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Oxygen diffusivities in mullite/zirconia composites measured by 18O/16O isotope exchange and secondary ion mass spectrometry

Published online by Cambridge University Press:  31 January 2011

Hong-Da Ko  and
Chien-Cheng Lin
Hong-Da Ko
Affiliation:
Department of Materials Science and Engineering, National Chiao Tung University, Hsinchu 30050, Taiwan
Chien-Cheng Lin*
Affiliation:
Department of Materials Science and Engineering, National Chiao Tung University, Hsinchu 30050, Taiwan
*
a) Address all correspondence to this author. e-mail: [email protected]
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Abstract

Oxygen diffusivities in mullite/zirconia composites were measured by 18O/16O isotope exchange and secondary ion mass spectrometry. They exhibited a wide range of values from 10−21 to 10−10 m2/s at temperatures between 1000 and 1350 °C in the composites with 0 to 80 vol% zirconia. At a fixed temperature, oxygen diffusivities in high-zirconia composites were larger by at least eight orders of magnitude than those in low-zirconia composites. The percolation threshold occurred between 30 and 40 vol% zirconia, where oxygen diffusivities dramatically changed. There was a clear tendency of the activation energies of oxygen diffusion in composites to decrease with increasing zirconia contents. The large oxygen diffusivities in the high-zirconia composites were attributed to the interconnected channels of zirconia from the microstructural aspect.

Keywords

DiffusionSecondary ion mass spectroscopy (SIMS)Composite
Type
Articles
Information
Journal of Materials Research , Volume 23 , Issue 2 , February 2008 , pp. 353 - 358
Copyright
Copyright © Materials Research Society 2007

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