Abstract

In this study, the reduced graphene oxide (rGO)-Hydroxyapatite (HA) powders were first synthesized by a hydrothermal method. The amount of graphene in these powders was 1.5% by weight. Subsequently, these powders were consolidated at 900, 930, and 950 °C by spark plasma sintering (SPS) method, while the pressure applied in the process was 50 MPa. The sintered samples were characterized by X-ray diffraction, Raman spectroscopy, field emission scanning electron microscopy, high-resolution transmission electron microscopy, and Vickers indentation methods. The results of this study showed that increasing the sintering temperature increased the relative density of the samples. Mechanical properties such as elastic modulus and hardness increased with increasing sintering temperature. The results of the microscopic analysis confirmed the presence of rGO sheets in the final nanocomposites. According to the findings of this study, considering the applied conditions, the best temperature for sintering was 950° C.

摘要

在这项研究中，还原氧化石墨烯（rGO）-羟基磷灰石（HA）粉末首先通过水热法合成。这些粉末中石墨烯的量为 1.5%（重量）。随后，这些粉末通过放电等离子烧结 (SPS) 方法在 900、930 和 950 °C 下固结，同时该过程中施加的压力为 50 MPa。通过 X 射线衍射、拉曼光谱、场发射扫描电子显微镜、高分辨率透射电子显微镜和维氏压痕方法对烧结样品进行表征。这项研究的结果表明，提高烧结温度会增加样品的相对密度。机械性能如弹性模量和硬度随着烧结温度的升高而增加。显微分析的结果证实了最终纳米复合材料中存在 rGO 片。根据本研究结果，考虑到应用条件，最佳烧结温度为 950°C。