Characterisation of surface-modified nickel titanium alloys

Armitage, David; Grant, David M.

doi:10.1016/s0921-5093(02)00818-3

Cited by 88 publications

(73 citation statements)

References 18 publications

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“…In comparison to MP, an increased number of CFUs was found in HT600. This was believed to be due to the prevention of Ni ion release because the oxide film had been thickened by heat treatment 16,24) . UV light is a collective term for electromagnetic waves with a wavelength range of 110-380 nm.…”

Section: Discussionmentioning

confidence: 99%

Effect of Surface Modification on the Photocatalysis of Ti-Ni Alloy in Orthodontics

Horiuchi

Hanawa

et al. 2007

Dent. Mater. J.

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Photocatalytic activity from the reaction of titanium oxide with ultraviolet light has recently gained much attention. In particular, there is scientific interest in inducing photocatalytic reactions on Ti-Ni alloy, a material widely used in orthodontic applications. However, it is believed that inducing a photocatalytic reaction with an amorphous oxide film on the alloy is a difficult challenge. In this study, therefore, we sought to induce a photocatalytic reaction on Ti-Ni alloy by subjecting the latter to electrolytic and heat treatments. Then, an antibacterial test was used to examine whether a photocatalytic reaction had indeed been induced. By thickening the titanium oxide film with electrolytic treatment and then applying heat treatment, the surface oxide film of Ti-Ni alloy was thus modified from amorphous structure to rutile crystal. Furthermore, it was revealed that Ti-Ni alloy had an antibacterial effect by virtue of the photocatalytic reaction.

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Section: Discussionmentioning

confidence: 99%

Effect of Surface Modification on the Photocatalysis of Ti-Ni Alloy in Orthodontics

Horiuchi

Hanawa

et al. 2007

Dent. Mater. J.

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“…9(b). Armitage et al 17) reported that oxidation of NiTi alloy was dominated by an outward growth of oxide at temperature greater than 400°C. On the basis of these results and report, the amorphous structure created by FPP accelerated the outward growth of nickel oxide during the subsequent oxidation process.…”

Section: Mechanism Of Forming Surface Oxide Layer On Thementioning

confidence: 99%

“…Figure 13 schematizes the mechanism of forming surface layer during oxidation process at temperature greater than 400°C, which is dominated by an outward growth of oxide. 17) The microstructure of the oxide layers depends on J Ni M : the nickel diffusion rate through the material, and J Ni O : the nickel diffusion rate through the oxide layer.…”

Section: Mechanism Of Forming Surface Oxide Layer On Thementioning

confidence: 99%

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Effects of Fine Particle Peening on Oxidation Behavior of Nickel–Titanium Shape Memory Alloy

et al. 2014

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The effects of fine particle peening (FPP) on oxidation behavior of nickeltitanium shape memory alloy (NiTi alloy) were evaluated. After FPP treatment, oxidation process was performed at 300, 400 and 500°C for 30 min in N 2 20 vol%O 2 atmosphere. Surface microstructures of oxidized specimens pre-treated with FPP were characterized using scanning electron microscope (SEM), glow discharge optical emission spectroscopy (GD-OES), X-ray photoelectron spectroscopy (XPS) and X-ray diffraction analysis (XRD). Oxide layers formed on the specimens pre-treated with FPP were thinner than those on the un-peened ones. Amorphous titanium oxides (TiO and TiO 2 ) were formed on the un-peened specimens by oxidation process, whereas a nickel oxide (NiO) was created on the FPP-treated surface oxidized at temperature greater than 400°C as well as titanium oxides. This was because an amorphous structure created by FPP accelerated the outward growth of nickel oxide during the subsequent oxidation process. Moreover, the effects of surface oxide layers on the biocompatibility of NiTi alloy were investigated. Due to the formation of a thin oxide layer which contains nickel element, the oxidized specimen pre-treated with FPP showed higher amount of nickel ion elution than that of the oxidized one during the cell culture tests. These results suggest that microstructural feature of surface oxide layer strongly affects the biocompatibility of NiTi alloy.

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“…These include studies on fatigue [5], corrosion [6], surface chemistry [7], and due to the use of shape memory materials in medical devices, interactions with cells [8,9].…”

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confidence: 99%

Surface roughness-controlled superelastic hysteresis in shape memory microwires

Ueland¹,

Schuh²

2014

Scripta Materialia

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Superelasticity in Cu-Zn-Al shape memory alloy microwires is studied as a function of surface roughness. Wires with a rough surface finish dissipate more than twice as much energy per unit volume during a superelastic cycle than do electropolished wires with smooth surfaces. We attribute the increased damping in wires with large surface roughness to the increased density of surface obstacles where frictional energy is dissipated as heat during martensitic phase transformation.

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Characterisation of surface-modified nickel titanium alloys

Cited by 88 publications

References 18 publications

Effect of Surface Modification on the Photocatalysis of Ti-Ni Alloy in Orthodontics

Effect of Surface Modification on the Photocatalysis of Ti-Ni Alloy in Orthodontics

Effects of Fine Particle Peening on Oxidation Behavior of Nickel–Titanium Shape Memory Alloy

Surface roughness-controlled superelastic hysteresis in shape memory microwires

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Characterisation of surface-modified nickel titanium alloys

Cited by 88 publications

References 18 publications

Effect of Surface Modification on the Photocatalysis of Ti-Ni Alloy in Orthodontics

Effect of Surface Modification on the Photocatalysis of Ti-Ni Alloy in Orthodontics

Effects of Fine Particle Peening on Oxidation Behavior of Nickel&ndash;Titanium Shape Memory Alloy

Surface roughness-controlled superelastic hysteresis in shape memory microwires

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Effects of Fine Particle Peening on Oxidation Behavior of Nickel–Titanium Shape Memory Alloy