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Patent Searching and Data


Title:
IGNITION PLUG
Document Type and Number:
WIPO Patent Application WO/2018/100831
Kind Code:
A1
Abstract:
The strength, the oxidation resistance, and the spark wear resistance of an electrode of this ignition plug are improved. A center electrode and/or a ground electrode of the ignition plug is formed using a nickel (Ni) alloy containing 50% or more by weight of Ni. The Ni alloy contains 1% or more by mass, in total, of one or more elements selected from the group consisting of Al, Cr, Si, and Mn, and contains Ag. In a cross section obtained by cutting, near a gap, a Ni-alloy made portion of the electrode in a direction perpendicular to the longitudinal direction of the electrode: the percentage of an area occupied by a precipitate containing Ag is at least 0.1% with respect to the area of a 80 µm × 80 µm measurement region having a start point at 100 µm and an end point at 180 µm in the depth direction from a surface of the electrode; and the average grain diameter of the Ni alloy is 250 µm or less.

Inventors:
ITO KAZUKI (JP)
SHIBATA TSUTOMU (JP)
SUMOYAMA DAISUKE (JP)
FUJINO KENSUKE (JP)
Application Number:
PCT/JP2017/032600
Publication Date:
June 07, 2018
Filing Date:
September 11, 2017
Export Citation:
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Assignee:
NGK SPARK PLUG CO (JP)
International Classes:
H01T13/39
Foreign References:
JPH03111534A1991-05-13
JPH09291327A1997-11-11
Attorney, Agent or Firm:
AOKI Noboru et al. (JP)
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