| 摘要 |
PROBLEM TO BE SOLVED: To provide a wiring board having a conductor with an excellent high-temperature and anti-oxidation performance.SOLUTION: A wiring board comprises: an insulation substrate 1 made of a ceramic sintered compact; a conductor layer 2 made of an alloy material mainly composed of tungsten, chromium and molybdenum, and provided on the insulation substrate 1; a protection layer 4 made of platinum or a metallic material mainly composed of platinum, and interposed between an outer peripheral portion of the conductor layer 2 and the insulation substrate 1; and an interposed layer 3 mainly composed of at least one of tungsten and molybdenum, and interposed between the conductor layer 2 and the insulation substrate 1 on an inner side than the protection layer 4 in a plane view. A chromium component of the conductor layer 2 is restrained from being dispersed to the insulation substrate 1 by the interposed layer 3, and the interposed layer 3 is restrained from being oxidized by the conductor layer 2 and the protection layer 4, so as to provide a wiring board with an excellent high-temperature and anti-oxidation property. |
