An integrated experimental and computational approach to laser surface nitriding of Ti–6Al–4V

Dahotre, Sanket N.; Vora, Hitesh D.; Pavani, K.; Banerjee, Rajarshi

doi:10.1016/j.apsusc.2013.01.151

Cited by 33 publications

(15 citation statements)

References 19 publications

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“…Therefore, a variety of attempts were made to improve on the tribological performance, especially focusing on surface modification methods [3][4][5][6]. Boriding, which is one of the surface modification techniques, is a thermo chemical surface treatment process where boron atoms are diffused into a metal substrate and form one or more hard boride layer on the metal surface [7].…”

Section: Introductionmentioning

confidence: 99%

Characteristics and growth kinetics of plasma paste borided Cp–Ti and Ti6Al4V alloy

Ataibis

Taktak

2015

Surface and Coatings Technology

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Section: Introductionmentioning

confidence: 99%

Characteristics and growth kinetics of plasma paste borided Cp–Ti and Ti6Al4V alloy

Ataibis

Taktak

2015

Surface and Coatings Technology

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“…23,25 The surface wettability of bio-implant can be controlled by surface modification techniques, such as ion implantation, surface coating, chemical etching, and laser surface modification techniques. 23,26–34 However, among these modification techniques, laser surface modification seems the more effective and efficient technique for surface engineering of biomaterials. 29–31 This is due to its highly concentrated laser beam with high-energy that can generate excessively rapid rates of heating and cooling.…”

Section: Introductionmentioning

confidence: 99%

Laser surface modification of AZ31B Mg alloy for bio-wettability

Vora

Dahotre

2014

J Biomater Appl

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Laser surface modification of AZ31B Magnesium alloy changes surface composition and roughness to provide improved surface bio-wettability. Laser processing resulted in phase transformation and grain refinement due to rapid quenching effect. Furthermore, instantaneous heating and vaporization resulted in removal of material, leading the textured surface generation. A study was conducted on a continuum-wave diode-pumped ytterbium laser to create multiple tracks for determining the resulting bio-wettability. Five different laser input powers were processed on Mg alloy, and then examined by XRD, SEM, optical profilometer, and contact angle measurement. A finite element based heat transfer model was developed using COMSOL multi-physics package to predict the temperature evolution during laser processing. The thermal histories predicted by the model are used to evaluate the cooling rates and solidification rate and the associated changes in the microstructure. The surface energy of laser surface modification samples can be calculated by measuring the contact angle Santhanakrishnan, whose work demonstrated to me that how to concern the matters of research and always inspirited me to pursue to an advanced quality in experimentation and research. Comparing to the conventional metallic biomaterials such as Ti-6Al-4V, stainless steel, and Co-Cr based materials, using Mg implants can provide several benefits which other metallic implants lack. Hence high biocompatibility and the ability to degrade after bone regrowth are the significant reasons to develop Mg implants. (4) capillary rise, and (5) tilted drop. Static, or sessile drop method is the most commonly used technique, because it is easy to conduct. In this case, a droplet is placed on the testing surface by using a contact angle goniometer. The contact angle is defined as an angle formed between the solid-liquid interface and the liquid-vapor interface and which has its vertex where the three interfaces meet as shown in Fig 1.1(a). Young's equation shows the relation of interfacial tensions of solid-vapor (γ sv ), liquid-vapor (γ lv ), solid-liquid (γ sl ), and contact angle (θ) as follows:If the contact angle is greater than 90°, the surface can be considered as a hydrophobic surface (Fig 1.1(b)). On the contrary, the small contact angle on the testing surface refers to the wetting or hydrophilic surface (Fig 1.1(c)). Although it has been broadly accepted that the biological response of the surface can be influenced by hydrophobicity/hydrophilicity, the wetting effects to cell behavior are still in controversy and inconsistency. Many researchers described that it is necessary to improve surface from hydrophobicity to hydrophilicity for supporting cell adherence and, in particular, growth. On the contrary, other researchers presented that the hydrophobic surface performed better cell response [13]. However, it is now well accepted in biomaterial community both overly hydrophobic and overly hydrophilic surface are not ideal for cell attachment, rather, surfaces wi...

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“…Electrochemical treatments carried out on titanium in inorganic and organic electrolytes, with or without small amounts of fluoride ions, may change surface layer composition and produce compact, porous, gel-like, and/or nanotubular layers [7,8]. Due to simplicity of electrochemical methods such anodic layers are cheaper than obtained by nitriding [9] sol-gel coating [10], plasma oxidation [11] or biological modifications [12]. Particularly titania nanotubes are very useful for numerous applications due to the excellent adsorption, hydrophilic and photonic properties [13,14], the inertness and good biocompatibility [15], as well as sensing abilities [13,16].…”

Section: Introductionmentioning

confidence: 99%

Morphological and Chemical Relationships in Nanotubes Formed by Anodizing of Ti6al4v Alloy

Pawelska

Cydzik

2014

Advances in Materials Science

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The electrochemical formation of oxide nanotubes on the Ti6Al4V alloy has been so far difficult due to easy dissolution of vanadium reach β-phase of the two phase material. Due to the topographical heterogeneity of the anodic layer in nano and microscale at anodizing of the Ti6Al4V alloy we focused to establish the relationships between nanotube diameters on both phases of the alloy and fluorides concentration in electrolyte. We studied the effect of fluoride concentration (0.5-0.7 wt.%) in 99% ethylene glycol on morphological parameters of nanotube layer on the Ti6Al4V alloy anodized at 20V for 20 min. Nanotubes with diameter ~40-50 nm ±5nm on the entire Ti6Al4V alloy surface in electrolyte containing 0.6% wt. NH 4 F were obtained. Microscale roughness studies revealed that nanotubular layer on α-phase is thicker than on β-phase. The annealing of nanotube layers at 600°C for 2h in air, nitrogen and argon, typically performed to improve their electrical properties, influenced chemical composition and morphology of nanotubes on the Ti6Al4V alloy. The vanadium oxides (VO 2 , V 2 O 3 , V 2 O 5) were present in surface nanotube layer covering both phases of the alloy and the shape of nanotubes was preserved after annealing in nitrogen.

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An integrated experimental and computational approach to laser surface nitriding of Ti–6Al–4V

Cited by 33 publications

References 19 publications

Characteristics and growth kinetics of plasma paste borided Cp–Ti and Ti6Al4V alloy

Characteristics and growth kinetics of plasma paste borided Cp–Ti and Ti6Al4V alloy

Laser surface modification of AZ31B Mg alloy for bio-wettability

Morphological and Chemical Relationships in Nanotubes Formed by Anodizing of Ti6al4v Alloy

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