Ceramic igniter with hot zone thickness of 0.019 inches or less

Details Ceramic igniter with hot zone thickness of 0.019 inches or less Ceramic igniter with hot zone thickness of 0.019 inches or less

1997-02-20

1998-09-01

Jeffery, John A.

Electric heating

Heating devices

Resistive element: igniter type

219553, 501 97, 501 92, 501 89, 338315, 338306, 361264, H05B 300, H01B 118

Patent

active

058013610

ABSTRACT:
A ceramic igniter comprises
a pair of conductive ends,
a hot zone disposed between the conductive ends, the hot zone having a density of at least about 95% of theoretical density and a composition comprising:
(a) between about 50 and about 80 vol % of an electrically insulating material selected from the group consisting of aluminum nitride, boron nitride, silicon nitride, and mixtures thereof.
(b) between about 10 and about 45 vol % of a semiconductive material selected from the group consisting of silicon carbide and boron carbide, and
(c) between about 5 and about 25 vol % of a metallic conductor selected from the group consisting of molybdenum disilicide, tungsten disilicide, titanium nitride, and mixtures thereof, and
a support upon which the hot zone is disposed, wherein at least a portion of the hot zone has a thickness of no more than 0.019".

REFERENCES:
patent: 4555358 (1985-11-01), Matsushita et al.
patent: 4804823 (1989-02-01), Okuda et al.
patent: 5045237 (1991-09-01), Washburn
patent: 5085804 (1992-02-01), Washburn
patent: 5191508 (1993-03-01), Axelson et al.
patent: 5514630 (1996-05-01), Willkens et al.
patent: 5564618 (1996-10-01), Axelson

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