Direct Tape Casting of Nanosized Al₂O₃ Slurries Derived from Autogenous Nanomilling

Pavel Vozdecky

Department of Materials Science, Institute of Glass and Ceramics, University of Erlangen-Nuremberg, 91058 Erlangen, Germany

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Andreas Roosen,

Corresponding Author

Andreas Roosen

Department of Materials Science, Institute of Glass and Ceramics, University of Erlangen-Nuremberg, 91058 Erlangen, Germany

^*Member, The American Ceramic Society.

^†Author to whom correspondence should be addressed. e-mail: [email protected]Search for more papers by this author

Catharina Knieke,

Catharina Knieke

Department of Chemical and Biological Engineering, Institute of Particle Technology, University of Erlangen-Nuremberg, 91058 Erlangen, Germany

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Wolfgang Peukert,

Wolfgang Peukert

Department of Chemical and Biological Engineering, Institute of Particle Technology, University of Erlangen-Nuremberg, 91058 Erlangen, Germany

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Pavel Vozdecky,

Pavel Vozdecky

Department of Materials Science, Institute of Glass and Ceramics, University of Erlangen-Nuremberg, 91058 Erlangen, Germany

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Andreas Roosen,

Corresponding Author

Andreas Roosen

Department of Materials Science, Institute of Glass and Ceramics, University of Erlangen-Nuremberg, 91058 Erlangen, Germany

^*Member, The American Ceramic Society.

^†Author to whom correspondence should be addressed. e-mail: [email protected]Search for more papers by this author

Catharina Knieke,

Catharina Knieke

Department of Chemical and Biological Engineering, Institute of Particle Technology, University of Erlangen-Nuremberg, 91058 Erlangen, Germany

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Wolfgang Peukert,

Wolfgang Peukert

Department of Chemical and Biological Engineering, Institute of Particle Technology, University of Erlangen-Nuremberg, 91058 Erlangen, Germany

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First published: 26 April 2010

https://doi.org/10.1111/j.1551-2916.2009.03597.x

Citations: 22

J. Blendell—contributing editor

This work was financially supported by the Arbeitsgemeinschaft industrieller Forschungsvereinigungen “Otto von Guericke” e.V. (AiF-ZUTECH, 194 ZN).

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Abstract

Nanoparticles offer many advantages in the manufacture of ceramic products concerning processing and final properties, but are still difficult to process, and not all ceramic powder compositions can be obtained commercially like, e.g., α-alumina. In this paper, the production of α-alumina nanosized particles with a median size <60 nm by a wet grinding process in a highly concentrated suspension of up to 49 wt% solid content starting from a commercial microsized powder is presented. Furthermore, the subsequent direct processing of these suspensions to ceramic green tapes via tape casting is performed. The effect of nanosized α-Al₂O₃ powders on the viscosity of slurries, the casting process, binder burnout, and sintering behavior is characterized. Flat and crack-free sintered substrates with a density >95%TD, a submicrometer microstructure, and a translucent appearance could be obtained. A decrease of the sintering temperature, an improvement of the mechanical strength, and a lower surface roughness were achieved through the use of nanoparticles compared with particles in the micrometer size range.

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Direct Tape Casting of Nanosized Al₂O₃ Slurries Derived from Autogenous Nanomilling

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Direct Tape Casting of Nanosized Al₂O₃ Slurries Derived from Autogenous Nanomilling