Internal-combustion engines – Igniters – Sparkers
Reexamination Certificate
2007-06-18
2010-11-02
Cronin, Stephen K (Department: 3747)
Internal-combustion engines
Igniters
Sparkers
Reexamination Certificate
active
07823556
ABSTRACT:
An electrode for an ignition device is made from a Ni-based nickel-chromium-iron alloy which has improved resistance to high temperature oxidation, sulfidation, corrosive wear, deformation and fracture includes, by weight of the alloy: 14.5-25% chromium; 7-22% iron; 0.2-0.5% manganese; 0.2-0.5% silicon; 0.1-2.5% aluminum; 0.05-0.15% titanium; 0.01-0.1% total of calcium and magnesium; 0.005-0.5% zirconium; 0.001-0.01% boron, and the balance substantially Ni. It may also include at least one rare earth element selected from the group consisting of: yttrium, hafnium, lanthanum, cerium and neodymium in amounts ranging from 0.01-0.15% by weight, and incidental impurities, including cobalt, niobium, molybdenum, copper, carbon, lead, phosphorus or sulfur. These total of these impurities will typically be controlled to limits of 0.1% cobalt, 0.05% niobium, 0.05% molybdenum, 0.01% copper, 0.01% carbon, 0.005% lead, 0.005% phosphorus and 0.005% sulfur. The ignition device may be a spark plug which includes a ceramic insulator, a conductive shell, a center electrode disposed in the ceramic insulator having a terminal end and a sparking end with a center electrode sparking surface, and a ground electrode operatively attached to said shell having a ground electrode sparking surface, the center electrode sparking surface and the ground electrode sparking surface defining a spark gap therebetween. At least one of the center electrode or the ground electrode includes the solution-strengthened Ni-based nickel-chromium-iron alloy. The Ni-based nickel-chromium-iron alloy electrodes of the invention may also include a core with thermal conductivity greater than that of the Ni-based nickel-chromium-iron alloy, such as copper or silver or their alloys.
REFERENCES:
patent: 2482580 (1949-09-01), Feichter
patent: 3907552 (1975-09-01), Kennedy
patent: 4078951 (1978-03-01), Denzine et al.
patent: 4415530 (1983-11-01), Hunt
patent: 4439498 (1984-03-01), Sadowski
patent: 4536215 (1985-08-01), Coad
patent: 4631169 (1986-12-01), Isobe et al.
patent: 4639576 (1987-01-01), Shoemaker et al.
patent: 4727740 (1988-03-01), Yabuki et al.
patent: 4742265 (1988-05-01), Giachino et al.
patent: 4784830 (1988-11-01), Ganesan et al.
patent: 4844864 (1989-07-01), Frank
patent: 4881913 (1989-11-01), Mann
patent: 5755897 (1998-05-01), Brill
patent: 5997809 (1999-12-01), Smith et al.
patent: 6242113 (2001-06-01), Kiser
patent: 6287398 (2001-09-01), Smith et al.
patent: 6447716 (2002-09-01), Cozar et al.
patent: 6603244 (2003-08-01), Sugiyama et al.
patent: 6750597 (2004-06-01), Sakura
patent: 6794804 (2004-09-01), Kanao et al.
patent: 6885135 (2005-04-01), Kanao et al.
patent: 6936217 (2005-08-01), Quadadakkers et al.
patent: 7268474 (2007-09-01), Hrastnik
patent: 2002/0158559 (2002-10-01), Sugiyama et al.
patent: 2005/0062386 (2005-03-01), Francesconi et al.
patent: 2006316343 (2006-11-01), None
“Fatigue crack propagation of nickel-base superalloys at 650 deg C. ” NASA Report E-2778; NAS 1.1587150; NASA-TM-87150. Glenn Research Center. Oct. 1, 2985.
“Impurities and trace elements in nickel-base superalloys”, Holt, R.T., Wallace, W.; International Metal Reviews. vol. 21, pp. 1-24 Mar. 1976.
Levina Iryna
Lykowski James D.
Castro Arnold
Cronin Stephen K
Dickinson Wright PLLC
Federal-Mogul World Wide Inc.
Stearns Robert L.
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