水热温度对碳/碳复合材料表面HAp/壳聚糖生物复合涂层的影响

以声化学法合成的纳米羟基磷灰石(HAp)为起始原料,以异丙醇作为分散介质,采用水热电泳沉积法在经壳聚糖(CS)溶液改性后的碳/碳复合材料(C/C)表面沉积HAp/CS生物复合涂层.重点研究水热温度对复合涂层晶相、形貌的影响及涂层的沉积动力学机理.采用X射线衍射仪(XRD)、透射电子显微镜(TEM)、傅立叶变换红外光谱分析仪(FTIR)和扫描电子显微镜(SEM)对所制备的涂层进行表征.结果表明:随着水热温度的升高,涂层表面由微晶疏松结合的多孔结构向紧密结合的多孔结构转变,涂层的内聚力增强;涂层的沉积速率随水热温度的升高而增加,涂层的沉积活化能为43.58 kJ/mol.

Influence of Hydrothermal Temperature on the Hydroxyapatite/Chitosan Bio-coatings on Carbon/Carbon Composites

Hydroxyapatite/Chitosan (HAp/CS) bio-coatings were prepared by a novel hydrothermal electrophoretic deposition on CS modified carbon/carbon (C/C) composites in isopropyl alcohol, using sonochemical process resulted HAp nanoparticles as raw material. The influences of hydrothermal temperature on the phase, microstructures and the deposition kinetics of the coatings were investigated. The HAp/CS coatings were characterized by X-ray diffraction (XRD), transmission election microscopy (TEM), Fourier transform infrared (FTIR) spectrum and scanning electron microscope (SEM) analyses. Results showed that with the increase of hydrothermal temperature, the porous structure of the coatings changed from loose combination to close combination, and the cohesive force was enhanced. Kinetics investigations showed that the deposition rate also increased with the increase of hydrothermal temperature. The deposition activation energy of HAp/CS coatings by the hydrothermal electrophoresis deposition process was calculated to be 43.58 kJ/mol.