Plastic and nonmetallic article shaping or treating: processes – Including step of generating heat by friction
Patent
1988-12-02
1991-02-05
Bell, Mark L.
Plastic and nonmetallic article shaping or treating: processes
Including step of generating heat by friction
501 89, 264 66, C04B 3510, C04B 3556
Patent
active
049902954
ABSTRACT:
A process for preparing a ceramic composite which is comprised of alpha silicon carbide whiskers and alpha aluminum oxide powder is disclosed. In the first step of this process, there is provided a slurry comprised of from about 80 to about 92 volume percent of solid material and from about 20 to about 8 volume percent of a non-aqueous liquid. In this slurry, the solid material comprises from about 30 to about 38 weight percent of aluminum material, from about 10 to about 14 weight percent of amorphous carbon, and from about 52 to about 62 weight percent of silica.
The slurry provided in the first step of this process is thereafter passed through a twin-deck sieve to pelletize it.
The pellets are then dried to a moisture content of from about 0.1 to about 1.0 percent, preheated to a temperature of from about 200 to about 300 degrees centigrade, and then ignited with an ignition source at a temperature of at least 670 degrees centigrade, thereby combusting and producing a material comprises of a composite containing alpha silicon carbide and alumina.
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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).
Bell Mark L.
Benchmark Structural Ceramics Corporation
Greenwald Howard J.
Jones Deborah
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