碳/碳复合材料表面阴极等离子体电解沉积硅掺杂羟基磷灰石涂层及其结构性能研究

Fabrication of silicon-doped hydroxyapatite coating on carbon/carbon composites by cathodic plasma electrolytic deposition and the study on its structure and properties

碳/碳(C/C)复合材料具有优异的生物力学性能,是制备硬组织植入体的理想材料,但其表面呈生物惰性,限制了其在生物医用领域的应用.对C/C复合材料进行表面改性,在其表面制备一层羟基磷灰石涂层,赋予其生物活性,可以有效解决这一问题.通过阴极等离子体电解沉积(CPED)技术,以含Ca、P、Si等元素的有机溶液为电解液,在C/C复合材料表面成功制备了Si掺杂羟基磷灰石涂层.实验结果发现,CPED涂层表面呈现粗糙的多级孔结构.能谱(EDS)结果表明,Si元素已被掺杂到CPED涂层中.FT-IR分析证明了硅酸根基团和碳酸根基团的存在,表明CPED涂层主要由B型羟基磷灰石构成.SBF浸泡实验表明,通过CPED工艺形成的Si掺杂涂层表现出优异的磷灰石诱导能力,表明C/C复合材料的生物活性得到显着提高.成骨细胞培养实验结果表明,CPED涂层具有良好的生物相容性.

Carbon/carbon(C/C)composite has excellent biomechanical properties and is an ideal material for hard tissue implants,but its surface is biologically inert,which limits its further application in the biomedical field.This problem can be effectively solved by preparing a layer of hydroxyapatite coating on the surface of the C/C composite material to give it biological activity.This work successfully prepared a Si-doped hydroxyapatite coating on C/C composite materials by cathodic plasma electrolytic deposition(CPED)technology using an organic solution containing Ca,P,Si and other elements as electrolytes.The experimental results found that the surface of the CPED coating showed a rough hierarchical pore structure.The energy spectrum(EDS)results showed that Si had been doped into the CPED coating.FT-IR analysis proved the existence of silicate groups and carbonate groups,indicating that the CPED coating is mainly composed of B-type hydroxyapatite.The SBF immersion test showed that the Si-doped coating formed by the CPED process showed excellent apatite inducing ability,indicating that the biological activity of the C/C composite was significantly improved.The results of osteoblast culture experiments show that CPED coating has good biocompatibility.