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Research Article | Open Access

Study of 0.9Al2O3–0.1TiO2 ceramics prepared by a novel DCC-HVCI method

Jia-Min WU, Huan XIAO, Meng-Yue LIU, Ying CHEN( ), Yi-Xin MA, Li-Jin CHENG( ), Yu-Sheng SHI
State Key Laboratory of Materials Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
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Abstract

In this paper, in-situ coagulation of 0.9Al2O3–0.1TiO2 suspension and microwave dielectric properties of 0.9Al2O3–0.1TiO2 ceramics prepared by a novel direct coagulation casting via high valence counter ions (DCC-HVCI) method were proposed. The 0.9Al2O3–0.1TiO2 suspension could be coagulated via controlled release of calcium ions from calcium iodate at an elevated temperature. The influence of tri-ammonium citrate (TAC) content, solid loading, and calcium iodate content on the rheological properties of the suspension was investigated. In addition, the influence of coagulation temperature on coagulation time and properties of green bodies was also studied. It was found that the stable 0.9Al2O3–0.1TiO2 suspension could be successfully prepared by adding 0.3 wt% TAC and adjusting pH value to 10–12 at room temperature. 0.9Al2O3–0.1TiO2 green bodies with uniform microstructures were coagulated by adding 8.0 g/L calcium iodate after treating at 70 ℃ for 1 h. 0.9Al2O3–0.1TiO2 ceramics, sintered at 1500 ℃ for 4 h and annealed at 1100 ℃ for 5 h, showed uniform microstructures with density of 3.62±0.02 g/cm3. The microwave dielectric properties of 0.9Al2O3–0.1TiO2 ceramics prepared by DCC-HVCI method were: εr= 11.26±0.06, Q×f = 11569± 629 GHz, τf= 0.93±0.60 ppm/℃. The DCC-HVCI method is a novel and promising route without binder removal process to prepare complex-shaped microwave dielectric ceramics with uniform microstructures and good microwave dielectric properties.

Keywords

rheological propertiesmicrowave dielectric properties0.9Al2O3–0.1TiO2DCC-HVCI

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Journal of Advanced Ceramics
Volume 7 Issue 2,
June 2018
Pages 152-159
DOI: 10.1007/s40145-018-0266-4
Cite this article:
WU J-M, XIAO H, LIU M-Y, et al. Study of 0.9Al2O3–0.1TiO2 ceramics prepared by a novel DCC-HVCI method. Journal of Advanced Ceramics, 2018, 7(2): 152-159. https://doi.org/10.1007/s40145-018-0266-4

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Received: 31 December 2017
Revised: 03 March 2018
Accepted: 05 March 2018
Published: 28 March 2018
© The author(s) 2018

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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