电沉积羟基磷灰石/TiO_2复合涂层

Preparation of HA/TiO_ 2 Composite Coatings Through Electrodeposition

采用电沉积技术制备羟基磷灰石 (HA) /TiO2 复合涂层 ,比较了不同工艺条件对涂层中TiO2 含量的影响 ,测试了涂层的结合强度 ,探讨了结合强度和TiO2 含量的关系 ,实验结果表明 ,涂层中TiO2 的含量随电流密度的降低、电沉积时间的延长和电解液中TiO2 浓度的提高而增加 ,随主盐浓度的升高先增加后减小。结合强度随涂层中TiO2 含量的增加而提高 ,经烧结后涂层的结合强度显著提高 ,涂层中TiO2 质量分数为 72 2 %时 ,其结合强度可达 18 7MPa。复合涂层的耐腐蚀性较好 ,具有良好的化学稳定性和抗溶解性。当烧结温度高于 80 0℃时 ,TiO2 起催化作用促进HA分解 ,产生新相 β Ca3 (PO4) 2 和CaO。

Hydroxyapatite/titania(HA/TiO 2) composite coatings were obtained via electrodeposition. The influence of process technology on the content of TiO 2 in the coating and the influence of the content of TiO 2 in the coating on the bonding strength of the coating were investigated. The results revealed that the content of TiO 2 in the coating increased with reduction of the current density and prolonging of the deposition time and increase in the concentration of TiO 2 in the electrolyte, but increased first and decreased afterwards with increase in the electrolyte concentration. Calcination could improve the bonding strength up to 18.7 MPa, when the mass fraction of TiO 2 in the coating was 72.2%. The composite coatings have a fairly good chemical stability, erosive endurance and dissolvation resistibility. HA in the composite coatings is partly decomposed to β-Ca 3(PO 4) 2 and CaO when the calcination temperature in preparation above 800 ℃.