Publication detail

Densification of fine-grained alumina ceramics doped by magnesia, yttria and zirconia evaluated by two different sintering models

MACA, K. POUCHLÝ, V. BODIŠOVÁ, K. ŠVANCÁREK, P. GALUSEK, D.

Original Title

Densification of fine-grained alumina ceramics doped by magnesia, yttria and zirconia evaluated by two different sintering models

English Title

Densification of fine-grained alumina ceramics doped by magnesia, yttria and zirconia evaluated by two different sintering models

Type

journal article in Web of Science

Language

en

Original Abstract

The influence of various dopants (500 ppm MgO and Y2O3;250 ppm ZrO2) on sintering of fine-grained alumina ceramics was evaluated by high-temperature dilatometry. The apparent activation energy of sintering was estimated with the help of Master Sintering Curve and a model proposedby Wang and Raj. The densification kinetics was controlled by at least two mechanisms operating at low (higher activation energy) and high (loweractivation energy) densities. Good agreement between the activation energies calculated with both models was observed for low as well as forhigh densities. The lowest value of activation energy exhibited undoped alumina; the addition of MgO resulted in slight increase of the activationenergy. Y2O3and ZrO2significantly inhibited the densification, which was reflected in the higher sintering activation energies. The low activationenergies in the final sintering step indicates the importance of proper choice of sintering temperature, namely in the two-step sintering process.

English abstract

The influence of various dopants (500 ppm MgO and Y2O3;250 ppm ZrO2) on sintering of fine-grained alumina ceramics was evaluated by high-temperature dilatometry. The apparent activation energy of sintering was estimated with the help of Master Sintering Curve and a model proposedby Wang and Raj. The densification kinetics was controlled by at least two mechanisms operating at low (higher activation energy) and high (loweractivation energy) densities. Good agreement between the activation energies calculated with both models was observed for low as well as forhigh densities. The lowest value of activation energy exhibited undoped alumina; the addition of MgO resulted in slight increase of the activationenergy. Y2O3and ZrO2significantly inhibited the densification, which was reflected in the higher sintering activation energies. The low activationenergies in the final sintering step indicates the importance of proper choice of sintering temperature, namely in the two-step sintering process.

Keywords

Sintering; Alumina; Activation energy

RIV year

2014

Released

01.12.2014

ISBN

0955-2219

Periodical

Journal of the European Ceramic Society

Year of study

34

Number

16

State

GB

Pages from

4363

Pages to

4372

Pages count

10

Documents

BibTex


@article{BUT109753,
  author="Karel {Maca} and Václav {Pouchlý} and Katarina {Drdlíková} and Peter {Švancárek} and Dušan {Galusek}",
  title="Densification of fine-grained alumina ceramics doped by magnesia, yttria and zirconia evaluated by two different sintering models",
  annote="The influence of various dopants (500 ppm MgO and Y2O3;250 ppm ZrO2) on sintering of fine-grained alumina ceramics was evaluated by high-temperature dilatometry. The apparent activation energy of sintering was estimated with the help of Master Sintering Curve and a model proposedby Wang and Raj. The densification kinetics was controlled by at least two mechanisms operating at low (higher activation energy) and high (loweractivation energy) densities. Good agreement between the activation energies calculated with both models was observed for low as well as forhigh densities. The lowest value of activation energy exhibited undoped alumina; the addition of MgO resulted in slight increase of the activationenergy. Y2O3and ZrO2significantly inhibited the densification, which was reflected in the higher sintering activation energies. The low activationenergies in the final sintering step indicates the importance of proper choice of sintering temperature, namely in the two-step sintering process.",
  chapter="109753",
  doi="10.1016/j.jeurceramsoc.2014.06.030",
  number="16",
  volume="34",
  year="2014",
  month="december",
  pages="4363--4372",
  type="journal article in Web of Science"
}