Title:
SPARK PLUG
Document Type and Number:
Japanese Patent JP2018120734
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a spark plug which enables the enhancement in the wear resistance of an intermediate material and a fusing part.SOLUTION: A spark plug comprises: an intermediate material consisting of an alloy chiefly including Ni, and welded to an electrode base material in the state of protruding from the electrode base material; a chip made of an alloy chiefly including Pt; and a fusion part produced by fusing the intermediate material and the chip together. The chip includes: 6 mass% or more of Rh; at least one kind selected from an R group consisting of Rh, Re, Ir, Ru, W, Mo and Nb; 5 mass% or more of Ni; and at least one kind selected from an N group consisting of Ni, Co, Fe and Cu. In the chip, Rh is included most as to the R group, and Ni is included most as to the N group. The total content of Pt, Rh and Ni is 91 mass% or more; the total content of Pt, the R group and the N group is 95 mass% or more; and the quotient determined by dividing a content of the R group by a content of the N group is 0.7 or more and 8 or less.SELECTED DRAWING: Figure 2
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Inventors:
SUMOYAMA DAISUKE
ATOZAWA TATSUYA
SHIBATA TSUTOMU
ATOZAWA TATSUYA
SHIBATA TSUTOMU
Application Number:
JP2017011022A
Publication Date:
August 02, 2018
Filing Date:
January 25, 2017
Export Citation:
Assignee:
NGK SPARK PLUG CO
International Classes:
H01T13/39; C22C5/04; C22C19/03; C22C19/05; C22C30/00
Attorney, Agent or Firm:
Patent Service Corporation Shinmei Century