孔隙率对钛合金生物医用材料耐蚀性的影响  

The influence of corrosion-resistance on biomedical porosity titanium alloys

作　　者：魏然[1] 邵慧萍[1] 林涛[1] 郭志猛[1] 

机构地区：[1]北京科技大学新材料技术研究院,北京100083

出　　处：《功能材料》2012年第B11期178-181,共4页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(50774010);教育部留学回国人员科研启动基金对本项目的大力支持

摘　　要：通过凝胶注模工艺制备不同孔隙率的多孔钛合金(Ti-17.5Mo),采用扫描电子显微镜、X射线衍射对多孔钛合金表面形貌和孔隙率的变化进行了分析。通过测量Ti-17.5Mo合金的极化曲线、交流阻抗,对其在模拟体液(SBF)中的耐腐蚀性进行了探讨研究。结果表明,随着固含量的增加,烧结后凝胶注模制备的坯体孔隙率随之降低,使得试样在模拟体液中的阻挡层容抗强度和阻抗强度增加。水基凝胶注模Ti-17.5Mo体系固含量可以达到35%,烧结后孔隙率可以降到42%,电化学耐蚀性最好。The porous titanium alloys containing molybdenum elements have prepared by gel-casting methods. The microstructure, the total porosity were investigated by electronic microscopy and X-ray diffraction. The corrosion behavior of the porous titanium alloys of Ti-17.5Mo in the simulated body fluids （SBF） were evaluated by a potentiodynamic polarization test and impedance plots. The results showed the corrosion resistance of the titanium alloy increased with the improvement of solid contents, the smaller the porosity, the better the thermal stability. The porosity after sintering reduced with the improvement of solid content, which made the capacitive reactance and impedance of barrier layer increase. It had an important meaning to improve the corrosion resistance. The solid contents of gel-casting of water base reached 35% ,and porosity reduced to 42% after sintering, the corrosion resistance of the titanium alloy would be the best

关 键 词：钛合金 凝胶注模 孔隙率 耐蚀性 

分 类 号：TG133.4[一般工业技术—材料科学与工程]