Plasma surface treatment and PACVD on Ti alloys for surgical implants

Rie, K.‐T.; Stucky, T.; Silva, R.A.; Leitão, E.; Bordji, Karim; Jouzeau, Jean‐Yves; Mainard, Didier

doi:10.1016/0257-8972(95)08316-2

Cited by 73 publications

(34 citation statements)

References 2 publications

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“…5c). Accelerated grain growth is often reported for nitrided samples treated above 900°C [38] and therefore treatments at temperatures approaching this value are likely to exhibit an overall inferior performance.…”

Section: Fatigue Test Resultsmentioning

confidence: 99%

Evaluating the effects of plasma diffusion processing and duplex diffusion/PVD-coating on the fatigue performance of Ti–6Al–4V alloy

Cassar

Wilson²,

Banfield

et al. 2011

International Journal of Fatigue

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a b s t r a c tThe effect of triode-plasma enhanced low-pressure oxygen and/or nitrogen diffusion treatments, either as a single process or in conjunction with plasma-assisted physical vapour deposition (PAPVD) on Ti6Al-4V has been studied under rotating-bending fatigue testing. Following the diffusion treatment, samples exhibit a hardened case, more than 30 lm deep. Semi-logarithmic S-N plots are used to demonstrate and compare the significant changes in fatigue resistance obtained from each process. Fractography and residual stress measurements show that, compared to annealed samples, the fatigue strength of the diffusion-treated samples was superior; although the result changed depending on the processing parameters and microstructure of the substrate material. Also, unsupported and mechanically uncompliant ceramic coatings, such as TiN, promote the initiation of multiple crack sites, which lead to premature failure of the Ti-alloy substrate and a consequent reduction in endurance limit.

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Section: Fatigue Test Resultsmentioning

confidence: 99%

Evaluating the effects of plasma diffusion processing and duplex diffusion/PVD-coating on the fatigue performance of Ti–6Al–4V alloy

Cassar

Wilson²,

Banfield

et al. 2011

International Journal of Fatigue

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“…However, occasionally the use of c.p. Ti as implant is problematic as long as it presents low wear resistance 5,6 . A crucial issue concerning the removal of the bacterial plaque from the transmucous dental implant cylinders is the possibility of damage by the routine instruments, such as stainless steel Gracey scaler, sonic and ultrasonic apparatus [7][8][9][10] .…”

Section: Introductionmentioning

confidence: 99%

“…In fact, this has been the subject of several investigations in clinical dentistry 4 . Among the surface treatment techniques, the most reported are: plasma assisted chemical vapor deposition 5 , conventional ion implantation [15][16][17][18][19] , plasma source nitrogen ion implantation 20 , conventional nitriding 21 , conventional plasma nitriding 22,23 , intensified plasma ion nitriding 24 , physical and chemical vapor deposition TiN films [25][26][27][28] , powder immersion reaction assisted coating method 29 , laser heating 30,31 as well as combined techniques 32,33 . Improvement on the mechanical and tribological properties of c.p.…”

Section: Introductionmentioning

confidence: 99%

Surface modification of titanium by plasma nitriding

et al. 2003

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A systematic investigation was undertaken on commercially pure titanium submitted to plasma nitriding. Thirteen different sets of operational parameters (nitriding time, sample temperature and plasma atmosphere) were used. Surface analyses were performed using X-ray diffraction, nuclear reaction and scanning electron microscopy. Wear tests were done with stainless steel Gracey scaler, sonic apparatus and pin-on-disc machine. The obtained results indicate that the tribological performance can be improved for samples treated with the following conditions: nitriding time of 3 h; plasma atmosphere consisting of 80%N 2 +20%H 2 or 20%N 2 +80%H 2 ; sample temperature during nitriding of 600 or 800 °C.

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“…But reports on the wear behaviour of Ti thin layers are rare. Since titanium nitrides are hard biocompatible materials [20][21][22] with excellent resistance to abrasion, more advanced processing methods have been developed in order to achieve a nitride layer on the surface of materials. At the presence of nitride in plasma [23], nitrogen atoms diffuse into the titanium matrix, forming a layer of TiN and Ti 2 N compounds, usually followed by a deeper diffusion layer.…”

mentioning

confidence: 99%

A Novel Engineering Spherical Bearing, with Potential Application for a Hip Implant

Florescu¹,

Capitanu²,

Badita³

et al. 2016

JMEA

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Abstract:It is a research which could enter into contradiction with the current trend concerning the hip implants. It is known as sliding friction, which is characteristic of present artificial hip joints, is higher than in the case of rolling friction. The paper reports the studies of the functioning mode of a novel spherical bearing MoM (metal on metal) with rolling friction, with potential application for an artificial hip joint obtained by introducing a number of balls between the femoral head and the acetabular cup. After over 15 years of research upon the functional principle and constructive solution, a version that offered a coefficient of minimum friction in the hip joint came to light. This version was based on a constructive solution of motion with lower friction, "Omnitrack ® movement solutions", which has been modified and rebuilt to be used as a joint of a total hip prosthesis-MOMJ. The joint was built entirely in stainless steel, SS316L medical grade. Tests have been carried out on the experimental laboratory devices that showed very low values of the coefficient of friction (μ = 0.0225). For validation, the prosthesis had to be put through tests for 500,000 cycles, in terms of physiological motion and dynamic loading, according to ISO 14242-3. Testing was conducted on a multiaxial dynamics machine, MTS Bionix, equipped with system for hip implant testing. The testing results of this total hip prosthesis with rolling friction have been successful in signing up for a friction moment of 0.525 kNmm which means a coefficient of friction μ = 0.0143, for a joint with femoral head diameter 28 mm.

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Plasma surface treatment and PACVD on Ti alloys for surgical implants

Cited by 73 publications

References 2 publications

Evaluating the effects of plasma diffusion processing and duplex diffusion/PVD-coating on the fatigue performance of Ti–6Al–4V alloy

Evaluating the effects of plasma diffusion processing and duplex diffusion/PVD-coating on the fatigue performance of Ti–6Al–4V alloy

Surface modification of titanium by plasma nitriding

A Novel Engineering Spherical Bearing, with Potential Application for a Hip Implant

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