Spark plug for internal combustion engine
US-2020259315-A1 · Aug 13, 2020 · US
Spark plug
US10958045B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10958045-B2 |
| Application number | US-201916965752-A |
| Country | US |
| Kind code | B2 |
| Filing date | Sep 3, 2019 |
| Priority date | Nov 9, 2018 |
| Publication date | Mar 23, 2021 |
| Grant date | Mar 23, 2021 |
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Abstract
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In a spark plug, a base material contains 50 mass % or more of Ni, 8 mass % or more and 40 mass % or less of Cr, 0.01 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 5 mass % or less of Fe. A discharge member contains at least Pt of a P group (Pt, Rh, Ir, and Ru) and Ni. The atomic concentration K of the P group of the discharge member, the atomic concentration L of the P group of the base material, the atomic concentration M of Ni of the discharge member, and the atomic concentration N of Ni of the base material satisfy (K+L)/(M+N)≤1.14.
First claim
Opening claim text (preview).
The invention 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 diffusion 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, 0.01 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 5 mass % or less of Fe, wherein the discharge member is an alloy containing Pt most and containing Ni, or the alloy further containing at least one of Rh, Ir, and Ru, and wherein, when Pt, Rh, Ir, and Ru are considered as a P group, K (at %) represents an atomic concentration of the P group of the discharge member, L (at %) represents an atomic concentration of the P group of the base material, M (at %) represents an atomic concentration of Ni of the discharge member, and N (at %) represents an atomic concentration of Ni of the base material, (K+L)/(M+N)≤1.14 is satisfied. 2. The spark plug according to claim 1 , wherein the base material and the discharge member satisfy (K+L)/(M+N)≤0.82. 3. The spark plug according to claim 1 , or claim 2 , wherein, when X (mass %) represents a content ratio of Si of the base material and Y (mass %) represents a content ratio of Fe of the base material, X/Y≥0.04 is satisfied. 4. The spark plug according to claim 1 , wherein, when X (mass %) represents a content ratio of Si of the base material and Y (mass %) represents a content ratio of Fe of the base material, 0.04≤X/Y≤1000 is satisfied. 5. The spark plug according to claim 1 , wherein, when X (mass %) represents a content ratio of Si of the base material and Y (mass %) represents a content ratio of Fe of the base material, X/Y≥0.35 is satisfied. 6. The spark plug according to claim 1 , wherein the base material contains 0.001 mass % or more and 2 mass % or less of Fe. 7. 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, 0.01 mass % or more and 0.07 mass % or less of C, and 0.001 mass % or more and 2 mass % or less of Fe. 8. 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.
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- What does patent US10958045B2 cover?
- In a spark plug, a base material contains 50 mass % or more of Ni, 8 mass % or more and 40 mass % or less of Cr, 0.01 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 5 mass % or less of Fe. A discharge member contains at least P…
- Who is the assignee on this patent?
- Ngk Spark Plug Co
- What technology area does this patent fall under?
- Primary CPC classification H01T13/20. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Mar 23 2021 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 3 related publications on this page (citations in our corpus or others sharing the same primary CPC).