Electric lamp and discharge devices – Spark plugs – Non-conducting material in or adjacent gap
Patent
1985-10-07
1987-12-15
Moore, David K.
Electric lamp and discharge devices
Spark plugs
Non-conducting material in or adjacent gap
313137, 313144, H01J 1320
Patent
active
047135743
ABSTRACT:
The prevention of electrode material erosion by undercutting in the outer electrode shell of igniter electrodes of jet engine ignition systems is prevented by the application of an electrical insulation coating. The coating is applied to the surface of the outer electrode shell which faces the ceramic insulation around the center electrode where erosion patterns are known to occur. The insulation material is selected from electrical insulation substances such as oxides of aluminum, tungsten, magnesium, beryllium or zirconium by choosing a non-porous electrical insulating substance with thermal expansion characteristics approximately equalling those of the outer electrode shell. Since a typical outer electrode shell is composed of 446 stainless steel, an optimum choice for the electrical insulation coating is AL.sub.2 O.sup.3 deposited with a coating thickness of between 5 and 10 mils.
REFERENCES:
patent: 2272558 (1942-02-01), Hall
patent: 2786158 (1957-03-01), Tognola
patent: 2900547 (1959-08-01), Engel
patent: 3014151 (1961-12-01), Segall
patent: 3278785 (1966-10-01), Hauth, Jr.
patent: 3469398 (1969-09-01), Schafer
patent: 3854067 (1974-12-01), Morgan
patent: 3883762 (1975-05-01), Harris et al.
patent: 3890518 (1975-06-01), Tombs
patent: 4337408 (1982-06-01), Sone et al.
Auton William G.
Moore David K.
O'Shea Sandra L.
Singer Donald J.
The United States of America as represented by the Secretary of
LandOfFree
Igniter electrode life control does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Igniter electrode life control, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Igniter electrode life control will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1222148