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Jose M. Calderon Moreno,Monica Popa,Steliana Ivanescu,Cora Vasilescu,Silviu Iulian Drob,Elena Ionela Neacsu,Mihai V. Popa 대한금속·재료학회 2014 METALS AND MATERIALS International Vol.20 No.1
The corrosion behavior of a new, advanced Ti-20Zr alloy with α+β microstructure (determined by opticalmicroscopy, XRD, and SEM) and very good mechanical properties (obtained from the stress-strain curve)is studied in this paper. The composition of the alloy native passive film was determined from a XPS analy-sis and the long-term corrosion resistance in undoped and doped states with 0.05M NaF artificial Carter-Brugi-rard saliva of different pH values, simulating the severe functional conditions of a dental implant, was analyzed byelectrochemical methods. This alloy possesses an advantageous balance between good mechanical resis-tance and plasticity and Young’s modulus and exhibits more favorable electrochemical parameters and cor-rosion resistance than CP Ti due to its more resistant passive layer containing Ti2O3, TiO2, and ZrO2 protectiveoxides. After 1000 h of immersion in saliva, the protective properties of the alloy were enhanced due tothe deposited surface layer that incorporated protective phosphates (shown by SEM and XPS).
Monica Popa,Ecaterina Vasilescu,Paula Drob,Doina Raducanu,Jose Maria Calderon Moreno,Steliana Ivanescu,Cora Vasilescu,Silviu Iulian Drob 대한금속·재료학회 2012 METALS AND MATERIALS International Vol.18 No.4
For an alloy to be suitable for use as an implant material, it must have a low specific weight and Young’s modulus, good mechanical properties that are similar to those of bone, and very good corrosion resistance and biocompatibility. In this study, we have developed a novel Ti-20Nb-10Zr-5Ta alloy that is composed of nontoxic, nonallergenic, corrosion-resistant elements. This alloy has low specific weight and Young’s modulus and good mechanical properties. It has a fine microstructure with a matrix that is mainly composed of the β phase and some α phase due to recrystallization during cooling. It shows elastoplastic behavior with a fairly linear elastic behavior and low Young’s modulus (59 GPa). In addition, its ultimate tensile strength, 0.2% yield strength, and hardness are higher than those of CP Ti, commercial Ti-6Al-4V,and similar β-type alloys. It exhibited a very stable passive state and its electrochemical parameters and corrosion and ion release rates were better than those of CP Ti in Ringer’s solutions of different pH values that simulate the severe functional conditions of an implant; this is attributable to the beneficial influence of the alloying elements and to the better protective properties of the coated passive film.
Cora Vasilescu,Silviu Iulian Drob,Petre Osiceanu,Paula Drob,Jose Maria Calderon Moreno1,Silviu Preda,Steliana Ivanescu,Ecaterina Vasilescu 대한금속·재료학회 2015 METALS AND MATERIALS International Vol.21 No.2
This paper describes the synthesis of a novel Ti-15Ta-5Zr alloy with an + β stable, homogeneous, biphasicmicrostructure (by optical microscopy, X-ray diffraction and scanning electron microscopy) and the determinationof its mechanical properties, hardness and a Young’s modulus of 42.2 GPa. The alloy passive film compositionand thickness were analyzed by X-ray photoelectron spectroscopy; a thick, compact native passive filmcontaining the protective oxides of all constituent elements (TiO2, Ta2O5, ZrO2) was identified. The electrochemicalparameters confirmed a nobler behaviour and a more capacitive, resistant passive film on thealloy surface compared to Ti and other existing implant alloys; these facts are due to the alloying elements that,by their oxides stabilize and reinforce the alloy passive film. This passive film thickened in time, which increased itsprotective capacity. The new alloy had no susceptibility to galvanic or local corrosion. Ti-15Ta-5Zr alloyis recommended as an advanced orthopaedic implant material.