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为了制得表面多孔且与基材结合强度高的羟基磷灰石(HA)涂层,实验中以正丁醇为分散介质,以SiO2粉末为添加剂,纯钛片为基材,电泳沉积制备羟基磷灰石/二氧化硅/壳聚糖/(HA/SiO2/CS)复合涂层,经后续热处理得到多孔HA/SiO2复合涂层,采用扫描电镜(SEM)、傅立叶红外光谱仪(FT-IR)、X射线衍射仪(XRD)、万能材料试验机对涂层的表面形貌、组成、结构和结合强度进行测试和表征,并通过模拟体液(SBF)浸泡法对复合涂层的生物活性进行评价.结果表明:当悬浮液中的HA/SiO2/CS质量比为1∶1∶1时,制得的HA/SiO2/CS涂层经700℃热处理后获得的HA/SiO2复合涂层孔洞分布均匀,大孔孔径在10～15μm,小孔孔径在1～5μm;涂层与基材的结合强度达到25.5 MPa;多孔HA/SiO2复合涂层在SBF中浸泡7 d后,涂层表面碳磷灰石化;说明实验中添加SiO2所制得的多孔HA/SiO2复合涂层与钛基材结合强度高,且具有良好的生物活性.
In order to obtain hydroxyapatite (HA) coating with porous surface and high bonding strength with substrate, n-butanol was used as dispersion medium, SiO2 powder as additive and pure titanium as substrate, electrophoretic deposition was used to prepare hydroxy (HA / SiO2 / CS) composite coatings were prepared and the porous HA / SiO2 composite coatings were obtained by subsequent heat treatment. The surface morphology of the composite coatings was characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR) , Surface morphology, composition, structure and bonding strength of the coating were tested and characterized by X-ray diffraction (XRD) and universal testing machine. The bioactivity of the composite coating was evaluated by SBF soaking The results show that the HA / SiO2 / CS coating prepared by heat treatment at 700 ℃ has a uniform pore distribution when the mass ratio of HA / SiO2 / CS in suspension is 1: 1: 1 , The hole diameter of 10 ~ 15μm, the hole diameter of 1 ~ 5μm; the bonding strength of the coating and the substrate reached 25.5 MPa; After soaking the porous HA / SiO2 composite coating in SBF for 7 days, Petrochemical. It shows that the porous HA / SiO2 composite coating prepared by adding SiO2 in the experiment has high bonding strength with titanium substrate and has good biological Sex.