Al2O3-SiO2溶胶对莫来石耐火材料性能的影响
JOURNAL OF ANHUI UNIVERSITY OF TECHNOLOGY(NATURAL SCIENCE)(2009)
Abstract
采用溶胶-凝胶法制备Al2O3-SiO2溶胶粉末,用制备好的Al2O3-SiO2溶胶粉末作为结合剂合成莫来石耐火材料.研究Al2O3,SiO2和Al2O3-SiO2溶胶的不同配比对莫来石耐火材料性能的影响.结果表明:在不加入Al2O3情况下,SiO2微粉的加入量在77%~87%范围内逐渐增加时,耐火材料的体积密度增大,显气孔率降低,吸水率变化不明显;当加入30%的SiO2微粉时,随着Al2O3微粉加入量在52%~62%范围内逐渐增加,试样的体积密度先增后减,在加入量为57%时达到最高;当Al2O3-SiO2粉末加入量2%~4%时,显气孔率逐渐上升,体积密度也增加,当加入量超过5%时,耐火材料的体积密度下降,显气孔率逐渐上升.
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mullite refractories properties
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