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Journal of Ceramic Science and Technology

The Journal of Ceramic Science and Technology publishes original scientific articles on all topics of ceramic science and technology from all ceramic branches. The focus is on the scientific exploration of  the relationships between processing, microstructure and properties of sintered ceramic materials as well as on new processing routes for innovative ceramic materials. The papers may have either theoretical or experimental background. A high quality of publications will be guaranteed by a thorough double blind peer review process.

The Journal is published by Göller Verlag GmbH on behalf of the Deutsche Keramische Gesellschaft (DKG). Edited by Yu-Ping Zeng, Shanghai Institute of Ceramics, Chinese Academy of Sciences, China.

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Synthesis, Densification and Characterization of Nanosized Oxide Ceramic Powders with Eutectic Compositions by Heating of Alcohol-Aqueous Salt Solutions

J.-H. Ouyang, Y.-H. Ma, A. Henniche, B. Wang, Z.-G. Wang, Y.-J. Wang

School of Materials Science and Engineering, Harbin Institute of Technology, 92 Westdazhi Street, Harbin 150001, China

received October 29, 2016, received in revised form December 3, 2016, accepted January 13, 2017

Vol. 8, No. 1, Pages 81-90   DOI: 10.4416/JCST2016-00097

Abstract

Nanosized spherical powders of Al2O3-ZrO2 (Y2O3) and Al2O3-SmAlO3 with eutectic compositions have been synthesized with a facile and novel method involving the heating of aqueous salt solutions with an alcohol-water mixture as the solvent. The kind and concentration of aqueous salt solutions have a significant influence on the precipitation and morphologies of the resulting powders. Nanoscale particulates with a narrow size distribution were successfully obtained. The amorphous powders are crystallized to a mixture of t-ZrO2 phase and α-Al2O3 phase at a calcination temperature of 1250 °C. Al2O3-ZrO2 (Y2O3) powders exhibit an average particle size of 200 nm after calcination. However, fine Al2O3-SmAlO3 nano-powders with an average size of 40 nm were synthesized after calcination at 1300 °C in which the resulting precipitates are crystallized to a mixture of α-Al2O3 and orthorhombic SmAlO3. These ceramic powders were densified by hot pressing to further evaluate their microstructure and mechanical properties. The as-sintered Al2O3-ZrO2 (Y2O3) ceramic consists of 42.8 wt% t-ZrO2 and 57.2 wt% α-Al2O3 with a relative density of 98.5 %, and has a flexural strength of 1363 MPa and fracture toughness of 10.01 MPa·m1/2, which is mainly attributed to phase transformation toughening of t-ZrO2 to m-ZrO2 during fracture. However, the Al2O3-SmAlO3 ceramic has a relative density of 99.2%, but flexural strength of just 529 MPa.

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Keywords

Al2O3-ZrO2(Y2O3) ceramic, Al2O3-SmAlO3 ceramic, co-precipitation, microstructure morphology, mechanical properties

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