Superhard composite materials including compounds of carbon and

Details Superhard composite materials including compounds of carbon and Superhard composite materials including compounds of carbon and

1995-02-14

1998-07-07

Turner, Archene

Stock material or miscellaneous articles

Composite

Of inorganic material

428469, 428472, 428356, 428217, 428212, C23C 1406

Patent

active

057766150

ABSTRACT:
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.

REFERENCES:
patent: 4664976 (1987-05-01), Kimura et al.
patent: 5110679 (1992-05-01), Haller et al.
patent: 5405515 (1995-04-01), Fang
patent: 5441624 (1995-08-01), Chan et al.
Mirkarimi et al., "Enhanced hardness in lattice-matched single-crystal Tin/V.sub.0.6 Nb.sub.0.4 N superlattices;" Appl. Phys. Lett 57 (25), Dec. 17, 1990, pp. 2654-2656.
Helmerson et al., "Growth of single-crystal TiN/VN strained-layer superlattices with extremely high mechanical hardness;" J. Appl. Phys. 62(2), Jul. 15, 1987, pp. 481-484.

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