diplomsko delo
Blažka Zemljič (Author), Jože Medved (Mentor)

Abstract

Aluminij je drugi najpomembnejši kovinski material, takoj za železom. Ima nizko gostoto, dobre mehanske lastnosti, visoko duktilnost, dobro korozijsko odpornost ter dobro toplotno in električno prevodnost. Primarni aluminij se pridobiva z elektrolizno redukcijo. Elektrolizna redukcija je energetsko intenziven postopek. Reciklaža in ponovna uporaba aluminija in njegovih zlitin je popolna pri majhni porabi energije. Recikliran aluminij ima lahko enako dobre lastnosti kot primarni. Aluminijeve zlitine skupine 6xxx, ki spadajo med zmerno trdne, imajo dobro korozijsko odpornost, dajo se toplotno obdelovati in se lahko uporabljajo za različne aplikacije. Namen diplomskega dela je bil proučiti vpliv deleža sekundarnega aluminija na potek strjevanja zlitine AA6082. Izdelali smo pet eksperimentalnih vzorcev, in sicer: z 0, s 25, 50, 75 in 100 mas. % sekundarne aluminijeve zlitine AA6082. Zlitino smo stalili v indukcijski peči in jo ulili v merilno celico enostavne termične analize (ETA). Iz ohlajevalnih krivulj smo zasledovali potek strjevanja. Izdelano zlitino smo preiskali še z rentgensko fluorescenčno analizo (XRF), diferenčno vrstično kalorimetrijo (DSC) ter naredili termodinamični izračun. Po opravljenih preizkusih smo primerjali ohlajevalne krivulje posameznih zlitin, ogrevalne in ohlajevalne krivulje DSC-analize ter rezultate rentgenske fluorescenčne analize. Ugotovili smo, da se vzorec s 25 mas. % sekundarnega materiala strjuje najhitreje, najpočasneje pa vzorec s 100 mas. %. Ugotovili smo, da se največ talilne entalpije porabi pri vzorcu s 100 mas. % primarnega materiala.

Keywords

zlitina AA6082;reciklaža;taljenje in litje v vakuumu;termodinamika;termična analiza;

Data

Language: Slovenian
Year of publishing:
Typology: 2.11 - Undergraduate Thesis
Organization: UL NTF - Faculty of Natural Sciences and Engineering
Publisher: [B. Zemljič]
UDC: 669
COBISS: 1778271 Link will open in a new window
Views: 770
Downloads: 292
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Other data

Secondary language: English
Secondary title: influence of secondary aluminium amount on solidification of 6082 alloy
Secondary abstract: Aluminium is the second most important metal, following iron. It has low density, good mechanical properties, high ductility, good corrosion resistance and good heat and electrical resistance. Primarily aluminum is produced by electrolityc reduction. Electrolityc reduction is an energy-intensive process. Recycling and reuse of aluminum and its alloys is perfect, and with low energy consumption. Recycled aluminum has the same good properties as the primary one. Aluminium alloys of the group 6xxx, which are considered to be relatively hard, has good corrosion resistance, can be thermally processed and can be used in multitude of different applications. The purpose of the diploma work is to study the influence of secondary aluminium's quantity on the course of the solidification of alloy AA6082. The experiment will include five different samples i.e. 0, 25, 50, 75 and 100 wt. % secondary aluminium alloy AA6082. We melted the alloy with an induction furnace and poured it inside a simple thermal analysis' measuring container. From the cooling curves we followed the curing process. The refined alloy was then closely studied with an X-ray fluorescence analysis (XRF), a differential scanning calorimetry (DSC) and thermodynamic calculation. After completing the experiments we compared the cooling curves of individual alloys, the heating and cooling curves of the DSC analysis and the results of the X-ray fluorescence analysis. The results showed that the 25 wt. % of secondary material sample had the highest coagulation rate, while the 100 wt. % had the slowest coagulation rate. We also discovered that the the most melting enthalpy was used by the 100 wt. % of the primary material.
Secondary keywords: alloy AA6082;recycling;melting and casting in a vacuum;thermodynamics;thermal analysis;
Type (COBISS): Final paper
Study programme: 0
Thesis comment: Univ. v Ljubljani, Naravoslovnotehniška fak. , Odd. za materiale in metalurgijo
Pages: X, 41 f.
ID: 10999340