Dissolution of alumina in mold fluxes
Dissolution of alumina in mold fluxes
复制标题
DOI：
10.1007/s11663-997-0094-3
复制
发表时间：
1997-04
期刊：
影响因子：
--
通讯作者：
X. Yu;R. Pomfret;K. Coley
中科院分区：
文献类型：
--
作者：
X. Yu;R. Pomfret;K. Coley
在1530℃下，用旋转手指法测定了氧化铝在cao - al2o3 - sio2 - na2o - caf2体系中在一定助熔剂中的溶解度和溶解速率。所研究的所有通量的溶解度约为38%。溶解动力学与旋转圆盘的leich - chochran方程相关联，并用于确定氧化铝的有效扩散系数。有效扩散系数与助熔剂粘度成反比，与之前对cao - al2o3 - sio2渣的研究结果非常吻合。这与埃林关系或斯托克斯-爱因斯坦关系是一致的。当使用Stokes-Einstein关系时，得到的扩散单元尺寸的值为1.81 Å，这更合理，这通常不是硅酸盐渣的预期值。这一结果是由这些助熔剂中的低聚合水平解释的。
The solubility and rate of dissolution of alumina in a range of mold fluxes in the CaO-Al2O3-SiO2-Na2O-CaF2system have been measured at 1530 °C using the rotating finger method. The solubilities were approximately 38 pct for all fluxes studied. The kinetics of dissolution were correlated with the Levich-Chochran equation for a rotating disc and used to determine the effective diffusivity of alumina. The effective diffusivity was inversely proportional to the viscosity of the flux and showed excellent agreement with previous work on CaO-Al2O3-SiO2slags. This is in keeping with either the Eyring relation or the Stokes-Einstein relation. The value obtained for the size of the diffusing unit when the Stokes-Einstein relation was used, 1.81 Å, was more reasonable, which is not normally expected for silicate slags. This result is explained by the low level of polymerization in these fluxes.