Transformation behavior in Al2O3‒ZrO2 ceramic composites

X. L. Wang; J. A. Fernandez-Baca; C. R. Hubbard; K. B. Alexander; P. F. Becher

doi:10.1016/0921-4526(95)00292-H

Transformation behavior in Al2O3‒ZrO2 ceramic composites

X. L. Wang, J. A. Fernandez-Baca, C. R. Hubbard, K. B. Alexander, P. F. Becher

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Abstract

Neutron powder diffraction was used to investigate the tetragonal-to-monoclinic transformation of ZrO₂ in an Al₂O₃{single bond}ZrO₂ ceramic composite containing 40 vol% tetragonal ZrO₂. The neutron-diffraction data were analyzed using the Rietveld refinement technique, which allowed determination of the extent of the transformation, as a function of temperature. The onset transformation temperature determined for this sample was 130 K. Below this temperature, the fraction of the monoclinic phase continued to increase to about 9 vol% at 80 K and remained constant for temperatures below 80 K. The calculated thermal expansion, using the refined lattice parameters, was found to be in excellent agreement with dilatometry data, confirming that the sharp increase in the thermal expansion upon cooling resulted from the tetragonal-to-monoclinic phase transformation in ZrO₂.

Original language	English
Pages (from-to)	824-826
Number of pages	3
Journal	Physica B: Physics of Condensed Matter
Volume	213-214
Issue number	C
DOIs	https://doi.org/10.1016/0921-4526(95)00292-H
State	Published - Aug 1 1995

Funding

This research was sponsored by the Laboratory Directed Research and Development Program of Oak Ridge National Laboratory and by the Division of Materials Sciences, US Department of Energy under contract DE-AC05-840R21400 with Martin Marietta Energy Systems, Inc.

Funders	Funder number
US Department of Energy	DE-AC05-840R21400
Oak Ridge National Laboratory
Division of Materials Sciences and Engineering

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10.1016/0921-4526(95)00292-H

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title = "Transformation behavior in Al2O3‒ZrO2 ceramic composites",

abstract = "Neutron powder diffraction was used to investigate the tetragonal-to-monoclinic transformation of ZrO2 in an Al2O3{single bond}ZrO2 ceramic composite containing 40 vol% tetragonal ZrO2. The neutron-diffraction data were analyzed using the Rietveld refinement technique, which allowed determination of the extent of the transformation, as a function of temperature. The onset transformation temperature determined for this sample was 130 K. Below this temperature, the fraction of the monoclinic phase continued to increase to about 9 vol% at 80 K and remained constant for temperatures below 80 K. The calculated thermal expansion, using the refined lattice parameters, was found to be in excellent agreement with dilatometry data, confirming that the sharp increase in the thermal expansion upon cooling resulted from the tetragonal-to-monoclinic phase transformation in ZrO2.",

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AU - Wang, X. L.

AU - Fernandez-Baca, J. A.

AU - Hubbard, C. R.

AU - Alexander, K. B.

AU - Becher, P. F.

PY - 1995/8/1

Y1 - 1995/8/1

N2 - Neutron powder diffraction was used to investigate the tetragonal-to-monoclinic transformation of ZrO2 in an Al2O3{single bond}ZrO2 ceramic composite containing 40 vol% tetragonal ZrO2. The neutron-diffraction data were analyzed using the Rietveld refinement technique, which allowed determination of the extent of the transformation, as a function of temperature. The onset transformation temperature determined for this sample was 130 K. Below this temperature, the fraction of the monoclinic phase continued to increase to about 9 vol% at 80 K and remained constant for temperatures below 80 K. The calculated thermal expansion, using the refined lattice parameters, was found to be in excellent agreement with dilatometry data, confirming that the sharp increase in the thermal expansion upon cooling resulted from the tetragonal-to-monoclinic phase transformation in ZrO2.

AB - Neutron powder diffraction was used to investigate the tetragonal-to-monoclinic transformation of ZrO2 in an Al2O3{single bond}ZrO2 ceramic composite containing 40 vol% tetragonal ZrO2. The neutron-diffraction data were analyzed using the Rietveld refinement technique, which allowed determination of the extent of the transformation, as a function of temperature. The onset transformation temperature determined for this sample was 130 K. Below this temperature, the fraction of the monoclinic phase continued to increase to about 9 vol% at 80 K and remained constant for temperatures below 80 K. The calculated thermal expansion, using the refined lattice parameters, was found to be in excellent agreement with dilatometry data, confirming that the sharp increase in the thermal expansion upon cooling resulted from the tetragonal-to-monoclinic phase transformation in ZrO2.

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Transformation behavior in Al2O3‒ZrO2 ceramic composites

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