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Research Article | Open Access

Preparation of large size ZTA ceramics with eccentric circle shape by microwave sintering

Yongqiang CHENa,b, Bingbing FANb,c( ), Gang SHAOb, Rui ZHANGa,b( )
Zhengzhou University of Aeronautics, Henan 450015, China
School of Materials Science and Engineering, Zhengzhou University, Henan 450001, China
Sinosteel Luoyang Institute of Refractories Research Co., Ltd., Henan 471039, China
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Abstract

Ultra-large zirconia toughened alumina (ZTA, mass ratio of Al2O3 and ZrO2 is 78:22) ceramics with eccentric circle shape were successfully sintered by microwave sintering with a multi-mode cavity at 2.45 GHz. The dimension of ZTA ceramics (green body) is 165 mm (outer diameter) × 25 mm (thickness). The optimized sintering temperature of microwave sintering is about 1500 ℃ for 30 min, and the total sintering time is about 4 h which is much shorter than that of conventional sintering. An auxiliary-heating insulation device was designed based on the principle of local caloric compensation to guarantee the intact sintered samples. With the increasing of sintering temperature, more and more microwave energy is absorbed within the entire sample, volumetric densification performs, and phases shift from m-ZrO2 phase to t-ZrO2 phase and cause Al2O3 grain growth.

Keywords

large size ZTA ceramicseccentric circle shapemicrowave sinteringlocal caloric compensation

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Journal of Advanced Ceramics
Volume 5 Issue 4,
December 2016
Pages 291-297
DOI: 10.1007/s40145-016-0202-4
Cite this article:
CHEN Y, FAN B, SHAO G, et al. Preparation of large size ZTA ceramics with eccentric circle shape by microwave sintering. Journal of Advanced Ceramics, 2016, 5(4): 291-297. https://doi.org/10.1007/s40145-016-0202-4

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Received: 22 April 2016
Revised: 01 August 2016
Accepted: 08 August 2016
Published: 23 December 2016
© The author(s) 2016

Open Access The articles published in this journal are distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons. org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
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