Design and processing of near-β Ti–Nb–Ag alloy with low elastic modulus and enhanced corrosion resistance for orthopedic implants

Hussein, M.A.; Azeem, M.A.; Kumar, A. Madhan; Sankaran, Saravanan; Ankah, N.K.; Sorour, Ahmad A.

doi:10.1016/j.jmrt.2023.03.003

Cited by 17 publications

(4 citation statements)

References 77 publications

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“…Following this investigation, two R-CPE element ECMs ( R s (CPE dl ( R ct (CPE f R f )))) were implemented to simulate the measured EIS data of the CuNi-coated SS specimens, as shown in Figure b. Here, the time constant at higher frequencies is accompanied by the R ct and the double-layer capacitance ( C dl ) of the electrochemical reactions at the passive film/electrolytic interface, whereas the time constant at a lower frequency (CPE f R f ) is due to the passive film. , The simulated data agreed well with the experimentally obtained results and the values of chi-squared (χ 2 ) (10 –4 ∼ 10 –5 ), suggesting that the two nominated ECMs evidently replicate the definite electrochemical reactions taking place on the investigated SS specimens in the PEM-FC simulated conditions Table summarizes the EIS circuit values obtained from the ECM fitting analysis.…”

Section: Resultssupporting

confidence: 80%

“…35,36 The simulated data agreed well with the experimentally obtained results and the values of chi-squared (χ 2 ) (10 −4 ∼ 10 −5 ), suggesting that the two nominated ECMs evidently replicate the definite electrochemical reactions taking place on the investigated SS specimens in the PEM-FC simulated conditions. 37 Table 3 summarizes the EIS circuit values obtained from the ECM fitting analysis. The comparison of the CPE dl and R ct values in various environments (OCP, anode, and cathode) indicates that the coated SS304 had higher corrosion resistance at each potential.…”

Section: Electrochemical Corrosion Test Onmentioning

confidence: 99%

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Bimetallic CuNi Alloy Coatings on SS304 Substrate for Bipolar Plates of Proton Exchange Membrane Fuel Cells

Kumar,

Ehsan,

Suleiman

et al. 2024

ACS Appl. Energy Mater.

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The corrosion of metallic bipolar plates deteriorates the productivity and life cycle of proton exchange membrane fuel cells (PEM-FCs). Thus, the development of a high-performance protective coating that does not compromise the conductivity is crucial. In this study, bimetallic CuNi alloy coatings were directly grown on SS304 specimens by using chemical vapor deposition. The deposition period was periodically changed from 1 to 3 h to produce CuNi alloy coatings with varying structural characteristics. The detailed characterization indicated that the fabricated CuNi alloy coatings were homogeneous, dense, and crack-free with a thickness range of 1−2 μm. Further, the corrosion-resistant performance of CuNi-coated SS304 specimens was investigated in a PEM-FC operating simulated environment, and the results indicated that CuNi coatings developed for 3 h demonstrated the strongest surface protective activity with the lowest corrosion current density (0.125 μA cm 2 ) and highest impedance values (92567 Ω cm 2 ) in both PEM-FC operating cathode and anode conditions. The deposition of CuNi alloy films significantly reduced the interfacial contact resistance (ICR), and the CuNi-3h coating achieved a low ICR of 5 mΩ cm 2 under a compaction force of 150 N cm −2 . Detailed electrochemical characterization confirmed that the CuNi alloy coating has significant potential for use as a protective coating for PEM-FC SS bipolar plates.

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Section: Resultssupporting

confidence: 80%

Section: Electrochemical Corrosion Test Onmentioning

confidence: 99%

Bimetallic CuNi Alloy Coatings on SS304 Substrate for Bipolar Plates of Proton Exchange Membrane Fuel Cells

Kumar,

Ehsan,

Suleiman

et al. 2024

ACS Appl. Energy Mater.

Self Cite

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“…In Figure 2c is presented the results of Ti-40Nb. It was observed the same tendence that it was observed in 15 and 25 Nb and the found results are in accordance with literature 28 . However, it may be explained by other mechanism since the 40Nb did not present α phase.…”

Section: Ti-15nbsupporting

confidence: 92%

Wear Behavior of Ti-xNb Biomedical Alloys by Ball Cratering

Mattos,

Kuroda,

Rossi

et al. 2024

Mat. Res.

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Ti alloys have been developing through the years, aiming the biomedical application since it has suitable properties. Among Ti alloys, the Ti-Nb systems are a pronounced group to biomedical applications due to its low elastic modulus, good corrosion resistance, and mechanical properties. Although this system is quite well-known regarding its phases, structure and properties, there is not plenty of information about wear available in the literature. To investigate the wear resistance, the samples were submitted to x-ray diffraction (XRD) and scanning electron microscopy (SEM) to analyze the phases formed. Hardness and elastic modulus were measured by microhardness Vickers and dynamic Young modulus by excitation impulse. Additionally, wear volume, wear resistance, and H/E ratio were calculated to understand the wear material's performance. This study aims to investigate the wear resistance of Ti-xNb (x = 15, 25 and 40wt.%), one of each type of Ti alloys and phases formed: Ti-15Nb (α´), Ti-25Nb (α") and Ti-40Nb (β) and the influence of cooling rate after solution heat treatment on wear properties through ball cratering. It was possible to find that the harder the alloy, the higher the wear resistance. Thus, in the case of Ti-xNb (x = 15, 25 and 40wt.%), alloys the hardness plays a significant role in wear resistance. Besides that, the samples that have presented the α´ or α"phase have the lowest wear resistance. Therefore, not only the hardness influences the wear resistance but also the combination of phases formed.

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“…Niobium is a β stabilizer, so that the amount of niobium can be adjusted to produce (α+β) or β type alloys 9,11,12 . By adding Nb, Ti alloys with higher corrosion resistance [13][14][15] , lower Young's modulus 9,14,16 and even superelasticity and shape memory properties 17,18 can be achieved.…”

Section: Introductionmentioning

confidence: 99%

Powder Metallurgical Manufacturing of Ti-Nb alloys Using Coarse Nb Powders

Santos,

Signor,

Schneider

et al. 2024

Mat. Res.

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Powder metallurgy is an attractive method for cost effective production of near net shape Ti-Nb alloys, and, when elemental powders and coarse HDH powders are used, a higher flexibility in alloy composition and low processing costs can be achieved. In this study, manufacturing of (α+β) Ti-Nb alloys by powder metallurgical techniques using coarse HDH Nb (D 50 = 110 μm and D 50 = 255 μm) and HDH Ti (D 50 = 22.6 μm) powders as starting materials was described. Tape casting was applied for the production of porous sheets while warm compaction of Metal Injection Molding (MIM) feedstock was applied for the production of dense parts. Microstructural and mechanical tests were employed to investigated the effect of coarse Nb powders on the sintering behavior and mechanical properties. Tape casting enabled to produce porous sheets of Ti16Nb alloy with an interconnected porosity varying from 14 -31 vol.%. Warm compaction enabled to produce Ti-Nb parts with less than 2% porosity and Yield strength in compression of 975-1100 MPa, which is similar to the values reported for Ti-Nb based alloys produced by powder metallurgy of finer powders. A dynamic Young's Modulus of 37-52 GPa, significantly lower than that of cp-Ti was achieved. These results might provide guidelines for the use of coarse Nb powders as starting materials for the powder metallurgical development of low-cost Ti-Nb based alloys.

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Design and processing of near-β Ti–Nb–Ag alloy with low elastic modulus and enhanced corrosion resistance for orthopedic implants

Cited by 17 publications

References 77 publications

Bimetallic CuNi Alloy Coatings on SS304 Substrate for Bipolar Plates of Proton Exchange Membrane Fuel Cells

Bimetallic CuNi Alloy Coatings on SS304 Substrate for Bipolar Plates of Proton Exchange Membrane Fuel Cells

Wear Behavior of Ti-xNb Biomedical Alloys by Ball Cratering

Powder Metallurgical Manufacturing of Ti-Nb alloys Using Coarse Nb Powders

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