Mechanical properties of zirconia core-shell rods with porous core and dense shell prepared by thermoplastic co-extrusion

0480589 - ÚFM 2018 RIV GB eng J - Journal Article
Kaštyl, J. - Chlup, Zdeněk - Clemen, F. - Trunec, M.
Mechanical properties of zirconia core-shell rods with porous core and dense shell prepared by thermoplastic co-extrusion.
Journal of the European Ceramic Society. Roč. 37, č. 6 (2017), s. 2439-2447. ISSN 0955-2219. E-ISSN 1873-619X
R&D Projects: GA MŠMT(CZ) LQ1601
Institutional support: RVO:68081723
Keywords : ceramic injection moldings * oxide fuel-cells * electrophoretic deposition * large pores * alumina * fabrication * behavior * tubes * bioceramics * composites * Zirconia * Co-extrusion * Core-shell * Porous structure * Mechanical properties
OECD category: Ceramics
Impact factor: 3.794, year: 2017

Bi-layered zirconia rods of core-shell geometry with a porous core of different core porosities and a dense shell of various shell thicknesses were investigated. Core-shell structures were successfully prepared by thermoplastic co-extrusion of assembled feedrods. For comparison, non-layered rods with different porosities and tubes were also prepared. Mechanical properties of sintered core-shell rods were determined and compared with the properties of non-layered rods and tubes. Increasing porosity in the core of the core-shell rods decreased Young's modulus and the dense shell improved the fracture resistance of the core-shell rods against bending loading. The fracture force of core-shell rods was in all cases considerably higher than the fracture force of non-layered porous rods or tubes with the same Young's modulus. The fracture behaviour of core-shell rods and tubes was analysed and correlated with the calculated stress distribution in these structures. The principle of the core-shell concept was described and discussed.
Permanent Link: http://hdl.handle.net/11104/0276438