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- W842946490 abstract "The effects of the salt and the precursor pH on the synthesizing behavior and the morphology of mullite have been studied. Two kinds of mullite precursor sols were prepared by the dissolution of two kinds of salt (aluminum nitrate enneahydrate, Al(<TEX>$NO_3$</TEX>)<TEX>$_3$</TEX>ㆍ<TEX>$9H_2$</TEX>O; type I and aluminum sulfate 14∼18 water, (SO<TEX>$Al_4$</TEX>)<TEX>$_3$</TEX><TEX>$cdot$</TEX><TEX>$14∼18H_2$</TEX>O; type II) into the mixture of colloidal silica sol, respectively. Precursor pH of the sols was controlled to the acidic (pH= 1.5∼2) and basic (pH= 8.5∼9) conditions. The co-products with nitrate and sulfate were completely eliminated at <TEX>$500^{circ}C$</TEX> and <TEX>$850^{circ}C$</TEX>, respectively, which was confirmed by TG/DTA results. The synthesizing temperature of mullite phase was found to be above <TEX>$1200^{circ}C$</TEX> for pH= 1.5∼2 and above <TEX>$1300^{circ}C$</TEX> for pH= 8.5∼9 in type I. However, in type II, the synthesizing temperature of mullite was decreased to <TEX>$850^{circ}C$</TEX> for pH= 1.5∼2 and <TEX>$1100^{circ}C$</TEX> for pH= 8.5∼9. The grain size of the mullite synthesized at pH= 8.5∼9 was larger than that at pH= 1.5∼2 in overall heat-treated temperatures, showing smaller grain size in type II. Aspect ratio of the mullite grains was more increased at pH= 1.5∼2 than pH= 8.5∼9 in type I, showing similar aspect ratio at both pH conditions in type II. It was found that the synthesizing temperature and grain size were predominantly governed by the initial precursor pH and decomposition of the salt, with minor effect on the grain morphology." @default.
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- W842946490 date "2003-04-01" @default.
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- W842946490 title "Effects of Salt and Precursor pH on Synthesizing Behavior and Grain Morphology of Mullite in Aqueous System" @default.
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- W842946490 doi "https://doi.org/10.3740/mrsk.2003.13.4.251" @default.
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