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

0434894 - ÚFM 2015 RIV US eng A - Abstrakt
Chlup, Zdeněk - Hadraba, Hynek - Drdlík, D.
Micro fibres containing laminates prepared by EPD: microstructure and fracture behaviour.
Electrophoretic Deposition: Fundamentals and Applications. New York: ECI, 2014.
[International Conference on Electrophoretic Deposition: Fundamentals and Applications /5./. 05.10.2014-10.10.2014, Hernstein]
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

Electrophoretic deposition is an excellent tool for preparation of sophisticated structures like laminates. 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 is employed. Extraordinary mechanical properties was 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 of micro-fibres to the powders. Additionally, control of the crack propagation by directionally oriented incorporated micro-fibres both in the volume and in individual layers. In this contribution both alumina and zirconia micro-fibres are 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 crack trapping and deflection even when very small amount of micro-fibres was used.
Trvalý link: http://hdl.handle.net/11104/0239581