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http://hdl.handle.net/10773/20391
Title: | Influence of Mg-doping, calcium pyrophosphate impurities and cooling rate on the allotropic alpha <->beta-tricalcium phosphate phase transformations |
Author: | Torres, P. M. C. Abrantes, J. C. C. Kaushal, A. Pina, S. Doebelin, N. Bohner, M. Ferreira, J. M. F. |
Keywords: | BETA-TRICALCIUM PHOSPHATE NEUTRON POWDER DIFFRACTION X-RAY-DIFFRACTION ALPHA-TRICALCIUM SETTING REACTION HIGH-TEMPERATURE BONE SYSTEM SUBSTITUTION CEMENT |
Issue Date: | 2016 |
Publisher: | ELSEVIER SCI LTD |
Abstract: | Alpha and beta-tricalcium phosphates are allotropic phases which play a very important role as bone graft substitutes, namely in calcium phosphate cements. Despite extensive research efforts, contradictory reports exist on the importance of quenching for maintaining alpha-TCP purity. The role of calcium pyrophosphate impurities derived from a certain calcium-deficiency, hydroxyapatite impurities derived from calcium excess, and various ionic substitutions on thermal stability of these phases was not yet fully disclosed. The present work reports on the kinetics of alpha <->beta-TCP phase transformations of calcium-deficient TCP powders with different Mg-doping extents (0-5 mol%) prepared by precipitation. Mg clearly enhanced the thermal stability of beta-TCP. The effect of cooling rate was more complex and interdependent on the Mg content and the heat treatment schedule. High alpha-TCP contents were retained upon cooling at 5 degrees C min(-1) for Mg <= 1 mol% or upon quenching from 1550 degrees C for Mg contents <= 2 mol%. (C) 2015 Elsevier Ltd. All rights reserved. |
Peer review: | yes |
URI: | http://hdl.handle.net/10773/20391 |
DOI: | 10.1016/j.jeurceramsoc.2015.09.037 |
ISSN: | 0955-2219 |
Publisher Version: | 10.1016/j.jeurceramsoc.2015.09.037 |
Appears in Collections: | CICECO - Artigos |
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