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- W2370687862 abstract "Sol-gel process is a promising method for making ceramic materials.In this paper,Al_2O_3 precursor sols were synthesized by refluxing Al powder and aqueous AlCl_3·6H_2O solution.After a series of hydrolysis-condensation reactions,stable and transparent precursor sols were formed.PVA was then added as fiber forming aid.Precursor fibers were produced by dry-spinning.After heat-treatment,the gel fibers were transformed into ceramic fibers.The chemical structure of the gels was characterized by IR spectroscopy.The sintering process of the alumina fibers was analyzed through DTA-TG and XRD.The morphology of the fibers was examined by SEM.The research shows that the polycrystalline alpha alumina fibers could be attained after heat treatment in air and at 1200℃.The addition of MgCl_2 would significantly improve the microstructure of the fibers,reducing the number density of cracks,when it was added together with Al powder and AlCl_3·6H_2O,but the same beneficial effects were not obtained when it was directly introduced into the Al_2O_3 precursor sols.The underlining reasons were discussed." @default.
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- W2370687862 date "2006-01-01" @default.
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- W2370687862 title "Preparation of the Polycrystalline Alumina Fubers by Sol-gel Progress" @default.
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