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Zirconia-Mullite Obtained from Co-Precipitated Zirconia-Mullite Composite Powders by SPS
H.Z. Li1, Z.J. Li1, X.D. Luo1, J.Y. Gui2, Z.P. Xie2
1 School of High Temperature Materials and Magnesium Resource Engineering, University of Science and Technology Liaoning, Anshan 114051, China
2 State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
received August 23, 2016, received in revised form September 11, 2016, accepted September 23, 2016
Vol. 7, No. 4, Pages 417-422 DOI: 10.4416/JCST2016-00059
Abstract
The co-precipitation method is used to fabricate precursor powder. This powder is densified by means of the spark plasma sintering (SPS) technique at 1500 °C with a holding time of 7 min to prepare zirconia-mullite samples. Their density measures up to 97 % of the theoretical density, and the sintered mullite compacts exhibit better strength properties (289 ± 12 MPa) and Hv (9.99 GPa). The mode of fracture is changed with the addition of ZrO2 and extensive fine cleavages are observed on the grain surface. These cleavages join together to form steps, which can absorb more energy. The flexural strength of the samples is almost double that of pure mullite, which is related to the formation of cleavages.
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Keywords
Zirconia-mullite, co-precipitation, flexural strength, Vickers hardness, microstructure
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