SEPARATOR EXCELLENT IN HEAT RESISTANCE FOR SOLID OXIDE TYPE FUEL CELL AND FUEL CELL USING THE SAME

• Main Authors: HATANO MASAHARU, UENI HIROYUKI, IKEGAMI OSAMU
• Format: Patent
• Language: English; Japanese
• Published: 23.08.2018
• Subjects: ALLOYS; BASIC ELECTRIC ELEMENTS; CHEMISTRY; ELECTRICITY; FERROUS OR NON-FERROUS ALLOYS; METALLURGY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; TREATMENT OF ALLOYS OR NON-FERROUS METALS

PROBLEM TO BE SOLVED: To provide a separator for a solid oxide type fuel cell which maintains excellent oxidation resistance and electrical conduction property under a long period high temperature oxidation environment without involving increase in material cost and impairment of versatility, and in which surface damage caused by heat stress is suppressed, and a fuel cell using the separator for a solid oxide type fuel cell.SOLUTION: Structure having an austenite phase composed of an austenite grain having an average particle size of 1-10 μm is formed on at least one surface of a ferritic stainless steel containing, by mass%, C: 0.030% or less, Si: 1.0% or less, Mn: 1.0% or less, P: 0.045% or less, S: 0.0050% or less Cr: 19.0-25.0%, Mo: 0.2-2.0% or less, N: 0.040% or less, Al: 0.50% or less, Nb: 0.001-0.5% and/or Ti: 0.001-0.5%, and the balance Fe with inevitable impurities. The Co concentration of the austenite phase may be 10-95 mass%, and the balance Ni, Fe, Cr with inevitable impurities.SELECTED DRAWING: Figure 3 【課題】材料コスト上昇や汎用性を損なわずに、長期高温酸化環境下で、優れた耐酸化性と電気伝導性を持続して、熱応力に伴う表面損傷を抑止した固体酸化物形燃料電池用セパレータとこれを用いた燃料電池を提供する。【解決手段】質量％にて、Ｃ：０．０３０％以下、Ｓｉ：１．０％以下、Ｍｎ：１．０％以下、Ｐ：０．０４５％以下、Ｓ：０．００５０％以下、Ｃｒ：１９．０〜２５．０％、Ｍｏ：０．２〜２．０％以下、Ｎ：０．０４０％以下、Ａｌ：０．５０％以下、Ｎｂ：０．００１〜０．５％及び／又はＴｉ：０．００１〜０．５％を含有し、残部がＦｅと不可避的不純物からなるフェライト系ステンレス鋼基材の少なくとも一方の表面上に、平均粒径１〜１０μｍのオーステナイト粒からなるオーステナイト相を有する組織が形成されている。オーステナイト相のＣｏ濃度は１０〜９５質量％、残部がＮｉ、Ｆｅ、Ｃｒと不可避的不純物とすると良い。【選択図】図３