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陈兴虎,张俊敏,于泳泉,钏定泽,刘金坤,颜廷亭,陈庆华.SPS烧结Ti-25Ta-3Ag合金的组织演变与腐蚀行为研究[J].稀有金属材料与工程(英文),2020,49(11):3925~3931.[Chen Xinghu,Zhang Junmin,Yu Yongquan,Chuan Dingze,Liu Jinkun,Yan Tingting and Chen Qinghua.Microstructure Evolution and Corrosion Behavior of Ti-25Ta-3Ag Alloy via Spark Plasma Sintering[J].Rare Metal Materials and Engineering,2020,49(11):3925~3931.]
Microstructure Evolution and Corrosion Behavior of Ti-25Ta-3Ag Alloy via Spark Plasma Sintering
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Received:November 28, 2019  Revised:January 06, 2020
DOI:
Key words: titanium alloy  spark plasma sintering(SPS)  electrochemical corrosion
Foundation item:云南省大学生创新创业项目:“抗菌改性羟基磷灰石晶须的制备研究”,“PCL/PVA复合人造皮肤修复用材料的制备及应用基础研究”
Author NameAffiliation
Chen Xinghu,Zhang Junmin,Yu Yongquan,Chuan Dingze,Liu Jinkun,Yan Tingting and Chen Qinghua  
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Abstract:
      Biomedical Ti-25Ta-3Ag alloys were prepared via spark plasma sintering (SPS). The microstructure, morphology and phases of the alloy were characterized by XRD and SEM. The effects of sintering temperature on the electrochemical corrosion properties were investigated in artificial simulated body fluid (Hank"s solution) by open-circuit potential, potentiodynamic polarization and electrochemical impedance spectroscopy. The results show that there are α phase (irregular polygon), martensite α" phase (needle) and β phase (platelets) in the sinter of Ti-25Ta-3Ag, and the elemental Ag (white particle) precipitation at the grain boundary. Electrochemical experiments show that the corrosion resistance of the alloy is improved with the increasing of sintering temperature. The main factors of the excellent corrosion resistance of the alloy in artificial simulated body fluids was owing to Ag addition in the alloy which improves the corrosion potential as well as Ag precipitates at the grain boundary due to the high corrosion resistance of Ag, so that the grain boundary was less prone to corrosion. On the other hand, the passivation film formed on the surface of the alloy which consists of TiO2 and Ta2O5 oxides and low ionic oxides of Ti and Ta as well as metal Ag precipitations, the stability and protection of were enforced.