Plastic and nonmetallic article shaping or treating: processes – Including step of generating heat by friction
Patent
1991-04-18
1993-02-23
Derrington, James
Plastic and nonmetallic article shaping or treating: processes
Including step of generating heat by friction
264 56, 264311, 501 1, C04B 3564
Patent
active
051887800
ABSTRACT:
A method of preparing dense ceramic product is described, wherein a coagulated network of ceramic powder particles in water is formed and then treated to increase the volume fraction of particles, thereby forming a water-saturated powder compact. The compact is formed into a desired shape and fired to provide the dense ceramic product. A coagulated network may advantageously be formed by mixing a ceramic powder with water at a pH that produces a net surface charge, to form a dispersed slurry and adding a sufficient amount of salt to the dispersed slurry to cause particles within the slurry to form the coagulated network. In view of the unique rheological properties of the powder compacts prepared from coagulated networks of ceramic powder particles, the compact may be processed into complex, near-net-shaped forms by introducing the compact into a mold and subjecting the mold to vibration, whereby the compact adopts the shape of the mold; once removed from the mold, the compact retains its shape without distortion.
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Lange Frederick F.
Velamakanni Bhaskar V.
Derrington James
Regents of the University of California
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