# US 2012/0074829 A1 · Alloys for spark ignition device electrode spark surfaces

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- Number: US 2012/0074829 A1
- Document ID: US20120074829A1
- Status: Published application
- Kind: A1
- Application number: 13/242,353
- Filed: 2011-09-23
- Published: 2012-03-29
- Earliest claimed: 2008-03-07
- Inventors: James D. Lykowski
- Web page: https://patentgrep.com/patent/US20120074829A1

## CPC

- H01T 13/39: Selection of materials for electrodes
- H01T: SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES (overvoltage protection circuits H02H)

## Abstract

An electrode for a spark ignition device, including a spark plug, which includes an alloy consisting essentially of, in weight percent, at least 15% Ni and the balance substantially Pt, and more particularly 15-45% Ni and the balance substantially Pt; 5-35% W, and the balance substantially Pd; and 5-15% Ni, 5-15% Pt, less than 10% Ir, and the balance substantially Pd.

## Claims

### Claim 1

A spark ignition device having a center electrode and a ground electrode and each including a noble metal-based firing tip joined to the respective electrodes to present respective sparking surfaces of said sparking tips defining a spark gap in a space therebetween, said sparking tips being fabricated of an alloy consisting essentially of, in weight percent, 20-45% Pd, 2-18% Ir, less than 5% W and the balance substantially Pt, wherein the amount of said Pt is greater than 50%.

### Claim 2 (depends on 1)

The spark ignition device of claim 1, wherein said alloy comprises, in weight percent, 25% Pd, 15% Ir, 2% W, and the balance substantially Pt.

### Claim 3 (depends on 1)

The spark ignition device of claim 1, wherein said alloy further comprises at least one reactive element selected from the group consisting of: yttrium, hafnium, lanthanum, cerium, zirconium, tantalum and neodymium.

### Claim 4 (depends on 3)

The spark ignition device of claim 3, wherein said reactive element is present in an amount of 0.01-0.2% by weight.