Mikrostruktura kompozitne aluminij oksidne - cirkonij oksidne keramike oblikovane lijevanjem suspenzije

undergraduate thesis

• Title (english): Microstructure of slip cast alumina - zirconia composite ceramics
• Author: Domagoj Udovičić
• Mentor: Krešimir Grilec (mentor)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2020-02-28, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mechanical Engineering

Abstract

U ovom radu istražena su svojstva i mikrostruktura kompozitne aluminij oksidne - cirkonij oksidne keramike dobivene postupkom lijevanja suspenzija. Keramički kompoziti postaju sve šire upotrebljivi materijali zbog svojih povoljnih svojstava. Jedan od bitnijih predstavnika keramičkih kompozita je upravo Al2O3 - ZrO2. Dodavanjem cirkonijeva oksida aluminijevom oksidu povećava se lomna žilavost jer je Al2O3 izrazito krhak. U radu se zaključuje da se korištenjem kompozitnih keramičkih materijala mogu dobiti povoljnija svojstva u odnosu na monolitne keramičke materijale. Pripravljene se četiri suspenzije različitog udjela Al2O3 i ZrO2: (i) čisti Al2O3, (ii) 99%Al2O3 + 1%ZrO2, (iii) 95%Al2O3 + 5%ZrO2, (iiii) 90%Al2O3 + 10%ZrO2. Suspenzije su najprije homogenizirane u planetarnom kugličnom mlinu da budu što bolje dispergirane, a zatim su tretirane u ultrazvučnoj kupelji. Nakon toga provode se reološka mjerenja na rotacijskom viskozimetru, te lijevanje suspenzija u gipsane kalupe. Potom slijedi sinteriranje, te konačno slijedi mjerenje gustoće i analiza mikrostrukture pomoću pretražnog elektronskog mikroskopa.

Abstract (english)

In this thesis properties and microstructure of composite aluminium oxide - zirconium oxide
ceramics obtained by slip casting is described. Ceramic composites are becoming more
widely used materials due to their favorable properties. Al2O3 - ZrO2 is one of the most
significant representatives of ceramic composites. With addition of zirconium oxide to
aluminium oxide, fracture toughness is increased because Al2O3 is fragile. It is concluded that
by using composite cheramic materials we can gain more favorable properties in regard to
monolithic ceramic materials.
Four groups of suspensions were prepared with different amounts of aluminium and
zirconium oxide: (i) 100%Al2O3, (ii) 99%Al2O3 + 1%ZrO2, (iii) 95%Al2O3 + 5%ZrO2, (iiii)
90%Al2O3 + 10%ZrO2. Firstly, suspensions were homogenized in a planetary ball mill to be
better dispersed, then they are treated in an ultrasonic bath. After that, rheological
measurements are conducted on rotational viscometer, as well as slip casting in gypsum
molds. This is followed by sintering, and finally density measurements, as well as
microstructure analysis by using scanning microscope are performed.

• Keywords: aluminijev oksid; cirkonijev oksid; keramički kompozit; mikrostruktura; lijevanje suspenzije
• Keywords (english): aluminium oxide; zirconium oxide; ceramic composite; microstructure; slip casting
• Language: croatian
• URN:NBN: urn:nbn:hr:235:449551
• Study programme: Title: Mechanical Engineering; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka strojarstva (sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka strojarstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2020-02-21 11:08:19