Electrode material and spark plug

Patent metadata

Field	Value
Publication number	US-9783872-B2
Application number	US-201414758891-A
Country	US
Kind code	B2
Filing date	Jan 8, 2014
Priority date	Jan 8, 2013
Publication date	Oct 10, 2017
Grant date	Oct 10, 2017

Abstract

An electrode material for at least one of a center electrode ( 5 ) and a ground electrode ( 27 ) provided with a chip ( 31, 32 ) for use in a spark plug ( 1 ). The electrode material contains Ni as a principal component, and has a Si content of from 0.50% to 1.0% by mass, an Al content of from 0.2% to 2.0% by mass, a Cr content of from 12% to 34% by mass, a rare-earth element or the like content of from 0.03% to 0.2% by mass, a Fe content of more than 0% but not more than 20% by mass, a C content of not more than 0.10% by mass, and a Mn content of not more than 1.0% by mass. The total content of Si and Al is not less than 0.80% by mass, and less than one tenth of the Cr content.

First claim

The invention claimed is:

1. An electrode material for an electrode that is provided with a chip and is for use in a spark plug, the spark plug comprising a center electrode and a ground electrode creating a space with the center electrode, the chip being provided to at least one of the electrodes,
the electrode material comprising (A) nickel as a principal component, and further including:
(B) silicon of which content in a range from 0.50% to 1.0% by mass,
(C) aluminum of which content in a range from 0.2% to 2.0% by mass,
(D) chromium of which content in a range from 12% to 34% by mass,
(E) iron of which content is more than 0% to 20% by mass,
(F) carbon of which content is not more than 0.10% by mass,
(G) manganese of which content is not more than 1.0% by mass, and
(H) at least one element selected from the group consisting of yttrium and a rare-earth element of which content in a range from 0.03% to 0.2% by mass,
wherein a total content of silicon and aluminum is not less than 0.80% by mass and is one tenth or less of the content of chromium.

2. The electrode material according to claim 1 , wherein the total content of silicon and aluminum is not less than 1.0% by mass.

3. The electrode material according to claim 1 , wherein the content of carbon is not more than 0.05% by mass, and wherein the content of manganese is not more than 0.5% by mass.

4. The electrode material according to claim 1 , wherein the content of chromium is in a range from 18% to 28% by mass.

5. The electrode material according to claim 1 , wherein the content of aluminum is not more than 1.0% by mass.

6. The electrode material according to claim 1 , wherein the content of yttrium is in a range from 0.05% to 0.15% by mass.

7. The electrode material according to claim 1 , wherein the content of iron is in a range from 7% to 15% by mass.

8. The electrode material according to claim 1 , wherein the content of iron is not more than 10% by mass.

9. A spark plug comprising:
an insulator having a through-hole in a direction of an axial line;
a center electrode disposed at a tip end portion of the insulator;
a metal shell disposed on an outer periphery of the center electrode; and
a ground electrode bonded to a tip end portion of the metal shell,
wherein at least one of the center electrode and the ground electrode is made from the electrode material according to claim 1 , and is bonded to a chip.

10. The electrode material according to claim 1 , wherein the content of silicon is in a range from 0.8% to 1.0% by mass.

Assignees

• Ngk Spark Plug Co
• Hitachi Metals Ltd

Inventors

• Yoshimoto Osamu
• Kanemaru Tomonori
• Kuno Takehito
• Tanaka Tomo-O
• Uehara Toshihiro

Classifications

• H01T13/39

  Selection of materials for electrodes · CPC title

• C22C19/05 Primary

  with chromium · CPC title