Degration of partially stabilized zirconia ceramics under an applied stress

Abstract

Partially stabilized zirconia ceramics were sintered using fine powder of ZrO₂-3 mol% Y₂O₃ prepared by the chemical co-precipitation method. The tetragonal-to-monoclinic phase transformation in ZrO₂ ceramics during the aging in boiling water and the effect of an applied stress of 100MPa were mainly investigated. The degradation of ZrO₂ ceramics is considered to be caused by the reaction between Y₂O₃ and H₂O, which leads to a decreasing in the stability of tetragonal phase of ZrO₂. It is found that the tensile stress improves the driving force of the phase transformation and accelerates the degradation while the compressive stress has no obvious effect on the degradation.

Keywords

degradation / partially stabilized zirconia / applied stress

References

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