MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
High Temperature Oxidation of Y2O3 Partially-Stabilized ZrO2 Composites Dispersed with Ni Particles
Makoto NankoMakoto YoshimuraToshio Maruyama
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2003 Volume 44 Issue 4 Pages 736-742

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Abstract

High temperature oxidation of Y2O3-partially stabilized ZrO2 composites dispersed with Ni particles was investigated at temperatures ranging from 873 to 1073 K in air. Cracks between Ni particles forms parallel to the surface during high temperature oxidation. Thickness of the cracked zone increases proportionally with increasing oxidation time. A model for the growth of the cracked zone was established as a basis of the oxidation of Ni particles by permeation of oxide ions through the Y2O3-partially stabilized ZrO2 matrix, which is rate-controlled by hole conduction. Growth behavior calculated by the model is in good agreement with the experimental results.

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© 2003 The Japan Institute of Metals and Materials
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