SGER: Thermochemical/Thermophysical Aspects of the Float-Glass Process as Applied to Glass-Ceramic and Other Complex, High-Temperature Aluminosilicate Melts

摘要：将浮法工艺技术应用于复杂成分铝硅酸盐玻璃和玻璃陶瓷熔体的无缺陷平板的制造，需要对复杂硅酸盐与熔融金属或金属合金之间反应的热力学和动力学有基本的了解。该项目计划研究硅酸盐熔体还原、金属-浮子-介质氧化的反应和动力学机制，以及作为浮子过程热化学/热物理基础的金属和硅酸盐介质之间随之发生的化学扩散。该研究旨在确定最佳的化学方法，以成功漂浮复杂的硅酸盐熔体，其中包含大量的过渡金属氧化物。实验研究将仔细研究镁铝硅酸盐（MAS）熔体及其过渡金属阳离子掺杂衍生物与熔融锡和锡合金接触的化学动力学。具体来说，待研究的基体MAS组成为1MgO-1Al2O3-4SiO2（摩尔基），为完全聚合的熔体；被取代的过渡金属阳离子（掺杂；最初约为5个阳离子摩尔%水平）一种是Fe2+-Fe3+，另一种是Ti4+。玻璃熔体与纯金属和金属合金的反应将用离子后向散射光谱以及通过电子探针的能量和波长色散x射线光谱来表征。该项目由探索性研究项目小额赠款资助。

Abstract - Cooper - 9707934 Application of the float process technique to the fabrication of defect-free flat panels of complex-composition aluminosilicate glass and glass-ceramic melts requires a fundamental understanding of the thermodynamics and kinetics of reactions between the complex silicate and the molten metal or metal alloy upon which it is poured. The PI plans to study the reactions and kinetic mechanisms of silicate melt reduction, metal-float-medium oxidation and the consequent chemical diffusion between the metal and silicate media that are the thermochemical/thermophysical bases of the float process. The study is designed to identify the optimal chemical approach to successfully floating a complex silicate melt that incorporates a significant amount of a transition metal oxide in its composition. The experimental study will scrutinize the chemical dynamics of a magnesium aluminosilicate (MAS) melt and its transition metal cation-doped derivatives in contact with molten tin and tin alloys. Specifically, the base MAS composition to be studied is 1MgO-1Al2O3-4SiO2 (molar basis), which is a fully polymerized melt; transition metal cations to be substituted (doped-in; initially at approximately a 5-cation mol.% level) are Fe2+-Fe3+ in one case and Ti4+ in another. The reactions of the glass melt with the pure metal and metal alloy(s) will be characterized both with ion backscattering spectroscopy as well as with energy- and wavelength-dispersive x-ray spectroscopies via an electron probe. The project is being funded under the Small Grants for Exploratory Research program.