Microwave sintering of mullite-Al2O3 from kaolin precursor
نویسندگان
چکیده
منابع مشابه
Microwave Sintering of Mullite
Microwave sintering possesses unique attributes and has the potential to be development as a new technique for controlling microstructure and to improve the properties of advanced ceramics. Because microwave radiation penetrates most ceramics, uniform volumetric heating is possible. Thermal gradients, which are produced during conventional sintering because of conductive and radioactive heat tr...
متن کاملMicrostructural evolution of mullite during the sintering of kaolin powder compacts
Kaolin particles are usually ̄aky in shape. In the present study, kaolin powder compacts were prepared by applying the diepressing technique. The kaolin ̄akes tend to lie down on the plane which is perpendicular to the die-pressing direction. The powder compact thus shows anisotropic shrinkage after ®ring. A series of phase transformations take place as the kaolin is ®red at elevated temperatur...
متن کاملProduction of γ-Al2O3 from Kaolin
The paper reports a process for synthesis of γ-alumina from kaolin. Kaolin was transformed to meta-kaolin by calcination at 800 ̊C for 2h. γ-alumina powder was synthesized through extracting alumina from metakaolin via H2SO4 and meta-kaolin reactions and consequently precipitation in ethanol, which led to form the aluminum sulfate. The precipitated aluminum sulfate was dried and calcined at 900 ̊...
متن کاملSintering of a-Al2O3-seeded nanocrystalline g-Al2O3 powders
This paper demonstrates that seeding nanocrystalline transition alumina powders is a viable option for producing high quality, alumina-based ceramics. By using a-Al2O3 concentrations of 51.25 wt.% a-Al2O3 seed particles (equivalent to 5 10 seeds/cm of g-Al2O3) the sintering temperature is reduced from 1600 C for unseeded g-Al2O3 to 1300–1400 C in dry pressed powders. The scale of the sinteredmi...
متن کاملElectrospun mullite fibers from the sol–gel precursor
Mullite fibers with diameters from 400 nm to 10 lm were fabricated from the sol–gel precursors using the electrospinning method. During the precursor synthesis, the hydrolysis was controlled to obtain highly viscous mullite sols. The viscous mullite sols were then diluted and mixed with a small amount of polyethylene oxide. Controlling the precursor rheology and spinning conditions, we obtained...
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ژورنال
عنوان ژورنال: Materials Research
سال: 2014
ISSN: 1516-1439
DOI: 10.1590/1516-1439.281114