The authors gratefully acknowledge Dr. Erich Halwax for assistance in XRD measurements, Karin Fussenegger for conduction of mercury intrusion porosimetry experiments, Jo Frank for assistance in green-body machining, as well as Prof. Noel Thomas for linguistic help with the manuscript.
Bulk Ceramic Composites Derived from a Preceramic Polysilazane with Alumina and Zirconia Fillers†
Article first published online: 21 JAN 2013
Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Advanced Engineering Materials
Volume 15, Issue 5, pages 394–406, May 2013
How to Cite
Konegger, T., Liersch, A., Gierl, C. and Scheffler, M. (2013), Bulk Ceramic Composites Derived from a Preceramic Polysilazane with Alumina and Zirconia Fillers. Adv. Eng. Mater., 15: 394–406. doi: 10.1002/adem.201200134
- Issue published online: 2 MAY 2013
- Article first published online: 21 JAN 2013
- Manuscript Accepted: 18 DEC 2012
- Manuscript Received: 4 APR 2012
Bulk composites for the production of green-machinable, complex-shaped ceramic parts with tailorable properties for applications under mechanical stress are fabricated by a novel combination of a poly(vinyl)silazane-derived ceramic matrix with Al2O3 or ZrO2 fillers. Green-machinable composites were produced by coating of the filler powders with the preceramic polymer, followed by subsequent warm-pressing. The final ceramic materials are obtained by a thermal conversion process. A systematic variation of preceramic polymer content, pressure during warm-compaction, or pyrolytic conversion temperature is used to identify the main factors responsible for differences in densification behavior, microstructure, composition, and mechanical properties. The procedure of composite powder preparation as well as the optimization of the subsequent warm-pressing step are found to be decisive in the successful production of crack-free bulk ceramic composites.