As a simple,reproducible,and pollution-free technique with the potential of integration and automation,laser processing has attracted increasing attention.Laser processing,which includes laser polishing,laser cleaning...As a simple,reproducible,and pollution-free technique with the potential of integration and automation,laser processing has attracted increasing attention.Laser processing,which includes laser polishing,laser cleaning,and fabrication of laser-induced micro-/nano-structures,has been demonstrated to yield smooth,clean,functional surfaces and effective joining.Laser polishing is an advanced,highly efficient,and ecofriendly polishing technology.This study demonstrated the laser polishing of a selective laser-melted Inconel 718(IN718)superalloy and a titaniumalloy sample.The surface roughnesses Ra and Rz of the IN718 superalloy were respectively reduced from 8 and 33μm to 0.2 and 0.8μm,and the Ra of the titanium alloy was reduced from 9.8μm to 0.2μm.Moreover,the wear resistance and corrosion resistance of the IN718 were apparently improved.As another surface-related processingmethod,laser cleaningwas used to clean terminal blocks.Almost all the contaminants were removed,as verified by the absence of their chemical compositions and the decreased surface roughness.In addition,a superhydrophobic surface with a contact angle of over 160°and sliding angle of b8°on stainless steel was obtained by laser texturing treatment.These results demonstrate the high potential of laser processing in the scientific,technological,and industrial fields.展开更多
Although laser ablation is considered as a facile technique to fabricate bio-inspired super-hydrophobic surfaces,the issue is that the initial laser treated metallic surfaces show super-hydrophilic property.It will ta...Although laser ablation is considered as a facile technique to fabricate bio-inspired super-hydrophobic surfaces,the issue is that the initial laser treated metallic surfaces show super-hydrophilic property.It will take a long period to reach super-hydrophobic state under ambient air.It is reported that these super-hydrophobic surfaces could be easily damaged by thermal heating effect or interaction with other liquids,causing uncontrolled loss of super-hydrophobicity.In this study,a stable super-hydrophobic aluminum surface was rapidly fab-ricated via the hybrid laser ablation and surface chemical modification of(heptadecafluoro-1,1,2,2-tetradecyl)triethoxysilane(AC-FAS).Surface morphology and chemistry were systematically investigated to explore the generation mechanism of super-hydrophobicity.The water contact angle of the treated surfaces can reach up to 160.6°±1.5°with rolling angle of 3.0°±1.0°,exhibiting perfect self-cleaning capability,long-term stability,and excellent chemical stability in acidic as well as alkaline solutions.The potentiodynamic polarization tests implied that the super-hydrophobic surfaces showed better anti-corrosion performance.This hybrid laser ablation and surface chemical modification are very time-saving and low-cost,which offers a rapid way for quantity production of super-hydrophobic surface on aluminum material.展开更多
基金National Key Research and Development Program of China under Grant 2018YFB1107700,2018YFB1107400,and 2016YFB1102503National Key Basic Research Program of China under Grant 2015CB059900+1 种基金National Natural Science Foundation of China under Grant 51705013Beijing Natural Science Foundation under Grant J170002.
文摘As a simple,reproducible,and pollution-free technique with the potential of integration and automation,laser processing has attracted increasing attention.Laser processing,which includes laser polishing,laser cleaning,and fabrication of laser-induced micro-/nano-structures,has been demonstrated to yield smooth,clean,functional surfaces and effective joining.Laser polishing is an advanced,highly efficient,and ecofriendly polishing technology.This study demonstrated the laser polishing of a selective laser-melted Inconel 718(IN718)superalloy and a titaniumalloy sample.The surface roughnesses Ra and Rz of the IN718 superalloy were respectively reduced from 8 and 33μm to 0.2 and 0.8μm,and the Ra of the titanium alloy was reduced from 9.8μm to 0.2μm.Moreover,the wear resistance and corrosion resistance of the IN718 were apparently improved.As another surface-related processingmethod,laser cleaningwas used to clean terminal blocks.Almost all the contaminants were removed,as verified by the absence of their chemical compositions and the decreased surface roughness.In addition,a superhydrophobic surface with a contact angle of over 160°and sliding angle of b8°on stainless steel was obtained by laser texturing treatment.These results demonstrate the high potential of laser processing in the scientific,technological,and industrial fields.
基金Program of International S&T Cooperation(No.2016YFE0112100)National Key R&D Program of China(No.2017YFBl104700)+1 种基金H2020 Project(FabSurfWAR-644971)National Natural Science Foundations of China(Nos.51675371,51675376 and 51675367).
文摘Although laser ablation is considered as a facile technique to fabricate bio-inspired super-hydrophobic surfaces,the issue is that the initial laser treated metallic surfaces show super-hydrophilic property.It will take a long period to reach super-hydrophobic state under ambient air.It is reported that these super-hydrophobic surfaces could be easily damaged by thermal heating effect or interaction with other liquids,causing uncontrolled loss of super-hydrophobicity.In this study,a stable super-hydrophobic aluminum surface was rapidly fab-ricated via the hybrid laser ablation and surface chemical modification of(heptadecafluoro-1,1,2,2-tetradecyl)triethoxysilane(AC-FAS).Surface morphology and chemistry were systematically investigated to explore the generation mechanism of super-hydrophobicity.The water contact angle of the treated surfaces can reach up to 160.6°±1.5°with rolling angle of 3.0°±1.0°,exhibiting perfect self-cleaning capability,long-term stability,and excellent chemical stability in acidic as well as alkaline solutions.The potentiodynamic polarization tests implied that the super-hydrophobic surfaces showed better anti-corrosion performance.This hybrid laser ablation and surface chemical modification are very time-saving and low-cost,which offers a rapid way for quantity production of super-hydrophobic surface on aluminum material.