TFT-LCD廢玻璃添加調質劑形成MAS系玻璃陶瓷之研究

Abstract

本研究旨在以影像顯示產業之廢棄物TFT-LCD (Thin Film Transistor Liquid Crystal Display) 廢玻璃添加MgO、Al2O3及ZrSiO4等調質劑後，經過熱處理程序以製成具有優良機械性質、介電性質及高附加價值之絕緣玻璃陶瓷材料。 本研究分為三階段進行，第一階段為高溫試驗錐實驗，將TFT-LCD廢玻璃添加調質劑後進行試驗錐實驗，以獲得各實驗配比之成分比例對熔流溫度之影響；第二階段為進行熱差分析判斷玻璃轉移溫度及結晶溫度，以決定熱處理條件，將實驗配比於不同熱處理溫度下使其結晶，再以X-ray粉末繞射分析觀察晶相種類；第三階段為選擇符合MAS系玻璃陶瓷之配比進行介電性質分析、抗壓強度分析及抗折強度分析，探討上述TFT-LCD廢玻璃產生之MAS系玻璃陶瓷再利用之可行性。 實驗結果顯示添加MgO之實驗配比，其試驗錐特徵溫度有下降之情形，因此MgO於玻璃陶瓷系統中有助融之效果；由晶相分析結果發現TFT-LCD廢玻璃添加20 wt.% MgO及15~20 wt.% Al2O3可於熱處理溫度1000℃產生堇青石 (Cordierite) 晶相，而添加ZrSiO4於實驗配比中有助於堇青石晶相於較低熱處理溫度產生，顯示ZrSiO4對堇青石之析出及節能可扮演關鍵作用。 本研究TFT-LCD廢玻璃添加20 wt.% MgO、15 wt.% Al2O3及15 wt.% ZrSiO4之配比於熱處理溫度920℃之密度為2.78 g/cm3、抗折強度為172.82 MPa、抗壓強度為402.34 MPa、介電常數為10.290及介電損失因子為0.0172，具有良好之機械性質及介電性質，且皆符合絕緣玻璃陶瓷之特性標準，因此本研究由TFT-LCD廢玻璃添加調質劑產出之玻璃陶瓷具有資材化作為絕緣陶瓷之潛力。

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.