Preparation, microstructure and properties of ternary Al2O3/YAG/ZrO2 ceramics hot pressed with eutectic composition powders

Home > Archive>Volume 47, Issue S1, 2018 >288-293

Preparation, microstructure and properties of ternary Al2O3/YAG/ZrO2 ceramics hot pressed with eutectic composition powders
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Affiliation:School of Materials Science and Engineering,Harbin Institute of Technology,School of Materials Science and Engineering,Harbin Institute of Technology,School of Materials Science and Engineering,Harbin Institute of Technology,School of Materials Science and Engineering,Harbin Institute of Technology,School of Materials Science and Engineering,Harbin Institute of Technology,School of Materials Science and Engineering,Harbin Institute of Technology,School of Materials Science and Engineering,Harbin Institute of Technology,School of Materials Science and Engineering,Harbin Institute of Technology
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Al₂O₃/YAG/ZrO₂ powders with eutectic composition have been synthesized by the chemical co-precipitation in acohol-water aqueous solution and calcination method, and are characterized by X-ray diffraction, scanning electron microscopy and transmission electron microscopy. The precursors were calcined at temperatures of 600_oC-1350_oC in air, and the phase transition process was then revealed with increasing the calcination temperature. Al₂O₃/YAG/ZrO₂ powders calcined at 1300_oC for 1h consist of α-Al₂O₃, YAG and c-ZrO₂ phases. Al₂O₃/YAG/ZrO₂ ceramics with eutectic composition were hot-pressed at 1550_oC with the above-mentioned powders. The Al₂O₃/YAG/ZrO₂ ceramic sintered at 1550_oC contains an intragranular microstructure, and exhibits a relative density of 98.8%, a room-temperature flexural strength of 420 MPa, a fracture toughness of 3.69 MPa.m_1/2 and a high-temperature (1000_oC) flexural strength of 464MPa, respectively. The formation mechanism of an intragranular microstructure in the Al₂O₃/YAG/ZrO₂ ceramic has been proposed.

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[Jiahu Ouyang, Tiangang Yu, Yonghui Ma, Zhigang Wang, Henniche Abdelkhalek, Zhanguo Liu, Yujin Wang, Yu Zhou. Preparation, microstructure and properties of ternary Al₂O₃/YAG/ZrO₂ ceramics hot pressed with eutectic composition powders[J]. Rare Metal Materials and Engineering,2018,47(S1):288~293.]
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Received:July 03,2017
Revised:July 14,2017
Adopted:February 26,2018
Online: October 22,2018
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