Compositions for ceramic igniters
AssigneeSaint-Gobain Ceramics & Plastics, Inc.
InventorsRoger J. Lin, Craig A. Willkens, Kevin C. Solofra, Thomas J. Sheridan
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Abstract
Ceramic igniter compositions are provided that contain components of conductive material and insulating material, where the insulating material component includes a relatively high concentration of metal oxide. Ceramic igniters of the invention are particularly effective for high voltage use, including throughout the range of from about 187 to 264 volts.
Claims19
A sintered ceramic igniter element comprising two cold zones with a hot zone disposed therebetween, the hot zone comprising a hot zone composition that comprises:
- (a) an electrically insulating material;
- (b) at least about 3 vol % of a semiconductive material;
- and
- (c) a metallic conductor having a resistivity of less than about 10−2 ohm-cm,
- wherein at least about 30 vol % of the hot zone composition comprises a metal oxide insulating material.
The igniter element of claim 17 wherein at least about 40 vol % of the hot zone composition comprises a metal oxide insulating material.
The igniter element of claim 17 wherein at least about 50 vol % of the hot zone composition comprises a metal oxide insulating material.
The igniter element of claim 17 wherein at least about 60 vol % of the hot zone composition comprises a metal oxide insulating material.
A sintered ceramic element comprising a cold zone and a hot zone, the hot zone comprising a hot zone composition that comprises a metal oxide in an amount of at least about 30 vol % of the hot zone composition.
Dependencies are inferred from the claim text.