Structural and mechanical properties of nanostructured metalloceramic coatings on cobalt chrome alloys

Catledge, Shane A.; Vohra, Yogesh K.; Woodard, S.; Venugopalan, R.
March 2003
Applied Physics Letters;3/10/2003, Vol. 82 Issue 10, p1625
Academic Journal
A functionally graded nanocrystalline metalloceramic coating on cobalt-chrome alloys was investigated with thin-film x-ray diffraction (XRD), nanoindentation, and scratch adhesion testing. The gradual transition in bonding from metallic to predominantly covalent along with a nanocrystalline grain structure provides a unique material system with excellent strength, toughness, and adhesion properties. XRD analysis of the (CrTiN) coating suggests a cubic sodium chloride phase structure with a = 4.2169 ± 0.0035 Å. Nanoindentation measurements of the coating result in a hardness of 27 GPa and Young's modulus of 320 GPa. The graded metallic/covalent nature of the coating with high plasticity also results in excellent film/substrate adhesion as shown by an average critical force of 44 ± 5 N in scratch testing.


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