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Karakterizacija superomočljivosti površin po laserskem teksturiranju
Zajc, Maks (Author), Gregorčič, Peter (Mentor) More about this mentor... This link opens in a new window

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Abstract
Omočljivost površin je ena izmed pomembnejših lastnosti površine. Njeno vrednotenje in spreminjanje nam omogoča, da tako funkcionalizirane površine uporabimo na različnih inženirskih področjih. V tej zaključni nalogi se osredotočimo na vrednotenje površin po laserskem teksturiranju, ki je potekalo v treh različnih atmosferah: zrak, argon in dušik. Najprej smo pregledali literaturo na področju karakterizacije superomočljivih površin. Nato smo omočljivost površin, ki smo jih predhodno lasersko teksturirali, karakterizirali z metodo praznjenja kapilar. Za merjenje omočljivosti smo uporabili vodo in etanol. Z nanosekundnim vlakenskim laserjem (valovna dolžina 1060 nm) smo procesirali šest polj na nerjavnem jeklu, pri čemer smo vsako polje procesirali z drugačnim razmikom med procesirnimi linijami in/ali z drugačno povprečno močjo laserskega snopa. Vzorci so s časom postajali vse bolj hidrofobni, a so ves čas ostali higrofilni. Opazili smo, da imajo polja s podobnimi vrednostmi celotne energije, ki jo z laserskimi bliski dovedemo na površino, drugačne omočljivosti. Velik vpliv pa ima tudi atmosfera, v kateri vzorce procesiramo, saj meritve pokažejo velike razlike v omočljivosti polj z enakimi procesirnimi parametri (v različnih atmosferah). Ključna ugotovitev naloge je, da se z nanosekundnim vlakenskim laserjem lahko teksturira superhigrofilne površine, ki ostanejo takšne dlje časa.

Language:Slovenian
Keywords:omočljivost površin, lasersko teksturiranje površin, laserske obdelave, vlakenski laserji, laserski inženiring površin, funkcionalizacija površin
Work type:Final paper (mb12)
Tipology:2.11 - Undergraduate Thesis
Organization:FS - Faculty of Mechanical Engineering
Year:2019
Publisher:[M. Zajc]
Number of pages:XV, 38 f.
UDC:621.9.048.7:544.537(043.2)
COBISS.SI-ID:16619547 Link is opened in a new window
Views:158
Downloads:63
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Secondary language

Language:English
Title:Characterization of surface superhydrophilicity after laser texturing
Abstract:
Surface wettability is one of the most important surface properties. Its characterisation and modification enables us to use functional surfaces in different engineering applications. In this thesis, we focus on characterization of surface wettability after laser texturing in three different atmospheres: air, argon and nitrogen. We made a detailed revew of the literature in the field of different methods for characterization of superhydrophobic surfaces. Further, the wettability of laser textured surfaces was characterized by using the capillary emptiying method. We used water and ethanol to fill the capillary. We processed six areas of stainless steel by using a nanosecond fiber laser (wavelength of 1060 nm). Within each area, we have changed the scan line separation and/or average power of the laser beam. Samples became more hydrophobic over time, but stayed hygrophilic. Our resoults show, that areas with similar energy per area, express different wettability. The results show that the processing atmosphere, has significant influence on the surface wettability of the areas, processed with the same laser parameters. The key finding for this thesis is that it is possible to produce superhygrophilic surfaces by using a nanosecond fiber laser and that such surface, stays superhygrophilic by time.

Keywords:surface wettability, laser surface texturing, laser material processing, fiber lasers, laser surface engineering, surface functionalization

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