Effects of powder stoichiometry on the sintering of β-tricalcium phosphate
Effects of powder stoichiometry on the sintering of β-tricalcium phosphate
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DOI：
10.1016/j.jeurceramsoc.2006.09.005
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发表时间：
2007-01-01
影响因子：
5.7
通讯作者：
Leriche, A.
中科院分区：
文献类型：
--
作者：
Descamps, M.;Hornez, J. C.;Leriche, A.
研究了弱化学计量变化对β-TCP烧结行为的影响。以磷酸二铵和硝酸钙为原料，采用化学沉淀法制备了β-磷酸三钙（β-TCP）粉体。硝酸盐的过量或不足导致Ca/P比低于或高于1.5的组合物。这些粉末在各种温度（800-950 ℃）下煅烧，通过粉浆浇铸工艺成型并在1100 ℃下烧结。采用SEM、XRD等手段对粉末和烧结体的显微结构、物相组成、比表面积和密度进行了分析。FTIR，BET，该研究表明，焦磷酸钙或羟基磷灰石相的存在显著影响β-TCP粉末的物理特性，特别是比表面积，从而影响它们的烧结性。合成后的TCP化学组成允许调整原料粉末的煅烧温度，以获得最大的致密化。紧凑型。在这项工作中还显示了β-TCP粉末中少量HA相对其烧结性的有益作用。(c)2006爱思唯尔有限公司保留所有权利。
The impact of weak stoichiometry variations on beta-TCP sintering behaviour was studied. beta-Tricalcium phosphate (beta-TCP) powders were synthesised by chemical precipitation through aqueous solution of diammonium phosphate and calcium nitrate. Excess or deficiency of nitrate salt leads to compositions with Ca/P ratios below or over 1.5. These powders, calcined at various temperatures (800-950 degrees C), were shaped by slip casting process and sintered at 1100 degrees C. The microstructure, phase composition, specific surface area and density of powders and sintered compacts were analysed by SEM, XRD. FTIR, BET, Archimedes methods and dilatometry.This study shows that the presence of calcium pyrophosphate or the hydroxyapatite phases affects considerably the physical characteristics of the beta-TCP powders and in particular specific surface area and consequently their sinterability.A precise determination of the beta-TCP chemical composition after synthesis allows to adapt the calcination temperature of the raw powder in order to obtain a maximum densification of the compact. The beneficial role of small quantity of HA phase inside beta-TCP powder on their sinterability was also shown in this work. (c) 2006 Elsevier Ltd. All rights reserved.