Fuel ignitor comprising a novel silicon carbide composition...

H - Electricity – 01 – B

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H01B 1/02 (2006.01) C04B 35/575 (2006.01) F23Q 7/00 (2006.01) F23Q 7/22 (2006.01) H05B 3/14 (2006.01)

Patent

CA 1102103

ABSTRACT This invention comprises a silicon carbide composition, a process for manufacturing the silicon carbide composition, and an electrical fuel ignitor comprising the silicon carbide composition. The silicon carbide composition comprises hot pressed particulate silicon carbide, and sufficient negative doping elements to reduce the cold volume resistivity of the composition to less than 1.25 ohm-cms, and the ratio of cold to hot resistivities to less than 12 to 1. The composition can be manufactured by hot pressing silicon carbide particles, smaller than 20 microns, in a nitrogen containing atmosphere, at a temperature from 1800 to 2400°C and a pressure between 70 and 750 Kg/sq. cm until the silicon carbide has a density of at least 2.5 grams per cubic centimeter. The fuel ignitor is an elongated body of the silicon carbide composition, for example a bar from 0.5 to 5 centimeters having a cross-sectional area from 0.0002 to 0.007 sq. cms.

271078

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