Spark plug

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United States of America Patent

PATENT NO 9948068
SERIAL NO

15036572

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Abstract

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A spark plug that includes a center electrode and a ground electrode. The center electrode is disposed providing a gap with the center electrode. At least one of the center electrode and the ground electrode includes a tip forming the gap. The tip includes a main body portion and a front surface layer. A composition of the main body portion is Pt as a main constituent and Rh of 5 mass % or more and Ni of 0 mass % or more to less than 8 mass %. The front surface layer is disposed at least at a surface radially outside of an axial line extending in a direction from a center of the main body portion to the gap. The front surface layer contains Ni of 8 mass % or more and has a thickness of 2 μm or more.

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Patent Owner(s)

Patent OwnerAddress
NITERRA CO LTD1-1-1 HIGASHISAKURA HIGASHI-KU NAGOYA-SHI AICHI 4610005 ?4610005

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Shibata, Tsutomu Owariasahi, JP 62 687
Sumoyama, Daisuke Nagoya, JP 22 78

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