Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10630175 | Journal of the European Ceramic Society | 2005 | 8 Pages |
Abstract
To investigate the corrosion behaviour of zirconia-toughened alumina (ZTA) under hydrothermal corrosion, a commercial material was compared with materials of similar composition, but fabricated using different processing methods and pure alumina. The specimens were corroded at a temperature of 200 °C in deionised water. Generally, linear corrosion kinetics were found. Pure alumina shows the lowest mass loss and the smallest rate constants. The reduction of the four-point bending strength does not correlate with the mass loss. The main parameter for the degradation is the cubic/tetragonal to monoclinic transformation of zirconia. Investigation of the corrosion of polished surfaces reveals spallation of Al2O3 grains or groups of grains surrounded by zirconia as the main mechanism. A decrease in the size of zirconia grains helps to reduce the strength degradation.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Mathias Herrmann, Björn Seipel, Jochen Schilm, Klaus G. Nickel, Grit Michael, Andreas Krell,