Novel ceramic-metal compounds
AssigneeThe Dow Chemical Company
InventorsRonald J. Hoffman, Cindy S. Hart
Life of this patent
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Abstract
Novel ceramic-metal intercalation compounds useful in the formation of densified ceramic-metal articles are prepared, for instance, by exposing a ceramic to an organometallic compound in a low dielectric solvent. The use of the ceramic-metal compounds in the formation of articles by densification allows achievement of densified compositions having at least one of increased density, hardness, and toughness.
Claims26
A ceramic-metal intercalation compound having the formula
- M.sub.x [A]
- wherein A is a ceramic selected from the group consisting of at least one of nitrides, silicides, carbides, borides, phosphides, and arsenides, and metal alloys thereof and M is a metal capable of incorporation into the crystal structure of the ceramic, said metal (M) is selected from at least one of the metals of Groups 1a, 1b, 2a, 2b, 3a, 3b, 4a, 4b, 5a, 5b, 6a, 6b, 7a, 7b, and 8 of The Periodic Table of the Elements, and x has a value of about 0.002 to about 0.5.
A process for preparing a ceramic-metal intercalation compound having the formula:
- M.sub.x [A]
- wherein A is a ceramic, M is a metal capable of incorporation into the crystal structure of the ceramic, said metal selected from the metals of Groups 1a, 1b, 2a, 2b, 3a, 3b, 4a, 4b, 5a, 5b, 6a, 6b, 7a, 7b, and 8 of The Periodic Table of the Elements, and x has a value in the range of about 0.002 to about 0.5, said ceramic-metal compound characterized as an intercalation compound, an inclusion compound, or a solid solution, said process comprising reacting at least one ceramic with at least one ionizable organometallic compound.
A densified ceramic-prepared article using a ceramic-metal intercalation compound having the formula
- M.sub.x [A]
- wherein A is a ceramic selected from the group consisting of at least one of nitrides, silicides, carbides, borides, phosphides, and arsenides, and metal alloys thereof and M is a metal capable of incorporation into the crystal structure of the ceramic, said metal (M) is selected from the metals of Groups 1a, 1b, 2a, 2b, 3a, 3b, 4a, 4b, 5a, 5b, 6a, 6b, 7a, 7b, and 8 of The Periodic Table of the Elements, and x has a value of about 0.002 to about 0.5.
In a process for forming a ceramic article by densification of a ceramic-metal composition, said densification process comprising sintering, hot pressing, or hot isostatic pressing said ceramic-metal composition, the improvement comprising obtaining a densified article having at least one of increased density, hardness, and toughness by densifying a composition comprising a ceramic-metal intercalation compound having the formula
- M.sub.x [A]
- wherein A is a ceramic and M is a metal capable of incorporation into the crystal structure of the ceramic and x has a value of about 0.002 to about 0.5.
Dependencies are inferred from the claim text.