Degradation of 5 mol% yttria-zirconia by intergranular cracking in water at 300 A degrees C

作者：Vandermeulen W^*; Bosch R W; Leenaers A; Van Renterghem W; Snijkers F

来源：Journal of Materials Science, 2010, 45(20): 5502-5511.

DOI：10.1007/s10853-010-4608-z

Zirconia-5 mol% yttria has been used successfully for pH sensing in high temperature water (a parts per thousand yen300 A degrees C). However, this material, which consists of the cubic phase with 2-8 vol.% intergranular tetragonal precipitates, is not always stable in this environment and some batches were found to be fragmented by cracking within a few days. To study this effect, different samples of the material were structurally characterised and exposed to 300 A degrees C water. It was found that the susceptibility to cracking increased with the volume content of the intergranular precipitates. The cracking mechanism was explained by the stress-induced grain boundary cracking of the cubic phase, the stress being due to the water-induced martensitic transformation of the tetragonal precipitates. A model has been proposed which allows to interpret the dependence of crack formation propensity on the size of the tetragonal precipitates.

• 出版日期2010-10