The influence of laser power and repetition rate on oxygen and nitrogen insertion into titanium using pulsed Nd:YAG laser irradiation

Lavisse, L.; Jouvard, Jean-Marie; Gallien, Jean Paul; Berger, Pascal; Grevey, D.; Naudy, Ph.

doi:10.1016/j.apsusc.2007.07.204

Cited by 30 publications

(19 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…On the other hand, the oxygen content increases by a factor 2 in the 100-400 J cm À2 range, is almost constant up to 500 J cm À2 and slightly increases for higher F l values. This different behaviour has been dealt with in an earlier study [14].…”

Section: Morphology and Composition Of The Layersmentioning

confidence: 90%

Growth of titanium oxynitride layers by short pulsed Nd:YAG laser treatment of Ti plates: Influence of the cumulated laser fluence

Lavisse

Sahour

Jouvard

et al. 2009

Applied Surface Science

Self Cite

View full text Add to dashboard Cite

Section: Morphology and Composition Of The Layersmentioning

confidence: 90%

Growth of titanium oxynitride layers by short pulsed Nd:YAG laser treatment of Ti plates: Influence of the cumulated laser fluence

Lavisse

Sahour

Jouvard

et al. 2009

Applied Surface Science

Self Cite

View full text Add to dashboard Cite

“…Since the voltage controls the welding energy, an increase of voltage leads to a greater welding depth [4][5][6][7][8][9][10][11][12][13][14][15]17]. Chai and Chou [18] reported that pulse duration is not a significant factor to affect the Ultimate Tensile Strength (UTS) or the Yield Strength (YS).…”

Section: Discussionmentioning

confidence: 99%

“…Laser beams are widely used for surface modification [4][5][6][7][8][9][10][11] because specific thermal characteristics induced by laser irradiation can generate specific microstructures including metastable phases and nano-crystalline grains. The convective fluxes and hydrodynamic instabilities inside the irradiated surface layers contribute to the heat transport to mix the ambient gas and molten metal.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Microstructure and mechanical properties of surface treated cast titanium with Nd:YAG laser

Poulon-Quintin¹,

Watanabe²,

Watanabe³

et al. 2012

Dental Materials

View full text Add to dashboard Cite

Objective: To investigate the effect of laser surface treatment of cast titanium alloy on microstructure and mechanical properties.Methods: Dumbbell-and plate-shaped cast titanium specimens were prepared for mechanical testing and microstructure analysis. After the cast surfaces of each specimen were laser-treated using a dental Nd:YAG laser machine at 240 V and 300 V with and without argon gas shielding, tensile testing and microstructure analysis were conducted.Hardness depth profiles were also made from the cross-section of laser-treated cast specimens. Microstructural and chemical analysis were performed by means of the SEM, XRD, AES and WDS.Results: The results of tensile testing and Vickers hardness depth profiling showed that laser treatment improved the mechanical properties. Bulk microstructure of as-cast titanium was mainly composed of α-grains with acicular and widmanstatten patterns.The laser melted zone was characterized by columnar beta grains. When the emission voltage of laser increased to 300 V, a larger grain size was promoted. The XRD analysis indicated that the beta phase formation was clearly noticeable after laser surface treatment. Supplementary marked peaks of the TiO, TiO 2 and Ti 2 N were detected without argon gas shielding. When argon shielding gas was used, the presence of titanium oxide was significantly reduced and the peaks of titanium nitride disappeared.Significance: Laser treatment on cast titanium surfaces showed significant enhancement of mechanical properties and modification of microstructures, and therefore could produce reliable titanium metal frameworks for dental prostheses.3

show abstract

“…The threshold fluence for nitrogen insertion through nanosecond laser irradiation on titanium lies at approximately 9 J cm À2 . [19] Although the laser utilized fluencies here were 2.5-3.4 J cm À2 , higher energy densities are obtained in interference maxima (I max ¼ 4I 0 ), suggesting a local insertion of nitrogen and the formation of titanium nitride. As nitrogen doping of TiO 2 is generally associated with hydrophilic behavior and XPS analysis is very surface sensitive ($1 nm escape depth of the electrons), its impact on contact angle in this case has to be considered negligible compared to other influences.…”

Section: By Michael Hans* Carsten Gachot Frank Müller and Frank Mücmentioning

confidence: 99%

Direct Laser Interference Structuring as a Tool to Gradually Tune the Wetting Response of Titanium and Polyimide Surfaces

et al. 2009

View full text Add to dashboard Cite

Adjusting the wetting behavior of materials by modifying their surface properties can be convenient for many industrial processes such as coating, drying, and adhesion applications. Total wetting of hydrophilic surfaces has its benefits in painting and lubricated processes, hydrophobic surfaces on the other hand are desirable for liquid flow, dewetting, and low friction concerns. [1][2][3] Especially, the development of superhydrophobic (even superoleophobic) surfaces and the stabilization of this sensitive wetting state have recently drawn a noticeable amount of attention. [4,5] The underlying parameters, which define, whether a solid will be covered in liquid or show fluid-repelling behavior, are the surface energies of the substances involved and the surface topography. [6] Apart from chemical modifications, artificial surface roughness has been found to be most effective in tailoring specific wetting conditions on solid materials. Topographical surface design directly affects the solid-liquid contact area and the triple line movement in dynamic wetting conditions. Numerous physical and chemical surface treatments have proven their efficiency in this field, yet most of them are time-consuming and extensive. In this work, we have created moderate aspect ratio surface structures by direct laser interference structuring (LIS) of titanium and polyimide in order to gradually tune their wetting response. LIS is a fast, contactless surface structuring technique, based on the interference of one or more coherent, superimposed, and high-power pulsed laser beams. It allows the creation of periodic surface structures with a well-defined long-range order on the micro/nanoscale in one single preparation step. During irradiation, photo-thermal interaction between laser and material according to the intensity distribution of the re-combined laser beam induces distinct local heating of the surface. In the case of metals, metallurgical processes such as melting, recrystallization, recovery and defect, and phase formation are initiated on the lateral scale of the microstructure itself. Therefore, LIS of metals is also referred to as laser interference metallurgy (LIMET). [7] In contrast, the interaction of high power laser light with polymers is governed by significant ablation processes. [8,9] In order to cover both the domains, bulk titanium and polyimide have been processed with two kinds of surface patterns each at various energy densities and structure periods. Polyimide has been chosen with regard to its notable chemical resistance, as all samples had to undergo extensive chemical cleaning and drying prior to contact angle determination. Statistical static contact angle measurements have been carried out with bi-distilled water on flat reference specimen and structured surfaces. Scanning and transmission electron microscopy (SEM, TEM) and white light interferometry (WLI) allowed the characterization of surface topographies and their implementation in established models for wetting behavior of rough solid surfaces. Further...

show abstract

The influence of laser power and repetition rate on oxygen and nitrogen insertion into titanium using pulsed Nd:YAG laser irradiation

Cited by 30 publications

References 23 publications

Growth of titanium oxynitride layers by short pulsed Nd:YAG laser treatment of Ti plates: Influence of the cumulated laser fluence

Growth of titanium oxynitride layers by short pulsed Nd:YAG laser treatment of Ti plates: Influence of the cumulated laser fluence

Microstructure and mechanical properties of surface treated cast titanium with Nd:YAG laser

Direct Laser Interference Structuring as a Tool to Gradually Tune the Wetting Response of Titanium and Polyimide Surfaces

Contact Info

Product

Resources

About