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| 題 名 | 預鍍銀層於2205-LSM高溫電性之作用=Effect of Ag-Precoating on the Electrical Conductivity of 2205-LSM at High Temperature |
|---|---|
| 作 者 | 王朝正; 陳姿伶; | 書刊名 | 技術學刊 |
| 卷 期 | 24:2 2009.06[民98.06] |
| 頁 次 | 頁107-115 |
| 分類號 | 472.16 |
| 關鍵詞 | 2205雙相不銹鋼; 高溫氧化; 面積比電阻; 金屬雙極板; 固態氧化物燃料電池; 2205 duplex stainless steel; High-temperature oxidation; Area specific resistance; Metallic interconnects; Solid oxide fuel cell; |
| 語 文 | 中文(Chinese) |
| 中文摘要 | 本研究以2205 雙相不銹鋼 (2205DSS) 為底材,並披覆La0.7Sr0.3MnO3 (2205-LSM),以及在披覆La0.7Sr0.3MnO3 之前,於底材表面預先分別濺鍍2、4、5 µm 的Ag 層、網印Ag 層,再經1100 °C 氮氣氣氛高溫燒結後,探討2205-LSM 於800 °C 的高溫氧化行為及Ag 於高溫電性的作用。實驗結果顯示,2205-LSM 於800 °C 氧化1000 小時後,合金底材與LSM 界面形成的氧化物厚度相較於未氧化的2205-LSM 之氧化層增長1.56 ± 0.05 µm 。但在500 ~ 750 °C 的ASR (area specific resistance),卻僅增加0.16 ~ 0.003 Ωcm2,其原因是Cr-Mn spinel 比例提高或二價金屬離子摻雜Cr2O3,提昇了氧化層的導電性。在500 ~ 750 °C 的電性量測,含中間Ag 層的2205-LSM 之ASR 均隨溫度提昇而下降,且其值也均低於2205-LSM 的ASR,其提昇的效果在低溫環境相較於高溫更為顯著。 主要的代表是貴金屬縮短電子的傳導路徑 (current collection),增加電荷轉移效率,另為低價金屬離子摻雜氧化物與LSM 層,提昇整體導電性所致。使用濺鍍方式披覆不同Ag 層厚度的2205-LSM,在500 °C 測得的ASR 均低於 2205-LSM 在750 °C 的ASR,2205DSS/Ag/LSM 用以作為金屬雙極板 (metallic interconnects) 的材料,將可降低固態氧化物燃料電池(Solid Oxide Fuel Cell, SOFC) 操作溫度。 |
| 英文摘要 | This research focuses on the behavior and characteristics of oxidation for 2205-LSM at 800 °C and its influence on electrical performance at high temperature for a silver layer. LSM, Ag-LSM coated on 2205DSS by screen print and sputter were sintered at 1100 °C in a nitrogen atmosphere for 30 to 90 minutes. Treated specimens were then oxidised at 800 °C. After oxidation at 800 °C for 1000 hours, an oxide layer was formed at the interface between LSM and 2205DSS. An increase in thickness of oxide layer was observed about 1.56 ± 0.05 µm but there were only small differences in resistance measurements about 0.16 to 0.003 Ωcm2 as com-pared with non-oxidised specimens. During long-term oxidation, formation of Cr-Mn spinel derived from the reaction of Cr2O3 from 2205DSS and LSM was increased. Formation of Cr-Mn spinel would reduce resistance due to its better conductivity. Regarding resistance measurements at tem- peratures of 500 to 750 °C, ASR (area specific resistance) for noble metal-LSM coated 2205DSS was decreased with increase of temperature. ASR of the specimens was less than for LSM coated 2205DSS, especially at lower temperatures because the noble metal acted as a current collector to provide a better pathway for conduction of electrons, and low valence cations were diffused to the LSM and oxide layers. Different thicknesses of Silver were coated on 2205-LSM by sputtering. According to our results, ASR for Ag-LSM coated 2205DSS at 500 °C was less than for LSM coated 2205 DSS at 750 °C. This demonstrated that metallic interconnects prepared with Ag-LSM coated 2205DSS could lower working temperatures for SOFC. |
本系統中英文摘要資訊取自各篇刊載內容。