以田口方法探討NiO-GDC陽極材料水系刮刀成形之前燒結陶瓷板性質

Tape Casting of NiO-GDC for Anode of SOFC in Aqueous Media with Taguchi Method

羅旭峰(Hsu-Feng Lo) ； 余炳盛(Bing-Sheng Yu) ； 江姿萱(Tzu-Hsuan Chiang) ； 王玉瑞(Yuh-Ruey Wang)

《臺灣鑛業》 65卷1期 (2013/03) Pp. 45-57

摘要

氧化鎳/氧化鈰基陶瓷體為固態氧化物燃料電池中相當受到注目的陽極基板材料，其性質和製程條件相關密切。對於刮刀成形此類的膠體成形技術而言，起始漿料的製備是一項關鍵技術。從起始漿料之分散性、流變性到成形後生胚之密度、燒結行為，其中涉及到大量影響因子。故本研究引入田口方法，以實驗設計的手段統合討論各項參數之行為及權重。探討之參數包括固含量、分散劑含量、黏結劑含量、塑化劑含量之變動對其流變性及生胚密度。計算其最佳漿料配方，並研究該配方生胚基板之燒結行為。本研究以田口法L18(2^1x3^7) 直交表規劃出的18組實驗，經由先期實驗調整參數後，皆能順利進行刮刀成形。生胚收縮率最低可達6.125%、生胚密度最高可達2.434 g/cm^3，顯示出其NiO-GDC陶瓷漿料相當均質，因此薄帶生胚中陶瓷顆粒堆疊良好且密集，有利於燒結後陶瓷板之性質。前燒結陶瓷板之孔隙率約在50~60%之間，有助於與電解質及陰極共燒後仍保持足夠之孔隙以導通燃料氣體，提高單電池之效能。

關鍵字

水系刮刀成形 ； NiO-GDC ； 固態氧化物燃料電池 ； 田口法

並列摘要

NiO-GDC as ceramic substrate is a promising material for used as SOFC anode. Its properties is closely related to its manufacturing process. For colloidal forming technologies, one key technique lies in the preparation of initial paste whose dispersivity, rheological properties, density of the green ceramic formed, and sintering behavior all involve a great number of impact factors. By applying the concepts of Taguchi method, the study designs and performs experiments to examine various parameters with the purpose of helping expand the width of related research. Parameters examined include solid content and changes in the contents of dispersant, binder, and plasticizer for analyzing the rheological properties and green ceramic density of the initial paste and developing an optimal formula of paste preparation. The sintering behavior of the green ceramic substrate prepared by the optimal formula is then discussed. The study conducted 18 sets of experiments as planned by the Taguchi L18 (2^1x3^7) orthogonal array. With parameters adjusted, preliminary experiments were capable of performing tape casting. Minimum shrinkage rate and maximum density of the green ceramic read 6.125% and 2.434g/cm^3 respectively, indicating the fine homogeneity of the NiO-GDC ceramic paste. The ceramic green film is therefore marked with well-stacked and dense particles beneficial to the properties of sintered ceramic substrate. The porosity ratio of the ceramic substrate fell in the range of 50~60% before sintering, which is helpful in maintaining adequate porosity for conducing fuel gas and enhance the performance of the single cell.

並列關鍵字

Aqueous tape casting ； NiO-GDC ； SOFC ； Taguchi method