摘要
利用放电等离子烧结技术(spark plasma sintering,SPS)制备Ti-13Nb-13Zr(TNZ)生物医用合金,采用开路电位、动电位极化曲线、电化学阻抗谱和X射线光电子能谱等研究烧结温度对合金在Hank’s人工模拟体液中电化学腐蚀性能的影响,并与纯Ti(TA1)和Ti-6Al-4V(TC4)合金进行对比。结果表明:与TA1和TC4合金相比,SPS制备的TNZ合金具有较高的自然腐蚀电位Ecorr、较低的极化电流密度icorr以及较高的线性极化电阻Rp,并随烧结温度升高,耐腐蚀性能逐渐增强。该合金在模拟人工体液中耐腐蚀性能优异的主要原因是合金表面形成稳定、均匀且保护性更强的复合氧化物钝化膜,钝化膜由Ti O2,Nb2O5和Zr O2组成;随烧结温度升高,合金获得较高的致密度和近β型单相组织,耐腐蚀性能提高。
Biomedical Ti-13Nb-13Zr alloys were prepared by spark plasma sintering （SPS）. The effects of different sintering temperature on electrochemical corrosion properties were investigated in Hank＇s solution by open-circuit potential, potentiodynamic polarization, electrochemical impedance spectroscopy and X-ray photoelectron spectroscopy measurement. Pure Ti （TA1） and Ti-6A1-4V （TC4） alloys were also investigated to make a comparison. The results show that TNZ alloys have higher spontaneous corrosion potential （Ecorr） in thermodynamics of corrosion, lower polarization current density （icorr） and higher linear polarization resistance （Rp） in kinetics of corrosion compared with TA1 and TC4 alloys. The corrosion resistance of TNZ alloys is improved with increasing the sintering temperature. The main factors of the excellent corrosion resistance of TNZ alloys in simulated artificial body fluid are attributed to the stable, homogeneous and more protective passive film formed on the surface of alloy, which consists of TiO2, Nb205 and ZrO2. With the increase of the sintering temperature higher density, 13-type single phase microstructure and improved of corrosion resistance are obtained.
出处
《粉末冶金材料科学与工程》
北大核心
2017年第2期190-197,共8页
Materials Science and Engineering of Powder Metallurgy
基金
国家自然科学基金资助项目(31660262)
云南省教育厅科学研究基金资助项目(2016ZZX049)
云南省省院省校科技合作专项项目(2013IB006)
