| 摘要 |
PROBLEM TO BE SOLVED: To provide a spark plug equipped with a noble metal chip having excellent spark depletion resistance, improved in oxidation of its ground electrode, and excelling in high-temperature strength. SOLUTION: A Ni-based alloy constituting a ground electrode 40 for jointing a chip 43 made of a noble metal thereto contains not smaller than 68 mass% of Ni, and further contains 15-23 mass% of Cr, 0.8-3.5 mass% of Mo, 0.01-0.05 mass% of C, not greater than 3 mass% of Fe and 0.003-0.01 mass% of B. COPYRIGHT: (C)2007,JPO&INPIT
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