以銀－銅－鈦活性填料接合固態氧化物燃料電池不鏽鋼雙極板與釔安定化氧化鋯陶金陽極之界面反應與時效之研究

Study on Interfacial Reactions and Aging Behavior between the Stainless Steel Interconnector of the Solid Oxide Fuel Cell and Ni-Yttria Stabilized Zirconia Cermet Anode by using the Ag-Cu-Ti Active Filler

蘇建瑋(J. W. Su) ； 顏怡文(Y. W. Yen) ； 廖大維(D. W. Liaw) ； 柴世融(S. J. Chai)

《鑛冶：中國鑛冶工程學會會刊》 55卷4期 (2011/12) Pp. 63-68

https://doi.org/10.30069/MM.201112.0009

摘要

本研究採真空硬銲方式進行探討以商用銀－銅－鈦活性填料接合雙極板－不銹鋼430SS與陽極8YSZ之行為。在430SS／活性填料／8YSZ的液／固反應中，主要生成相為TiO與Cu-Ti-O化合物，隨著溫度與持溫時間的增加，Cu-Ti-O化合物會逐漸溶回去填料基地內。在靠近不鏽鋼端的生成物為Cu-Ti化合物。隨著反應溫度與時間的增加，Ti原子會不斷的往界面擴散，填料基地組織最後只剩下富Cu區、富Ag區與Cu-Ag共晶。將真空硬銲的結果進行700與750℃時效反應，反應時間為24小時。實驗結果顯示在長時間的高溫時效後，在靠近8YSZ端的界面，TiO相會轉為穩定的TiO2相，而Cu與Ag原子亦會擴散穿越過氧化鈦層。Cu原子隨即與存在於界面的O原子反應生成CuO與Cu2O。Ag原子仍然與富Ag區存在於界面。同樣的，O原子亦會擴散進入填料基地與原先的富Cu區反應生成CuO。隨著反應溫度與時間的增加，TiO2反應層會逐漸溶回基地形成鬆散結構。

關鍵字

真空硬銲 ； 銀-銅-鈦活性填料 ； 不銹鋼430SS ； 8YSZ ； 液／固反應

並列摘要

Used as the sealing filler. The 8YSZ/Cusil ABA/ 430SS sandwich couples are bonded by a vacuum brazing method. We investigated the interfacial reactions and aging behavior of the sandwich couples. A eutectic structure of Ag and Cu, TiO, Cu3Ti3O and Cu2Ti4O phases were observed in the 8YSZ/ Cusil ABA/ 430SS sandwich couples reacted at 833℃ for 60 min. When these specimens were set at 700℃ in the atmosphere for 24 h, Ag-rich phase and CuO dendrite phases between the 8YSZ and 430SS, and CuO, Cu2O and TiO2 layers close to 8YSZ were observed. Increasing the brazing temperature to 883℃, the Cu3Ti3O and the Cu2Ti4O phases were dissolved back to the molten braze alloy. There are two intermetallic compounds, the TiO and the Cu-Ti phases formed at the interfaces along the 8YSZ and 430SS boundaries. When the 8YSZ/Cusil ABA/430SS couples were brazed at 883℃ for 60 min and then aged at 750℃ for 24 h, the TiO2/CuO/Ag-rich/CuO/ TiO2 structures were observed between 8YSZ and 430SS.

並列關鍵字

solid oxide fuel cell (SOFC) ； 8 mol% yttria doped zirconia (8YSZ) ； Ag-Cu-Ti active alloy (Cusil ABA) ； stainless steel 430 (430SS) ； vacuum brazing