Composition for small ceramic igniters
AssigneeSaint-Gobain/Norton Industrial Ceramics Corporation
InventorsCraig A. Willkens, Linda S. Bateman
Life of this patent
Estimating the term…
Abstract
A ceramic material comprising: (a) between about 50 and about 80 v/o of an electrically insulating ceramic having a resistivity of at least about 10 E+10 ohm-cm; (b) between about 10 and about 45 v/o of a semiconductive material having a resistivity of between about 1 and about 10 E+8 ohm-cm; (c) between about 5 and about 25 v/o of a metallic conductor having a resistivity of less than about 10 E-2 ohm-cm; and (d) between about 0.5 and about 20 v/o of a resistivity-enhancing compound selected from the group consisting of metallic oxides, metallic oxynitrides, rare earth oxides, rare earth oxynitrides, and mixtures thereof.
Claims15
A sintered ceramic having a hot zone composition comprising:
- (a) between 50 and 80 vol % of an electrically insulating material consisting essentially of aluminum nitride;
- (b) between 10 and 45 vol % of a semiconductive material selected from the group consisting of boron carbide and silicon carbide, and mixtures thereof;
- (c) between 5 and 25 vol % of a metallic conductor selected from the group consisting of molybdenum disilicide, tungsten disilicide and titanium nitride, and mixtures thereof;
- and
- (d) between 0.5 and 20 vol % of a resistivity enhancing compound selected from the group consisting of aluminum oxide, aluminum oxynitride, and mixtures thereof, and having an average grain size of between about 2 and 10 microns.
A sintered ceramic having a hot zone composition comprising:
- (a) between 50 and 80 vol % of an electrically insulating material consisting essentially of aluminum nitride;
- (b) between 10 and 45 vol % of a semiconductive material selected from the group consisting of boron carbide and silicon carbide, and mixtures thereof;
- (c) between 5 and 25 vol % of a metallic conductor selected from the group consisting of molybdenum disilicide, tungsten disilicide and titanium nitride, and mixtures thereof;
- and
- (d) between 2 and 8 vol % of a resistivity enhancing compound selected from the group consisting of aluminum oxide, aluminum oxynitride, and mixtures thereof.
Dependencies are inferred from the claim text.