Low Temperature Degradation and Mechanical Properties of Alumina Reinforced Ceria-Zirconia by Colloidal Processing

10Ce-TZP base composites with 2.5, 5, 10 and 15 wt% alumina were fabricated by colloidal processing from slurries with 41 vol% solid load in order to investigate the effects of alumina in the final composites aging and mechanical properties. Alumina particle surface charge was modified with the addition of 3 wt% of PAA. The resulting composites have high relative densities (similar to 99%) and homogeneous alumina distribution. The microstructure is refined by the alumina addition resulting in a tetragonal-monoclinic microstructure with monoclinic phase content diminishing with alumina concentration down to 16 vol% in 10Ce-15Al(2)O(3) composite. From the study of hydrothermal aging in autoclave steam at 134 degrees C and 2 bar pressure, it is concluded that all composites have very high resistance to low temperature degradation. At the same time, mechanical properties were investigated by measuring hardness, elastic modulus, strength and t-m transformation around Vickers and spherical indentations. The t-m transformation extension around imprints prevents the formation of Vickers indentations cracks, which indicates a high level of damage tolerance for all compositions. In particular, for 10Ce-15Al(2)O(3) composite, an excellent combination of hardness (similar to 10 GPa), strength (similar to 1400 MPa), damage tolerance, and resistance to low temperature degradation is achieved.

Automated summary

The study showed that all composites have high resistance to low temperature degradation, and exhibit a combination of high hardness, elastic modulus, strength, and resistance to low temperature degradation.