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Pulsed Laser Deposition of Biocompatible Thin Films: Calcium Hydroxylapatrte and Other Calcium Phosphates

Published online by Cambridge University Press:  15 February 2011

C. M. Cotell ,
D. B. Chrisey  and
K. S. Grabowski
C. M. Cotell
Affiliation:
Surface Modification Branch, Naval Research Laboratory, Washington, D.C. 20375–5000
D. B. Chrisey
Affiliation:
Surface Modification Branch, Naval Research Laboratory, Washington, D.C. 20375–5000
K. S. Grabowski
Affiliation:
Surface Modification Branch, Naval Research Laboratory, Washington, D.C. 20375–5000
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Abstract

Calcium phosphate-based ceramics were deposited on Ti, Ti-6Al-4V and Si substrates by pulsed laser deposition. The calcium phosphate phase (amorphous, α- or β-tricalciumn phosphate, tetracalcium phosphate, or hydroxylapatite), Ca/P ratio and surface morphology of the films were related to deposition conditions. At substrate temperatures <400°C, films were amorphous. Above 400°C, the gaseous environment during deposition determined the crystalline phase of the films. In O2, deposition of α-tricalcium phosphate was favored between 400 and 700°C and β-tricalcium phosphate was favored above 700°C. Films deposited in low pressures of O2 (<0.05 Torr) were P-deficient. The correct stoichiometry was approached as the pressure of O2 in the chamber during deposition increased. In water vapor-enriched inert gas environments, deposition of hydroxylapatite was observed at temperatures between 400 and 700°C and tetracalcium phosphate was observed at temperatures above 700°C. The surface morphology of hydroxylapatite films depended on the temperature of deposition. Surfaces deposited at higher substrate temperatures showed more recrystallization than those deposited at lower substrate temperatures.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 252: Symposium T – Tissue-Inducing Biomaterials , 1991 , 3
Copyright
Copyright © Materials Research Society 1992

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References

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