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...

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Bibliographic Details
Published in:Journal of the European Ceramic Society 2017-04, Vol.37 (4), p.1865-1871
Main Authors: Zhang, Fei, Chevalier, Jérôme, Olagnon, Christian, Meerbeek, Bart Van, Vleugels, Jef
Format: Article
Language:English
Subjects:
Alumina toughed zirconia (ATZ)
Hydrothermal aging resistance
Slow crack growth (SCG)
Zirconia
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Summary: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 0.4mol% La2O3 doped 2Y-TZP matrix was investigated to realize a 20wt.% alumina toughened zirconia composite with a substantially high aging resistance. The higher transformation toughening in the composite shifted the V-KI towards higher KI values, while preserving the slope of the curve, resulting in a threshold KI0 of 4.0MPam1/2 and fracture toughness (KIC) of 7.1MPam1/2. These composites can offer a better compromise between aging and crack resistance than traditional 3Y-TZPs and plain ATZ composites without La2O3 doping.
ISSN:0955-2219
1873-619X
DOI:10.1016/j.jeurceramsoc.2016.11.003