Author： Zhang Yabin
Publisher： Taylor & Francis Ltd
ISSN： 1042-6914
Source： Materials and Manufacturing Processes, Vol.26, Iss.4, 2011-04, pp. : 649-653
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Abstract
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.
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