullite‐ZrO 2 ‐SiC‐whisker composites were fabricated in situ by hot‐pressing using a matrix prepared by the alkoxide process. Varying degrees of ZrO 2 stabilization were achieved by varying amounts of Y
ROBERT RUH, K. S. MAZDIYASNI, M. G. MENDIRATTA   +2 more
openaire   +1 more source