Claims
- 1. 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.
Parent Case Info
This is a continuation, of application Ser. No. 45,042, filed June 4, 1979, and now abandoned.
US Referenced Citations (8)
Continuations (1)
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Number |
Date |
Country |
Parent |
45042 |
Jun 1979 |
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