Investigation on Synthesis of Sintered Mullite from Low-medium Grade Kyanite

doi:10.19691/j.cnki.1004-4493.2019.01.004

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Investigation on Synthesis of Sintered Mullite from Low-medium Grade Kyanite

YE Hang, SUN Gaoyang, ZHANG Haibo, LI Yanjing, GAO Changhe, LI Yong, YE Fangbao

Published:2019-07-02

Abstract

Abstract: Sintered mullite is prepared by kyanite powder with Al2O3 content of 45% and 50% (Yinshan, Nanyang City, China), and the industrial alumina is added to control the chemical composition. The different series of sintered mullite according to the Al2O3 content (45%-70%) are designed. The raw materials are mixed and compacted, and then sintered at different temperatures. Physical properties, phase composition, microstructure and refractoriness under load of the synthesized samples are characterized by physical property test, XRD, SEM and RUL test, in order to confirm the quality of sintering and the relationship between temperature and mullitization reaction. The results show that the sintered mullite from low-medium grade kyanite has well developed mullite crystals and a continuous staggered network structure is formed, which has a significant contribution to increasing the high temperature performance of mullite.

Key words: kyanite, industrial alumina, sintering, phase composition, microstructure

YE Hang, SUN Gaoyang, ZHANG Haibo, LI Yanjing, GAO Changhe, LI Yong, YE Fangbao. Investigation on Synthesis of Sintered Mullite from Low-medium Grade Kyanite[J]. , DOI: 10.19691/j.cnki.1004-4493.2019.01.004.

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Investigation on Synthesis of Sintered Mullite from Low-medium Grade Kyanite

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