Characteristics of synthetic hydroxyapatites and attempts to improve their thermal stability

被引：54
作者：
Tampieri, A [1 ]
Celotti, G [1 ]
Sprio, S [1 ]
Mingazzini, C [1 ]
机构：
[1] CNR, Res Inst Ceram Technol, I-48018 Faenza, RA, Italy
来源：
MATERIALS CHEMISTRY AND PHYSICS | 2000年 / 64卷 / 01期
关键词：
biomaterials; ceramics; chemical synthesis; thermal properties;
D O I：
10.1016/S0254-0584(99)00252-7
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Synthetic hydroxyapatites (HA) with widely different crystallinity degrees were prepared starting from calcium hydroxide and phosphoric acid. The powders were carefully characterised by various physico-chemical techniques. Additions of Ca(OH)(2) were performed in order to improve HA thermal stability to firing treatments up to temperatures significantly higher than those commonly employed for safe HA sintering. A positive effect in this sense was found. yielding HA almost purr samples up to 1400-1450 degrees C and maintaining considerable HA concentrations up to 1600 degrees C. An explanation in terms of stoichiometric defectiveness, linked to the quantitatively estimated contemporary presence of HPO42- and CO32- substituting PO43- and OH-, was attempted. (C) 2000 Published by Elsevier Science S.A. All rights reserved.
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收藏
页码：54 / 61
页数：8
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