Spark plug and method for producing same
AssigneeNgk Spark Plug Co., Ltd.
InventorTsutomu Shibata
Life of this patent
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Abstract
An object of the present invention is to provide a spark plug which has more excellent impact resistance with electrical conductivity and airtightness kept excellent. In the invention, each of first and second electrically conductive sealing layers (17) and (19) is made of electrically conductive glass containing a glass component and a metal component. The metal component at least contains a Cu—Zn alloy which contains Cu as a first component, and Zn as a second component.
Claims11
A spark plug comprising:
- an insulator having a through-hole formed in an axial direction;
- a terminal attachment disposed on one end side of said insulator;
- a center electrode disposed on other end side of said insulator;
- and an electrically conductive connection layer disposed in said through-hole for electrically connecting said terminal attachment and said center electrode to each other, said electrically conductive connection layer including at least one electrically conductive sealing layer connected to at least one of said terminal attachment and said center electrode, wherein said electrically conductive sealing layer is made of electrically conductive glass containing a glass component, and a metal component which at least contains a Cu—Zn alloy.
A method for producing a spark plug including an insulator having a through-hole formed in an axial direction, a terminal attachment disposed on one end side of said insulator, a center electrode disposed on other end side of said insulator, and an electrically conductive connection layer disposed in said through-hole for electrically connecting said terminal attachment and said center electrode to each other, said electrically conductive connection layer including at least one electrically conductive sealing layer connected to at least one of said terminal attachment and said center electrode, said method comprising the steps of:
- filling said through-hole of said insulator with electrically conductive glass powder containing glass powder and metal powder containing at least Cu—Zn alloy powder;
- and softening said electrically conductive glass powder to form said electrically conductive sealing layer.
Dependencies are inferred from the claim text.