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Superhard composite materials including compounds of carbon and nitrogen deposited on metal and metal nitride carbide and carbonitride

United States Patent

5,725,913
March 10, 1998
View the Complete Patent at the US Patent & Trademark Office
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.
Wong; Ming-Show (Northbrook, IL), Li; Dong (Evanston, IL), Chung; Yin-Wah (Wilmette, IL), Sproul; William D. (Palantine, IL), Chu; Xi (Evanston, IL), Barnett; Scott A. (Evanston, IL)
Northwestern University (Evanston, IL)
08/ 735,685
October 23, 1996
CONTRACTURAL ORIGIN OF THE INVENTION This invention was made with Government support under Grant Number: NSF MSS-9203239 awarded by the National Science Foundation and DE-FG02-90ER45434 awarded by the U.S. Department of Energy. The Government may have certain rights in the invention.