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master's thesis
Mikrovalno sinteriranje porozne aluminijeve oksidne keramike koja sadrži otpadni grafit
Zagreb: University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, 2023. urn:nbn:hr:235:630392
Medved, Marin
University of Zagreb
Faculty of Mechanical Engineering and Naval Architecture

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

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Medved, M. (2023). Mikrovalno sinteriranje porozne aluminijeve oksidne keramike koja sadrži otpadni grafit (Master's thesis). Zagreb: University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture. Retrieved from https://urn.nsk.hr/urn:nbn:hr:235:630392

Medved, Marin. "Mikrovalno sinteriranje porozne aluminijeve oksidne keramike koja sadrži otpadni grafit." Master's thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, 2023. https://urn.nsk.hr/urn:nbn:hr:235:630392

Medved, Marin. "Mikrovalno sinteriranje porozne aluminijeve oksidne keramike koja sadrži otpadni grafit." Master's thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, 2023. https://urn.nsk.hr/urn:nbn:hr:235:630392

Medved, M. (2023). 'Mikrovalno sinteriranje porozne aluminijeve oksidne keramike koja sadrži otpadni grafit', Master's thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, accessed 18 May 2024, https://urn.nsk.hr/urn:nbn:hr:235:630392

Medved M. Mikrovalno sinteriranje porozne aluminijeve oksidne keramike koja sadrži otpadni grafit [Master's thesis]. Zagreb: University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture; 2023 [cited 2024 May 18] Available at: https://urn.nsk.hr/urn:nbn:hr:235:630392

M. Medved, "Mikrovalno sinteriranje porozne aluminijeve oksidne keramike koja sadrži otpadni grafit", Master's thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, Zagreb, 2023. Available at: https://urn.nsk.hr/urn:nbn:hr:235:630392

Metadata
TitleMikrovalno sinteriranje porozne aluminijeve oksidne keramike koja sadrži otpadni grafit
Title (english)Microwave sintering of alumina ceramics witch contain waste graphite
AuthorMarin Medved
MentorLidija Ćurković (mentor)
GranterUniversity of Zagreb
Faculty of Mechanical Engineering and Naval Architecture
Zagreb
Defense date and country2023-07-20, Croatia
Scientific / art field,
discipline and subdiscipline		TECHNICAL SCIENCES
Mechanical Engineering
Abstract
U ovom radu cilj je bio istražiti mogućnost dobivanja porozne keramike metodom žrtvene faze koristeći otpadni grafit uz sinteriranje uzoraka u hibridnoj mikrovalnoj peći. Otpadni grafit korišten je jer je lako dostupan, izgara na temperaturi nižoj od temperature sinteriranja keramike i ekološki je isplativ. Uzorci su mikrovalno sinterirani jer se radi o nekonvencionalnom postupku koji je sve više u primjeni te su uspoređena svojstva materijala prije i nakon postupka sinteriranja. Pripremljene su suspenzije koje sadrže 60% Al2O3 praha sa različitim masenim udjelima otpadnog grafita od 0, 1, 5 i 10 % te dodatak disperzanta i veziva. Sirovci su dobiveni lijevanjem pripravljenih suspenzija u gipsane kalupe nakon što je suspenzija homogenizirana u planetarnom kugličnom mlinu. Kako bi se usporedila svojstva prije i nakon sinteriranja, sirovcima su izmjerene dimenzije i masa. Uslijedilo je sinteriranje u hibridnoj mikrovalnoj peći na 1600 °C. Sinteriranim uzorcima pomoću pretražnog elektronskog mikroskopa (SEM) analizirana je mikrostruktura, nakon čega su im određeni promjena mase i gustoće, poroznost i skupljanje. Na temelju dobivenih rezultata koji su prikazani u tablicama i na slikama na kraju rada doneseni su zaključci te je utvrđen utjecaj otpadnog grafita na svojstva porozne keramike sinterirane u mikrovalnoj peći.
Abstract (english)
In this study, the aim was to investigate the possibility of obtaining porous ceramics using the sacrificial phase method, by using waste graphite and sintering the samples in a hybrid microwave oven. Waste graphite was used because it is readily available, burns at a lower temperature than the ceramic sintering temperature, and is environmentally cost-effective. The samples were microwave-sintered since it is an unconventional process that is increasingly being used, and the material properties before and after the sintering process were compared. Suspensions containing 60 wt.% of Al2O3 powder with varying weight percentages of waste graphite (0%, 1%, 5%, and 10%), dispersant, and binder were prepared. The green bodies were obtained by pouring the suspension into plaster molds after homogenization in a planetary ball mill. In order to compare the properties before and after sintering, the dimensions and mass of the green bodies were measured. Subsequently, sintering was performed in a hybrid microwave oven at 1600 °C. The sintered samples were analyzed using a scanning electron microscope (SEM) to examine the microstructure, followed by measurements of mass and density change, porosity, and shrinkage. Based on the obtained results presented in tables and figures at the end of the study, conclusions were drawn regarding the influence of waste graphite on the properties of porous ceramics sintered in a hybrid microwave oven.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:235:630392
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 on2023-07-11 12:46:47