Nitric acid passivation of Ti6A14V reduces thickness of surface oxide layer and increases trace element release

Callen, B. W.; Lowenberg, B.; Lugowski, Stanley; Sodhi, Rana N.S.; Davies, J. V.

doi:10.1002/jbm.820290302

Cited by 92 publications

(53 citation statements)

References 26 publications

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“…GIXRD spectra of untreated P1 and P2 foams; after 7 and 14 days of SBF immersion. the other hand, nitric acid treatment was shown not to affect the surface roughness, but decreased the thickness of the naturally formed oxide layer on the surface [26,27] and increased the surface energy [15]. In the present study, the AFM surface roughness values of NAT foams are nearly the same with those of untreated foams, agreeing with the results of Lu et al [15] and Sittig et al [28].…”

Section: Discussionsupporting

confidence: 91%

The effect of nitric acid surface treatment on CaP deposition of Ti6Al4V open-cell foams in SBF solution

Türkan¹,

Güden

2010

Surface and Coatings Technology

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The effect of nitric acid surface treatment on CaP deposition of an open-cell Ti6Al4V foam (60% porous and 300-500 m in pore size), prepared by means of the space holder method using 94 and 66 μm average particle size powders, was investigated in a simulated body fluid (SBF) solution up to 14 days. Although, nitric acid surface treatment did not change the foam flat surface roughness values significantly, it increased surface area difference greatly by introducing nano scale undulations on the surface. The increased surface area difference was found to be more pronounced in smaller particle size foam samples. A continuous relatively thin CaP coating layer formed after 5 and 14 days of SBF immersion in nitric acid surface treated small and larger average particle size foam specimens, respectively. Whereas, the cells of untreated foam specimen were observed to be filled with CaP precipitates and a continuous CaP layer development was found after 14 days of SBF immersion. These results were also confirmed with the grazing incidence XRD and FTIR analysis of SBF immersed specimens.

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Section: Discussionsupporting

confidence: 91%

The effect of nitric acid surface treatment on CaP deposition of Ti6Al4V open-cell foams in SBF solution

Türkan¹,

Güden

2010

Surface and Coatings Technology

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“…Then they were washed 2 times with acetone by ultrasonication for 10 min and 4 times with ultrapure water for 10 min. Each titanium disk was immersed in ultrapure water at 37°C for 12 h and ultrasonicated for 2 min; this water was analyzed by graphite furnace atomic adsorption spectrophotometry (GFAAS) [10][11][12][13]43 to confirm that no titanium debris produced during the preparation remained on the disk. After sterilization by autoclaving at 121°C for 20 min, each disk was settled into the well of a 24-well microplate with a silicone rubber tip inserted into the gap between the disk and the inside wall of the well to fix the disk in place.…”

Section: Titanium Disksmentioning

confidence: 99%

Metal ion release from titanium with active oxygen species generated by rat macrophagesin vitro

Kobayashi²,

Sumita

et al. 2000

J. Biomed. Mater. Res.

123

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The release of metal ions due to active oxygen species generated by macrophages (Mphi) phagocytosing high-density polyethylene (HDPE) particles was studied in vitro to investigate the mechanism behind the release of metal ions from titanium implants into nearby tissues in the absence of wear and fretting in vivo. To determine the effects of Mphis on metal ion release, titanium disks were immersed in different solutions and the titanium ions released from the titanium disks into each solution were quantified. The results revealed that active oxygen species generated by Mphis induced the metal ion release. In particular, the ion release was accelerated with HDPE because the Mphis that phagocytosed HDPE generated more active oxygen species than Mphis that did not phagocytose any HDPE. Metal ions were also released by organic species in the absence of Mphis. These are some of the causes for metal ion release from titanium implants in the absence of wear and fretting in vivo.

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“…4). The latter material is free of aluminum and vanadium, which are suspected to be toxic when used as a biomaterial for implants or devices [17,18]. The modest increase in density (10%) is unimportant for biomedical applications, while the decrease in modulus is beneficial to reduce stress shielding in implants [19].…”

Section: Mechanical Properties At Ambient Temperaturementioning

confidence: 99%

Microstructure and mechanical properties of Ti/W and Ti–6Al–4V/W composites fabricated by powder-metallurgy

Frary

Abkowitz²,

Dunand

2003

Materials Science and Engineering: A

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Tungsten-reinforced Ti and Ti Á/6Al Á/4V composites were fabricated by powder metallurgical techniques from Ti, W and Al Á/V powders. The microstructure of the composites consists of partially dissolved tungsten particles within an a/b titanium matrix containing tungsten in solid-solution. Yield and ultimate tensile strengths increase linearly with tungsten content in the range 0 Á/15 wt.% W and decrease near-linearly with temperature in the range 25 Á/540 8C. Ductility follows the opposite trend and is within technologically acceptable values, except for Ti/15W at 315 and 425 8C and Ti/10W at 540 8C which fractured near the ultimate stress value. The Ti Á/6Al Á/4V/10W composite shows the best combination of high strength and ductility at all temperatures. At ambient temperatures, Ti/10W exhibits a stress Á/strain curve very similar to Ti Á/6Al Á/4V (with a slight decrease in stiffness), while eliminating aluminum and vanadium alloy elements. Further improvements in mechanical properties of these non-equilibrium composites are likely to be achieved through optimized heat-treatments, which affect the matrix microstructure and the degree of dissolution of tungsten and thus the relative importance of matrix solid-solution strengthening and composite strengthening. # 2002 Published by Elsevier Science B.V.

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Nitric acid passivation of Ti6A14V reduces thickness of surface oxide layer and increases trace element release

Cited by 92 publications

References 26 publications

The effect of nitric acid surface treatment on CaP deposition of Ti6Al4V open-cell foams in SBF solution

The effect of nitric acid surface treatment on CaP deposition of Ti6Al4V open-cell foams in SBF solution

Metal ion release from titanium with active oxygen species generated by rat macrophagesin vitro

Microstructure and mechanical properties of Ti/W and Ti–6Al–4V/W composites fabricated by powder-metallurgy

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