Phase Diagram for the SiF4 Join in the System SiO2-Al2O3-SiF4

Phase Diagram for the SiF4 Join in the System SiO2-Al2O3-SiF4
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DOI:
10.1111/j.1151-2916.1996.tb08734.x
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发表时间:
1996-11
影响因子:
3.9
通讯作者:
J. R. Moyer
J. R. Moyer
中科院分区:
材料科学2区
文献类型:
--
作者:
J. R. Moyer

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氧化铝在660°± 7°C以下与1 atm的SiF 4反应形成AlF 3和SiO2。在较高温度下,产物是氟黄玉和AlF 3的混合物。氟黄玉和AlF 3的混合物在973°± 8°C下在1个大气压的SiF 4中分解并形成片状α-氧化铝。在氟黄玉和AlF_3的混合物上,SiF_4的平衡蒸气压为logp(atm)= 9.198 - 11460/T(K)。Fluorotopaz本身在1056°± 5°C下在1 atm的SiF 4中分解,得到针状莫来石2Al2O3.1.07SiO2。氧化铝和莫来石分别在高于973° C和1056°C的1个大气压的SiF 4存在下是稳定的。SiO_2-Al_2O_3-SiF_4系统的相图仅显示气固平衡。
Alumina reacts with 1 atm of SiF4 below 660°± 7°C to form A1F3 and SiO2. At higher temperatures the product is a mixture of fluorotopaz and AIF3. Mixtures of fluorotopaz and AIF3 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, 2Al2O3.1.07SiO2. 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.