Phase diagram for the SiF4 join in the system SiO2-Al2O3-SiF4

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Dow Chemical Co, Midland, United States [1 ]
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J Am Ceram Soc | / 11卷 / 2965-2968期
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Aluminum compounds - Decomposition - Phase diagrams - Phase equilibria - Phase interfaces - Silicon compounds - Thermal effects - Vapor pressure;
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摘要：
Alumina reacts with 1 atm of SiF4 below 660°±7 °C to form AlF3 and SiO2. At higher temperatures the product is a mixture of fluorotopaz and AlF3. Mixtures of fluorotopaz and AlF3 decompose in 1 atm of SiF4 at 973°±8 °C and form tabular α-alumina. The equilibrium vapor pressure of SiF4 above mixtures of fluorotopaz and AlF3 is log p(atm) = 9.198-11460/T(K). Fluorotopaz itself decomposes at 1056°±5 °C in 1 atm of SiF4 to give acicular mullite, 2Al2O3&middot1.07SiO2. Alumina and mullite are stable in the presence of 1 atm of SiF4 above 973° and 1056 °C, respectively. The phase diagram of the system SiO2-Al2O3-SiF4 shows only gas-solid equilibria.
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