Microstructure and Transformation Behavior of Ni&lt;sub&gt;50&lt;/sub&gt;Ti&lt;sub&gt;50-x&lt;/sub&gt;Ta&lt;sub&gt;x&lt;/sub&gt; Alloys

Ma, Ji; Wu, Kuang‐Hsi; Pu, Zhenpeng

doi:10.4028/www.scientific.net/msf.327-328.179

Cited by 8 publications

(3 citation statements)

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“…Tantalum is another element that is often used for increasing radiopacity. Alloys consisting of NiTiTa, however, exhibit an increased transformation temperature, and are rather used for actuator applications [11,12]. Hence, Tantalum is often integrated in elemental form to the Nitinol structure, e.g., reservoirs can be created on the stent struts by laser ablation, filled with Ta powder, and closed by laser weldings [13,14].…”

Section: Introductionmentioning

confidence: 99%

Method for Fabricating Miniaturized NiTi Self-Expandable Thin Film Devices with Increased Radiopacity

Bechtold¹,

Miranda²,

Chluba

et al. 2016

Shap. Mem. Superelasticity

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Nitinol is the material of choice for many medical applications, in particular for minimally invasive implants due to its superelasticity and biocompatibility. However, NiTi has limited radiopacity which complicates positioning in the body. A common strategy to increase the radiopacity of NiTi devices is the addition of radiopaque markers by micro-riveting or micro-welding. The recent trend of miniaturizing medical devices, however, reduces their radiopacity further, and makes the addition of radiopaque markers to these miniaturized devices difficult. NiTi thin film technology has great potential to overcome such limitations and to fabricate new generations of miniaturized, self-expandable NiTi medical devices with additional functionalities, such as structured multilayer devices with increased radiopacity. For this purpose, we have produced superelastic thin film NiTi samples covered locally with Tantalum structures of different thickness and different shape. These multilayer devices were characterized regarding their mechanical and corrosion properties as well as their X-ray visibility. The superelastic behavior of the underlying NiTi layer is impeded by the Ta layer, and shows therefore a dependence on the Tantalum patterning geometry and thickness. No delamination was observed after mechanical and corrosion tests. The multilayers reveal excellent corrosion resistance, as well as a significant increase in radiopacity.

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Section: Introductionmentioning

confidence: 99%

Method for Fabricating Miniaturized NiTi Self-Expandable Thin Film Devices with Increased Radiopacity

Bechtold¹,

Miranda²,

Chluba

et al. 2016

Shap. Mem. Superelasticity

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“…The third element Ta addition can increase X-ray visibility [5,6]. The transformation temperatures of Ni-Ti-Ta alloys are less sensitive to the Ni content [5].…”

Section: Introductionmentioning

confidence: 99%

A study on lattice parameters of martensite in Ni–Ti–Ta shape memory alloys

Gong

Guo²,

Yang

2006

Journal of Alloys and Compounds

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“…Also surface modification with tantalum improves biocompatibility and radiopacity of NiTi alloys [7]. In investigated ternary Ni-Ti-Ta shape memory alloys tantalum element was added instead of titanium in quantity up to 15 wt.% [8][9][10]. With such composition alloys reveal a mixture of the B2 parent phase and the martensite B19' at room temperature.…”

Section: Introductionmentioning

confidence: 99%

Phase Transformation in Ti-Ni-Ta Shape Memory Alloy

Lekston

Goryczka

2007

SSP

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A new Ti50Ni48.7Ta1.3 shape memory alloy was designed for medical application. In order to influence the martensitic transformation temperature the alloy was solution treated and additionally aged at 400oC for various time. Phase transformation was studied applying differential scanning calorimeter (DSC) and X-ray diffraction techniques. The ageing causes that the martensitic transformation occurs in two steps: B2↔R↔B19’ during cooling and heating. During cooling the transformations: B2→R and R→B19’ are well separated whereas on heating they are overlapped. Also ageing causes a shift of temperatures of the martensitic transformation into the higher region. It is due to the precipitation process. Precipitates of the Ni4Ti3 phase were observed. Applied thermal treatment leads to shift of the transformation temperatures below temperature of a human body. This makes the Ti-Ni-Ta alloy attractive for application in medicine.

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Microstructure and Transformation Behavior of Ni<sub>50</sub>Ti<sub>50-x</sub>Ta<sub>x</sub> Alloys

Cited by 8 publications

References 0 publications

Method for Fabricating Miniaturized NiTi Self-Expandable Thin Film Devices with Increased Radiopacity

Method for Fabricating Miniaturized NiTi Self-Expandable Thin Film Devices with Increased Radiopacity

A study on lattice parameters of martensite in Ni–Ti–Ta shape memory alloys

Phase Transformation in Ti-Ni-Ta Shape Memory Alloy

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