Spark plug

Patent metadata

Field	Value
Publication number	US-10965104-B2
Application number	US-201916966093-A
Country	US
Kind code	B2
Filing date	Sep 3, 2019
Priority date	Nov 9, 2018
Publication date	Mar 30, 2021
Grant date	Mar 30, 2021

Abstract

A spark plug capable of avoiding a discharge member bonded to a base material from peeling off easily is provided. The spark plug includes: a first electrode including a base material and a discharge member having at least a portion thereof bonded to the base material with a diffusing layer interposed therebetween; and a second electrode facing the discharge member with a spark gap interposed therebetween. The base material contains 50 mass % or more of Ni, 8 mass % or more and 40 mass % or less of Cr, 0.05 mass % or more and 2 mass % or less of Si, 0.01 mass % or more and 2 mass % or less of Al, 0.01 mass % or more and 2 mass % or less of Mn, 0.01 mass % or more and 0.1 mass % or less of C, and 0.001 mass % or more and 0.04 mass % or less of Fe.

First claim

What is claimed is:

1. A spark plug comprising:
a first electrode including a base material and a discharge member having at least a portion thereof bonded to the base material with a diffusing layer interposed therebetween; and
a second electrode facing the discharge member with a spark gap interposed therebetween,
wherein the base material contains 50 mass % or more of Ni, 8 mass % or more and 40 mass % or less of Cr, 0.05 mass % or more and 2 mass % or less of Si, 0.01 mass % or more and 2 mass % or less of Al, 0.01 mass % or more and 2 mass % or less of Mn, 0.01 mass % or more and 0.1 mass % or less of C, and 0.001 mass % or more and 0.04 mass % or less of Fe.

2. The spark plug according to claim 1 ,
wherein the base material contains 22 mass % or more and 28 mass % or less of Cr, 0.7 mass % or more and 1.3 mass % or less of Si, 0.6 mass % or more and 1.2 mass % or less of Al, 0.1 mass % or more and 1.1 mass % or less of Mn, and 0.01 mass % or more and 0.07 mass % or less of C.

3. The spark plug according to claim 1 ,
wherein, when X (mass %) represents a content ratio of the Si of the base material and Y (mass %) represents a content ratio of the Fe of the base material, 2.5≤X/Y is satisfied.

4. The spark plug according to claim 3 ,
wherein, when X (mass %) represents the content ratio of the Si of the base material and Y (mass %) represents the content ratio of the Fe of the base material, 2.5≤X/Y≤400 is satisfied.

5. The spark plug according to claim 1 ,
wherein the base material includes a solid solution containing Ni, the solid solution including a segregate present therein, and
wherein, in a cross-section of the base material, an area of the segregate occupying an area of the base material is 0.01% or more and 4% or less.

Assignees

• Ngk Spark Plug Co

Inventors

• Sumoyama Daisuke
• Ito Kazuki

Classifications

• H01T13/20 Primary

  characterised by features of the electrodes or insulation · CPC title

• C22C19/058

  without Mo and W · CPC title

• H01T13/39 Primary

  Selection of materials for electrodes · CPC title

• H01T21/02

  of sparking plugs · CPC title