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HomeKey Engineering MaterialsKey Engineering Materials Vol. 814Effects of CeO2 Addition on Slip - Cast Yttria...

Effects of CeO₂ Addition on Slip - Cast Yttria Tetragonal Zirconia Polycrystals Toughened Alumina (ZTA)

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Abstract:

Addition of CeO₂ into ZTA and its effects on microstructure and mechanical properties were investigated. CeO₂ was detected with significant amounts only above 10 wt%. Viscosity was measured for slurry preparartions and characterization of mechanical properties of ZTA. Additions of CeO₂ of more than 10 wt% surpassed the solubility limit and formed Ce₂Zr₃O_10.Ce₂Zr₃O₁₀increased the tetragonality factor, prevented excessive grain growth through a pinning effect, which is attributed to the segregation of Ce₂Zr₃O₁₀ to the grain boundaries and showed a peak in fracture toughness with a value of 9.3 MPam^1/2 with 10 wt% additions of CeO₂. Further additions of CeO₂ reduced ZTA’s mechanical strength. Maximum value of H_v was 17700 MPa with 10 wt% CeO₂. Porosities have been attributed as the underlying reason as to why theoretical density were always higher than measured densities.

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Advanced Materials and Engineering Materials VIII

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Periodical:

Key Engineering Materials (Volume 814)

Pages:

340-346

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https://doi.org/10.4028/www.scientific.net/KEM.814.340

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Online since:

July 2019

Authors:

Sivakumar Sivanesan*, Teow Hsien Loong, Satesh Namasivayam, Mohammad Hosseini Fouladi

Keywords:

CeO₂, Mechanical, Microstructural, Y-TZP, ZTA

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© 2019 Trans Tech Publications Ltd. All Rights Reserved

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