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Sintering behavior and thermal conductivity of Y2O3 fully stabilized HfO2 ceramics

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Abstract

A series of Y2O3 fully stabilized HfO2 ceramics (Hf1−xYxO2−0.5x, x = 0.20, 0.24, 0.28, 0.32, 0.36 and 0.40) were synthesized by solid-state reaction at 1500 °C. The phase composition, thermal conductivity and sintering behavior at 1400 °C of the ceramic bulks were studied. The Hf1−xYxO2−0.5x ceramics were comprised of pure cubic phase with disordered fluorite structure. No phase transformation occurred in the ceramics with Y3+ doping concentration ranging from 0.24 to 0.36. Both Hf0.64Y0.36O1.82 and Hf0.6Y0.4O1.8 samples revealed the lowest grain growth rate when sintered at 1400 °C, indicating good resistance to sintering. However, the Vicker’s hardness and Young’s modulus after annealed for 96 h at 1400 °C for the Hf0.64Y0.36O1.82 sample were 8.97 and 200 GPa, respectively, much lower than those of the Hf0.6Y0.4O1.8 (14.51 and 237 GPa, respectively). The thermal conductivity of Hf1−xYxO2−0.5x first decreased and then increased slowly as the Y3+ content increased, and the associated mechanism was discussed.

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Acknowledgements

This research was financially sponsored by the National Natural Science Foundation of China (Nos. U1537212 and 51471019), China Postdoctoral Science Foundation (Nos. 2017T100023 and 2016M600028) and the National Key Research and Development Program of China (No. 2016YFB0300901).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Beihang University, Beijing, 100191, China

    Chun Li, Jian He & Yue Ma

  2. School of Energy and Power Engineering, Beihang University, Beijing, 100191, China

    Jian He

  3. Key Laboratory of High-Temperature Structural Materials and Coatings Technology (Ministry of Industry and Information Technology), Beihang University, Beijing, 100191, China

    Jian He & Yue Ma

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  1. Chun Li
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Correspondence to Jian He.

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Li, C., He, J. & Ma, Y. Sintering behavior and thermal conductivity of Y2O3 fully stabilized HfO2 ceramics. Rare Met. 40, 1255–1266 (2021). https://doi.org/10.1007/s12598-020-01421-5

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  • DOI: https://doi.org/10.1007/s12598-020-01421-5

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