In this work, nanocomposites were prepared with different percentages of alumina (Al₂O₃) and carbonated hydroxyapatite (CHA) using the mechanical alloying method. Then, the effect of sintering temperatures, up to 1300 °C, on their structure, molecular structure, microstructure and mechanical properties was investigated using X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM) and ultrasonic techniques, respectively. Furthermore, the in vitro bioactivity of these nanocomposites was assessed by XRD and SEM. Moreover, physical and shrinkage measurements were performed for all sintered samples. The results obtained showed that increasing the sintering temperature to 1300 °C enhanced the hardness value, porosity content, and shrinkage of CHA-free sample from 12 to 14 GPa, 14 to 11% and 1.2 to 2.5%, respectively. However, at the same temperature, the sample with the highest CHA content showed a significant decrease in the hardness and porosity values from 9.3 to 8 GPa and from 8.5 to 6.5%, respectively. On the other hand, the shrinkage value of this sample increased from 8.8 to 16.5%. Finally, the increase in CHA contents was responsible for giving the sintered nanocomposites a good bioactivity behavior.

Graphic abstract

中文翻译：

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烧结工艺对氧化铝/羟基磷灰石纳米生物复合材料不同性能的影响

在这项工作中，制备了具有不同百分比的氧化铝（Al ₂ O ₃）和使用机械合金化方法的碳酸化羟基磷灰石（CHA）。然后，使用X射线衍射（XRD），傅立叶变换红外（FTIR）光谱，扫描电子显微镜（SEM）研究了高达1300°C的烧结温度对其结构，分子结构，微观结构和力学性能的影响。和超声波技术。此外，通过XRD和SEM评估了这些纳米复合材料的体外生物活性。此外，对所有烧结样品进行了物理和收缩测量。结果表明，将烧结温度提高到1300°C可以将无CHA样品的硬度值，孔隙率和收缩率分别提高12至14 GPa，14至11％和1.2至2.5％。但是，在相同温度下 CHA含量最高的样品的硬度和孔隙率值分别从9.3 GPa和8 GPa显着降低，从8.5至6.5％显着降低。另一方面，该样品的收缩率从8.8增加到16.5％。最后，CHA含量的增加是使烧结纳米复合材料具有良好生物活性的原因。

图形摘要