Mechanical properties of zirconia core-shell rods with porous core and dense shell prepared by thermoplastic co-extrusion. Issue 6 (June 2017)

• Record Type: Journal Article
• Authors: Kastyl, Jaroslav; Chlup, Zdenek; Clemens, Frank; Trunec, Martin
• Is Part Of: Journal of the European Ceramic Society. Volume 37:Issue 6(2017)
• Page Start: 2439
• Page End: 2447
• Publication Date: 2017-06
• Subjects: Zirconia -- Co-extrusion -- Core-shell -- Porous structure -- Mechanical properties; Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2017.02.006
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: 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.