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Structure and Mechanical Properties of Functionally-Graded Nanostructured Metalloceramic Coatings

Published online by Cambridge University Press:  10 February 2011

Shane A. Catledge ,
Yogesh K. Vohra ,
Shanna Woodard  and
Ramakrishna Venugopalan
Shane A. Catledge
Affiliation:
Department of Physics, University of Alabama at Birmingham Birmingham, AL 35294-1170, U.S.A.
Yogesh K. Vohra
Affiliation:
Department of Physics, University of Alabama at Birmingham Birmingham, AL 35294-1170, U.S.A.
Shanna Woodard
Affiliation:
Department of Biomedical Engineering, University of Alabama at Birmingham Birmingham, AL 35294-4440, U.S.A.
Ramakrishna Venugopalan
Affiliation:
Department of Biomedical Engineering, University of Alabama at Birmingham Birmingham, AL 35294-4440, U.S.A.
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Abstract

A functionally graded nanocrystalline metalloceramic coating on cobalt-chrome alloy was investigated using thin film x-ray diffraction (XRD), cross-sectional transmission electron microscopy (TEM), nanoindentation, and scratch adhesion testing. The gradual transition in bonding from metallic (Cr/CrTi) near the interface to predominantly covalent (CrTiN) near the surface provides a combination of high toughness and high surface hardness. XRD analysis of the (CrTiN) coating suggests a cubic sodium chloride type phase structure with lattice parameter a = 4.2169±0.0035 Å. The surface layer structure is described as a tertiary Ti-N-Cr disordered solid solution that is predominantly cubic TiN, but with some Cr atoms substituted for Ti. TEM shows a transition from equiaxed 20-40 nm-sized grains at the surface to larger, elongated columnar grains below the surface. Nanoindentation measurements of the coating result in a hardness of 27 GPa and Young's modulus of 320 GPa. In addition, the high plasticity of 55% observed for this coating represents an increase in toughness over other ceramic coatings having similar hardness. The unique, functionally graded, smooth nanocrystalline metalloceramic coating structure provides an opportunity to reduce wear and increase longevity of total hip joint replacements.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 778: Symposium U – Mechanical Properties Derived from Nanostructuring Materials , 2003 , U7.8
Copyright
Copyright © Materials Research Society 2002

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