Structural study of metastable tetragonal YSZ powders produced via a sol-gel route
Structural study of metastable tetragonal YSZ powders produced via a sol-gel route
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DOI：
10.1016/j.jallcom.2006.10.155
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发表时间：
2008-03-20
影响因子：
6.2
通讯作者：
Barnabe, Antoine
中科院分区：
文献类型：
--
作者：
Viazzi, Celine;Bonino, Jean-Pierre;Barnabe, Antoine
本文研究了溶胶-凝胶氧化钇稳定氧化锆（YSZ）。最终目标是将 YSZ 粉末加工成稳定的浆料，以便制备用于热涡轮发动机部件的热障厚涂层。事实上，该系统以其在高温下优异的热机械稳定性而闻名，但这些性能与这些材料的结构和微观结构特征之间的关系尚未完全了解。本文报道了溶胶-凝胶法合成YSZ粉末结构性能控制的最新进展以及该工艺与传统方法相比的主要优点的初步研究。作为实现这一认识的第一步，我们使用 X 射线衍射、结构 Rietveld 精修、拉曼光谱分析和透射电子显微镜对掺杂各种 xmol%YO1.5 涂层的 ZrO2 进行了结构研究。研究了YSZ粉末在1100℃、1200℃和1400℃不同温度下空气退火后晶体结构的演变，以更好地了解所需亚稳四方相（t'）的形成条件。然后，这项工作应该能够将化学和热机械参数与 YSZ 配方和溶胶-凝胶加工条件、温度和 t' 相性能相关联。 (c) 2006 Elsevier B.V. 保留所有权利。
Sol-gel yttria stabilized zirconia (YSZ) is investigated in this paper. The final aim is to process YSZ powders into stable slurries in order to prepare thick coatings for thermal barrier to be applied on hot turboengine components. In fact, this system is well-known for its excellent thermomechanical resistance at elevated temperatures but the relationship between these performances and the structural and microstructural characteristics of these materials is not fully understood. This paper reports a preliminary study concerning recent progress on the structural properties control of YSZ powders synthesized by sol-gel process and the main advantages of this process compared to conventional methods. As a first step towards this understanding, structural investigations of ZrO2 doped with various xmol%YO1.5 coatings, have been performed using X-ray diffraction, structural Rietveld refinement, Raman spectra analysis and transmission electron microscopy. The evolution of the crystallographic structure of YSZ powders after air annealing at various temperatures 1100 degrees C, 1200 degrees C and 1400 degrees C was studied to well understand the conditions of the formation of desired metastable tetragonal phase (t '). Then, this work should allow to correlate chemical and thermomechanical parameters as YSZ formulation and sol-gel elaboration conditions, temperature and t' phase performances. (c) 2006 Elsevier B.V. All rights reserved.