FRACTURE STRENGTH AND DYNAMIC ELASTIC-MODULUS OF CE-TZP AND ER-TZP ATLOW-TEMPERATURE

Fracture strength of TZP containing 14.5, 15.5, and 16.5 mol% CeO2 is studied using static three-point bending at low temperature. There is 22%-46% increase from 300 to 77 K and 47%-92% increase from 300 to 4.2 K in fracture strength of Ce-TZP. The temperature dependencies of dyn amic elastic modulus and damping capacity of CeO2/Er2O3-alloyed tetrag onal zirconia ceramics (Ce-/Er-TZP) between 300 and 77 K are character ized using flexural vibration. System identification techniques in tim e domain are used to identify dynamic parameters from strain vibration signals of the ceramic samples. The results indicate that there is 15 %-22% increase of Ce-TZP and 9%-22% increase of Er-TZP in dynamic elas tic modulus from 300 to 77 K. The microhardness of Ce-/Er-TZP was meas ured at room temperature.