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Grain Boundary Diffusion in Cation-Doped Superplastic 3Y-TZP

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Abstract:

The superplastic flow in tetragonal zirconia polycrystals stabilised 3mol% Y2O3 (3YTZP) is strongly affected by the dopant cations, which segregate at the grain boundary. It is proposed that this flow is controlled by grain boundary diffusion of Zr4+ ions and therefore the dopant cations should change the grain boundary diffusion. In order to prove this thesis the measurements of grain boundary diffusion coefficients were made using Hf4+ ions as tracer. Zirconia samples were doped with 1mol% of Al2O3, SiO2, MgO, MgAl2O4, GeO2 and TiO2. The tracer was deposited on the surface of the zirconia specimens by placing several drops of hafnium nitrate and then drying at 373 K. In this way, thin films of HfO 2 were obtained. The samples were heated in the range 1553 – 1773 K for 1 to 24 h. The concentration versus depth profiles were measured using secondary ion mass spectrometry (SIMS). Calculated hence grain boundary diffusion coefficients were several times bigger for doped samples than for pure 3Y-TZP samples.

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Periodical:

Advances in Science and Technology (Volume 45)

Pages:

1626-1631

DOI:

https://doi.org/10.4028/www.scientific.net/AST.45.1626

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Online since:

October 2006

Authors:

Marek Boniecki, Rafał Jakieła, Zdzislaw Librant, Wladyslaw Wesolowski, Danuta Dabrowska, Agata Karas

Keywords:

Bulk Diffusion, Dopant Cations, Grain Boundary, Hafnium Tracer, Secondary Ion Mass Spectroscopy (SIMS), Superplastic Tetragonal Zirconia

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© 2006 Trans Tech Publications Ltd. All Rights Reserved

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