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The Investigation of Viscosity and Crystallization of Glass Frit in Different Temperature

Author: MengZheng
Tutor: ShenJianXing；YueYuanZheng
School: Shandong Institute of Light Industry
Course: Materials Science
Keywords: CaO-Al2O3-SiO2-F system glass Viscosity Rheological properties Thermodynamic Properties Density Crystallization
CLC: TQ171.1
Type: Master's thesis
Year: 2010
Downloads: 132
Quote: 0
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Abstract


The purpose of this paper is to study the impact of fluoride silicate glass, chemical and physical properties, mainly between fluoride on the rheological properties of silicate glass, thermodynamic properties and crystallization behavior, and rheological properties and thermodynamic properties relationship. Original components using E glass add fluoride to adopt the traditional molten prepared CaO-Al2O3-SiO2-AlF3 (A series) and CaO-Al2O3-SiO2-CaF2 system (C series) glass, measuring the rotation method the viscosity of the glass melt in a certain cooling speed, combined with the differential scanning calorimetry, a glass transition temperature and heat capacity, respectively, using the VFT formula AG formula, AV formula and Mauro formula of the relationship of the viscosity of the glass melt temperature contemplated together. The study showed that: (1) Mauro formula the VFT formula, AG formula and AV formula has three parameters, can better describe the silicate melt viscosity temperature relationship, but the VFT formula, AG formula, AV formula is still a certain The practical significance. (2) A series C series with increasing fluorine content, the high temperature zone viscous increased the fluid activation enthalpy (ΔHη), ΔCp increases, the configurational entropy increases, the glass transition temperature is reduced brittleness coefficient smaller A series of viscous fluid activation enthalpy (ΔHη) is less than the C series, that is aluminum fluoride at the same temperature on the viscosity reducing effect is more obvious. It also found that there is no direct relationship between the ΔCp with brittle coefficient. (3) The study found that the entropy of the glass not only related with the temperature, but also with the brittleness coefficient, the glass transition temperature. VFT formula AV formula, the Mauro formula derived Eeq (T) / Eiso (T) in the vicinity of the Tg point substantially the same, and its value is equal to the AV formula brittleness coefficient. (4) Doweidar density model CaO-Al2O3-SiO2-F system glass [AlO3F] volume of the tetrahedron, and its value is a constant. Glass theoretical calculations obtained by this model basic density value of DC and the actual measured density values ??D match, so you can take advantage of the the glass density measurements as one of the means to control the production process. (5) through the study of the crystallization behavior of the glass, A2, A4, C4, C6, can be used as the original recipe of the E-glass fibers. From the high temperature cooling 1K/min speed to 700K, only surface crystallization A4, the generated crystals for CaF2 This suggests that EM Rabinovich shielding theory is applicable in the CaO-Al2O3-SiO2-F system glass. These conclusions profoundly expounded the fluoride glass rheological properties, thermodynamic properties and crystallization behavior of melt composition, the relationship between the melt properties and melt structure provides guidance E-glass fiber production reference.

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CLC: > Industrial Technology > Chemical Industry > Silicate > Glass Industry > Basic theory
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