nfluences of Particle Size and Sintering Time on Insulating Glass Ceramics Sintered from TFT-LCD Waste Glass and BOF Slag
Date Issued
2012
Date
2012
Author(s)
Lee, Chen-Fang
Abstract
The study aims to decide the optimal heat treatment for reusing the glass ceramics in insulating. Influence of particle size: D1(D50:11 μm), D2(D50:25 μm), D3(D50:59 μm) and sintering time: 0.5 hour, 1 hour, 2 hours on physical properties, dielectric properties and bending strength are considered. The glass ceramics sintered from TFT-LCD waste glass (Thin Film Transistor-Liquid Crystal Display) mixed BOF slag (Basic Oxygen Furnace Slag) with weight ratios 7:3, adding 15 wt% MgO and 15 wt% Al2O3. The main crystalline are enstatite(MgSiO3), anorthite(CaAl2Si2O8), wollastonite(CaSiO3) and forsterite(Mg2SiO4).
Results show that glass ceramics of D1 and sintering 2 hours ocurr densification, crystallization and higher bending strength at lower temperature.
Before crystallization, dielectric constant and quality factor (Q factor) of D1 is higher because glass ceramics of D1 are much denser. After crystallization, there are no effects of particle size on dielectric constant, but Q factor decreases about 80%. However, as sintering temperature rise and crystalline having high Q factor appear, Q factor increases smoothly. Moreover, longer sintering time causes the occurrence of enstatite, which lead to Q factor drops and coefficient of thermal expansion increase.
On the effect of particle size, D1 performe better in bending strength and Q factor than D2. On sitering time, though longer sintering time lead to higher bending strength, Q factor cannot increase during temperature rising. As a result, D1, 900°C, 0.5hour which have well bending strength 158.8MPa, dielectric constant 10.2 and Q factor 100.1 is the most suitable heat treatment for insulating glass ceramics.
On the aspect of reusing, smaller particle is more effective and economics than longer sintering time.
Subjects
TFT-LCD waste glass
BOF slag
insulating glass ceramics
bending strength
dielectric properties
Type
thesis
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