Interdiffusivities matrix of CaO-Al2O3-SiO2 melt at 1723 K to 1823 K
Interdiffusivities matrix of CaO-Al2O3-SiO2 melt at 1723 K to 1823 K
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CaO-Al2O3-SiO2 熔体在 1723 K 至 1823 K 时的互扩散系数矩阵
DOI：
10.1007/bf02658629
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发表时间：
1977
期刊：
影响因子：
--
通讯作者：
K. Goto
中科院分区：
文献类型：
--
作者：
H. Sugawara;K. Nagata;K. Goto
摘要石灰、氧化铝和二氧化硅的三元氧化物混合物被预熔和淬火以生产玻璃圆柱体。从六种不同成分的混合物中选择扩散偶，使得平均成分可以是40wt%CaO-20wt%A12O3=40wt%SiO2.在1723K-1823K温度下，通过52次成功的扩散实验，得到了由Matano界面定义的互扩散系数矩阵：1
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$$\BEGIN D_{10-10}^{30}=8.9\FRAC{-11}\EXP(-\FRAC{{253,700}}{{RT}})(m^2/S)\hFILL D_{10-20}^{30}=-2.5\FRAC{-11}\EXP(-\FRAC{{194,300}}{{RT}})(m^2/S)\HFILL\END$$
2.
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$$\BEGIN D_{20-10}^{30}=-4.0\FRAC{-11}\EXP(-\FRAC{{177,600}}{{RT}})(m^2/S)\hFILL D_{20-20}^{30}=6.12\FRAC{-11}\EXP(-\FRAC{{318,400}}{{RT}})(m^2/S)\hFILL\END{GROGRED}$
其中，符号10、20和30分别表示CaO、Al_2O_3和SiO_2，活化能以焦耳/摩尔为单位。结合库珀平行四边形讨论了得到的扩散组成路径。上述互扩散系数的组成依赖关系是由目前氧化物体系在液态下所有组成范围内的准二元互扩散系数估算的。
AbstractTernary oxide mixtures of lime, alumina, and silica were premelted and quenched to produce glassy cylinders. A diffusion couple was selected from the mixtures of six different compositions in such a way that the average composition could be 40 wt pct CaO-20 wt pct A12O3 = 40 wt pct SiO2. Penetration curves of the components were measured with a X-ray microprobe analyzer.The interdiffusivities matrix defined with the Matano interface has been obtained from 52 successful diffusion runs at 1723 K to 1823 K as follows;1
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$$\begin{gathered} \tilde D_{10 - 10}^{30} = 8.9 \times 10^{ - 11} \exp ( - \frac{{253,700}}{{RT}})(m^2 /s) \hfill \\ \tilde D_{10 - 20}^{30} = - 2.5 \times 10^{ - 11} \exp ( - \frac{{194,300}}{{RT}})(m^2 /s) \hfill \\ \end{gathered} $$
2
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$$\begin{gathered} \tilde D_{20 - 10}^{30} = - 4.0 \times 10^{ - 11} \exp ( - \frac{{177,600}}{{RT}})(m^2 /s) \hfill \\ \tilde D_{20 - 20}^{30} = 6.12 \times 10^{ - 11} \exp ( - \frac{{318,400}}{{RT}})(m^2 /s) \hfill \\ \end{gathered} $$
where symbols, 10, 20, and 30 mean CaO, A12O3, and SiO2, respectively, and the activation energies are in Joules per mole.The diffusion composition paths obtained are discussed in relation to Cooper’s parallelogram. The composition dependency of the above interdiffusivities is estimated from the quasibinary interdiffusivities in all composition ranges of the present oxide system in liquid state.