Results 151 to 160 of about 23,557 (186)

Research on Synthesis of Mullite Whiskers by Kyanite

Applied Mechanics and Materials, 2013
In this paper, thermal barrier materials of mullite whiskers made by kyanite is studied, take -325~+400 mesh kyanite as raw material, the firing conditions is that nucleation temperature is 1150°C and crystallization temperature is 1250°C; the adding method of catalyst (AlF3) is external additive.
Ai Hong Guo, Li Nan Tian, Fu Sheng Niu, Li Jun Yin   +3 more
openaire   +1 more source

Processing of Mullite Whiskers from Kaolin

Advanced Materials Research, 2007
Mullite 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, Tae Young Yang, Seog Young Yoon, Ron Stevens, Hong Chae Park   +4 more
openaire   +1 more source

Magnetic Submicron Mullite Coatings with Oriented SiC Whiskers

ACS Applied Materials & Interfaces, 2018
Addressing 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, James Townsend, Pavel Aprelev, Yu Gu, Ruslan Burtovyy, Igor Luzinov, Konstantin G. Kornev, Fei Peng   +7 more
openaire   +2 more sources

Permittivity and Permeability of Mullite‐SiC‐Whisker and Spinel‐SiC‐Whisker Composites

Journal of the American Ceramic Society, 1998
Real 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
openaire   +1 more source

Mullite Whiskers from Precursor Gel Powders

Journal of the American Ceramic Society, 1990
A 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, Hiroshi Arai, Zenjiro Nakai, Tokuji Akiba   +3 more
openaire   +1 more source

Synthesis of Mullite Whisker from Fly Ash

Journal of the Korean Ceramic Society, 2005
In 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, Hee-Gon Bang, Sang-Yeup Park   +2 more
openaire   +1 more source

Mullite whisker felt and its application in composites

Materials Science and Engineering: A, 1991
Abstract 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, I. Talmy, D. Divecha, S. Karmarkar   +3 more
openaire   +1 more source

Preparation of mullite whisker skeleton porous ceramic

Ceramics International, 2015
Abstract Sillimanite whisker skeleton porous ceramic was firstly prepared by an appropriate firing process from kaolinite and ammonium hexafluoroaluminate (AHA) as raw materials, then mullite whisker and corundum were produced by firing the sillimanite whisker skeleton at 1400 °C.
Linfeng Xu, Xiuan Xi, Anze Shui, Wenli Zhu   +3 more
openaire   +1 more source

Preparation and characterization of mullite microspheres based porous ceramics with enhancement of in-situ mullite whiskers

Ceramics International, 2019
Abstract High-strength insulating ceramic materials were prepared using lightweight mullite microspheres with dense surfaces and high internal porosity as the main raw material and silica sol as a binder. The effects of AlF 3 ·3H 2 O content on the in situ formation and growth of mullite whiskers were analyzed by X-ray diffraction and scanning ...
Ping Yi, Pengda Zhao, Deqiang Zhang, Han Zhang, Huizhong Zhao   +4 more
openaire   +1 more source

Development of techniques for the production of nickel reinforced with mullite whiskers

Soviet Powder Metallurgy and Metal Ceramics, 1968
1. An examination was made of several techniques for the production of nickel reinforced with randomly-distributed mullite (3Al2O3 · 2SiO2) whiskers. The infiltration technique was found to be unsuitable because of the absence of wetting between nickel and mullite and the transformation of needle-shaped mullite into equiaxedα-Al2O3 grains.
D. M. Karpinos, L. I. Tuchinskii, A. I. Zhovner, I. G. Donets   +3 more
openaire   +1 more source