開發先進金屬合金應用於SOFC連接板

Development of advanced metallic alloys for SOFC interconnect application

許哲銘(Hsu, Che Ming)

指導教授 ： 葉安洲 ； 張士欽

國立清華大學/工學院/材料科學工程學系/碩士(2015年)

https://doi.org/10.6843/NTHU.2015.00205

摘要

本研究係使用Thermo-Calc及CALPHAD-base JMatPro兩款熱力學模擬軟體，並搭配真空電弧熔煉（VAM）開發出三組具應用於固態氧化物燃料電池（SOFCs）金屬連結板（metallic interconnect）潛力之合金材料：鎳基CMH-1、鎳鐵基CMH-2、與鐵基CMH-3。三組特殊設計之合金將參考固態氧化物燃料電池連結板實際運作之條件進行綜合性評估，探討實際應用之可能性。實驗內容包含800 °C下之熱差分析（DTA）、高溫相穩定測試、抗氧化能力試驗、面積比電阻量測（ASR）、熱膨脹行為探討（CTE）、高溫硬度潛變分析、及鉻揮發趨勢。同時，兩款商用連結板鐵基材料：Crofer 22H與ZMG232 G10，將作為本研究之參考組。
綜合結果顯示，CMH-1及CMH-2具相對優秀之高溫機性性質、低面積比電阻、低鉻揮發趨勢，CMH-3則具良好之低熱膨脹行為、高抗氧化能力。三組特殊設計之合金材料皆表現出適合應用於固態氧化物燃料電池金屬連結板之性質。

關鍵字

固態氧化物燃料電池 ； 連接板 ； 合金設計 ； 金屬材料

並列摘要

Three advanced high temperature alloys, a Ni-based (CMH-1), a Ni-Fe based (CMH-2), and a Fe-based (CMH-3) alloys have been developed with the assistance of Thermo-Calc and CALPHAD-base JMatPro simulation software, and practically fabricated by vacuum arc melting (VAM) to be potentially used as SOFC interconnect materials. These newly designed alloys have been comprehensively evaluated with respect to their differential thermal analysis, phase stability, oxidation resistance, area specific resistance (ASR), coefficient of thermal expansion (CTE), hardness creep test, and degree of Cr evaporation behavior at 800 °C. Experimental results have been compared to those of widely used commercial Fe-based ferrite alloys, Crofer 22H and ZMG232 G10.
Research results illustrate these novel alloys have exhibited well-balanced properties with excellent microstructure stability at 800 °C. Ni-based (CMH-1) and Ni-Fe based (CMH-2) alloys have shown better mechanical strength, lower ASR and lower degree of Cr poisoning at elevated temperature, and Fe-based (CMH-3) alloy has exhibited lower thermal expansion and better oxidation resistance in comparison to Fe-based commercial materials.

並列關鍵字

solid oxide fuel cell ； interconnect ； alloy design ； metallic materials

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