Influence of Mg-doping, calcium pyrophosphate impurities and cooling rate on the allotropic α⇆β-tricalcium phosphate phase transformations

被引：54

作者：

Torres, P. M. C. ^{[1
]}

Abrantes, J. C. C. ^{[1
,2
]}

Kaushal, A. ^{[1
]}

Pina, S. ^{[1
]}

Doebelin, N. ^{[3
]}

Bohner, M. ^{[3
]}

Ferreira, J. M. F. ^{[1
]}

机构：

[1] Univ Aveiro, CICECO, Dept Mat & Ceram Engn, P-3810193 Aveiro, Portugal

[2] Polytech Inst Viana do Castelo, ESTG, UIDM, P-4900 Viana Do Castelo, Portugal

[3] RMS Fdn, CH-2544 Bettlach, Switzerland

来源：

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2016年 / 36卷 / 03期

关键词：

Tricalcium phosphate; Calcium pyrophosphate; Mg substitution; Phase transition; Thermal stability; BETA-TRICALCIUM PHOSPHATE; ALPHA-TRICALCIUM; SETTING REACTION; HIGH-TEMPERATURE; BONE; SYSTEM; TCP; CRYSTALLINITY; SUBSTITUTION; DIFFRACTION;

D O I：

10.1016/j.jeurceramsoc.2015.09.037

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

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.

引用

页码：817 / 827

页数：11

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