以二階段熱處理TFT-LCD廢玻璃與轉爐石製備玻璃陶瓷之研究

Abstract

摘要 本研究係以影像顯示產業廢棄物TFT-LCD (Thin Film Transistor Liquid Crystal Display) 廢玻璃與煉鋼爐渣轉爐石，經過一階段、二階段熱處理及添加調質劑以製成玻璃陶瓷材料並量測其機械性質與介電性質。 實驗結果顯示TFT-LCD廢玻璃與轉爐石比為7:3(以下簡稱配比73)時可形成CAS系玻璃陶瓷，TFT-LCD廢玻璃與轉爐石比為7:3並添加調質劑20%(w/w) MgO與20%(w/w) Al2O3(以下簡稱配比73A)可形成MAS系玻璃陶瓷。研究結果顯示添加調質劑與二階段熱處理可明顯提升機械性質，配比73在經過640℃2小時、840℃ 30分鐘二階段熱處理之密度為2.77 g/cm3，抗壓強度為563MPa，抗折強度為206MPa，介電常數為7.28、介電損失因子為0.0165；配比73A在經過640℃2小時、980℃30分鐘二階段熱處理之密度為2.91 g/cm3，抗壓強度為717MPa，抗折強度為248MPa，介電常數為7.59、介電損失因子為0.097，具有良好之機械性質及介電性質，並符合絕緣玻璃陶瓷之特性標準，因此本研究由TFT-LCD廢玻璃與轉爐石形成之玻璃陶瓷具有資材化作為絕緣陶瓷之潛力。

Abstract The influence of two-stage heat treatment and additives like MgO、Al2O3 on the dielectric properties and mechanical properties of glass-ceramics made from a combination of TFT-LCD(Thin Film Transistor Liquid Crystal Display) waste glass and Basic Oxygen Furnace Slag(BOF) is investigated. The system of glass-ceramic shifted from CAS to MAS system was through 20%(w/w) MgO and 20%(w/w) Al2O3 added into the martrix(TFT-LCD waste glass: BOF=7:3). The experiment demonstrated that the density increased with temperature increase. Moreover, both adding additives and two-stage heat treatment improved mechanical properties due to production of forsterite crystal. Under two-stage heat treatment process with 640℃ for 2 hours followed by 980℃ for 30minutes, a material with high density (2.91 g/cm3),high bending strength (256MPa), high compressive strength(717MPa) ,low dielectric dielectric constant(7.59) and low dielectric loss factor(0.097) were resulted, which met the required standard of insulated glass-ceramic.