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首页> 外文期刊>CERAMICS INTERNATIONAL >A Na and Si co-substituted carbonated hydroxyapatite coating for carbon nanotubes coated carbon/carbon composites
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A Na and Si co-substituted carbonated hydroxyapatite coating for carbon nanotubes coated carbon/carbon composites

机译：用于碳纳米管涂覆的碳/碳复合材料的Na和Si共取代碳酸盐羟基磷灰石涂层

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摘要

A Na and Si co-substituted carbonated hydroxyapatite (NaSiCH) coating was applied on carbon nanotubes coated carbon/carbon composites using an ultrasound-assisted electrochemical deposition (UED) method. The morphology and microstructure of the coating were characterized by scanning electron microscopy, energy dispersive X-ray spectroscopy, Fourier transform infrared spectroscopy, Raman spectroscopy, X-ray diffraction and X-ray photoelectron spectroscopy. The in vitro bioactivity of the coating was investigated by examining the ability of apatite formation on its surface in simulated body fluid (SBF). The results showed that the carbon nanotubes coated carbon/carbon composites could provide a porous surface structure for the deposition of NaSiCH. After the UED process, the Na could replace Ca in the structure of hydroxyapatite. The Si could enter into the hydroxyapatite structure in the form of SiO_4~(4-) groups that are combined with the CO_3~(2-) to substitute the PO_4~(3-) groups. The NaSiCH coating was successfully applied on carbon nanotubes coated carbon/carbon composites. The NaSiCH crystals first enwrapped the carbon nanotubes and then infiltrated into the porous structure of the carbon nanotubes. Finally the NaSiCH coating formed a homogeneous coverage, exhibiting a belt shape with a width of 150-350 nm and a thickness less than 50 nm. The SBF tests showed that the NaSiCH coating could induce the formation of a uniform apatite layer with a wavy shape. In conclusion, NaSiCH offers great potential as a coating material for future medical application.
机译：使用超声辅助电化学沉积（UED）方法将Na和Si共取代的碳酸羟基磷灰石（NaSiCH）涂层施加到碳纳米管涂层的碳/碳复合材料上。通过扫描电子显微镜，能量色散X射线光谱，傅立叶变换红外光谱，拉曼光谱，X射线衍射和X射线光电子能谱对涂层的形貌和微观结构进行表征。通过检查模拟体液（SBF）中磷灰石在其表面形成的能力，研究了涂层的体外生物活性。结果表明，碳纳米管包覆的碳/碳复合材料可以为NaSiCH的沉积提供多孔表面结构。 UED处理后，Na可以取代羟基磷灰石结构中的Ca。 Si可以以SiO_4〜（4-）基团的形式进入羟基磷灰石结构，并与CO_3〜（2-）结合取代PO_4〜（3-）基团。 NaSiCH涂层已成功应用于碳纳米管涂层的碳/碳复合材料。 NaSiCH晶体首先包裹碳纳米管，然后渗透到碳纳米管的多孔结构中。最终，NaSiCH涂层形成均匀的覆盖，呈现出带状，宽度为150-350nm，厚度小于50nm。 SBF测试表明，NaSiCH涂层可以诱导形成波浪形的均匀磷灰石层。总而言之，NaSiCH作为涂层材料在未来的医学应用中具有巨大的潜力。

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