Electrolytic processing of NiTi shape memory alloys

Pohl, M.; Heßing, C.; Frenzel, Jan

doi:10.1016/j.msea.2003.11.080

Cited by 68 publications

(34 citation statements)

References 4 publications

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“…Electropolishing involves the removal of a very thin surface layer by immersing the material in a highly ionic solution with an electric current (17). This process has a leveling effect, producing a smooth surface with an increased reflectivity (Fig.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Electropolishing on Torque and Force During Simulated Root Canal Preparation with ProTaper Shaping Files

Boessler

Paqué

Peters

2009

Journal of Endodontics

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The effect of electropolishing on torque and force during simulated root canal preparation with ProTaper shaping files Abstract Surface modifications of nickel-titanium instruments such as electropolishing may reduce fracture incidence but could potentially alter the instruments' mechanical properties. We studied the impact of two surface types, machined and electropolished, of ProTaper shaping files on torque and force during simulated root canal preparation. Pilot holes of 0.5-mm diameter were drilled perpendicularly through 3-mm thick human dentin discs and served as standardized simulated root canals (SSRCs). A total of 300 SSRCs were prepared with ProTaper Sx, S1, and S2 instruments using an automated testing platform. Maximum torque (in Ncm) and maximum force values (in N) were measured. In three experimental groups (Sx, S1, and S2) preparation of SSRCs was performed using electropolished versus machined instruments in the same dentin disc. For all three tested instruments, peak torque was higher for electropolished files; apically exerted forces were similar, except for Sx, in which machined instruments developed higher forces. We conclude that surface treatment by electropolishing alters the cutting ability of nickel-titanium rotary instruments.

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Section: Introductionmentioning

confidence: 99%

The Effect of Electropolishing on Torque and Force During Simulated Root Canal Preparation with ProTaper Shaping Files

Boessler

Paqué

Peters

2009

Journal of Endodontics

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“…It is interesting to note that after 120 seconds the mass removal rate apparently increased for the superelastic alloy and decreased for the shape memory alloy. In a similar study, Pohl et al 7 investigated the surface topography of a NiTi alloy (50.5 at. % Ni and Af = 34°C).…”

Section: Electrolytic Polishingmentioning

confidence: 99%

“…Although they achieved an initial reduction in the surface roughness, longer polishing periods lead to waviness formation due to material segregation. Armitage and Grant 13 used a nitric acid solution, like that used by Pohl et al 7 , for the electropolishing at -30°C of a nominally equiatomic NiTi alloy with a martensitic start temperature of 92.1°C, using a potential of 15 V; they reported that the electrolytic polishing resulted in a rougher surface.…”

Section: Electrolytic Polishingmentioning

confidence: 99%

“…Although electropolishing of NiTi is already used commercially, there are few descriptive papers on the electrolytic polishing processes and parameters of NiTi alloys. Most knowledge on this area is empirical 4 and few systematic studies have been published [6][7][8] . The aim of our study was to find and report suitable parameters for the electropolishing of NiTi alloys at 20°C, with martensitic or austenitic structures, to enable its application as a biomaterial.…”

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Surface Characterization of NiTi Superelastic and Shape Memory Alloys After Electrolytic Polishing

et al. 2017

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For the biomedical application of NiTi alloys, an excellent surface finishing process is required to guarantee high corrosion resistance and biocompatibility, eliminating the allergenic and toxic effects associated with the release of nickel ions in the body. Electropolishing is a process that can reduce surface imperfections and form a thin protective layer of TiO 2 , even in complex-shaped devices. The main objective of our study was to find and report suitable parameters for electrolytic polishing of NiTi wires, in both the superelastic and shape memory states. The results indicate that electropolishing in a 3.5 mol•L -1 methanolic H 2 SO 4 electrolyte at 20°C can effectively reduce surface roughness, remove superficial nickel-rich layers and improve corrosion resistance for austenitic and martensitic NiTi alloys.

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“…We opted for that format due to difficulties in the machining process, among which its hardness (66.84 HRA) stands out, as well as the existence of data showing that the emissivity of the cylinder-shaped SMA was obtained through thermography in similar conditions [12]. Moreover, cutting the samples can create superficial tensions that can eventually result in martensitic transformations of the material [13][14]. The cuts A1 and A2 were made with a precision cut-off machine (Struers Secotom-15) in low-speed conditions (0.005 mm/s) with around 10 mm diameter and 100 mm length, being continuously cooled by a cooling fluid.…”

Section: Samplesmentioning

confidence: 99%

Emissivity Measurements on Shape Memory Alloys

Silva

Sá²,

Silva

et al. 2016

Proceedings of the 2016 International Conference on Quantitative InfraRed Thermography

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In many applications of Shape Memory Alloys, the most appropriate means and sometimes the only one to measure temperature is thermography, which relies on knowing the emissivity of the material. This paper aims to evaluate experimentally the behavior of the emissivity of a NiTi shape memory alloy as a function of temperature in order to investigate how the emissivity behaves during phase transformation and how it may impact the measured temperature. The emissivity of a Ni55Ti45 shape memory alloy was measured by means of active and passive infrared sensors in a spectral band of 8-14 µm in the temperature range from 25 to 100ºC under a vacuum of 3 x 10 -3 Pa. The results show that the emissivity of the Ni55Ti45 shape memory alloy varied approximately 9% between fully martensitic and fully austenitic states.

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Electrolytic processing of NiTi shape memory alloys

Cited by 68 publications

References 4 publications

The Effect of Electropolishing on Torque and Force During Simulated Root Canal Preparation with ProTaper Shaping Files

The Effect of Electropolishing on Torque and Force During Simulated Root Canal Preparation with ProTaper Shaping Files

Surface Characterization of NiTi Superelastic and Shape Memory Alloys After Electrolytic Polishing

Emissivity Measurements on Shape Memory Alloys

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