Surface micro-texture on sapphire fabricated by laser ablation trajectory regulation

Zhang, Quanli; Wang, Qiwen; Zhang, Zhen; Fu, Yucan; Xu, Jie

doi:10.1016/j.cja.2021.10.009

Cited by 8 publications

(2 citation statements)

References 25 publications

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“…The results showed that the material surface's microstructure had a significant impact on lubrication performance. Zhang et al (2022) used more advanced laser pulses to fabricate different types of microtextures on sapphire. The microtextures were applied in the fields of friction reduction and antireflection.…”

Section: Introductionmentioning

confidence: 99%

Performance analysis of columnar convex-concave compound microtexture thrust bearing

Wang,

Liu,

Duan

et al. 2024

ILT

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Purpose This study aims to enhance the lubrication performance of thrust bearings. The influence of columnar convex–concave compound microtexture on bearing performance is investigated Design/methodology/approach Based on the compound microtexture model of thrust bearings, considering surface roughness and turbulent effect, the variation of lubrication characteristics with the change in the compound microtexture parameters is studied. Findings The results indicate that, compared with circular microtexture, the maximum pressure of compound microtexture of thrust bearings increases by 7.42%. Optimal bearing performance is achieved when the internal microtexture depth is 0.02 mm. Turbulent flow states and surface roughness lead to a reduction in the optimal depth. The maximum pressure and load-carrying capacity of the bearing decrease as the initial angle increases, whereas the friction coefficient increases with the increase in the initial angle. The lubrication performance is best for bearings with a circumferential parallel arrangement of microtexture. Originality/value The novel composite microtexture with columnar convex-concave is proposed, and the computational model of thrust bearings is set. The influence of surface roughness and turbulent flow on the bearing performance should be considered for better conforming with engineering practice. The effect of microtexture depth, arrangement method and distribution position on the lubrication performance of the compound microtexture thrust bearing is investigated, which is of great significance for improving tribology, thrust bearings and surface microtexture theory.

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Section: Introductionmentioning

confidence: 99%

Performance analysis of columnar convex-concave compound microtexture thrust bearing

Wang,

Liu,

Duan

et al. 2024

ILT

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“…At present, there are different ways to reduce the friction and wear of friction pairs, mainly in advanced materials [1][2][3], surface modification [4,5], lubricants [6], etc. Surface texture as an environmentally friendly and biocompatible method in surface modification has received extensive attention in the friction field [7,8].…”

Section: Introductionmentioning

confidence: 99%

Effect of Salt Bath Nitriding and Reoxidation Composite Texture on Frictional Properties of Valve Steel 4Cr10Si2Mo

et al. 2023

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In order to improve the service life of 4Cr10Si2Mo valve steel, laser processing technology was used to prepare triangular textures with different area occupancies on the surface of 4Cr10Si2Mo, and then 4Cr10Si2Mo was subjected to salt bath nitridation (salt bath temperature 580 °C) and oxidation (oxidation temperature 400 °C). The mechanism of composite surface treatment technology on friction and wear performance of valve steel was explored. The effect of triangular texture on working surface stress and hydrodynamic pressure was explored using simulation technology, and the mechanism of texture in friction was further studied. The XRD test results showed that after salt bath nitriding and reoxidation treatment, the surface of 4Cr10Si2Mo mainly contained Fe2N oxide film and Fe3O4 and other components. The XPS test showed that the nitriding layer contained Cr-N, and the surface hardness reached 710.5 HV0.5. The simulation results showed that introducing surface texture will increase the stress on the contact surface, especially near the texture. However, under lubricating conditions, the flow field in the textured lumen produces a wedge effect, which increases the oil film pressure. After salt bath nitriding composite texture treatment, the wear resistance of 4Cr10Si2Mo significantly improved under the synergistic effect of the nitrided layer dominated by the magnetite phase (Fe3O4) and the microtexture. Fe3O4 can reduce the friction coefficient and resist oxidation reactions. In addition, the texture of the area occupancy of the texture also affects the surface tribological properties. The texture with an area occupancy rate of 11.45% (low × high is 0.3 mm × 0.3 mm) had the best anti-friction effect, and the friction coefficient reduced by 65%.

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Effect of target on micromachining of sapphire using laser-induced plasma-assisted ablation

Wen

Chen

et al. 2023

Ceramics International

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Surface micro-texture on sapphire fabricated by laser ablation trajectory regulation

Cited by 8 publications

References 25 publications

Performance analysis of columnar convex-concave compound microtexture thrust bearing

Performance analysis of columnar convex-concave compound microtexture thrust bearing

Effect of Salt Bath Nitriding and Reoxidation Composite Texture on Frictional Properties of Valve Steel 4Cr10Si2Mo

Effect of target on micromachining of sapphire using laser-induced plasma-assisted ablation

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