Usporedba mikrostrukture i gustoće konvencionalno i mikrovalno sinterirane Al2O3 koja sadrži otpadni prah Al2O3

master's thesis

• Title (english): Comparison of microstructure and density of conventionally and microwave sintered alumina ceramics which contains waste alumina powder
• Author: Filip Dolenčić
• Mentor: Irena Žmak (mentor)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2019-12-05, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mechanical Engineering

Abstract

U radu je prikazana priprema stabilne vodene suspenzije praha Al2O3 koji sadrži 20 % posto mase otpadnog praha Al2O3. Upotrebom sekundarnog (otpadnog) praha će se sniziti troškovi proizvodnje keramike, a u radu će se ispitati da li proizvodnja s upotrebom otpadnog praha može imati nepovoljan učinak na svojstva konačnog proizvoda aluminij oksidne keramike.
Stabilnim vodenim suspenzijama će se ispitati reološka svojstva te će se potom metodom lijevanja uliti u gipsane kalupe.
Sirovci će biti sinterirani prema zadanim parametrima u hibridnoj peći koja kombinira konvencionalno i mikrovalno zagrijavanje uzoraka. Sinteriranim uzorcima će se usporediti parametri mikrostrukture i podaci dobivenim mjerenjem Arhimedove gustoće kombinacijom konvencionalno i mikrovalno sinterirane aluminij oksidne keramike s prethodno istraženim i dobivenim rezultatima konvencionalno sinterirane aluminij oksidne keramike u svrhu potvrđivanja prednosti mikrovalnog sinteriranja, odnosno hibridnog kao što su kraće vrijeme sinteriranja, manji utrošak energije, više brzine zagrijavanja i postizanje boljih mehaničkih svojstava.

Abstract (english)

This thesis presents the preparation of a stable aqueous suspension of Al2O3 powder containing 20 % by weight of Al2O3 waste powder. The use of secondary (waste) powder will reduce the cost of production of ceramics, and the thesis will examine whether production using waste powder can have an adverse effect on the properties of the final product of aluminum oxide ceramics. Stable aqueous suspensions will test the rheological properties and then pour them into plaster molds by the slip casting method.
The raw materials will be sintered according to the default parameters in the hybrid furnace that combines conventional and microwave heating of the samples. Sintered samples will compare microstructure parameters and data obtained by measuring Archimedean density of hybrid sintered aluminum oxide ceramics with previously investigated and obtained results of conventionally sintered aluminum oxide ceramics in order to confirm the benefits of hybrid sintering such as shorter sintering time, lower energy consumption, higher heating speed and better mechanical properties.

• Keywords: aluminijev oksid; aluminij oksidna keramika; Al2O3; sinteriranje; mikrovalno sinteriranje; otpadni prah
• Keywords (english): aluminum oxide; alumina; Al2O3; sintering; microwave sintering; waste powder
• Language: croatian
• URN:NBN: urn:nbn:hr:235:561900
• Study programme: Title: Mechanical Engineering; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka strojarstva (magistar/magistra inženjer/inženjerka strojarstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2019-11-29 09:13:53