Igniters and methods of manufacture of igniters

Details Igniters and methods of manufacture of igniters Igniters and methods of manufacture of igniters

1988-12-02

1990-05-15

Wieder, Kenneth

Electric lamp and discharge devices

Spark plugs

Non-conducting material in or adjacent gap

313141, 445 7, H01T 1320, H01T 2102

Patent

active

049260880

ABSTRACT:
An electrical igniter has an outer shell with a tungsten forward end which forms an annular outer electrode. A central rod extends axially within the shell and has a tungsten forward end forming an inner electrode which is separated from the outer electrode by a semiconductive surface discharge path. The inner and outer electrodes both have chromium diffused into the tungsten to form surface layers that are oxidation resistant at high temperatures. The electrodes are made by placing the tungsten forward ends in a furnace in a chromium rich atmosphere between 1000 and 1200 degrees Centrigrade for between 10 to 24 hours and allowing them to cool in the furnace. Chromium is removed from the rear ends of the tungsten parts before joining them to the rear parts of the electrodes which are of different metals.

REFERENCES:
patent: 3958144 (1976-05-01), Franks
patent: 3984717 (1976-10-01), Romanowski et al.
patent: 3995184 (1976-11-01), Insley
patent: 4081710 (1978-03-01), Heywood et al.
patent: 4853582 (1989-08-01), Sato et al.

Affiliated with

Also associated with

Rating

Igniters and methods of manufacture of igniters does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Igniters and methods of manufacture of igniters, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Igniters and methods of manufacture of igniters will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-623216