| 摘要 |
PROBLEM TO BE SOLVED: To provide a multi-layer material having a porous surface layer excellent in adhesion to a lower layer, and to provide a production method thereof.SOLUTION: A multi-layer material has a conductive substrate layer (18), a porous surface layer (28a), and a middle layer (28b) which is arranged in the sandwiched state between the substrate layer and the surface layer, and in which a component in the substrate layer is transitionally reduced from the substrate layer toward the substrate layer.SELECTED DRAWING: Figure 1 |
