Calcium phosphate cements prepared by acid-base reaction
Calcium phosphate cements prepared by acid-base reaction
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酸碱反应制备磷酸钙骨水泥
DOI：
10.1111/j.1151-2916.1992.tb04468.x
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发表时间：
1992
影响因子：
3.9
通讯作者：
Janet M. Hill
中科院分区：
文献类型：
--
作者：
T. Sugama;M. Allan;Janet M. Hill
研究了以nh4h2po4为基础的肥料（Poly-N）与3CaO·Al2O3 （C3A）、CaO·Al2O3 （CA）和CaO·2Al2O3 （CA2）等铝酸钙化合物（CAC）通过放热酸碱反应制备的磷酸钙水泥（CPC）的特性，并对反应动力学、界面反应、原位相变和微观结构发展进行了一系列综合研究。比较两组未处理和水热处理的CPC标本。CAC与Poly-N在25℃时的反应活性大小依次为：CA > C3A > CA2。在此反应过程中，NH4CaPO4·xH2O盐的形成是CPC样品强度发展的原因。在300℃高温下，非晶态NH4CaPO4·xH2O在水泥体中发生原位相变，形成结晶Ca5(PO4)3(OH)，并形成水合Al2O3凝胶→γ-AIOOH。这种相变显著提高了机械强度。
We investigated the characteristics of calcium phosphate cements (CPC) prepared by an exothermic acid–base reaction between NH4H2PO4-based fertilizer (Poly-N) and calcium aluminate compounds (CAC), such as 3CaO · Al2O3 (C3A), CaO · Al2O3 (CA), and CaO · 2Al2O3 (CA2), in a series of integrated studies of reaction kinetics, interfacial reactions, in-situ phase transformations, and microstructure development. Two groups were compared: untreated and hydrothermally treated CPC specimens. The extent of reactivity of CAC with Poly-N at 25°C was in the following order: CA > C3A ≫ CA2. The formation of a NH4CaPO4·xH2O salt during this reaction was responsible for the development of strength in the CPC specimens. The in-situ phase transformation of amorphous NH4CaPO4·xH2O into crystalline Ca5(PO4)3(OH) and the conversion of hydrous Al2O3 gel →γ-AIOOH occur in cement bodies during exposure in an autoclave to temperatures up to 300°C. This phase transformation significantly improved mechanical strength.