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Directionally solidified Al2O3/ZrO2 eutectic ceramic prepared with induction heating zone melting

Published online by Cambridge University Press:  15 May 2018

Weinan Wang ,
Juncheng Liu  and
Caiyu Song
Weinan Wang
Affiliation:
School of Materials Science and Engineering, Tianjin Polytechnic University, Tianjin 300387, China
Juncheng Liu*
Affiliation:
School of Materials Science and Engineering, Tianjin Polytechnic University, Tianjin 300387, China
Caiyu Song
Affiliation:
School of Materials Science and Engineering, Tianjin Polytechnic University, Tianjin 300387, China
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

To prepare high quality large solidified Al2O3/ZrO2 eutectic ceramic, the preparation processing of the presintered ceramic as a feed rod was investigated via experiments; some parameters of the induction heating zone process were optimized via numerical modeling; an Al2O3/ZrO2 eutectic ceramic rod with a diameter 10 mm was prepared. The results show that increasing the sintering temperature could increase the presintered ceramic’s bulk density, while increasing sintering time had little effect. And the bulk density increased first and then decreased with the molding pressure increase. And the saucer coil obtained a higher temperature gradient than the tubbiness coil for a fixed crucible wall maximum temperature, and the coil turn’s increase could increase the melting zone height in the induction zone melting process. In the directionally solidified Al2O3/ZrO2 eutectic ceramics, Al2O3 phase is the matrix phase, and the ZrO2 phase embedded in the Al2O3 phase mostly with the rod shape, and little with lamellar. The hardness of directionally solidified eutectic ceramics reaches 16.17 GPa and the fracture toughness reaches 4.76 MPa m1/2, which are 1.7 times and 1.5 times of the presintered eutectic ceramic, respectively.

Keywords

Al2O3/ZrO2eutectic ceramicdirectional solidificationinduction heating zone meltingpresintered ceramicssolidified microstructure
Type
Article
Information
Journal of Materials Research , Volume 33 , Issue 11 , 13 June 2018 , pp. 1681 - 1689
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Copyright
Copyright © Materials Research Society 2018 

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