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Fabrication of ceramic coatings on the biodegradable ZM21 magnesium alloy by PEO coupled EPD followed by laser texturing process

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Journal of Magnesium and Alloys 2021年第3期9卷 910-926页

作者： Hariprasad Sampatirao Saikiran Amruthaluru Premchand Chennampalli Rama Krishna Lingamaneni Rameshbabu Nagumothu Department of Metallurgical and Materials Engineering National Institute of TechnologyTiruchirappalli 620015India Centre for Engineered Coatings International Advanced Research Centre for Powder Metallurgy and New Materials(ARCI)Hyderabad 500005India

Zirconia(ZrO_2)incorporated ceramic coatings were fabricated on biodegradable ZM21 Mg alloy by the PEO coupled with EPD process.Subsequently,the sample surface was modified by laser texturing to improve the corrosion resistance,roughness and cell proliferation and growth properties.The corrosion performance of the fabricated samples along with the substrate was studied by electrochemical measurements under simulated body fluid(SBF)environment.The cell direct contact assay was conducted for the substrate and fabricated samples using L-929 mouse fibroblast cells for 24 h.The phase contrast images of cell direct contact assay revealed that fabricated samples exhibited better contact and response with the fibroblast cells,compared to the substrate.The addition of nanoparticles in the PEO process,called PEO coupled EPD process,resulted in attaining a higher thickness and improved corrosion performance of the samples than the PEO coated samples.Among all the samples,laser surface textured PEO,and PEO-EPD coated samples unveiled enhanced corrosion resistance,cell growth,thereby enabling it as a suitable prototype for biodegradable implant applications.

关键词： ZM21 ZrO_(2)nanoparticle PEO-EPD laser texturing Corrosion resistance L-929 cells

laser texturing of Rolled Surfaces

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Tsinghua Science and Technology 2003年第2期8卷 236-240页

作者：何云峰都东刘莹岁波熊丽娟 Department of Mechanical Engineering Tsinghua UniversityBeijing 100084China The State Key Laboratory of Tribology Tsinghua UniversityBeijing 100084China

To reduce friction and improve clarity of steel surfaces, laser texturing was used to produce known surface roughness profile on rolled surfaces using a Nd:YAG laser. laser texturing process was analyzed to select the laser parameters. The surface roughness hardness and abrasion resistance were then measured and analyzed. The results show that the surface roughness is harder than the matrix, which fits for the requirements of laser texturing. The surface roughness also has good abrasion resistance. The intensity and distribution of the single pulse are the key points affecting the surface roughness profile.

关键词： laser texturing rolling surface roughness profile

Tribological behavior of polydopamine/polytetrafluoroethylene coating on laser textured stainless steel with Hilbert curves

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Friction 2023年第7期11卷 1307-1319页

作者： Firuze SOLTANI-KORDSHULI Nathaniel HARRIS Min ZOU Department of Mechanical Engineering University of ArkansasFayetteville AR 72701USA Center for Advanced Surface Engineering University of ArkansasFayetteville AR 72701USA

Shallow Hilbert curve patterns with easily programmable texture density were selected for laser texturing of stainless steel substrates.Two different texture path segment lengths(12 and 24 μm)and four different laser power percentages(5%,10%,15%,and 20%)were investigated.The textured and smooth substrates were coated with thin polydopamine/polytetrafluoroethylene(PDA/PTFE)coatings for tribological property assessment.The effects of texture density(texture area coverage)and laser power on the durability and friction of the coated surfaces were studied.laser texturing the substrates improved the coating durability up to 25 times,reduced the friction coefficient,and prevented coating global delamination.The textures fabricated with a laser power of 15%and a texture path segment length of 12 μm yielded the best coating durability.The textures provided the interlocking for the PTFE coating and thus prevented its global delamination.Furthermore,the PTFE inside the texture grooves replenished the solid lubricant worn away in the wear track and prolonged the coating wear life.

关键词： polytetrafluoroethylene(PTFE) coating durability laser texturing Hilbert curve stainless steel

Experimental investigation on anti-wear properties of laser texturing gear with bionics surface

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Experimental investigation on anti-wear properties of laser ...

Optimization of groove texture profile to improve hydrodynamic lubrication performance:Theory and experiments

The International Conference of Bionic Engineering(ICBE’06)

作者： Dong lichun Han zhiwu Cui Zhanrong Ren Luquan Key Laboratory for Terrain-Machine Bionics Engineering Ministry of Education Jinlin University Changchun 130022 P.R.China

＜正＞In order to improve the fatigue strength and service lives of gear,laser texturing experimental method was adopted,com- bining a type of bionics thought of non-smooth surface,to make micro-structural mesh on the gear surface.A couple laser tex- turing gears were fixed on gear testing device to test their wear and service lives,comparing with a couple initial untreated smooth gears. An appropriative measuring instrument for testing gear configuration and parameters was employed to examine main pa- rameters,such as dentiform error,gear direction error,of couple gear before and after the wear experiments under complete lu- brication condition,respectively.It was found from the experiments that the dentiform error and gear direction error of laser texturing gear after the experiments were decreasing mostly,but the two same type errors of the smooth couple gears were in- creasing and appearing negative value,which proved that the smooth couple gears worn away more seriously,and the couple gears with laser texturing bionics non-smooth surface were wearable relatively.

关键词： fatigue strength service lives laser texturing bionics surface dentiform error gear direction error

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Friction 2020年第1期8卷 83-94页

作者： Wei WANG Yongyong HE Jun ZHAO Junyuan MAO Yutong HU Jianbin LUO State Key Laboratory of Tribology Tsinghua UniversityBeijing 100084China Intelligent&Connected Vehicle Testing Department China Software Testing CenterBeijing 100048China

It is well known that groove texture with a careful design can be used to enhance the load‐carrying capacity of oil film under the conditions of hydrodynamic lubrication.In this study,a general parametric model was developed,and agenetic algorithm‐sequential quadratic programming hybrid method was adopted to obtain the global‐optimum profile of the groove texture.The optimized profiles at different rotating speeds are all chevrons.The numerical analysis results verified the effect of the optimization.In addition to the numerical optimization,experiments were conducted to validate the superiority of the optimized results.The experimental results show that the optimized groove texture can efficiently reduce the coefficient of friction(COF)and the temperature rise of the specimen.In particular,the optimized groove textures can achieve stable ultra‐low COF values(COF<0.01)under certain conditions.

关键词： groove texture hydrodynamic lubrication laser texturing ultra‐low coefficient of friction

Fractal Characteristic and Wear Prediction of Surface Micro-topography of laser-textured Roller

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Fractal Characteristic and Wear Prediction of Surface Micro-...