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.

引用

页码：54 / 61

页数：8