Publication result 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

WoS Article

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

Key words in English

core-shell, zirconia, composites, extrusion, porosity

Authors

KAŠTYL, J.; POUCHLÝ, V.; TRUNEC, M.

RIV year

2019

Released

01.10.2018

ISBN

1820-6131

Periodical

Processing and Application of Ceramics

Volume

12

Number

3

State

Republic of Serbia

Pages from

231

Pages to

240

Pages count

10

URL

http://www.tf.uns.ac.rs/publikacije/PAC/pdf/PAC%2041%2004.pdf

Full text in the Digital Library

http://hdl.handle.net/11012/214124

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",
  journal="Processing and Application of Ceramics",
  year="2018",
  volume="12",
  number="3",
  pages="231--240",
  doi="10.2298/PAC1803230K",
  issn="1820-6131",
  url="http://www.tf.uns.ac.rs/publikacije/PAC/pdf/PAC%2041%2004.pdf"
}

Documents

PAC_41_04