Surface modification of NiTi by plasma based ion implantation for application in harsh environments

Oliveira, R. M.; Fernandes, Bruno Bacci; Carreri, F.C.; Gonçalves, J.A.N.; Ueda, M.; Silva, M.M.N.F.; Silva, M.M.; Pichon, L.; Camargo, Eliene Nogueira de; Otubo, Jorge

doi:10.1016/j.apsusc.2012.09.161

Cited by 17 publications

(6 citation statements)

References 16 publications

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“…The onset of corrosion is usually distinguished by a quick increase of the anodic current density. 10 A lower current density, higher R p and E corr represent a better corrosion resistance. 21 The best corrosion resistance behaviour is related to N 2 -7 among the coating samples.…”

Section: Resultsmentioning

confidence: 99%

“…21 The best corrosion resistance behaviour is related to N 2 -7 among the coating samples. Therefore, the presence of the extra shielding TiN layer on the passivated NiTi substrate results in better corrosion resistance, 10,22 but this layer predisposes for pitting corrosion. It can be seen in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…5,6 It was reported that TiN coatings exhibit characteristics, such as high melting point, thermal conductivity, chemical stability, 7 great corrosion resistance, 8 high wear resistance 9 and biocompatibility. 10 Piscanec et al 11 studied the bioactivity behaviour of the TiN coating on titanium implant and discovered that TiN is a sterling surface for the nucleation of calcium phosphate phases. Moreover, human bones demonstrate low elastic modulus, so using an implant material with similar elastic modulus like TiN coating should be most advantageous by reducing the stress shielding effect.…”

Section: Introductionmentioning

confidence: 99%

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Electrochemical behaviour of NiTi alloy coated with TiN using DPF

Soltanalipour

Khalil‐Allafi

Ghareshabani

et al. 2017

Surface Engineering

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Dense plasma focus (DPF) nitriding method was used to coat titanium nitride (TiN) on NiTi alloys as bone implant. These coatings were developed to modify the surface properties, such as corrosion resistance and biocompatibility. This method was done with a pressure of 2 mbar and voltage of 8 kV under pure nitrogen gas and mixed gas of nitrogen and argon separately. The electrochemical behaviour of the uncoated and coated samples was assessed by open circuit testing, potentiodynamic scanning and the electrochemical impedance spectroscopy in Ringer's solution at 37°C. Ni concentration in the Ringer's solution at 37°C was measured via the atomic absorption spectrometry. The TiN-modified surface of the sample with a distance of 7 cm from anode under 100% nitrogen gas during DPF nitriding demonstrates good corrosion resistance and low nickel ion release that could lead to a better biocompatibility.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Electrochemical behaviour of NiTi alloy coated with TiN using DPF

Soltanalipour

Khalil‐Allafi

Ghareshabani

et al. 2017

Surface Engineering

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“…Hence, the wear property plays an important role in joint replacement and these candidate applications need good surface wear property [8]. Many surface modification treatments have been studied to improve the surface corrosion, wear, and abrasion resistance of NiTi alloy to extend its service life, including ion implantation, shot peening, and so on [9,10]. Hu et al used the surface mechanical attrition treatment (SMAT) to induce grain refinement on the top layer of NiTi alloy, which shows that the friction coefficient decreased and the wear resistance was improved after surface treatment with mechanical attrition [11].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Laser Nitriding on Surface Characteristics and Wear Resistance of NiTi Alloy with Low Power Fiber Laser

et al. 2021

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The laser nitriding was performed in nitrogen gas at room temperature (20 °C) and low temperature (−190 °C) by a low power fiber laser to modify the wear and abrasion resistance of NiTi alloy. The surface roughness and element composition were analyzed by roughness device and energy-dispersive X-ray spectroscopy respectively. The results of roughness show that laser treatment can change the surface roughness due to the laser remelting. The effect of laser nitriding on the microhardness, friction coefficient, and worn scars of NiTi alloy was also studied, which shows that the microhardness of the NiTi alloy increases after laser nitriding. The optical microscope and scanning electron microscope were used to characterize the surface of NiTi alloy after wear testing to observe the microstructure of worn scars. The results show that the laser nitriding with different parameters can induce a nitride layer with different thicknesses and the higher energy deposition is the key factor for the formation of the nitride layer, which can decrease the friction coefficient and reduce wear loss during the application of NiTi alloy. The improvement of wear resistance can be attributed to the hard nitriding layer.

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“…Intrinsic advantages of the method are concerned with the modification of inner layers of Nb, avoiding problems with delamination and dimensional variation. When the substrate is heated with the aid of an auxiliary system during implantation (HT-PBII) [21][22][23][24][25][26] , the positive ions implanted into the respective surface can reach deeper layers due to thermal diffusion. Through the adjustment of the variables of the process (treatment duration, substrate temperature and the parameters of the high negative voltage pulses used for ion implantation), distinct nitrogen atomic concentration profiles can be attained.…”

Section: Introductionmentioning

confidence: 99%

The Surface Treatment of Niobium Superconducting Reentrant Cavities by Means of High Temperature Nitrogen Plasma Based Ion Implantation

et al. 2019

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High Temperature Nitrogen Plasma Based Ion Implantation (HT-NPBII) has been used to treat the surface of niobium superconducting reentrant cavities, which are part of parametric transducers in a resonant-mass gravitational wave detector. The aim is to enhance the corresponding electrical quality factors (Q-factors) which are closely related with the increase of the sensitivity of the system. In this experiment, the cavities are immersed in plasma and bombarded by energetic nitrogen ions, which are implanted into the surfaces of these heated substrates. The heating temperature of the cavities is controlled during the treatment and its level directly affects the N implantation depth profile due to the diffusion process. Additional tailoring of the nitrogen doping can be performed by the adjustment of the intensity and the duty cycle of the high negative voltage pulses used for ion implantation. For implantations performed at 5 kV /20 μs /300 Hz/ 700 °C, nitrogen atoms occupy interstitial spaces in the crystal lattice of niobium. The treatment of niobium superconducting cavities under these parameters caused the enhancement of two orders of magnitude of respective Q-factors. A set of characterization techniques was performed herein in order to help with the understanding of the underlying mechanism behind this phenomenon.

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Surface modification of NiTi by plasma based ion implantation for application in harsh environments

Cited by 17 publications

References 16 publications

Electrochemical behaviour of NiTi alloy coated with TiN using DPF

Electrochemical behaviour of NiTi alloy coated with TiN using DPF

The Effect of Laser Nitriding on Surface Characteristics and Wear Resistance of NiTi Alloy with Low Power Fiber Laser

The Surface Treatment of Niobium Superconducting Reentrant Cavities by Means of High Temperature Nitrogen Plasma Based Ion Implantation

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