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研究生： 林韋杉
Wei-shan Lin
論文名稱： LSCF塗層於2205DSS高溫氧化及電性之作用
Effect of LSCF Protective Coating on the Oxidation and Electrical Properties of 2205DSS at High Temperature
指導教授： 王朝正
Chaur-jeng Wang
口試委員: 周振嘉
Chen-chia Chou
周賢鎧
Shyan-kay Jou
學位類別： 碩士
Master
系所名稱： 工程學院 - 機械工程系
Department of Mechanical Engineering
論文出版年： 2008
畢業學年度： 96
語文別： 中文
論文頁數： 137
中文關鍵詞： 固態氧化物燃料電池 、金屬雙極板 、高溫氧化 、ASR
外文關鍵詞： 2205 duplex stainless steel, Solid oxide fuel cell, Metallic Interconnects, High-temperature oxidation, Area specific resistance
相關次數： 點閱：222  下載：4 
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    • 本研究使用2205雙相不銹鋼(2205DSS)作為固態氧化物燃料電池(SOFC)的雙極板材料，並以網印方式披覆La0.6Sr0.4Co0.2Fe0.8O3 (LSCF)塗層，以及分別添加30 wt%、20 wt%、10 wt%、5 wt% Ag於LSCF中，再經氮氣氣氛高溫燒結後，探討2205LSCF的高溫氧化與電性行為及Ag於高溫電性的作用。實驗結果顯示，2205LSCF在1000℃氮氣氣氛燒結，LSCF相穩定且塗層與合金底材附著性良好。塗層與合金底材界面間僅生成較低電阻、單層且薄的Cr-Mn spinel氧化物。於800℃高溫氧化，2205LSCF中的2205DSS因有LSCF塗層的保護，可有效阻礙氧離子擴散通過塗層到達合金界面，降低氧化皮膜成長速率。500 ~ 750℃的電性量測結果顯示，2205LSCF的ASR值皆低於披覆La0.7Sr0.3MnO3 (LSM)的2205DSS的ASR值，2205DSS網印LSCF塗層的導電性優於LSM塗層。在長時間的ASR值量測，2205LSCF於750℃長時間的ASR值低於2205LSM於800℃長時間的ASR值。網印方式披覆LSCF塗層於2205DSS，適合作為金屬雙極板的保護材料。添加不同含量Ag的2205(LSCF-Ag)於500 ~ 750℃的ASR值皆大於2205LSCF於500 ~ 750℃的ASR值。因此使用網印方式披覆(LSCF-Ag)塗層，並不適合作為保護金屬雙極板的保護層材料。

    Duplex stainless steel (2205DSS) are being considered as potential interconnect materials for SOFC. The protection layers, LSCF and LSCF-Ag, were chosen, and the electrical properties and oxidation resistance of coating layers on 2205DSS were examined. The LSCF layer was coated on 2205DSS (2205LSCF) by screen printing and was sintered at 1000℃. LSCF was sintered in N2 atmosphere without decomposition, and only a thin oxide layer formed between LSCF and the alloy. The reason was that the LSCF layer suppressed the reaction between oxygen and the alloy, resulting in the slower oxidation rate as compared with 2205DSS. The area specific resistance measurements at the range from 500℃ to 750℃ were conducted, and the result showed that the area specific resistance (ASR) of 2205LSCF was less than that of LSM-coated one, because LSCF has higher electronic conductivity. The results of ASR measurement at 750 as function of holding time implied that the lower ASR of 2205LSCF was due to the formation of Cr-Mn spinel only. The incorporation of Ag in the LSCF layer was found to be an ineffective way for the reduction of ASR over the entire range form 500℃ to 750℃. It is concluded that the LSCF-coated 2205DSS by screen printing is adequate for metallic interconnect.

    摘要 I Abstract II 誌謝 III 目錄 IV 圖目錄 VII 表目錄 XIV 第一章 前言 1 第二章 文獻回顧 4 2.1 固態氧化物燃料電池介紹 4 2.1.1 固態氧化物燃料電池工作原理 4 2.1.2 電解質 5 2.1.3 陽極 7 2.1.4 陰極 9 2.1.5 雙極板 12 2.2 金屬雙極板與其改質方式 14 2.2.1 Cr基合金金屬雙極板 14 2.2.2 Fe基合金金屬雙極板 18 2.2.3 金屬雙極板改質 22 2.3 金屬雙極板的接觸電阻 37 第三章 實驗方法 39 3.1 實驗流程 39 3.2 試片製備 40 3.2.1 金屬雙極板準備及清洗 40 3.2.2 試片的名稱 41 3.3 LSCF膠體的製作和網印 42 3.3.1 LSCF、LSCF + Ag粉末製備 42 3.3.2 LSCF、LSCF + Ag膠體製備 46 3.3.3 LSCF、LSCF + Ag網印及燒結 46 3.4 氧化實驗 48 3.4.1 恆溫氧化實驗 48 3.4.2 熱循環氧化實驗 48 3.5 電阻量測 49 3.5.1 白金電極製備 49 3.5.2 電阻量測與設備 49 3.6 分析方法與設備 52 3.6.1 分析方法 52 3.6.2 分析設備 53 第四章 實驗結果與討論 54 4.1 溫度對2205LSCF燒結之作用 54 4.1.1 1050℃ 54 4.1.2 1000℃ 58 4.2 高溫恆溫氧化 64 4.2.1 氧化動力學 64 4.2.2 2205DSS 66 4.2.3 2205LSCF 76 4.3 高溫循環氧化 87 4.4 電阻量測 96 4.4.1 2205LSCF 96 4.4.2 長時間電阻量測 104 4.5 添加Ag對2205LSCF之作用 108 4.6 LSCF與LSM塗層對2205DSS之作用 121 第五章 結論 124 參考文獻 125 附錄A La0.6Sr0.4Co0.2Fe0.8O3配重計算 134 附錄B JCPDS參考資料 135 作者簡介 137

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