ZrO2-HfO2-Ta2O5 体系的相平衡研究和热力学建模

IF 5.8 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of The European Ceramic Society Pub Date : 2024-09-19 DOI:10.1016/j.jeurceramsoc.2024.116932

M. Löffler, O. Fabrichnaya

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引用次数: 0

摘要

通过平衡技术研究了 ZrO2-HfO2-Ta2O5 体系在 1673 K 和 1873 K 温度下的相平衡，并通过差热分析（DTA）研究了 ZrO2-HfO2-Ta2O5 体系在高达 2473 K 的温度范围内的相平衡。样品的相和化学成分通过 X 射线衍射（XRD）和扫描电子显微镜（SEM）以及能量色散 X 射线分析（EDX）进行了表征。通过 DTA 研究了熔化关系，然后通过 SEM/EDX 进行了微观结构研究。研究显示了共晶和共晶温度的成分依赖性。通过差示扫描量热法（DSC）测量了不同成分的（Zr,Hf）6Ta2O17 化合物在 100 K 至 230 K、220 K 至 570 K 和 330 K 至 1295 K 三个温度范围内的热容量。根据所获得的结果和我们之前的热力学描述，利用 CALPHAD 方法创建了 ZrO2-HfO2-Ta2O5 三元体系的数据库。

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Phase equilibrium investigations and thermodynamic modelling of the ZrO2-HfO2-Ta2O5 system

The phase equilibria in the ZrO₂-HfO₂-Ta₂O₅ system were studied at 1673 K and 1873 K by equilibration technique and in the temperature range up to 2473 K by differential thermal analysis (DTA). The phase and chemical composition of the samples were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM) with energy dispersive X-ray analysis (EDX). Melting relations were studied by DTA followed by microstructural investigation by SEM/EDX. The composition dependence of the eutectic and peritectic temperatures was shown. The heat capacity of the (Zr,Hf)₆Ta₂O₁₇ compound with different compositions was measured by differential scanning calorimetry (DSC) in three temperature ranges from 100 K to 230 K, from 220 K to 570 K, and from 330 K to 1295 K. Based on the obtained results and our previous thermodynamic descriptions, a database for the ternary ZrO₂-HfO₂-Ta₂O₅ system using the CALPHAD approach was created.

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来源期刊

Journal of The European Ceramic Society 工程技术-材料科学：硅酸盐

CiteScore

10.70

自引率

12.30%

发文量

863

审稿时长

35 days

期刊介绍： The Journal of the European Ceramic Society publishes the results of original research and reviews relating to ceramic materials. Papers of either an experimental or theoretical character will be welcomed on a fully international basis. The emphasis is on novel generic science concerning the relationships between processing, microstructure and properties of polycrystalline ceramics consolidated at high temperature. Papers may relate to any of the conventional categories of ceramic: structural, functional, traditional or composite. The central objective is to sustain a high standard of research quality by means of appropriate reviewing procedures.