Study of the influence of structural modification of ZrO2 ceramics on resistance to hydrogen absorption and gas swelling processes

The main objective of this work is to study the influence of structural changes in ZrO2 ceramics on the resistance to hydrogenation processes arising from testing the performance of ceramics as materials for solid oxide fuel cells. During the conducted studies, it was established that the use of stabilizing additives MgO and CaCO3 to initiate processes of polymorphic transformations in ZrO2 ceramics makes it possible to increase the resistance of ceramics to hydrogen swelling due to the stabilization of the crystal structure, the change of which is associated with polymorphic transformations. Suppression of volumetric swelling processes due to polymorphic transformations caused by the addition of stabilizing additives made it possible to elevate resistance to hydrogen absorption and destabilization of the near-surface layer by preventing hydrogen agglomeration processes in the near-surface layer. It has been determined that the modification of ZrO2 ceramics by initiating processes of polymorphic transformations of the type m-ZrO2 -* t - ZrO2 and m-ZrO2 -* c-ZrO2 leads not only to an increase in strength indicators, but also to an increase in resistance to embrittlement processes during hydrogenation and high-temperature degradation.