Nano-ceramic particles can serve as reinforcing agents for metallic materials to improve their mechanical properties. However, it is important to ensure chemical compatibility between the matrix and particles. In the present study, magnesium composites with and without nano-hydroxyapatite (nHA) particles were fabricated for bone reconstruction applications. Two different techniques were used, Conventional Sintering (CS) of powder compacts and Spark Plasma Sintering (SPS) of pre-compacted powder. Results showed that a 10 wt% addition of nHA particles to magnesium, followed by SPS improved the compression strength by 27%. CS did not lead to any significant improvement compared to SPS processing. X-ray diffraction data after CS revealed the formation of unfavorable phases due to chemical reactions between nHA particles and the magnesium matrix, while these phases were absent after SPS processing. The mechanical properties of the specimens fabricated by CS were much inferior to those processed using SPS. The shorter processing time associated with SPS leaded to reduced interaction between nHA particles and the Mg-matrix, compared to CS.

中文翻译：

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镁/纳米羟基磷灰石复合材料的骨重建：加工方法的影响

纳米陶瓷颗粒可以用作金属材料的增强剂，以改善其机械性能。但是，重要的是要确保基质和颗粒之间的化学相容性。在本研究中，制备具有和不具有纳米羟基磷灰石（nHA）颗粒的镁复合材料，用于骨骼重建应用。使用了两种不同的技术：粉末压块的常规烧结（CS）和预压实粉末的火花等离子体烧结（SPS）。结果表明，向镁中添加10 wt％的nHA颗粒，然后进行SPS可使抗压强度提高27％。与SPS处理相比，CS并未带来任何重大改进。CS后的X射线衍射数据显示，由于nHA颗粒与镁基质之间的化学反应，形成了不利的相，而在SPS处理之后，这些阶段就不存在了。CS制造的样品的机械性能远不如使用SPS加工的样品。与CS相比，与SPS相关的处理时间较短，导致nHA颗粒与Mg基质之间的相互作用降低。