Process for making a silicon carbide composition

Details Process for making a silicon carbide composition Process for making a silicon carbide composition

1989-04-14

1990-09-18

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Carbide or oxycarbide containing

501 95, 264 66, C04B 3556

Patent

active

049578855

ABSTRACT:
A process for preparing a ceramic composite with improved properties is disclosed. A material which contains at least 85 percent of a mixture of silicon carbide and alumina is heated to a temperature of from about 350 to about 500 degrees centigrade and, after it reaches this temperature, maintained there for at least 5 minutes. Thereafter, the temperature of the material is raised to 1,250-1,350 degrees centigrade and, after reaching this temperature, the material is maintained there under a pressure of from about 5 to about 15 p.s.i. for at least 30 minutes. Thereafter, the temperature of the material is raised to 1,650-1,750 degrees centigrade, and it is thereafter maintained at such temperature for from about 30 to about 90 minutes.

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"Study of Solid-State Aluminothermal Reactions: Influence of Activation and Moderation Processes" George T. Hida (Thesis, Israel Institute of Technology, Haifa, Israel, Apr. 1987).

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