prikaz prve stranice dokumenta Reološka svojstva Al2O3 suspenzija koje sadrže biootpad
  Download
PDF 2.93 MB
master's thesis
Reološka svojstva Al2O3 suspenzija koje sadrže biootpad
Zagreb: University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, 2021. urn:nbn:hr:235:896483
Udovičić, Domagoj
University of Zagreb
Faculty of Mechanical Engineering and Naval Architecture

Institutional repository: Repository of Faculty of Mechanical Engineering and Naval Architecture University of Zagreb

Cite this document

Udovičić, D. (2021). Reološka svojstva Al2O3 suspenzija koje sadrže biootpad (Master's thesis). Zagreb: University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture. Retrieved from https://urn.nsk.hr/urn:nbn:hr:235:896483

Udovičić, Domagoj. "Reološka svojstva Al2O3 suspenzija koje sadrže biootpad." Master's thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, 2021. https://urn.nsk.hr/urn:nbn:hr:235:896483

Udovičić, Domagoj. "Reološka svojstva Al2O3 suspenzija koje sadrže biootpad." Master's thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, 2021. https://urn.nsk.hr/urn:nbn:hr:235:896483

Udovičić, D. (2021). 'Reološka svojstva Al2O3 suspenzija koje sadrže biootpad', Master's thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, accessed 13 July 2024, https://urn.nsk.hr/urn:nbn:hr:235:896483

Udovičić D. Reološka svojstva Al2O3 suspenzija koje sadrže biootpad [Master's thesis]. Zagreb: University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture; 2021 [cited 2024 July 13] Available at: https://urn.nsk.hr/urn:nbn:hr:235:896483

D. Udovičić, "Reološka svojstva Al2O3 suspenzija koje sadrže biootpad", Master's thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, Zagreb, 2021. Available at: https://urn.nsk.hr/urn:nbn:hr:235:896483

Metadata
TitleReološka svojstva Al2O3 suspenzija koje sadrže biootpad
Title (english)Rheological properties of Al2O3 suspensions which contain biowaste
AuthorDomagoj Udovičić
MentorLidija Ćurković (mentor)
GranterUniversity of Zagreb
Faculty of Mechanical Engineering and Naval Architecture
Zagreb
Defense date and country2021-12-16, Croatia
Scientific / art field,
discipline and subdiscipline		TECHNICAL SCIENCES
Mechanical Engineering
General Mechanical Engineering (Construction)
Abstract
U ovom radu ispitana je mogućnost uporabe dodatka otpadnog taloga kave za pripravu porozne Al2O3 keramike lijevanjem suspenzije (engl. slip casting) u gipsani kalup. Otpadni talog kave je pogodan materijal u metodi sa žrtvenom fazom jer se sastoji većinski od organskih materijala, jeftin je i ekološki prihvatljiv. U tu svrhu pripravljeno je pet 60 %–tnih Al2O3 suspenzija s masenim udjelom 0, 1, 5, 10 i 15 % otpadnog taloga kave, uz dodatke disperzanta Dolapixa (0,2 %) i veziva PVA (0,5 %). Suspenzije su pripravljene homogenizacijom u planetarnom kugličnom mlinu, nakon čega su im određena reološka svojstva na rotacijskom viskozimetru. Reološka svojstva keramičkih suspenzija određena su snimanjem krivulja tečenja (reoloških dijagrama): dijagram ovisnosti prividne viskoznosti (η) o brzini smicanja (γ), te dijagram ovisnosti smičnog naprezanja (τ) o brzini smicanja (γ). Lijevanjem pripravljenih suspenzija u gipsani kalup oblikovani su sirovci Al2O3 keramike s masenim udjelom 0, 1, 5, 10 i 15 % otpadnog taloga kave. Sirovci su sinterirani u laboratorijskoj električnoj peći uz odgovarajući režim sinteriranja pri 1600 °C. Sinteriranim uzorcima analizirana je mikrostruktura pretražnim elektronskim mikroskom (SEM) te je određena gustoća, poroznost i skupljanje.
Abstract (english)
In this thesis, the use of spent coffee grounds for preparation of porous Al2O3 ceramics by slip casting into gypsum mold is investigated. Spent coffee grounds can be used in sacrificial template method because they consist mostly of organic materials, they are cheap and environmentally friendly. For this purpose, five 60 wt. % Al2O3 suspensions of with a mass fraction of 0, 1, 5, 10 and 15 wt. % of spent coffee grounds were prepared, with the addition of the dispersant Dolapix (0.2 wt. %) and PVA binder (0.5 wt. %). The suspensions were homogenized in a planetary ball mill, after which their rheological properties were determined on a rotational viscometer. The rheological properties of ceramic suspensions were determined by recording flow curves (rheological diagrams): the dependence of the apparent viscosity (η) on the shear rate (γ), and the dependence of the shear stress (τ) on the shear rate (γ). By slip casting of prepared suspensions in gypsum mold, green bodies of Al2O3 ceramic materials with a mass fraction of 0, 1, 5, 10 and 15 wt. % of spent coffee grounds were formed. The green bodies were sintered in laboratory electric kiln with an appropriate sintering regime at 1600 °C. The microstructure of sintered samples was analyzed by scanning electron microscopy (SEM), as well as density, porosity and shrinkage were determined.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:235:896483
Study programmeTitle: Mechanical Engineering
Study programme type: university
Study level: graduate
Academic / professional title: magistar/magistra inženjer/inženjerka strojarstva (magistar/magistra inženjer/inženjerka strojarstva)
Type of resourceText
File originBorn digital
Access conditionsOpen access
Terms of useLicence In copyright icon
Created on2021-12-07 11:16:51