Materialization Study on Transformation of MgO-Al2O3-SiO2 Glass Ceramic from TFT-LCD Waste Glass with Additives
Date Issued
2011
Date
2011
Author(s)
Chen, Hsuan-Yu
Abstract
This study aimed to use TFT-LCD (Thin Film Transistor Liquid Crystal Display) waste glass from optoelectronics industrial wastes with MgO, Al2O3, and ZrSiO4 additives to produce excellent mechanical and dielectric properties through thermal treatment.
There were three experimental stages in this study. The first stage was cone test of TFT-LCD waste glass with additives, in order to obtain the blending ratio of the components for the melting temperature. The second stage was to determine the thermal treatment conditions based on glass transition temperature and crystallization temperature of the differential thermal analysis at various blending ratio and temperatures to crystallization, and then to observe crystal phase by X-ray powder diffraction analysis. The third stage was for selected ratio of MAS (MgO-Al2O3-SiO2) glass-ceramic system in order to assess the potential of insulting glass-ceramic produced from TFT-LCD waste glass with additives as raw materials to analyze the dielectric properties, compressive strength and flexural strength.
The experimental results showed that the temperature of cone test of TFT-LCD waste glass with MgO additive has been decreased, and the MgO in the glass-ceramic system has positive effect on melting. Crystal phase analysis showed that the TFT-LCD waste glass added 20 wt.% MgO and 15~20 wt.% Al2O3 via 1000℃ of thermal treatment could produce Cordierite phase, and the additive of ZrSiO4 in the TFT-LCD waste glass could help crystal phases to be generated at lower thermal treatment temperature. It demonstrated that the additive of ZrSiO4 plays a key role to energy saving and crystallization of cordierite.
The TFT-LCD waste glass added 20 wt.% MgO, 15 wt.% Al2O3 and 15 wt.% ZrSiO4 at heat temperature 920℃ showed the density of 2.78 g/cm3, the flexural strength of 172.820 MPa, compressive strength of 402.34 MPa, dielectric constant of 10.290 and the dielectric loss factor of 0.0172. It has good mechanical and dielectric properties, and in accordance with the required standard of insulated glass ceramics.
Subjects
TFT-LCD Waste Glass
Glass-Ceramic
MAS System
Mechanical Properties
Dielectric Properties
Type
thesis
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