Advanced Composite Materials Corporation

William M Rogers

James F Rhodes

Thomas E Quantrille

Derek J Angier

A composite material that increases in temperature upon exposure to electromagnetic radiation includes single crystal silicon carbide whiskers and fibrils in a matrix material. Also disclosed are heat-generating objects that include the composite material, and a method of generating heat.

Composite materials and devices comprising single crystal silicon carbide heated by electromagnetic radiation

Method for producing silicon carbide fibers by mixing discontinuous isotropic carbon fibers with a silica source and exposing the mixture to a temperature of from about 1450&#xb0; C. to about 1800&#xb0; C. The silicon carbide fibers are essentially devoid of whiskers have excellent resistance to oxidation and excellent response to microwave energy, and can readily be formed into a ceramic medium employing conventional ceramic technology. The fibers also may be used for plastic and metal reinforcement.

Process for producing silicon carbide fibers essentially devoid of whiskers

Silicon carbide fibers are produced by mixing discontinuous isotropic carbon fibers with a silica source and exposing the mixture to a temperature of from about 1450&#xb0; C. to about 1800&#xb0; C. The silicon carbide fibers are essentially devoid of whiskers have excellent resistance to oxidation and excellent response to microwave energy, and can readily be formed into a ceramic medium employing conventional ceramic technology. The fibers also may be used for plastic and metal reinforcement.

Silicon carbide fibers essentially devoid of whiskers and products made therefrom

A composite and pressureless sintering process for making whisker-reinforced alumina composites using a nitride modifier. The whiskers are milled to an aspect ratio of less than 10. Green preform bodies are surrounded by a carbonaceous material during the sintering process to prevent direct exposure of the body surface to the atmosphere within the sintering furnace during the sintering step.

Pressureless sintering of whisker reinforced alumina composites

A composite and pressureless sintering process for making whisker-reinforced alumina composites using about 2 to about 7.5 wt. % of a nitride modifier consisting essentially of silicon nitride, aluminum nitride, or mixtures thereof produces a sintered body having a density of greater than about 95% theoretical.

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Greenville, SC, United States of America

William M Rogers