Refractory electrical device
AssigneeNorton Company
InventorMalcolm E. Washburn
Life of this patent
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Abstract
The present invention is an electrical device made up of a mixture of silicon carbide and molybdenum disilicide, and may include silicon nitride or aluminum nitride or boron nitride. An electrical device is also disclosed which is particularly suited for use as an igniter in liquid and gas fuel burning systems. The device is made up of a sintered, preferably hot-pressed, mixture of fine powders of aluminum nitride or silicon nitride, silicon carbide and molybdenum disilicide where, when all three are present, they are present in substantial quantities.
Claims11
An igniter for fluid fuels comprised of a hot zone and cold ends consisting essentially of a sintered mixture of 5 to 50% by volume of molybdenum disilicide and 50 to 95% by volume of a mixture of silicon carbide and silicon nitride;
- 4% or less of open porosity, a room temperature flexural strength of at least 30,000 psi (207 MPa), a resistivity range of from 0.0001 to 90 ohm centimeters, a ratio of room temperature resistivity to that at 1200.degree. C. of from 0.2 to 19.8, a response time from room temperature to about 1200.degree. C. of less than 25 seconds, said igniter consuming from about 20 to about 50 watts per square centimeter of radiating surface at 1200.degree. C.
Dependencies are inferred from the claim text.