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Influence of in situ phase formation on properties of calcium zirconate refractories

Titelangaben

Schafföner, Stefan ; Fruhstorfer, Jens ; Faßauer, Christina ; Freitag, Lisa ; Jahn, Constantin ; Aneziris, Christos G.:
Influence of in situ phase formation on properties of calcium zirconate refractories.
In: Journal of the European Ceramic Society. Bd. 37 (2017) Heft 1 . - S. 305-313.
ISSN 0955-2219
DOI: https://doi.org/10.1016/j.jeurceramsoc.2016.08.017

Abstract

This study investigates chemical, physical, mechanical, and thermomechanical properties of calcium zirconate (CaZrO3) refractories. The applied fused raw material contained some residual cubic zirconia, which impairs the corrosion resistance of CaZrO3 refractories. To adjust the stoichiometry, CaCO3 was added. Furthermore, stoichiometric amounts of CaCO3/monoclinic ZrO2 were added to promote an in situ pore formation without altering the phase composition. After firing cubic zirconia was only found in the coarse grained aggregates. CaCO3 additions increased the apparent porosity and reduced the thermal expansion coefficient due to the stoichiometric adjustment. Surprisingly, a higher porosity did not result in an improved thermal shock resistance, which can be attributed to a shift to larger pore sizes. This might cause a lower crack density, which is usually associated with a reduced thermal shock resistance. Future work will address the formation of smaller pores and the evaluation of the thermal shock resistance under practical conditions.

Weitere Angaben

Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Keywords: Calcium zirconate; Refractories; Thermal shock resistance; Elastic properties; Thermal expansion coefficient
Institutionen der Universität: Fakultäten
Fakultäten > Fakultät für Ingenieurwissenschaften
Fakultäten > Fakultät für Ingenieurwissenschaften > Lehrstuhl Keramische Werkstoffe
Fakultäten > Fakultät für Ingenieurwissenschaften > Lehrstuhl Keramische Werkstoffe > Lehrstuhl Keramische Werkstoffe - Univ.-Prof. Dr.-Ing. Stefan Schafföner
Titel an der UBT entstanden: Nein
Themengebiete aus DDC: 600 Technik, Medizin, angewandte Wissenschaften
600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften
Eingestellt am: 25 Mai 2023 07:46
Letzte Änderung: 25 Mai 2023 07:46
URI: https://eref.uni-bayreuth.de/id/eprint/76255