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AssigneeNorthwestern University
InventorsMing-Show Wong, Dong Li, Yip-Wah Chung, William D. Sproul, Xi Chu, Scott A. Barnett
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A composite material having high hardness comprises a carbon nitrogen compound, such as CN.sub.x where x is greater than 0.1 and up to 1.33, deposited on a metal or metal compound selected to promote deposition of substantially crystalline CN.sub.x. The carbon nitrogen compound is deposited on a crystal plane of the metal or metal compound sufficiently lattice-matched with a crystal plane of the carbon nitrogen compound that the carbon nitrogen compound is substantially crystalline. A plurality of layers of the compounds can be formed in alternating sequence to provide a multi-layered, superlattice coating having a coating hardness in the range of 45-55 GPa, which corresponds to the hardness of a BN coating and approaches that of a diamond coating.
A composite material having high hardness, comprising a plurality of layers comprising a carbon nitrogen compound in alternating sequence with a metal or metal compound as a seed material, said carbon nitrogen compound being deposited on a crystal plane of said metal or said metal compound sufficiently lattice-matched with a crystal plane of said carbon nitrogen compound that said carbon nitrogen compound is substantially crystalline, said layers being ion bombardment densified during deposition so as to be substantially free of voids and exhibiting a collective hardness greater than a hardness of any individual layer.
A composite material having high hardness, comprising:
Dependencies are inferred from the claim text.