Enhancement of Surface Properties Using Ultrashort-Pulsed-Laser Texturing: A Review

Alsaigh, Reem A.

doi:10.3390/cryst14040353

Cited by 4 publications

(1 citation statement)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Surface texturing, as a means of material surface treatment, has been proven to effectively improve surface friction performance [1,2]. It has been widely applied in many engineering projects, such as bearings, tools, and gears [3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Study on the mixed lubrication of rough planar extrusion considering surface texture

Su,

Shao,

Tang

et al. 2024

Surf. Topogr.: Metrol. Prop.

View full text Add to dashboard Cite

Surface texture plays a crucial role in fluid dynamic lubrication. The non-Newtonian thermal elastohydrodynamic lubrication problem involving rough surfaces with texture has not been investigated to date. In this paper, a model for non-Newtonian thermal elastohydrodynamic lubrication incorporating rough surfaces and texture morphology is developed, focusing on the problem of mixed lubrication in planar extrusion with texture. The model builds upon the Reynolds equation with flow factor introduced. It considers the effects of rough surface texture, thermal effects, and non-Newtonian effects. The Reynolds equation is numerically solved using the Semi-System method to calculate the oil film pressure in full film region and contact pressure in dry contact area. The DC-FFT algorithm is employed to calculate surface elastic deformation. Comparing the calculated friction coefficient of the present model with the measured values in literature experiments, the average error is only 6.94%. Furthermore, the study investigates the effects of texture, temperature, and non-Newtonian on interfacial lubrication performance under mixed lubrication conditions. It’s found that compared to untextured surface, the average film thickness of textured surface increased by a maximum of 10.8%, and the friction coefficient decreased by a maximum of 67.4%; Compared to Newtonian fluids, shear thinning fluids reduce temperature by 0.18%, and shear thickening fluids are more conducive to improving mixed lubrication performance. A stepped pit texture is designed based on the dynamic pressure mechanism of the texture, indicating that the circular stepped pit texture has the best load-bearing capacity improvement.

show abstract

Section: Introductionmentioning

confidence: 99%

Study on the mixed lubrication of rough planar extrusion considering surface texture

Su,

Shao,

Tang

et al. 2024

Surf. Topogr.: Metrol. Prop.

View full text Add to dashboard Cite

show abstract

Laser power modulation between disturbed and undisturbed material removal regime in laser chemical processing

Lu,

Bouraoui,

Niehaves

et al. 2024

Int J Adv Manuf Technol

View full text Add to dashboard Cite

Laser chemical machining (LCM) is a method for removing material by thermally induced chemical dissolution of self-passivating metals. However, the process window is limited by disrupted material removal due to gas bubble formation and metallic salts and oxides deposition at higher energy input. Since the temperature increases, and therefore gas bubble growth takes time, it is hypothesized that the temporal modulation of laser power can remove the metal homogeneously, i.e., without disrupted material removal, while achieving a higher removal rate. Based on this, the dynamic process behavior of material removal is investigated for the LCM of titanium in phosphoric acid, using a rectangular modulation of the laser power with varying irradiation durations. As a result, however, high-speed videos show that gas bubbles are consistently generated, regardless of the applied laser power and power modulation, although the quantity of bubbles varies with different parameters. Even with short power durations (10 ms), the material deposition occurs after multiple irradiations. When the duration is longer, the material deposition increases in height along the laser scan direction. For the studied process parameters, a Fourier analysis in the spatial domain further indicates the correlation between the material removal frequencies and the modulation frequencies. In conclusion, the laser power modulation cannot prevent the disturbed material removal at high laser powers. Nevertheless, the material deposition can be utilized to generate periodic surface structures with a depth below and above the initial surface.

show abstract

Development of Polymer Hydrophobic Surfaces Through Combined Laser Ablation and Hot Embossing Processes

Ghadiri Zahrani,

Fakharzadeh Jahromi,

Azarhoushang

2024

JMMP

View full text Add to dashboard Cite

The development of hydrophobicity on polymer surfaces in mass production is one of the most critical challenges in the plastic industry. This paper deals with a novel combined hot embossing process in which femtosecond laser ablation is utilized to texture the embossing stamps. By controlling the process temperature and axial forces, the laser textures were transferred to polymer surfaces, successfully resulting in hydrophobicity. Four different polymers, including ABS, PP, PA, and PC, along with two different laser textures, namely ball and pyramid, were tested. The laser and hot embossing parameters under which the textures were transferred to the polymers are introduced. The critical micro- and nano-features of the transferred textures that resulted in high hydrophobic contact angles are also discussed. The results indicate that PP and ABS have higher contact angles, respectively, while under the given parameters, PA and PC did not exhibit hydrophobic surfaces.

show abstract

Enhancement of Surface Properties Using Ultrashort-Pulsed-Laser Texturing: A Review

Cited by 4 publications

References 46 publications

Study on the mixed lubrication of rough planar extrusion considering surface texture

Study on the mixed lubrication of rough planar extrusion considering surface texture

Laser power modulation between disturbed and undisturbed material removal regime in laser chemical processing

Development of Polymer Hydrophobic Surfaces Through Combined Laser Ablation and Hot Embossing Processes

Contact Info

Product

Resources

About