Abstract: A nickel-chromium porous body includes a skeleton having a three-dimensional mesh-like structure. The skeleton has a hollow inner portion and has a main metal layer and a surface oxide layer formed on each surface side of the main metal layer. The surface oxide layer has a thickness of 0.5 ?m or more and contains chromium oxide as a main component. The main metal layer is formed of nickel-chromium having a chromium content of 10 mass % or more as a whole and has a chromium content of 20 mass % or more in a region extending at least 3 ?m from an interface in contact with the surface oxide layer. The surface oxide layer and the main metal layer are in close contact with each other without a gap therebetween.

Abstract: A metal porous body includes a three-dimensional mesh-like skeleton. The metal porous body has a bottom surface having a polygonal shape and has a curved shape from the bottom surface toward an apex. The bottom surface has a side having a length of 2 mm to 10 mm, and a height from the bottom surface to the apex is 1 mm to 5 mm.

Abstract: A metal porous material according to an aspect of the present disclosure is a metal porous material in sheet form that includes a frame having a three-dimensional network configuration, wherein the frame includes an alloy including at least nickel (Ni) and chromium (Cr), the frame 11 is a solid solution with iron (Fe), the frame includes a chromium oxide (Cr2O3) layer as an outermost layer and includes a chromium carbide layer located under the chromium oxide layer, the chromium oxide layer has a thickness not less than 0.1 ?m and not more than 3 ?m, and the chromium carbide layer has a thickness not less than 0.1 ?m and not more than 1 ?m.

Abstract: A porous metal body having a flat plate shape and having a three-dimensional network structure skeleton includes multiple cells, in which, when a ratio of a cell diameter in a thickness direction of the porous metal body to a cell diameter in a direction orthogonal to the thickness direction (cell diameter in thickness direction/cell diameter in direction orthogonal to thickness direction) is defined as a cell diameter ratio, formula (1) and formula (2) below are satisfied: 0.4?cell diameter ratio?1.0??formula (1) 0.50<cell diameter in direction orthogonal to thickness direction/(thickness of porous metal body/cell diameter ratio)?1.

Abstract: A fuel cell according to the present disclosure includes a flat plate-shaped metal porous body having a framework of a three-dimensional network structure as a gas diffusion layer. The framework is made of metal or alloy. In the metal porous body, a ratio of an average pore diameter in a direction parallel to a gas flow direction to an average pore diameter in a direction perpendicular to the gas flow direction is greater than or equal to 1.4 and less than or equal to 2.5.

Abstract: A metal porous material according to an aspect of the present disclosure is a metal porous material in sheet form that includes a frame having a three-dimensional network configuration, wherein the frame includes an alloy including at least nickel (Ni) and chromium (Cr), the frame 11 is a solid solution with iron (Fe), the frame includes a chromium oxide (Cr2O3) layer as an outermost layer and includes a chromium carbide layer located under the chromium oxide layer, the chromium oxide layer has a thickness not less than 0.1 ?m and not more than 3 ?m, and the chromium carbide layer has a thickness not less than 0.1 ?m and not more than 1 ?m.

Abstract: A fuel cell according to the present disclosure includes a flat plate-shaped metal porous body having a framework of a three-dimensional network structure as a gas diffusion layer. The framework is made of metal or alloy. In the metal porous body, a ratio of an average pore diameter in a direction parallel to a gas flow direction to an average pore diameter in a direction perpendicular to the gas flow direction is greater than or equal to 1.4 and less than or equal to 2.5.

Abstract: A metal porous body including a frame of a three-dimensional network structure, wherein the metal porous body has an outer appearance of a sheet shape, the frame is an alloy containing at least nickel and chromium, and is dissolved with iron in solid state, and the number of aluminum oxide powder adhered to the surface of the frame is 10 or less in 1 cm2 of the apparent area of the metal porous body.