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

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• 作者：Fei Zhang^a ; ^b ; ^{fzfei.zhang@gmail.com} ; ^{fei.zhang@kuleuven.be} ; Jé ; rô ; me Chevalier^c ; Christian Olagnon^c ; Bart Van Meerbeek^b ; Jef Vleugels^a
• 关键词：Zirconia ; Alumina toughed zirconia (ATZ) ; Hydrothermal aging resistance ; Slow crack growth (SCG)
• 刊名：Journal of the European Ceramic Society
• 出版年：2017
• 出版时间：April 2017
• 年：2017
• 卷：37
• 期：4
• 页码：1865-1871
• 全文大小：1586 K
• 卷排序：37

文摘

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% La2O3 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-KI towards higher KI values, while preserving the slope of the curve, resulting in a threshold KI0 of 4.0 MPa m1/2 and fracture toughness (KIC) of 7.1 MPa m1/2. These composites can offer a better compromise between aging and crack resistance than traditional 3Y-TZPs and plain ATZ composites without La2O3 doping.