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

doi:10.1007/s40145-018-0266-4

Journal of Advanced Ceramics 2018, 7(2): 152-159 https://doi.org/10.1007/s40145-018-0266-4

Research Article |

Open Access | Issue | Published: 28 March 2018

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

Show Author's Information Hide Author's Information 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

Keywords:

rheological properties, microwave dielectric properties, 0.9Al₂O₃–0.1TiO₂, DCC-HVCI

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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Abstract Full text About this article

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: $ε_{r}$ = 11.26±0.06, Q×f = 11569± 629 GHz, $τ_{f}$ = 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.

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About this article

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

Show Author's information Hide Author's Information 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

Abstract

Keywords: rheological properties, microwave dielectric properties, 0.9Al₂O₃–0.1TiO₂, DCC-HVCI

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Publication history

Received: 31 December 2017

Revised: 03 March 2018

Accepted: 05 March 2018

Published: 28 March 2018

Issue date: June 2018

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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.