Improving hydrophobicity of laser textured SiC surface with micro-square convexes

Ma, Chao; Bai, Shaoxian; Peng, Xudong; Meng, Yonggang

doi:10.1016/j.apsusc.2012.11.068

Cited by 49 publications

(27 citation statements)

References 14 publications

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“…Considering that tens of microns is a typical dimension of laser-processed micro-structures on seal faces to improve tribological and sealing performance [11,14], we designed the feature sizes of a circle dimple and square-convex at tens of microns and emphasized the difference in wetting behaviors on these two textured surfaces.…”

Section: Methodsmentioning

confidence: 99%

“…Tseng et al [10] experimentally showed that circle-dimpled morphology can enhance the hydrophilicity of silicon surfaces, decreasing contact angles from 47.9° to 0° in a very short time. Ma et al [11,12] and He et al [13] reported that micro-square-convex topography can reinforce both surface hydrophobicity and surface hydrophilicity. However, the extent of the influence of circle-dimpled and microsquare-convex morphology, which have the same micro sizes, on the same material surface wettability has not been studied previously.…”

Section: Introductionmentioning

confidence: 97%

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Influence of laser geometric morphology type on SiC surface wettability

Wang

Bai

2015

Sci. China Technol. Sci.

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To obtain effective surface morphology to control surface wettability, this work investigated the influence of protuberant and concave morphology, which are respectively represented by circle-dimpled and micro-square-convex morphology, on surface wettability. The geometric morphologies were processed on silicon carbide (SiC) surfaces by a laser-marking machine, and surface wettability was monitored by the measurement of contact angles using the sessile drop method. Correlation analysis between contact angles and morphology parameters was conducted to determine the extent of influence. The results showed that the circle-dimpled diameter had a significant influence on surface wettability, whereas grooved width did not. Additionally, the depth of dimples and grooves exerted less influence on controlling wetting behaviors. In addition, surface wettability transformed from a superhydrophilic state to a hydrophobic state on micro-square-convex surfaces; contact angles on circle-dimpled surfaces showed a relatively slow transformation, though the surface wettability also underwent the state change.circle-dimpled morphology, micro-square-convex morphology, wettability, SiC Citation:Wang R, Bai S X. Influence of laser geometric morphology type on SiC surface wettability.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

Influence of laser geometric morphology type on SiC surface wettability

Wang

Bai

2015

Sci. China Technol. Sci.

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“…The other mechanisms, besides a micro-hydrodynamic pressure build-up and cavitation, postulated in the literature, possibly responsible for reducing friction and wear by a morphological surface texture, are a change in contact angle due to the altered surface morphology [34], the trapping of wear particles [35] and the possible storage of lubricant inside the dimples [36]. None of these mechanisms are expected to be decisively impacted by a variation in aspect ratio, permitting to focus the discussion on fluid dynamic effects.…”

Section: Discussionmentioning

confidence: 99%

Laser Textured Surfaces for Mixed Lubrication: Influence of Aspect Ratio, Textured Area and Dimple Arrangement

2017

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Abstract:Unidirectional sliding experiments with polished and laser textured steel surfaces were carried out to investigate the effects of different textured area densities, aspect ratios and dimple arrangements. The system was lubricated with Polyalphaolefin (PAO) at 100 °C and the contact pressure was 3 MPa. For measuring Stribeck curves, the sliding speed was controlled between 40 and 2000 mm/s. The textured area density was varied between 5% and 30%, with the lowest friction values found for 10%. Aspect ratios ranging from 0.02 to 0.2 were investigated and for 0.1 the lowest friction values were measured. The dimple arrangements tested were cubic, hexagonal and a random distribution for a textured area density of 10% and an aspect ratio of 0.1. Our results demonstrate that the dimple arrangement does affect friction values, hinting to the fact that individual texture elements do influence each other. The optimum dimple arrangement was found in a hexagonal packing. This systematic variation of these three key texturing parameters for the morphological texturing of a tribological surface with dimples will allow a strategic choice of texturing parameters. This makes the most of the tremendous potential that laser surface texturing has for reducing friction forces and thereby CO2 emissions.

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“…Many researches about laser-induced hydrophobic surface have been reported in various literatures [18][19][20], but the specific reason for the change of surface wettability after laser processing has no comprehensive research. In this paper, nanosecond laser is used to fabricate patterned microstructures on the surface of titanium, including line pattern, grid pattern and spot pattern.…”

Section: Introductionmentioning

confidence: 99%

“…Luo et al [18] machined micro-patterns on 316 stainless steel by a short pulse excimer laser, and the contact angle increased from 68.5º to 130º . Chunhong et al [19] investigated surface microstructuring of SiC material using fiber optic laser, and found that contact angle varied from 89.8º to 119º . Jagdheesh [20] studied the wetting behavior of laser-induced micropatterns on alumina.…”

Section: Introductionmentioning

confidence: 99%

Modification of wettability property of titanium by laser texturing

Yang

Mei

Tian

et al. 2016

Int J Adv Manuf Technol

112

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Three different microstructures with line pattern, grid pattern and spot pattern were fabricated on titanium surfaces by nanosecond laser. Scanning electron microscopy (SEM), contact angle measurement, surface roughness gauge and X-ray photoelectron spectroscopy (XPS) analysis were used to characterize and measure the surface morphology, contact angle, surface roughness and chemical composition of titanium after laser processing. The results indicate that the contact angle of titanium surface is 77.8º immediately after laser processing, which shows hydrophilicity, and the contact angle presents a rising tendency with time in general. At steady state, the maximum contact angles for line pattern, grid pattern and spot pattern increased to 157.2º , 153º and 132.5º , respectively. It can be found that the surface wettability has changed from hydrophilicity to hydrophobicity and even to superhydrophobicity. The influence of surface morphology on the surface wettability effects immediately after laser treatment and does not change with time, while the effect of surface chemical composition on the surface wettability will continue from the beginning of laser processing to the stabilization of surface chemical composition. Finally, it can be deduced that the accumulation of carbon on the surface is probably the critical factor to improve the surface hydrophobicity. Therefore, it is concluded that laser-induced modification of surface wettability correlates with surface morphology and surface chemical composition.

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Improving hydrophobicity of laser textured SiC surface with micro-square convexes

Cited by 49 publications

References 14 publications

Influence of laser geometric morphology type on SiC surface wettability

Influence of laser geometric morphology type on SiC surface wettability

Laser Textured Surfaces for Mixed Lubrication: Influence of Aspect Ratio, Textured Area and Dimple Arrangement

Modification of wettability property of titanium by laser texturing

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