Process for making a silicon carbide whisker reinforced alumina

Details Process for making a silicon carbide whisker reinforced alumina Process for making a silicon carbide whisker reinforced alumina

1988-10-06

1991-07-16

Bell, Mark L.

Plastic and nonmetallic article shaping or treating: processes

Including step of generating heat by friction

501 89, 501 95, 264 66, C04B 3510, C04B 3556

Patent

active

050323326

ABSTRACT:
A process for preparing a ceramic composite material containing alpha silicon carbide whiskers is disclosed.
In the process, a slurry containing non-aqueous liquid and aluminum material, amorphous carbon, and silica is provided. This slurry is thereafter pelletized, the pellets are dried, the dried pellets are preheated, and the preheated pellets are then ignited. The ignited pellets undergo an exothermic reaction, forming the composite containing alpha silicon carbide whiskers.
The composite material is heat-treated by first heating it to a temperature of 900-1100 degrees centigrade at a rate of 8-15 degrees per minute, and then heating it to a temperature of 1,250-1,350 degrees centigrade at a rate of 2-5 degrees per minute.

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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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