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Preparation of Nitrogen-Doped Mullite Fiber by Nitridation of Silica–Alumina Gel Fiber in Ammonia

Authors

  • Li Zhang,

    1. National Key Laboratory of Thermostructure Composite Materials, Northwestern Polytechnical University, Xi'an, China
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  • Litong Zhang,

    1. National Key Laboratory of Thermostructure Composite Materials, Northwestern Polytechnical University, Xi'an, China
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  • Zhijun Lin,

    1. College of Materials, Fujian Key Laboratory of Advanced Materials, Xiamen University, Xiamen, China
    2. Key Laboratory of High Performance Ceramic Fibers, Ministry of Education, Xiamen, China
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  • Yan Jiang,

    1. College of Materials, Fujian Key Laboratory of Advanced Materials, Xiamen University, Xiamen, China
    2. Key Laboratory of High Performance Ceramic Fibers, Ministry of Education, Xiamen, China
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  • Jing He,

    1. College of Materials, Fujian Key Laboratory of Advanced Materials, Xiamen University, Xiamen, China
    2. Key Laboratory of High Performance Ceramic Fibers, Ministry of Education, Xiamen, China
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  • Siwei Li

    Corresponding author
    1. College of Materials, Fujian Key Laboratory of Advanced Materials, Xiamen University, Xiamen, China
    2. Key Laboratory of High Performance Ceramic Fibers, Ministry of Education, Xiamen, China
    • National Key Laboratory of Thermostructure Composite Materials, Northwestern Polytechnical University, Xi'an, China
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Author to whom correspondence should be addressed. e-mail: swli@xmu.edu.cn.

Abstract

Nitrogen-doped mullite fibers were first synthesized through the nitridation of Al2O3SiO2 gel fibers in NH3. The results showed that nitrogen take-up began at 800°C, reached the maximum at 900°C, and then decreased with increasing temperature. The ceramic fibers nitridated at 900°C were essentially amorphous, but contained a small amount of nano-sized AlSi spinel crystals. Mullite was formed after nitridation at 1200°C, accompanied by crystallization of χ-SiAlON and δ-Al2O3. The incorporation of nitrogen resulted in the formation of a variety of nitrogen-containing crystalline phases. The grain size of the mullite fibers can be adjusted by changing of the nitrogen content.

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