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Preparation of Ce-ZrO2 Based Composites and Effect of Addition of 3Y-ZrO2 on Their Microstructures

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Abstract:

12 mol%CeO2 based composites were fabricated by a pressureless sintering technique and post-HIP treatments. The mixture of 12CeO2-ZrO2/3Y2O3-ZrO2 (= 80 wt%/20 wt%) powders from various methods were prepared by a ball milling technique and consequently sintered at 1400 in air atmosphere and post-HIP treatment at 1350. The 12Ce-ZrO2/Y-ZrO2 composites sintered from mixture of 12CeO2-ZrO2 powder and 3Y2O3-ZrO2 powders possessed the high strength over 1300 MPa and also high fracture toughness over 11 MPam1/2. Furthermore, the significant inhibition of the ZrO2 phase transformation of tetragonal to monoclinic phase under an aqueous hydrothermal condition at 150 was obtained for these 12Ce-ZrO2/Y-ZrO2 composites prepared from this method. Microstructural observation was in detail performed by TEM and EDS.

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Periodical:

Key Engineering Materials (Volumes 317-318)

Pages:

41-44

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.317-318.41

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Online since:

August 2006

Authors:

Atsushi Nakahira, Mitsuhiko Ohta, T. Murakami, T. Kudo

Keywords:

CeO2-ZrO2, Strength, Toughness, Transformation, Y2O3-ZrO2, ZrO2-Based Composites

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© 2006 Trans Tech Publications Ltd. All Rights Reserved

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