Mullite Fibers Prepared by Sol-Gel Method Using Aluminum Chloride Aluminum Isopropoxide and Tetraethylorthosilicate
Mullite fibers with good flexibility were prepared from an aqueous water solution of aluminum chloride (AC), aluminum isopropoxide (AIP), tetraethylorthosilicate (TEOS) by the sol-gel process. Aluminosilicate spinnable sol (pH=2) with the stoichiometric mullite composition (Al:Si = 3:1, AIP/AC = 2:1) was prepared. The removal of organic and chlorine was completed at 800°C. The complete transformation to mullite was observed at 1200°C by X-ray diffraction (XRD). The lateral and circumferential cracks were showed in the results of scanning electron microscopy (SEM) when fibers were sintered at 10°C min-1. It was useful for preparation of fibers with smooth surface and uniform diameter by controlling the sintering schedule.
Keywords: AlCl3·6H2O; Drying; Fiber; Mullite; Process; Reaction; Sintering; Sol-gel
Document Type: Research Article
Affiliations: 1: State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, China 2: Material Science and Engineering College, China University of Mining and Technology, Xuzhou, China
Publication date: 01 April 2011
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