Slow crack growth and hydrothermal aging stability of an alumina-toughened zirconia composite made from La2O3-doped 2Y-TZP
Slow crack growth and hydrothermal aging stability of an alumina-toughened zirconia composite made from La2O3-doped 2Y-TZP
复制标题
DOI：
10.1016/j.jeurceramsoc.2016.11.003
复制
发表时间：
2017-04
影响因子：
5.7
通讯作者：
Fei Zhang;J. Chevalier;C. Olagnon;B. Meerbeek;J. Vleugels
中科院分区：
文献类型：
--
作者：
Fei Zhang;J. Chevalier;C. Olagnon;B. Meerbeek;J. Vleugels
一种非常韧性的氧化锆基非常适合于制备氧化铝增韧氧化锆(ATZ)，而通常由3Y-TZP制备的复合材料并不表现出很高的韧性。然而，降低氧化钇含量以增加韧性的策略通常与增加水热老化敏感性有关。在本工作中，我们研究了一种掺杂0.4%La_2O_3的2Y-TZP基质，以实现20%Al_2O_3增韧的氧化锆基复合材料，该复合材料具有很高的耐老化性能。复合材料中较高的相变增韧使V-KI向较高的KI值移动，同时保持曲线的斜率，导致阈值KI0为4.0 Mpa/2，断裂韧性(KIC)为7.1 Mpa/2。与传统的3Y-TZP和未掺杂La2O的普通ATZ复合材料相比，这些复合材料可以在时效和抗裂性之间提供更好的折衷。
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% La2O3doped 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-KItowards higher KIvalues, while preserving the slope of the curve, resulting in a threshold KI0of 4.0 MPa m1/2and 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 La2O3doping.