硅酸钙及硅酸钠浓度对钛合金表面生物活性涂层的影响

Effects of calcium silicate and sodium silicate concentrations on bioactive coating on titanium alloy

使用微弧氧化技术,在恒压工作模式下,脉冲电压400 V,脉冲频率600 Hz,占空比15%,氧化时间10 min,电解液由CaSiO3,Na2SiO3·9H2O,EDTA-2Na和K2HPO4·3H2O组成,以不同浓度(0.0835-0.15 mol/L)的CaSiO3及不同浓度(0-0.06 mol/L)的Na2SiO3·9H2O,在3D打印基体钛片表面制备生物活性涂层。利用扫描电子显微镜、能谱仪、电化学工作站、涡流膜厚仪、Image-Pro Plus 6.0、轮廓仪、划痕仪等对涂层进行结构、性能及微观形貌表征,研究CaSiO3和Na2SiO3·9H2O浓度对涂层的影响。结果表明:随着CaSiO3浓度的增加,涂层厚度、粗糙度、微孔孔径及孔隙率、涂层钙磷元素比逐渐增大,耐腐蚀性能及膜基结合力变差;随着Na2SiO3·9H2O浓度的增加,涂层孔隙率及孔径先增大后减小,涂层厚度、粗糙度、涂层钙磷元素比逐渐增大,膜基结合效果和耐腐蚀性先变差后变好。当CaSiO3和Na2SiO3·9H2O的浓度分别为0.15 mol/L和0.015 mol/L时,涂层的性能最佳。

The bioactive coatings were prepared on the surface of Ti6Al4V by micro-arc oxidation in the electrolyte system consist of CaSiO3,Na2SiO3·9H2O,EDTA-2Na,K2HPO4·3H2O and the electrical parameters were fixed at 400 V,600 Hz,15%,10 min with constant voltage mode.The value of concentration of CaSiO3 and Na2SiO3·9 H2O were changed,and the range of change was 0.0835-0.15 mol/L and 0-0.06 mol/L respectively.Structural properties and microstructure of bioactive coating fabricated by micro-arc oxidation were detected by scanning electron microscopy(SEM),energy dispersive spectrometer(EDS),electrochemical workstation,eddy current thickness profiler,scratch tester and Image-Pro Plus 6.0.The effects of CaSiO3 and Na2SiO3·9H2O concentrations on the bioactive coating were studied.The results show that thickness,roughness,micropore diameter and porosity,calcium phosphate ratio gradually increase and corrosion resistance,bond strength gradually deteriorate with the increase of CaSiO3 concentration.Micropore diameter and porosity first grow larger and then become smaller,thickness,roughness,calcium phosphate ratio and bond strength gradually increase and corrosion resistance becomes better first and then deteriorates with the increase of Na2SiO3·9 H2O concentration.The performance of the coating is the best when the concentrations of calcium silicate and sodium silicate are 0.15 mol/L and 0.015 mol/L,respectively.