| 摘要 |
PROBLEM TO BE SOLVED: To provide a spark plug with a long life and excellent durability even under an environment of high temperature. SOLUTION: The spark plug 100 comprises a cylindrical main body metal fitting 1, a cylindrical insulation body 2 arranged at an inner hole of the main body metal fitting 1, a center electrode 3 arranged at the tip side of the inner hole of the insulation body 2, and a ground electrode 4 of which one end is fixed to the main body metal fitting 1 and the other end forms a spark discharge gap between the center electrode 3 and itself. At least either the center electrode 3 or the ground electrode 4 is made from an electrode material containing Cr by 13 to 19 wt.%, Fe by 6 to 10 wt.%, at least one or more kind of elements selected from Ni, Re, Rh, and Ta by a total content of not less than 0.5 wt.% and not more than 2.5 wt.%, and residual Ni containing B by 0.001 to 0.01 wt.%. COPYRIGHT: (C)2004,JPO&NCIPI
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