第四章 結果與討論
四 電阻測試
表11 本實驗各種合金與電阻的關係
Composition 750℃ 800℃ Composition 750℃ 800℃
Fe-16Cr 3.9323 2.678 Fe-12Cr 7.0602 3.103 Fe-16Cr-0.5Mn 2.5302 1.3268 Fe-12Cr-0.5Mn 4.8139 3.3014 Fe-16Cr-1Mn 2.159 1.2101 Fe-12Cr-1Mn 3.7476 2.582 Fe-16Cr-0.5Ni 6.349 4.4503 Fe-12Cr-0.5Ni 6.2629 5.265 Fe-16Cr-1Ni 7.1209 5.12 Fe-12Cr-1Ni 7.972 7.125 單位 mohm-cm2 S.J.Geng et al.[30]所言，氧化鎳會有生成不均的問題，這可能形成表面雖有部分 的氧化鎳，但其餘部分卻還是高電阻的氧化鉻，在這情形下鉻會向外揮發，並在 氧化鎳外層在形成一層氧化鉻，以降低了電阻。
此外，根據Ellingham Diagram，如圖 59，在 800℃時 NiO 的 Standard Gibbs Free Energy 為約-340KJ/mol 比鉻和錳形成氧化物不易，故比錳慢生成氧化物，不利 於形成保護鉻的保護膜，使得氧化鉻生成增加，電阻下降。
然而一般商用合金在高溫的電阻，如Crofer22，在 800℃時，低至 1
mohm-cm2，可見就算是本實驗中電阻最低的Fe-16Cr-1Mn 都尚未能達到這樣的 要求。在一般的商用合金中，常會添加一些有利於電導的元素，例如鈮或者是鑭
等元素，若欲改善此合金性質可能需嘗試以Fe-16Cr-1Mn 合金添加有利於電導的 元素，以利更進一步的研究。
五 結論
(四)在本實驗的十種合金中，Fe-12Cr-1Mn，具有與 Fe-16Cr-Mn 系列相比較接近 的電阻，而熱膨脹係數也較Fe-16Cr-Mn 系列適合 YSZ，為本實驗最適合做為 SOFC 連接器的材料。
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