Patent ID: 7531053
Filing Date: 2009-05-12
Classification: C21D,C22C

Abstract:
1. A solid-oxide fuel cell using a metallic material the fuel cells comprising: 0.006 percent by mass or less of C; 0.02 to 0.13 percent by mass of Si; 2.0 percent by mass or less of Mn; 19.65 to 20.45 percent by mass of Cr; 0.11 to 5.0 percent by mss of Mo; 0.21 to 3.0 percent by mass of Nb; at least one element selected from the group consisting of Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Zr, and Hf in a total of 0.03 to 1.0 percent by mass; and the balance composed of Fe and inevitable impurities; wherein 0.3≦Mo/Nb≦9.57 is satisfied, and further comprising a precipitate containing Fe, Cr and Si at contents on the basis of the metallic material satisfying the following equation (1): wherein, [precipitated Fe]: content (percent by mass) of Fe in the precipitate; [precipitated Cr]: content (percent by mass) of Cr in the precipitate; and [precipitated Si]: content (percent by mass) of Si in the precipitate, and the metallic material; wherein, when in use at a cell operating temperature of 800° C. for at least 1,000 hours or more, the Fe, Cr and Si contents in the precipitate on the basis of the metallic material satisfy the following equation (2): wherein, [precipitated Fe]: content (percent by mass) of Fe in the precipitate; [precipitated Cr]: content (percent by mass) of Cr in the precipitate; and [precipitated Si]: content (percent by mass) of Si in the precipitate.