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

    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 600oC-1350oC in air, and the phase transition process was then revealed with increasing the calcination temperature. Al2O3/YAG/ZrO2 powders calcined at 1300oC for 1h consist of α-Al2O3, YAG and c-ZrO2 phases. Al2O3/YAG/ZrO2 ceramics with eutectic composition were hot-pressed at 1550oC with the above-mentioned powders. The Al2O3/YAG/ZrO2 ceramic sintered at 1550oC 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.m1/2 and a high-temperature (1000oC) 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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History
  • Received:July 03,2017
  • Revised:July 14,2017
  • Adopted:February 26,2018
  • Online: October 22,2018

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