Compositions: ceramic – Ceramic compositions – Refractory
Patent
1990-06-04
1991-12-31
Dixon, Jr., William R.
Compositions: ceramic
Ceramic compositions
Refractory
501100, 501153, 501 96, 75233, 75235, 75244, 419 12, 419 19, C04B 3510, C04B 3558, C22C 2912
Patent
active
050772465
ABSTRACT:
A method for the preparation of ceramic composites containing at least aluminum oxide and aluminum boride, and the composite materials that result from the method. Intimate mixtures of finely-divided powdered aluminum metal and anhydrous boric oxide, with ratios (by weight) of about 0.5 to twenty parts of aluminum metal to one part of boric oxide, are subjected to a temperature to cause a complete reaction between the starting materials. If the ratio is above about 1.25 parts of aluminum to one part of boric oxide, the resultant product will include aluminum in addition to the aluminum oxide and aluminum boride. The ratio is selected to provide the desired hardness and toughness. Ratios between about 1 and 1.2 provide a composite having the highest hardness, with greater amounts of aluminum metal providing increased toughness. Several compositions are described, with hot pressing typically being used to provide the desired heating cycle. Typically, the mixed powders are hot pressed at about 1500 and 1600 degrees C. for about 45 minutes at 6000 psi to produce a product approaching 100% theoretical density. When additional strength is desired, various reinforcing materials can be added to the base mixture, with these reinforcing materials typically being ceramic fibers, whiskers and platelets. The resultant materials will have application as cutting tools, wear parts, armor, insualtion, etc. High yields are achieved, and the method is inexpensive.
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Padron Sally G.
Weaver Samuel C.
Apollo Concepts, Inc.
Dixon Jr. William R.
Marcantoni Paul
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