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US 4,374,450 AGranted
Method of making an igniter plug with nickel coating on center electrode
AssigneeThe Bendix Corporation
InventorsGilbert G. Warren, Colin A. Johnson
Life of this patent
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Abstract
An igniter plug having a center electrode and annular electrode with an air gap therebetween is provided having a nickel coating on the tungsten electrode and a portion of the supporting pin therefor, and a collar situate within a portion of the annular electrode to retain a ceramic sleeve within the air gap.
Claims1
A method of making an ignitor plug of the type having a cylindrical center electrode of tungsten welded to a center supporting pin of electrically conductive material;
- an annular electrode surrounding the center electrode and spaced therefrom by an air gap, said annular electrode being comprised of a tungsten alloy in at least a portion thereof proximate the center electrode;
- and an insulating sleeve intermediate the electrodes, said method characterized by the steps of electroplating with nickel to a thickness of 25 to 75 microns the exposed surface of the center electrode, a portion of the supporting pin adjacent the center electrode and the weld;
- placing said plated igniter plug in a vacuum chamber having a maximum pressure in said chamber of 1.times.10.sup.-4 torr and heating said igniter plug while in said chamber to a temperature above 1,000 degrees centigrade.
Dependencies are inferred from the claim text.