Effects of Fe2O3 on Manufacturing Insulating Glass-Ceramic from TFT-LCD Waste Glass and Basic Oxygen Furnace Slag
Date Issued
2012
Date
2012
Author(s)
Weng, Pei-Ya
Abstract
The objective of this research was to use thin film liquid crystal display (TFT-LCD) waste glass and basic oxygen furnace (BOF) slag as recycled materials to produce insulating glass-ceramic by thermal treatment. In addition, the effects of Fe2O3 content in the BOF slag on the insulating glass-ceramic’s crystalline phase, mechanical, dielectric and thermal expansion properties were also experimented and discussed in details. There were three experimental stages conducted in this study. The first stage was to fix the weight ratio of TFT-LCD waste glass to BOF slag by adding pure reagent of Fe2O3 in order to analyze the relevance of Fe2O3 content to the characteristics of the products, such as crystalline phase, mechanical and dielectric properties. The second stage was to adjust the input ingredients of BOF slag which contains various Fe2O3 content to produce insulating glass-ceramic with excellent mechanical and dielectric properties. The third stage was to analyze the consistency of the effects of Fe2O3 on the production of insulating glass-ceramic from the first and second stage.
The results indicated that Fe2O3 could act as nucleating agent to promote crystallization at lower thermal treatment temperature and stimulated the formation of a wide variety of crystal types. In addition, increase in Fe2O3 content would enhance glass-ceramic’s mechanical properties including density and flexural strength. However, dielectric properties did not improve with Fe2O3 addition.
When TFT-LCD waste glass and BOF slag was blended in the ratio of 7:3 while BOF slag was prepared with pre-BOF slag and post-BOF slag in the ratio of 5:5, under heat treatment temperature of 820℃, the insulating glass-ceramic exhibited satisfactory characteristics with product density (2.64 g/cm3), bending strength (110 MPa), dielectric constant (8.8), dissipation factor (0.0043), quality factor (235), and dielectric loss factor (0.037). The final product of glass-ceramic had good mechanical strength and dielectric properties. Therefore, this research concluded that the adjustment of the pre/post BOF slag ratio would effectively improve insulating glass-ceramic properties and achieve the goal of reducing the use of additional material and energy.
According to the results of first and second stage, it demonstrated that the differences of crystalline phase, mechanical and dielectric properties caused by the Fe2O3 content were consistent. Therefore, it is promising to manufacture insulating glass-ceramic from TFT-LCD waste glass and BOF slag, in which Fe2O3 would play one of the main affecting factors.
Subjects
TFT-LCD Waste Glass
Basic Oxygen Furnace Slag
Insulating Glass-Ceramic
Mechanical Properties
Dielectric Properties
Type
thesis
File(s)![Thumbnail Image]()
Loading...
Name
ntu-101-R99541202-1.pdf
Size
23.54 KB
Format
Adobe PDF
Checksum
(MD5):84a19332153d732cd56da9784e567d1f