Preparation of Fine Mullite Powder in a SHS Chemical Furnace System

Yu Yang; Yu Cheng Wang; Zheng Yi Fu; Wei Min Wang; Hao Wang; Jin Yong Zhang

doi:10.4028/www.scientific.net/AMR.66.115

Paper Titles

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Low-Temperature Sintering and Microwave Dielectric Properties of the Zn₂SiO₄ Ceramics
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Thermal Shock-Resistance Performance of Al₂TiO₅/Al₂O₃ Composites
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Effect of LaCl₃ on the Properties of LAS Ceramics
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Preparation of Fine Mullite Powder in a SHS Chemical Furnace System
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Investigation of Bipolar Resistance Switching Properties in SrTiO₃Thin Films with Symmetric Electrodes Structure
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The Effect of Oxygen Annealing on the Resistance Switching Properties of the La_0.7Ca_0.3MnO₃ Films
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Fabrication and Resistance-Switching Behaviors of NiO Thin Films by Thermal Oxidation of Evaporated Ni Films
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Synthesis of Metastable Tungsten Carbide Nanoparticles by Mechanochemical Alloying Process
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Preparation of Fine Mullite Powder in a SHS Chemical Furnace System

Abstract:

Within a very short heating period, fine mullite powder with practicle size below 1µm was obtained in a novel synthesis system, a self-propagating high-temperature synthesis (SHS) chemical furnace, from which the tremendous heating derived. The combustion reactants consisting of Ni, Al and TiC were chosen as a chemical furnace in this system to supply the heat, calcining temperature was increased at a heating rate of 1350K/min in the heating process, till the maximum temperature (1350°C). The rapid mullitization process was performed within 1 min, microstructure analysis indicated that small mullite grains (<50nm) were crystallized, fine mullite particles (<1µm) with narrow particle size distribution, favorable activity for sintering were derived. And significant grain growth was observed in mullite powder, when the combustion reactants consisting of Ni, Al and <30 mol.% TiC.