Fe2O3-CaO-SiO2体系铁磁微晶玻璃的磁性及生物活性

制备了添加少量B₂O₃和P₂O₅后的Fe₂O₃-CaO-SiO₂体系铁磁微晶玻璃,并进行了微观结构分析、XRD分析、磁性检测以及生理模拟液的浸泡实验.实验结果表明,制备的微晶玻璃材料同时具备磁性和生物活性这两种重要性能.不经过核化处理在1 000℃晶化2 h后能够获得较理想的磁铁矿主晶相和硅灰石次晶相均匀致密分布的微观组织,所得微晶玻璃具有最佳的磁性能.铁含量提高能够增加微晶玻璃的磁性,然而会抑制微晶玻璃表面羟基磷灰石的形成,从而降低其生物活性.

The Magnetic Properties and Bioactivity of Ferromagnetic Glass-Ceramics in the System Fe2 O3-CaO-SiO2

Bioactive and ferromagnetic glass-ceramics are useful as thermoseeds for hyperthermia treatment of cancer.The ferromagnetic glass-ceramics in the system FeO-Fe₂O₃-CaO-SiO₂ have been prepared with the addition of a small amount of B₂O₃ and P₂O₅.The microstructure analysis, XRD, magnetometer test and soaking in simulated body fluid have been carried out in the study of the ferromagnetic glass-ceramics.The results show that the glass-ceramics have two important properties:magnetic properties and bioactivity.Better microstructure with the main crystal magnetite and secondary crystal wollastonite evenly distributed can be obtained through the optimal heat treatment carried out directly under 1 000℃ for two hours without nucleation, and the magnetic properties of the ferro-magnetic glass-ceramics thus made are the best in quality.With the increase of Fe content, the magnetic properties tend to increase.On the other hand, Fe can suppress the formation of the apatite on the surface of glass-ceramics.It is, therefore, necessary to carry out in-depth research to find the way to balance the effects of Fe.