磷酸钙骨水泥的水化反应、凝结时间及抗压强度

HYDRATION REACTION, SETTING TIME AND COMPRESSIVE STRENGTH OF CALCIUM PHOSPHATE CEMENT

研究了磷酸钙骨水泥（ＣＰＣ）水化反应动力学及凝结时间和抗压强度的变化规律．结果表明：水化反应前期动力学由磷酸钙盐原料的表面溶解控制，４ｈ后由水分子通过产物层的扩散控制．根据凝结过程中浆体流变特性的变化，提出了ＣＰＣ凝结过程的物理本质，并提出了凝结时间的一个简化模型，指出了调节凝结时间的一些途径．研究了水化反应过程中抗压强度的变化规律及其与水化反应动力学、浆体微结构演变的关系。

Dynamics of hydration reaction, setting time and compressive strength of calcium phosphate cement are studied. At the initial stage of hydration reaction, the dynamics is controlled by the surface solution of raw powders; after 4h, the dynamics is controlled by diffusion of water through the initial products. The physical nature of setting process is put forward according to the rheological characteristic of the pastes, and a simple model about setting time of CPC is proposed, which points out some ways to adjust the setting time. The relation of the compressive strength, the dynamics of hydration reaction and the microstructure is discussed. The results show that controlling the microstructure of the paste is crucial for increasing the compressive strength of CPC.