Glow plug having cobalt/iron alloy regulating filament

Details Glow plug having cobalt/iron alloy regulating filament Glow plug having cobalt/iron alloy regulating filament

1989-07-21

1992-03-03

Bartis, Anthony

Electric heating

Heating devices

Resistive element: igniter type

123145A, 219553, 338 22R, F23Q 700, H05B 312, H05B 102, H01C 304

Patent

active

050935550

ABSTRACT:
A sheathed-element glow plug has a front resistance heating filament connected in series with a rear resistance regulating filament having a higher positive temperature coefficient (PTC) than the front filament. The rear filament is made of cobalt/iron alloy consisting of 44-80% by weight cobalt, 20-35% by weight iron, up to 1% miscellaneous components and nickel, if present, in an amount of 0 to less than 15% by weight. The alloy has a resistance ratio (20.degree.-1000.degree. C.) which is no more than approximately 7.5 in the range from about 100.degree. C. to between about 400.degree. C. to about 600.degree. C., and which ratio rises sharply to values from 7.5 to greater thin 12 in the range from 400.degree. C. to 600.degree. C. to about 900.degree. C.

REFERENCES:
patent: 4168344 (1979-09-01), Shapiro et al.
patent: 4423309 (1983-12-01), Murphy et al.
patent: 4556781 (1985-12-01), Bauer
patent: 4636614 (1987-01-01), Itoh et al.
"Bosch Techn Berichte" (Bosch Technical Reports) 5, 1977 by H. Weil, pp. 279-286.

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