固体氧化物燃料电池玻璃陶瓷复合密封材料的分析-材料学专业论文.docxVIP

华 中 科 技 大 学 硕 士 学 位 论 文 Abstract Intermediate temperature planer Solid Oxide Fuel Cell (IT-SOFC) quickly catches the researchers’ eyes around the world due to its high power density and easy fabrication. However, one of the biggest challenges for the development of IT-SOFC is the sealing problem. In this paper, new Al2O3 based seals and glass based seals were fabricated based on the advantages of Al2O3-Al composite seals and glass seals prepared in earlier research and were tested and analyzed thereafter. For Al2O3 based composite seals, the changes of leakage rates were not various when a small amount of glass powder was added into the seals, but significant changes were observed when doped more glass powder, which was because that the melted and softened glass would block the pores to prevent gas leakage at high temperature. However, with the increase of thermal cycles and the added glass powder, the crystallization would aggravate and then the seals would crack quickly. The leakage rates of the glass based seals which were added 30% Al2O3 (named as HGS1) were extremely low and even after 25 thermal cycles the leakage rates were still below 0.01 sccm.cm-1 within the SECA standard. The new phases and closed pores caused by the reaction of glass and Al2O3 had produced no various influences on the leakage rates. Good compatibility between seals and the adjacent components provided well interface contact and when the seal was applied for single cell testing, undetectable degradation of the voltage clearly demonstrated the applicable performance of HGS1 seal in solid oxide fuel cell. Compared with these two seals, the overall performance of HGS1 seals were better than Al2O3 based composite seals indicating large commercial potential. Keywords: Solid Oxide Fuel Cell; seals; Al2O3; glass; leakage rate; thermal cycle II 华 华 中 科 技 大 学 硕 士 学 位 论 文 PAGE PAGE IV 目 录 摘 要 I HYPERLINK \l _bookmark0 Abstract II HYPERLINK \l _bookmark1 1 绪 论 HYPERLINK