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A multi-technique approach to characterize bioactive silicate composites

机译：一种拟合生物活性硅酸盐复合材料的多技术方法

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In the present work the ternary SiO_2·CaO·P_2O_5 composite, which differ in the Ca/P molar ratio, were synthesized by means of a sol-gel route. In order to investigate the influence of the relative amount of each phase the thermal properties of the synthesized gel-glass materials were studied as a function of the Ca/P molar ratio using thermogravimetric and differential thermal analysis (TG/DTA). After dehydration (in a single step), described from a kinetic point of view as a simple water evaporation without rupture of chemical bonds, all gels undergo a complex multi-step decomposition with endo and exothermic effects, followed by crystallization of calcium silicate phases at about 950°C. Furthermore, Fourier Transform Infrared Spectroscopy (FTIR), X-ray diffraction (XRD) and Scanning Electron Microscopy, coupled with energy dispersive spectroscopy (SEM/EDS), allowed us to detect the chemical modifications induced by modifying the Ca/P molar ratio and the sintering. This process is obtained by thermal treatment of the materials after analyzing their thermal behavior in the temperature range 600-1000°C, with the aim of making them suitable for their applications. The results revealed that when temperature is up to 900°C, crystallization occurs and pseudowollastonite and wollastonite were formed. Finally, the amount of pseudowollastonite decreased with increasing the sintering temperature, while that of wollastonite increased.
机译：在本工作中，通过溶胶 - 凝胶途径合成了Ca / P摩尔比的三元SiO_2·CaO·P_2O_5复合材料。为了研究合成凝胶的玻璃材料的热性质进行了研究作为使用将Ca / P摩尔比的函数中的每个相的相对量的影响热重与差热分析（​​TG / DTA）。在脱水之后（在单一步骤中）之后，从动力学的角度描述为简单的水蒸发而没有化学键破裂，所有凝胶都经过复杂的多步分解，其与内部和放热作用进行了复杂的多步分解，然后在硅酸钙阶段结晶大约950°C。此外，傅里叶变换红外光谱（FTIR），X射线衍射（XRD）和扫描电子显微镜，与能量分散谱（SEM / EDS）相结合，使我们能够检测通过改变Ca / P摩尔比和的化学修饰烧结。通过在600-1000℃的温度范围内的热行为后热处理，通过热处理来获得该方法，其目的是使它们适合于其应用。结果表明，当温度高达900℃时，发生结晶，形成伪动岩和硅灰石。最后，随着烧结温度的增加，伪动系岩的量减少，而硅灰石的含量增加。

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