Compositions: ceramic – Ceramic compositions – Carbide or oxycarbide containing
Patent
1987-12-28
1990-01-02
Dixon, Jr., William R.
Compositions: ceramic
Ceramic compositions
Carbide or oxycarbide containing
501 87, 501 88, 501 93, 501 96, 501127, 501128, 204 66, C04B 3556, C04B 3558
Patent
active
048913413
ABSTRACT:
High surface area, submicron ceramic powders are synthesized by reducing an oxide in the presence of another metal (i.e., Mg, Al, Ca, and the like) and a source of carbon, nitrogen or boron to form a new oxide and a carbide, nitride (or carbonitride). or boride. The oxide phase can be leached out to leave submicron carbides, nitrides or borides. Alternatively milling of reacted powders allows intimate mixtures of uniform, fine grained ceramic powders to be prepared inexpensively. These multiple-phase composite powders can be formed into a body and densified using conventional techniques to form dense, fine-grained ceramic bodies. Alternatively, containment of unreacted powders and subsequent heating results in multiple-phase dense ceramics with unique microstures. Transformation toughening of composites is possible by adding zirconia or hafnia either before or after the powder synthesis step.
REFERENCES:
patent: 2886454 (1959-05-01), Todd
patent: 3143413 (1964-08-01), Krapf
patent: 4605633 (1986-08-01), DeAngelis
patent: 4605634 (1986-08-01), DeAngelis
patent: 4647405 (1987-03-01), Debely
Cutler Raymond A.
Virkar Anil
Ceramatec, Inc.
Dixon Jr. William R.
Group Karl
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