微弧氧化中不同浓度Na_2SiO_3溶液对钛-瓷结合强度的影响

目的:研究以不同浓度Na_2SiO_3溶液进行微弧氧化处理后对钛-瓷结合强度的影响,方法:在瓷粉烧结前,分别用3 种浓度的Na_2SiO_3溶液对纯钛片进行微弧氧化处理,瓷粉烧结后通过三点弯曲实验检测钛-瓷结合强度,并以扫描电镜(SEM)和能谱分析(EDS)对膜层表面及钛-瓷界面进行分析.结果:三点弯曲实验结果显示微弧氧化各组钛-瓷结合强度均高于对照组,当Na_2SiO_3溶液浓度为20 g/L时钛-瓷结合强度明显高于30 g/L组和40 g/L组(P<0.05).EDS分析显示经微弧氧化处理后,钛表面生成含Si元素氧化膜,其含量随溶液浓度增加而升高.扫描电镜显示,随着溶液浓度增加,氧化膜表面孔洞直径增加,氧化膜变厚,致密性下降;钛-瓷结合界面出现微小裂隙.结论:微弧氧化处理可提高钛-瓷结合强度,微弧氧化溶液浓度对钛-瓷结合强度有影响.

Effects of electrolyte's concentration at micro-arc oxide treatment on the bonding strength of titanium to porcelain

Objective; To evaluate the influence of electrolyte's concentration at micro-arc oxide treatment on the bonding strength of titanium to porcelain. Methods; CP titanium specimens with size of 25 mm ×3 mm ×0. 5 mm were treated with micro-arc oxidation (MAO) in Na_2SiO_3 solution of three different concentrations. After ultra-low-fusing porcelain was applied, a three-point-flexure-test was used to evaluate the bonding strength of titanium to porcelain. The surface of the specimens was observed by SEM and EDS, as well as the interface between titanium and porcelain. Results; The bonding strength values between titanium treated with MAO and porcelain was significantly higher then the control groups, Croup 20 g/L has the highest bonding strength values. SEM/EDS suggested that a porous thin layer of oxide which contains Si element is created by MAO, and higher concentration of Na_2SiO_3 leads to more Si element in oxide. Conclusion; MAO treating can improve the bonding strength between titanium and ceramic. Electrolyte's concentration has an effect on the bond strength between titanium and porcelain.