SYNTHESIS AND MECHANICAL PROPERTIES OF CRYSTALLINE CARBON NITRIDE SUPERHARD COATINGS

Yip-Wah Chung
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Yip-Wah Chung: Department of Materials Science and Engineering, Robert R. McCormick School of Engineering and Applied Science, Northwestern University, Evanston, Illinois 60208, USA

Surface Review and Letters (SRL), 1996, vol. 03, issue 04, 1597-1602

Abstract: Crystallineβ-C3N4was predicted to have mechanical properties similar to those of diamond. Until recently, only amorphous carbon nitride coatings were made in spite of numerous attempts. This lack of success in making crystalline coatings suggests thatβ-C3N4is metastable. Using TiN as seeding layers and under proper processing conditions, we were able to synthesize fully crystalline carbon nitride composite coatings with hardness in the 45–55 GPa range, which is at the low end of diamond. Suggestions for further improvements and implementation with other deposition techniques will be made.

Date: 1996
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DOI: 10.1142/S0218625X96002588

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