Publication detail

Co-extrusion of zirconia core-shell rods with controlled porosity in the core

KAŠTYL, J. POUCHLÝ, V. TRUNEC, M.

Original Title

Co-extrusion of zirconia core-shell rods with controlled porosity in the core

English Title

Co-extrusion of zirconia core-shell rods with controlled porosity in the core

Type

journal article in Web of Science

Language

en

Original Abstract

A method for manufacturing bi-layered zirconia rods of core-shell geometry with a porous core and a dense shell has been developed. Core-shell rods were successfully prepared by thermoplastic co-extrusion of assembled feed rods composed of core and shell zirconia feedstocks. Rheological analysis and adjustment of the feedstock viscosities enabled co-extrusion of regular core-shell rods of uniform shell thickness. Tapioca starch was used as a pore-forming agent in the core feedstock. Binder removal and high temperature treatment had to be modified in order to safely remove the starch particles. Sintering analysis revealed constrained sintering of porous cores in the core-shell rods due to the rigid dense shell, which resulted in an increased porosity in the core. Defect-free core-shell rods with a core porosity of up to 40% and different thicknesses of the dense shell were prepared.

English abstract

A method for manufacturing bi-layered zirconia rods of core-shell geometry with a porous core and a dense shell has been developed. Core-shell rods were successfully prepared by thermoplastic co-extrusion of assembled feed rods composed of core and shell zirconia feedstocks. Rheological analysis and adjustment of the feedstock viscosities enabled co-extrusion of regular core-shell rods of uniform shell thickness. Tapioca starch was used as a pore-forming agent in the core feedstock. Binder removal and high temperature treatment had to be modified in order to safely remove the starch particles. Sintering analysis revealed constrained sintering of porous cores in the core-shell rods due to the rigid dense shell, which resulted in an increased porosity in the core. Defect-free core-shell rods with a core porosity of up to 40% and different thicknesses of the dense shell were prepared.

Keywords

core-shell, zirconia, composites, extrusion, porosity

Released

01.10.2018

ISBN

1820-6131

Periodical

Processing and Application of Ceramics

Year of study

12

Number

3

State

RS

Pages from

230

Pages to

239

Pages count

10

URL

Documents

BibTex


@article{BUT150643,
  author="Jaroslav {Kaštyl} and Václav {Pouchlý} and Martin {Trunec}",
  title="Co-extrusion of zirconia core-shell rods with controlled porosity in the core",
  annote="A method for manufacturing bi-layered zirconia rods of core-shell geometry with a porous core and a dense
shell has been developed. Core-shell rods were successfully prepared by thermoplastic co-extrusion of assembled
feed rods composed of core and shell zirconia feedstocks. Rheological analysis and adjustment of the
feedstock viscosities enabled co-extrusion of regular core-shell rods of uniform shell thickness. Tapioca starch
was used as a pore-forming agent in the core feedstock. Binder removal and high temperature treatment had to
be modified in order to safely remove the starch particles. Sintering analysis revealed constrained sintering of
porous cores in the core-shell rods due to the rigid dense shell, which resulted in an increased porosity in the
core. Defect-free core-shell rods with a core porosity of up to 40% and different thicknesses of the dense shell
were prepared.",
  chapter="150643",
  doi="10.2298/PAC1803230K",
  howpublished="print",
  number="3",
  volume="12",
  year="2018",
  month="october",
  pages="230--239",
  type="journal article in Web of Science"
}