2003 Volume 44 Issue 4 Pages 736-742
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.