- 學位論文
氧化鉍-氧化鋅變阻器之製備與其特性研究
Preparation and Characterization of Bi2O3-ZnO Varistors
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摘要
變阻器(Varistor)具有非線性的電壓-電流特性，它可以使用於電子系統中作為穩壓及吸收突波之功能。本研究中氧化鋅變阻器樣品的製備為運用固態反應法，且添加Bi2O3成為Bi2O3-ZnO變阻器。 為了可以提升變阻特性，意即提升崩潰電壓(Breakdown voltage, Vb)及非線性參數(Nonlinearity parameter, α)，對粉體使用煅燒處理和添加Na2O-B2O3玻璃之後再將其置於不同燒結溫度下燒結，用於研究討論煅燒、添加Na2O玻璃和燒結溫度對微觀結構及電性的影響。 研究中以場發射電子顯微鏡(FE-SEM)觀察坯體之顯微結構、以X-光繞射儀(XRD)鑑定結晶相，變阻性質方面則是使用系統電源電錶(Source meter)量測。 實驗的結果顯示下列三點: 1.氧化鋅粉體經過煅燒程序可以得到較好的變阻特性。 2.低溫燒結可以比高溫燒結得到更好的變阻特性。 3.添加玻璃至原始配方中即可改善該配方的變阻特性。 整體而言，Bi2O3-ZnO變阻器，在粉體經過煅燒處理並添加玻璃，而後設定1050˚C燒結可得到最佳的變阻性質:非線性參數為24.19，崩潰電壓為22.14 V。
並列摘要
The varistor has nonlinearity characteristic, which can be used in the electronic system to absorb the surge and maintain the constant voltage. In this study, ZnO varistors doped with Bi2O3 were prepared by solid state reaction. In order to increase breakdown voltage (Vb) and nonlinearity parameter (α), this study intends to dope Na2O-B2O3 into traditional varistors at different sintering temperatures. The effect of the calcination, additive and sintering temperature on the microstructures and electrical characteristic of Bi2O3-ZnO varistor were investigated using FE-SEM, XRD and source meter. The experimental results can be summarized as: 1.The addition of ZnO powder incorporated with calcination process possessed better variable resistance properties. 2.Low sintering temperature shows a variable resistance properties better than higher sintering temperature. 3.Variable resistance properties can be obtained for Na2O doped glass better than original one. In conclusion, the Bi2O3-ZnO varistor doped Na2O-B2O3 glass and sintered at 1050˚C displays the best variable resistance properties, i.e., 24.19 (α) and 22.14 V (Vb).
參考文獻
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