Slow crack growth and hydrothermal aging stability of an alumina-toughened zirconia composite made from La2O3-doped 2Y-TZP.

A very tough zirconia matrix is interesting to fabricate alumina-toughened zirconia (ATZ) and composites generally processed from 3Y-TZP do not exhibit very high toughness. The strategy of lowering the yttria content to increase toughness however is normally associated with an increased hydrothermal aging susceptibility. In this work, a 0.4 mol% La 2 O 3 doped 2Y-TZP matrix was investigated to realize a 20 wt.% alumina toughened zirconia composite with a substantially high aging resistance. The higher transformation toughening in the composite shifted the V-K I towards higher K I values, while preserving the slope of the curve, resulting in a threshold K I0 of 4.0 MPa m 1/2 and fracture toughness (K IC ) of 7.1 MPa m 1/2 . These composites can offer a better compromise between aging and crack resistance than traditional 3Y-TZPs and plain ATZ composites without La 2 O 3 doping. [ABSTRACT FROM AUTHOR]