Izvorni znanstveni članak

https://doi.org/10.5562/cca1662

Influence of Agglomeration and Contamination in the Course of Amorphous Powder Grinding on Structure and Microstructure of Sintered Mullite

Stanislav Kurajica orcid.org/0000-0002-7066-1213 ; Faculty of Chemical Engineering and Technology, University of Zagreb, Marulićev trg 19, HR-10000 Zagreb, Croatia
Emilija Tkalčec ; Faculty of Chemical Engineering and Technology, University of Zagreb, Marulićev trg 19, HR-10000 Zagreb, Croatia
Gordana Matijašić ; Faculty of Chemical Engineering and Technology, University of Zagreb, Marulićev trg 19, HR-10000 Zagreb, Croatia
Lidija Ćurković ; Faculty of Mechanical Engineering and Naval Architecture, University of Zagreb, Ivana Lučića 5, HR-10000 Zagreb, Croatia
Zdravko Schauperl ; Faculty of Mechanical Engineering and Naval Architecture, University of Zagreb, Ivana Lučića 5, HR-10000 Zagreb, Croatia
Juraj Šipušić ; Faculty of Chemical Engineering and Technology, University of Zagreb, Marulićev trg 19, HR-10000 Zagreb, Croatia
Vilko Mandić ; Faculty of Chemical Engineering and Technology, University of Zagreb, Marulićev trg 19, HR-10000 Zagreb, Croatia

Sažetak

The process of grinding of amorphous pre-mullite powder has been investigated. The powder has
been obtained by sol-gel process followed by drying, calcination and wet milling in planetary ball mill for
various periods. While particle size distributions shifts to finer size distributions as the grinding time increase,
the specific surface area dependence on the grinding time shows complex behavior. This was attributed to the
agglomeration in the course of calcinations partially promoted by slight re-esterification of the sample surface
in the course of grinding. Mill wear debris has been observed in samples grinded for longer periods. The
influence of particle size, re-esterification, agglomeration and contamination of samples on the mullite formation
process, structure, sintering process and microstructure development, has been further investigated.
Slight changes in samples phase composition, as well as mullite structure, and the great decrease of sintered
body porosity with the duration of grinding have been observed. (doi: 10.5562/cca1662)

Ključne riječi

Mullite; sol-gel process; grinding; sintering; microstructure

Hrčak ID:

69696

URI

https://hrcak.srce.hr/69696

Datum izdavanja:

30.5.2011.

Posjeta: 2.603 *