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標題: | 高熱膨脹氧化物玻璃用於熱熔擠出及電絕緣特性之應用研究 Applications of High Thermal-Expansion-Coefficient Oxide Glass for Melt Extrusion and Electrical Insulation |
作者: | Po-Wei Wang 王柏崴 |
指導教授: | 韋文誠 |
關鍵字: | 玻璃,噴頭,熔融擠出,銅基合金,熱電偶, glass,extrusion nozzle,melt extrusion,Cu-based alloy,thermocouple, |
出版年 : | 2016 |
學位: | 碩士 |
摘要: | 本研究選用TiO2-Na2O-SiO2-B2O3 (TN-SB)氧化物玻璃,進行熔融擠出與熱電偶鍍膜兩種應用測試。經由調整TN-SB玻璃配方之B2O3/SiO2比例,以固相粉體混合,再以高溫1250 ˚C, 0.5 h熔融製備氧化物玻璃。透過數種熱分析量測不同配比的氧化物玻璃之玻璃轉換溫度、軟化點、熱膨脹係數及黏度。另外,利用碳化矽加熱棒與鐵鉻鋁加熱絲組合一加熱體,並以薄層陶瓷耐火綿、高氧化鋁澆注材製成之袖套,及高氧化鋁熱絕緣層形成之三層斷熱結構,組合為一可用於高溫熔融擠出之組件。在提供最高187 W輸出之電源供應下,此組件可於10分鐘內達1300 ˚C。另外,設計合適之加熱基板及送料裝置,利用此高溫噴頭,示範氧化物玻璃進行高溫熔融擠出之可行性,達到持續200 s之擠出時間與平均25 mm.s-1之擠出速度。研究工作並完成三種銅基熱電偶之玻璃鍍膜製備工作,並校正熱電偶之短時間與長時間(≤30 hr)之熱電位輸出,文中並討論高溫持溫產生之電位誤差之可能原因。 This study selected TiO2-Na2O-SiO2-B2O3 (TN-SB) glasses for the applications of melt extrusion and electrical insulation layer on Cu-based alloy thermocouple. First, the oxide glasses adjusting SiO2/B2O3 ratio were prepared by melt-quenched at 1250 ˚C for 30 min. Thermal properties of the glasses were investigated, including glass transition temperature (Tg), softening temperature (Ts), thermal expansion coefficient (CTE) and viscosity. Moreover, a melt extrusion module with an electromagnetic heating plate and a feeding system were assembled with a heating module, which combined a SiC heating element and Fe-Cr-Al heating wire for heating, and covering with thin ceramic fiber, castable outer sleeve, and a refractory support made by high Al2O3 ceramic board as thermal insulation layers. After providing 187 W power at most, the nozzle could reach 1300 ˚C in 10 min. Also, the formability of the oxide glass by extrusion was tried and capable of continuous extrusion over 200 s at an average speed of 25 mm.s-1. This work also completed a glass coating on various Cu-based thermocouples, calibrated the potential output in short and long ( 30 hr) terms. The possible causes of the deviation of the potential of the thermocouples were discussed. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/78116 |
DOI: | 10.6342/NTU201602485 |
全文授權: | 有償授權 |
顯示於系所單位: | 材料科學與工程學系 |
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