以雙自熔旋轉電極製備多孔支撐材性質之探討

Abstract

傳統固態氧化物燃料電池(SOFC)是以Ni-YSZ複合材料作為陽極支撐，其缺點在於Ni的成本過高，而且以碳氫氣體作為燃料時，會有積碳的現象發生，造成能量轉換效率降低。而Fe-Cr合金或不鏽鋼，製造的陽極支撐材，其成本低，與Ni-YSZ陽極熱膨脹係數的匹配性佳，並有良好的高溫抗氧化性。 本研究的目的在於探討新發展的多孔支撐材之性質，材料以不鏽鋼為主，用旋轉電極製備的雙層金屬粉末，其內層是430不鏽鋼，外層是Cu以改善積碳能力。製備出來的粉末將與商業430不鏽鋼粉混和，並添加PMMA造孔劑，以粉末冶金的方式燒結。燒結後之燒結品作以下性質分析：孔隙率、高溫氧化實驗、高溫電阻實驗、透氣率實驗以及維氏硬度實驗。

Conventional anode support of solid oxide fuel cell (SOFC) was made with Ni-YSZ cermet materials which had drawbacks of high cost and performance reduce due to carbon deposition with hydrocarbon fuel gas. The high chromium contained Fe-Cr alloy are good candidates for anode support due to its low cost and pretty well high temperature oxidation resistance. Besides, the coefficient of thermal expansion of Fe-Cr alloy is close to the solid electrolyte. The aim of this research is to develop copper contained dual layer powders to improve porous substrate. The metal powders were made by rotating electrode process and the powder has a structure of dual layers. The inner layer is ss430 and the outer layer is copper to reduce carbon soot. We mixed the powders with commercial ss430 fine powders and PMMA pore formers. Porous substrates were prepared by die-pressing and sintered in hydrogen. The sintered specimens were then evaluated with high temperature oxidation resistance test, porosity, high temperature ASR test, permeability test and Vickers hardness test.