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Colloidal processing of hydroxyapatite

Authors :
María Vallet-Regí
José M.F. Ferreira
Luis M. Rodríguez-Lorenzo
Source :
Biomaterials. 22:1847-1852
Publication Year :
2001
Publisher :
Elsevier BV, 2001.

Abstract

Reliable bioceramics are needed to implement the high requirements that living tissues demand. This work focuses on the processing steps necessary to manufacture advanced ceramics that can be used as implant devices. The influence of the heat treatment temperature on the characteristics of a precipitated hydroxyapatite (OHAp) powder was evaluated in order to obtain an appropriate specific surface area for colloidal processing. Ball milling of the calcined powders for 20 h was required to improve the rheological properties of the suspensions and the packing ability during consolidation. Different dispersing agents were tested and the first trial was made based on their effect on the zeta potential. The most promising ones were then selected and their efficiency was evaluated from rheological measurements and slip-casting performance of suspensions prepared at different solids loading. Targon 1128 was revealed to be the most efficient dispersant, enabling to prepare fluid suspensions containing 50 vol% solids and the highest green and sintered density values to be obtained.

Details

ISSN :
01429612
Volume :
22
Database :
OpenAIRE
Journal :
Biomaterials
Accession number :
edsair.doi.dedup.....e2f9062542679d27a6f1956e9880de92
Full Text :
https://doi.org/10.1016/s0142-9612(00)00366-5