Micro fibres containing laminates prepared by EPD: microstructure and fracture behaviour

0450363 - ÚFM 2016 RIV CH eng C - Konferenční příspěvek (zahraniční konf.)
Chlup, Zdeněk - Hadraba, Hynek - Drdlík, D. - Dlouhý, Ivo
Micro fibres containing laminates prepared by EPD: microstructure and fracture behaviour.
Electrophoretic Deposition: Fundamentals and Applications V. Zürich: Trans Tech Publications, 2015 - (Boccaccini, A.; Dickerson, J.; Ferrari, B.; Biest, O.; Uchikoshi, T.), s. 53-57. Key Engineering Materials, 654. ISBN 978-3-03835-497-0. ISSN 1013-9826.
[EPD 2014 - International Conference on Electrophoretic Deposition: Fundamentals and Applications /5./. Schloss Hernstein Hernstein (AT), 05.10.2014-10.10.2014]
Grant CEP: GA ČR(CZ) GAP108/11/1644; GA MŠMT(CZ) ED1.1.00/02.0068
Institucionální podpora: RVO:68081723
Klíčová slova: EPD * mechanical properties * composite * micro-fibres
Kód oboru RIV: JL - Únava materiálu a lomová mechanika

Recently it was possible to prepare tailored laminates with perfect and strong interface of layers with precise thickness management. Tailoring of ceramic laminates to obtain optimal mechanical properties with enhanced fracture resistance is possible when predictions based on numerical calculations are employed. Extraordinary mechanical properties were achieved via high internal stresses development during material processing. The aim of this investigation can be seen in two directions. The enhanced crack free green bodies through incorporating small volume fraction of micro-fibres to the powders were prepared. Additionally, control of the crack propagation by incorporated directionally oriented micro-fibres both in the volume and in individual layers. In this contribution both alumina and zirconia micro-fibres were used to help eliminate drying defects in the green body stage before sintering. The co-deposition of ceramic micro-fibres and powder led to the preparation of microstructures having unique orthogonal fracture properties. Developed laminate with thin layers created by zirconia micro-fibres in the alumina matrix seems to be the most promising. This type of material exhibited potential of the crack trapping and deflection even when very small amount of micro-fibres was used.
Trvalý link: http://hdl.handle.net/11104/0251832