HEAT-RESISTANT ALLOY FOR SOLID OXIDE FUEL CELL

• Main Author: FUJIYOSHI MASARU
• Format: Patent
• Language: English; Japanese
• Published: 06.11.2014
• 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 novel heat-resistant alloy for solid oxide fuel cells which is a Cr-free steel for solid oxide fuel cells and has excellent hot workability and excellent oxidation resistance equal to or higher than that of stainless steel.SOLUTION: A steel for solid oxide fuel cells comprises 2.0-10.0 mass% Al, 6.0 mass% or less Nb and remaining Fe and impurities. The addition of a minute amount of Nb improves oxidation resistance and hot workability, and the lower limit of Nb is preferably 0.02 mass%. The content of Al, which improves oxidation resistance, is preferably 5.0-10.0 mass%. 【課題】 Ｃｒを無添加とする固体酸化物形燃料電池用鋼において、優れた熱間加工性を有し、更に、ステンレス鋼と同等以上の優れた耐酸化性を有する新規な固体酸化物形燃料電池用耐熱合金を提供する。【解決手段】 質量％でＡｌ：２．０〜１０．０％、Ｎｂ：６．０％以下、残部Ｆｅ及び不純物からなる固体酸化物形燃料電池用鋼である。微量添加により、耐酸化性を向上させ、熱間加工性を改善するＮｂの下限は０．０２％であることが好ましく、また、耐酸化性を向上させる前記Ａｌ含有量は５．０〜１０．０％であることが好ましい。【選択図】なし