低温烧结生物微晶玻璃的研究
发布时间：2018-11-13 09:27
【摘要】：生物活性微晶玻璃被认为是可应用在骨修复领域良好的生物材料,研究热点主要集中于Ceravital生物活性微晶玻璃、A-W生物活性微晶玻璃和Bioverit可切削生物活性微晶玻璃。这些微晶玻璃烧结温度高,不适宜采用快速成型工艺,因此研究和制备具有低烧结温度的新型玻璃体系的生物活性材料具有重要的现实意义。实验构建Na2O-B2O3-SiO2-CaO-P2O5-F体系,通过调整配方组成,采用烧结法制备具有低温烧结、低温析晶性能的生物活性微晶玻璃材料,讨论材料的烧结与析晶的匹配性。研究表明引入P2O5的原料不同,获得的氟磷灰石形貌不同,采用CaHPO4·2H2O时能获得尺寸细小的晶体,氟磷灰石呈针状;通过对分相区内外不同组成点的研究发现,玻璃中均析出氟磷灰石,但晶体形貌不同,分相区内的组成中氟磷灰石呈针状,分相区外的组成中氟磷灰石呈球状或短棒状,且分相区内组成的析晶活化能远小于分相区外的组成,较易析晶;对于分相区内的组成,玻璃体系很容易发生分相,分相形貌为贯通的网络结构,尺寸在纳米级,其形貌随氟磷灰石的生长方向向径向延伸;分相区内的组成随CaO、P2O5添加量增大,材料的结晶度增大,样品的烧结性能与结晶度变化相匹配,在800℃热处理,P2O5含量为24wt%时样品的结晶度最大,显气孔率降至3.51%,体积密度达到2.54g/cm3,抗弯强度和弹性模量分别为65.26MPa、4.18GPa;随热处理温度的提高,样品的结晶度先增大后减小,在800℃时达到82.76%,此时各组样品都能获得良好的烧结效果,显气孔率低于5%,体积密度达2.3g/cm3以上,显微硬度在400HV以上,抗弯强度和弹性模量分别达到55MPa、4GPa以上;模拟体液浸泡实验证明样品表面有富含Ca、P元素的物质生成,证明实验制备的微晶玻璃具有一定的生物活性。
[Abstract]:Bioactive glass-ceramics are considered to be good biomaterials in the field of bone repair. The research focuses on Ceravital bioactive glass-ceramics, A-W bioactive glass-ceramics and Bioverit bioactive glass-ceramics. These glass-ceramics are not suitable for rapid prototyping because of their high sintering temperature. Therefore, it is of great practical significance to study and prepare new type glass active materials with low sintering temperature. The Na2O-B2O3-SiO2-CaO-P2O5-F system was constructed experimentally. The bioactive glass-ceramics with low temperature sintering and low temperature crystallization properties were prepared by adjusting the composition of the formula. The matching between sintering and crystallization of the materials was discussed. The results show that the morphology of fluoroapatite is different with the introduction of P2O5. The fine crystal can be obtained by using CaHPO4 2H2O, and the fluorapatite is needle-like. Through the study of the different composition points inside and outside the phase separation zone, it is found that fluoroapatite is precipitated in glass, but the morphology of the crystal is different. The fluoroapatite in the phase separation zone is acicular, and the fluoroapatite outside the phase separation zone is spherical or short rod. The activation energy of crystallization in the phase separation region is much smaller than that outside the phase separation zone, and it is easy to crystallize. For the composition of the phase separation region, the glass system is prone to phase separation. The morphology of the glass system is a penetrating network structure and its size is in the nanometer level. The morphology of the glass system extends radial with the growth direction of fluorophosphatite. The composition of the phase separation zone increases with the increase of CaO,P2O5 content, the crystallinity of the material increases, and the sintering properties of the samples match the change of crystallinity. The crystallinity of the samples is maximum when the content of P2O5 is 24wt%, and the apparent porosity decreases to 3.51% at 800 鈩，
本文编号：2328689
[Abstract]:Bioactive glass-ceramics are considered to be good biomaterials in the field of bone repair. The research focuses on Ceravital bioactive glass-ceramics, A-W bioactive glass-ceramics and Bioverit bioactive glass-ceramics. These glass-ceramics are not suitable for rapid prototyping because of their high sintering temperature. Therefore, it is of great practical significance to study and prepare new type glass active materials with low sintering temperature. The Na2O-B2O3-SiO2-CaO-P2O5-F system was constructed experimentally. The bioactive glass-ceramics with low temperature sintering and low temperature crystallization properties were prepared by adjusting the composition of the formula. The matching between sintering and crystallization of the materials was discussed. The results show that the morphology of fluoroapatite is different with the introduction of P2O5. The fine crystal can be obtained by using CaHPO4 2H2O, and the fluorapatite is needle-like. Through the study of the different composition points inside and outside the phase separation zone, it is found that fluoroapatite is precipitated in glass, but the morphology of the crystal is different. The fluoroapatite in the phase separation zone is acicular, and the fluoroapatite outside the phase separation zone is spherical or short rod. The activation energy of crystallization in the phase separation region is much smaller than that outside the phase separation zone, and it is easy to crystallize. For the composition of the phase separation region, the glass system is prone to phase separation. The morphology of the glass system is a penetrating network structure and its size is in the nanometer level. The morphology of the glass system extends radial with the growth direction of fluorophosphatite. The composition of the phase separation zone increases with the increase of CaO,P2O5 content, the crystallinity of the material increases, and the sintering properties of the samples match the change of crystallinity. The crystallinity of the samples is maximum when the content of P2O5 is 24wt%, and the apparent porosity decreases to 3.51% at 800 鈩，
本文编号：2328689
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