Fabrication of stable monoclinic zirconia-based ceramics
Fabrication of stable monoclinic zirconia-based ceramics
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DOI：
10.1016/j.ceramint.2020.11.093
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发表时间：
2021-02-23
影响因子：
5.2
通讯作者：
Quandt, Eckhard
中科院分区：
文献类型：
--
作者：
Jetter, Justin;Rohmer, Jascha;Quandt, Eckhard
近年来，ZrO 2基陶瓷由于其形状记忆性能而受到关注。为了在形状记忆材料中使用形状恢复的能力，在所需应用的温度范围内访问孪生低对称相是必要的。然而，由于烧结后相变过程中的体积膨胀，在体相ZrO 2中难以形成稳定的单斜相。因此，该材料通常通过添加氧化钇稳定在四方相，这导致转变温度远低于室温。本文介绍了在室温下成功制备1-xY0.5Ta0.5O2 + xZr0.5Hf0.5O2（0.6
Recently ZrO2-based ceramics gained attention due to their shape memory properties. In order to use the power of shape recovery in shape memory materials, it is essential to access the twinned low symmetry phase in the temperature regime of the desired application. However, creating stable monoclinic phase is difficult in bulk ZrO2 due to volume expansion during phase transformations after sintering. Therefore, the material is often stabilized in the tetragonal phase by addition of yttria, which leads to transformation temperatures far below room temperature. In this article, we describe the sintering temperature and time as well as pre-processing steps for a successful formation of a stable, twinned monoclinic phase at room temperature in bulk ceramic 1-x Y0.5Ta0.5O2 + x Zr0.5Hf0.5O2 (0.6 < x