论文部分内容阅读
研究了磷酸钙骨水泥水化硬化过程的交流阻抗行为．结果表明：不同水化时间样品的交流阻抗谱在低频区是相互平行的，与实轴的交点值先增大，水化４ｈ后开始减少，表明在水化开始阶段由于水化产物的形成而使Ｐ·ｒ０（孔隙率与平均孔径的乘积）值减小，４ｈ以后，随着水化的进行，Ｐ·ｒ０值不但不降低，反而有所升高．实验结果还表明：固液比越大，交流阻抗谱直线同实轴的交点值越大；不同颗粒配比的样品其阻抗谱有所不同，水化２４ｈ后，小颗粒配比的样品的Ｐ·ｒ０值最小，而大颗粒配比的样品的Ｐ·ｒ０值最大；固化液质量分数对交流阻抗谱影响很大，其阻抗谱由孔中溶液浓度和Ｐ·ｒ０值共同决定；晶种的质量分数不同，交流阻抗谱的变化规律也不同，同时随水化时间的进行，阻抗谱也会发生变化．
The AC impedance behavior of calcium phosphate cement during hydration and hardening was studied. The results show that the AC impedance spectra of samples with different hydration time are parallel to each other in the low frequency region, and the intersection with the real axis first increases, and then decreases after hydration for 4 h, indicating that at the beginning of hydration, due to the formation of hydration products P r0 (the product of the porosity and the average pore diameter) is decreased. After 4 h, the value of P r0 not only does not decrease but increases as the hydration progresses. The experimental results also show that the larger the solid-liquid ratio, the larger the intersection of the line of the AC impedance spectrum and the real axis. The impedance spectra of samples with different particle ratios are different. After 24h of hydration, the P · The value of r0 is the smallest, while the value of P · r0 is the largest for samples with large particle size. The mass fraction of curing solution has a great influence on the AC impedance spectrum. The impedance spectrum is determined by the solution concentration in the pores and the value of P · r0. The mass fraction is different, the change rule of AC impedance spectrum is also different, at the same time with the hydration time, the impedance spectrum will also change.