diplomsko delo
Pia Falamić (Author), Aleš Nagode (Mentor)

Abstract

Namen diplomskega dela je bila izdelava boehmita po postopku sol-gel v različnih oblikah – boehmitne prevleke in prah. Izdelali smo ga po Yoldasovem postopku, pri čemer smo uporabili aluminijev-tri-sek-butoksid, etil acetoacetat, izopropil alkohol in vodo. Na vzorcih epoksidne smole, aluminija AC50, jekla C45, titanove zlitine GR2, in stekla smo merili kot omočenja s pomočjo tenziometra in določali hidrofilnost površin. Prevleke so bile nanešene na omenjene vzorce s postopkom potapljanja in sušene v sušilniku. S sušenjem sóla in drobljenjem smo izdelali tudi prah boehmita. Za karakterizacijo prevlek in prahu smo uporabili vrstično elektronsko (SEM) mikroskopijo z energijsko disperzijsko spektroskopijo rentgenskih žarkov (EDXS). Ugotovljeno je bilo, da je sol-gel enostaven in čist postopek, ki nam omogoča pripravo raztopine pri sobni temperature. Sól je dobro omočil preiskovane materiale, izmerili smo nizke vrednosti kontaktnih kotov. Prevleki na steklu in aluminijevi zlitini sta bili brez razpok, na vzorcih titana, epoksi smole in jekla pa so bile prevleke razpokane. Debelino prevlek smo ocenili na približno 1–2 ?m. Izdelali smo prah, delce pa ocenili na velikost do 500 ?m. Prisotnost boehmita, AlO(OH), je bila na prevlekah in v prahu potrjena z EDXS analizo.

Keywords

sol-gel;boehmit;kot omočenja;prevleke;prah;SEM;

Data

Language: Slovenian
Year of publishing:
Typology: 2.11 - Undergraduate Thesis
Organization: UL NTF - Faculty of Natural Sciences and Engineering
Publisher: [P. Falamić]
UDC: 669
COBISS: 127177475 Link will open in a new window
Views: 83
Downloads: 25
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Other data

Secondary language: English
Secondary title: preparation of boehmite by sol-gel method
Secondary abstract: The purpose of the diploma thesis was the fabrication of boehmite obtained by the sol-gel method in various forms boehmite coatings and powder. It was manufactured by the Yoldas process using aluminium-tri-sec-butoxide, ethyl acetoacetate, isopropyl alcohol and water. On the samples of epoxy resin, aluminium AC50, steel C45, titanium alloy GR2 and glass contact angles were measured and determined the hydrophilicity of the surfaces. Coatings were applied by dip-coating technique and dried in the dryer. Boehmite powder was made by drying and crushing the solution. For characterization of coatings and powder we have used scanning electron microscope (SEM) with energy-dispersive X-ray spectroscopy (EDXS). It was found that sol-gel is a simple and clean process that allows us to prepare a solution at room temperature. Sól wetted the investigated materials well, we have measured low values of contact angles. The coatings on glass and aluminium alloy showed no cracks, while on the samples of titanium, epoxy resin and steel, the coatings were cracked. The thickness of the coatings was rated at approximately 1–2 m. Powder was obtained and we have rated the particles to be up to 500 m in size. The presence of boehmite, AlO(OH), was confirmed on the coatings and powder by EDXS analysis.
Secondary keywords: sol-gel;boehmite;contact angle;coatings;powder;SEM;
Type (COBISS): Bachelor thesis/paper
Study programme: 0
Embargo end date (OpenAIRE): 1970-01-01
Thesis comment: Univ. v Ljubljani, Naravoslovnotehniška fak., Oddelek za materiale in metalurgijo
Pages: XII, 54 f.
ID: 15866067