Title:
イリジウムベースの合金から形成される電極先端部を有する点火装置
Document Type and Number:
Japanese Patent JP2008507813
Kind Code:
A
Abstract:
An ignition device such as a spark plug having ground and center electrodes, at least one of which includes a firing tip formed from an alloy containing iridium, rhodium, tungsten, and zirconium. With the inclusion of tungsten and zirconium in the alloy, the percentage of rhodium can be kept relatively low without sacrificing the erosion resistance or reduced sparking voltage of the firing tip. In one embodiment, the firing tip contains 2% rhodium, 0.3% tungsten, 0.02% zirconium, and the balance iridium.
Inventors:
Tinwell, Paul
Orhera, Ghatev
Hide, robin
Coupland, Duncan Earl
Orhera, Ghatev
Hide, robin
Coupland, Duncan Earl
Application Number:
JP2007522070A
Publication Date:
March 13, 2008
Filing Date:
July 25, 2005
Export Citation:
Assignee:
FEDERAL MOGUL IGNITION COMPANY (U.K.) LIMITED
JOHNSON MATTHEY PUBLIC LIMITED COMPANY
JOHNSON MATTHEY PUBLIC LIMITED COMPANY
International Classes:
H01T13/39; C22C5/04; F02P13/00; H01T1/00; H01T13/20; H01T21/02; H01T
Domestic Patent References:
| JP2003317896A | 2003-11-07 |
Foreign References:
| WO2004007782A1 | 2004-01-22 |
Attorney, Agent or Firm:
Kuro Fukami
Toshio Morita
Yoshihei Nakamura
Yutaka Horii
Hisato Noda
Masayuki Sakai
Toshio Morita
Yoshihei Nakamura
Yutaka Horii
Hisato Noda
Masayuki Sakai