固態氧化物燃料電池之釔安定化氧化鋯(YSZ,Yttria Stabilised Zirconia)電解質陶瓷胚體之有機物最適化燒除程序,經由離線動態最適化控制方法達成。以不同配方製作出漿料,經刮刀塗佈的方式將YSZ薄膜塗佈於基材上,觀察煆燒前和煆燒後的表面性質,以決定較佳電解質配方,利用熱重分析儀(TGA)分析有機添加物的熱解移除動力,再藉由TMA量測分析與數值計算,可估算YSZ薄膜於燒結過程中內部中心產生的壓力,最後利用最佳化程式,控制燒結過程,達到最佳化目的。結果顯示,不同有機物配方組成,對於煆燒後的生胚會有不同的影響,此外,不同加熱速率和不同幾何形狀的胚體,也都會影響燒結過程中內部中心點產生的壓力值, 由TMA實驗和模擬數據比對壓力產生的溫度點,結果相近。以較佳電解質配方製作出來的YSZ電解質生胚,經由模擬得知內部壓力產生情形,以期避免缺陷產生並減少製作時間,建立有機物添加劑移除的最佳化操作程序。
The optimal heating trajectories to minimize the time required for the organic additives removal in yttria-stabilized zirconia (YSZ) green tapes were determined using an off-line dynamic optimization method.YSZ electrolyte tapes were produced by a tape casting approach. The effects of the recipes on the surface morphology of the tape samples before and after sintering were analyzed by microscopy and SEM. A better recipe was determined from the analytical results. The pressure buildup of the sample tapes formed by the volatile gas can be estimated by a numerical simulation method; meanwhile, the deformation (strain) of the tape caused by the pressure buildup was measured by a thermal mechanical analyzer (TMA) during the thermal processing. Results show that formations of the sample defects were greatly influenced by the recipe.The formation of the maximum pressure buildup at tPhe center of the cubic tape is influenced by the sample size and heating conditions. In addition, the dynamic strain at the center of the sample measured by TMA agrees with the formation of the pressure buildup estimated by the numerical calculation.Eventually optimal control of thermal processing of YSZ electrolyte can be achieved.