Microstructure and thermal properties of RETaO₄ (RE = Nd, Eu, Gd, Dy, Er, Yb, Lu) as promising thermal barrier coating materials

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• 作者：Jun Wang ; XiaoYu Chong ; Rong Zhou ; Jing Feng ; ^{jingfeng@kmust.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Thermal barrier coatings ; RETaO4 ceramic ; Raman spectroscopy ; Thermal conductivity ; Vickers hardness
• 刊名：Scripta Materialia
• 出版年：2017
• 出版时间：1 January 2017
• 年：2017
• 卷：126
• 期：Complete
• 页码：24-28
• 全文大小：945 K

文摘

The RETaO₄ ceramics with low-thermal conductivity were fabricated using a solid-state reaction. The phase composition and microstructures of high-temperature RETaO₄ (RE = Nd, Eu, Gd, Dy, Er, Yb, Lu) ceramics were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM) and Raman spectroscopy. The RETaO₄ ceramics had lower thermal conductivity (1.38 to 1.94 W·m^− 1·K^-1 at 800 °C) than 7-8YSZ (2.37 and 2.47 W·m^− 1·K^− 1 at 800 °C, respectively). The porosity significantly affected the thermal conductivity of RETaO₄ ceramics. The RETaO₄ ceramics also had lower Vickers hardness than 8YSZ, which suggests that RETaO₄ has better fracture toughness and thermal tolerance.