Effect of Y doping on microstructure and thermophysical properties of yttria stabilized hafnia ceramics |
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| Authors: | Chun Li Yue Ma Zhaolu Xue Yonghong Yang Jianhua Chen Hongbo Guo |
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| Affiliation: | 1. School of Materials Science and Engineering, Beijing Key Laboratory for Advanced Functional Material and Thin Film Technology, Beihang University (BUAA), No. 37 Xueyuan Road, Beijing 100191, PR China;2. Xi’an Aerospace Propulsion Institute, No. 289 Fei-Tian Road, Xi’an National Civil Aerospace Industrial Base, Xi’an 71000, PR China |
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| Abstract: | A series of Y2O3-doped HfO2 ceramics (Hf1-xYxO2-0.5×, x?=?0, 0.04, 0.08, 0.12, 0.16 and 0.2) were synthesized by solid-state reaction at 1600?°C. The microstructure, thermophysical properties and phase stability were investigated. Hf1-xYxO2–0.5x ceramics were comprised of monoclinic (M) phase and cubic (C) phase when Y3+ ion concentration ranged from 0.04 to 0.16. The thermal conductivity of Hf1-xYxO2–0.5x ceramic decreased as Y3+ ion concentration increased and Hf0.8Y0.2O1.9 ceramic revealed the lowest thermal conductivity of ~?1.8?W/m*K at 1200?°C. The average thermal expansion coefficient (TEC) of Hf1-xYxO2–0.5x between 200?°C and 1300?°C increased with the Y3+ ion concentration. Hf0.8Y0.2O1.9 yielded the highest TEC of ~?10.4?×?10?6 K?1 while keeping good phase stability between room temperature and 1600?°C. |
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| Keywords: | Yttria stabilized hafnia (YSH) Phase stability Microstructure Thermophysical properties |
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