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Stoichiometry, crystallinity, and nano-scale surface morphology of the graded calcium phosphate-based bio-ceramic interlayer on Ti-Al-V

Published online by Cambridge University Press:  11 February 2011

J. D. Long ,
K. Ostrikov ,
S. Xu  and
V. Ligatchev
J. D. Long
Affiliation:
Advanced Materials and Nanostructures Laboratory, Natural Sciences, Nanyang Technological University, 637616, Singapore
K. Ostrikov
Affiliation:
Advanced Materials and Nanostructures Laboratory, Natural Sciences, Nanyang Technological University, 637616, Singapore
S. Xu
Affiliation:
Advanced Materials and Nanostructures Laboratory, Natural Sciences, Nanyang Technological University, 637616, Singapore
V. Ligatchev
Affiliation:
School of Electrical and Electronic Engineering, Nanyang Technological University, Nanyang Avenue, Singapore 639798, Singapore
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Abstract

A plasma-assisted concurrent Rf sputtering technique for fabrication of biocompatible, functionally graded CaP-based interlayer on Ti-6Al-4V orthopedic alloy is reported. Each layer in the coating is designed to meet a specific functionality. The adherent to the metal layer features elevated content of Ti and supports excellent ceramic-metal interfacial stability. The middle layer features nanocrystalline structure and mimics natural bone apatites. The technique allows one to reproduce Ca/P ratios intrinsic to major natural calcium phosphates. Surface morphology of the outer, a few to few tens of nanometers thick, layer, has been tailored to fit the requirements for the bio-molecule/protein attachment factors. Various material and surface characterization techniques confirm that the optimal surface morphology of the outer layer is achieved for the process conditions yielding nanocrystalline structure of the middle layer. Preliminary cell culturing tests confirm the link between the tailored nano-scale surface morphology, parameters of the middle nanostructured layer, and overall biocompatibility of the coating.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 737 , 2002 , F3.42
Copyright
Copyright © Materials Research Society 2003

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References

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