Results 101 to 110 of about 167 (149)
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Mullite whiskers derived from kaolin
Ceramics International, 2009Abstract Short mullite whiskers prepared by firing compacts of kaolin and NH 4 Al(SO 4 ) 2 ·12H 2 O powders, with a small addition (0.8, 1.5 wt%) of NaH 2 PO 4 ·2H 2 O, in air 1300 and 1400 °C for 15 h have been characterized in terms of whisker morphology, composition and structure. Relatively uniform whisker shaped crystals grew within the silicate
B.M. Kim +4 more
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Synthesis of Mullite Whiskers and Their Application in Composites
Journal of the American Ceramic Society, 1991Mullite whiskers were synthesized by a vapor‐solid reaction. Mullite composition xerogels were fired at 900° to 1600°C with AlF 3 in an airtight container. An average whisker increased in length from 7 μm at 1100°C to 10 μm at 1600°C, whereas an average whisker decreased in aspect ratio from ...
Kiyoshi Okada, Nozomu Ōtuska
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Processing of Mullite Whiskers from Kaolin
Advanced Materials Research, 2007Mullite whiskers have been manufactured by firing compacts of kaolin, Al2(SO4)3 and (NH4)2SO4 powders, with a small addition of Na2SO4, in air at 1400o C for 15 h. From the batch composition of Al2O3/SiO2 = 0.7, molar ratio, alumina-deficient (Al2O3/SiO2 = 1.02, molar ratio), orthorhombic mullite whiskers with an aspect ratio of >30 (0.2-0.4 μm in ...
B.M. Kim +4 more
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Magnetic Submicron Mullite Coatings with Oriented SiC Whiskers
ACS Applied Materials & Interfaces, 2018Addressing the challenge of making ceramic thin films with the in-plane-oriented nanorods, we propose to decorate the nanorods with magnetic nanoparticles and orient them using the external magnetic field. As an illustration, the mullite thin films with embedded and oriented SiC nanorods were synthesized.
Zhaoxi Chen +7 more
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Permittivity and Permeability of Mullite‐SiC‐Whisker and Spinel‐SiC‐Whisker Composites
Journal of the American Ceramic Society, 1998Real and imaginary permittivity (ɛ′ and ɛ″, respectively) values were determined on mullite‐silicon carbide whisker (mullite‐SiC w ) composites, mullite‐ZrO 2 composites, and spinel‐SiC w composites, in the ...
Robert Ruh, Hirsch M. Chizever
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Mullite Whiskers from Precursor Gel Powders
Journal of the American Ceramic Society, 1990A mullite precursor sol was prepared by mixing boehmite and silica sols. On addition of 3.5 wt% F − ion as a 47% solution of HF, the mullite sol was gelled. The dried gel was ball‐milled and calcined at 1400°C for 1 h in an airtight container.
Mohamed G. M. U. Ismail +3 more
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Mullite-SiC Whisker and Mullite-ZrO2-SiC Whisker Composites
2006The effect of a transformation-toughened ZrO2 phase, and the incorporation of SiC whiskers on the microstructure and physical, mechanical and electrical properties were investigated. High-purity mullite-SiC whisker composites and mullite-ZrO2-SiC whisker composites were fabricated by hot pressing, using a matrix prepared by the alkoxide process ...
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Synthesis of Mullite Whisker from Fly Ash
Journal of the Korean Ceramic Society, 2005In this study, we attempted to recycle the fly ash as a mullite whisker with addition of Al₂O₃ to obtain the high yield of mullite whisker. During the reaction process, mullite whisker was formed with the reaction of amorphous α-Cristobalite and Anorthite above 1350℃.
Sung-Hwan Kim +2 more
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Preparation of mullite whiskers from topaz decomposition
Materials Letters, 2004An 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
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Mullite whisker felt and its application in composites
Materials Science and Engineering: A, 1991Abstract The Naval Surface Warfare Center has developed a process for the in situ preparation of 80% porous mullite whisker felt which consists of randomly oriented whiskers mutually intergrown, forming a rigid structure. The felt can be used as pre-forms for the preparation of metal and ceramic matrix composites.
D. Haught +3 more
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