固態氧化物燃料電池之YSZ電解質高溫燒結製作程序的最佳化控制

Optimal control of the sintering process for YSZ electrolytes of solid oxide fuel cells

吳榮康(Jung-Kang Wu)

指導教授 ： 廖朝光

元智大學/工程學院/化學工程與材料科學學系/碩士(2008年)

https://doi.org/10.6838/YZU.2008.00299

摘要

本研究探討以最佳化方法控制Yttria Stabilised Zirconia(YSZ)電解質於高溫燒結下收縮現象的最佳加熱操作途徑。利用熱傳導理論建構電解質胚體三維空間中熱傳輸送模型，以數值分析計算胚體內部溫度分佈，利用Thermal Mechanical Analyzer(TMA)熱機械分析儀得到胚體收縮率分佈與溫度關係。結果顯示YSZ胚體粒子受加熱條件的影響甚鉅，胚體內部溫度分佈隨不同的加熱速率及不同尺寸的胚體而變化，進而影響胚體收縮速率和收縮率差值。藉由模擬出來的胚體收縮速率和收縮率差值，以最佳化控制在不使電解質胚體產生缺陷下，得到最適化的操作，在最短時間成功的完成YSZ陶瓷胚體於高溫燒結的程序。

關鍵字

生胚、數值模擬、收縮、熱機械分析

並列摘要

The optimal heating trajectories to minimize the time required for control the shrinkage in yttria-stabilized zirconia (YSZ) green tapes were determined using an off-line dynamic optimization method. The temperature distribution of the sample tapes can be estimated by a numerical simulation method with the thermal transport model; the shrinkage distribution of the tape caused by the increase of the heating temperature was measured by a thermal mechanical analyzer (TMA) during the thermal processing. Results show the evolution of YSZ tape crystal growth was greatly influenced by the heating conditions. The temperature distribution of different YSZ sample size can affect the shrinkage rate and shrinkage difference inside the tapes during the heating process. The optimal heating trajectories under the control of the shrinkage rate and shrinkage difference were determined for the sintering process. The optimization at high temperature sintering can be applied to control of the ceramic manufacturing process.

並列關鍵字

green tapes, Numerical simulation, shrinkage, Thermal mechanical analysis

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