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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
Type
journal article in Web of Science
Language
English
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.
Keywords
Sintering; Alumina; Activation energy
Authors
MACA, K.; POUCHLÝ, V.; BODIŠOVÁ, K.; ŠVANCÁREK, P.; GALUSEK, D.
RIV year
2014
Released
1. 12. 2014
ISBN
0955-2219
Periodical
Journal of the European Ceramic Society
Year of study
34
Number
16
State
United Kingdom of Great Britain and Northern Ireland
Pages from
4363
Pages to
4372
Pages count
10
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", journal="Journal of the European Ceramic Society", year="2014", volume="34", number="16", pages="4363--4372", doi="10.1016/j.jeurceramsoc.2014.06.030", issn="0955-2219" }