Ignition device having a firing tip formed from a yttrium-stabilized platinum-tungsten alloy
US6412465B1 · kind B1 · utility
22Cited by
31References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 27, 2000 |
| Grant date | Jul 2, 2002 |
| Priority date | — |
| Expiry date | Jul 27, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01T13/39
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A spark plug having ground and center electrodes that include a firing tip formed from an alloy containing platinum, tungsten, and yttrium oxide. The firing tip can take the form of a pad, rivet, ball, wire, or other shape and can be welded in place on the electrode. The firing tip provides good erosion resistance, a reduced sparking voltage, good welding and forming characteristics, as well as a minimal occurrence of oxidation of the alloy at the weld area. Desirable ranges of the relative amounts of platinum, tungsten, and yttrium are also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.