FORMATION OF STRUCTURE AND SURFACE MORPHOLOGY IN HYDROXYAPATITE TYPES OF CERAMICS DURING SINTERING

J. J. Prieto-Valdés, S. Alfaro Hernández, G. Rueda Morales and V. P. Gortcheva
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J. J. Prieto-Valdés: Association for Biomaterials R & D, Inc., PO Box 01-0648, Miami, FL 33101-0648, USA
S. Alfaro Hernández: Esc. Sup. de Física y Matemáticas, Instituto Politécnico Nacional de Mexico, 07738, D.F., Mexico
G. Rueda Morales: Esc. Sup. de Física y Matemáticas, Instituto Politécnico Nacional de Mexico, 07738, D.F., Mexico
V. P. Gortcheva: Departimento de Física, CINVESTAV-IPN, 07740, D.F., Mexico

Surface Review and Letters (SRL), 1997, vol. 04, issue 04, 671-677

Abstract: Hydroxyapatite powders with Ca/P ratios of 1.67 and 1.5 were processed by ceramic methods and studied during sintering using X-ray diffraction and atomic force microscopic methods, paying particular attention to the structural and surface morphology formations of the ceramics during sintering. For stoichiometric samples sintering starts at 1000°C through the formation of a quasihexagonal grain configuration. This morphology is conserved after the decomposition processes of hydroxyapatite in the range of 1200–1450°C. For calcium-deficient hydroxyapatite, sintering starts at temperatures close to 800°C through the formation of a fibrous structure. After reaching 1450°C these samples are composed of tricalcium phosphate, thus conserving the fibrous morphology, which resembles biological hard tissue.

Date: 1997
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DOI: 10.1142/S0218625X97000663

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