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Effect of Y0.5Er0.5Ho0.5Yb0.5O3 addition on the microstructure and thermal stability of continuous alumina fibers

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Abstract

Continuous alumina fibers with excellent thermal stability are essential in high-temperature applications. In this study, 0~1 wt% Y0.5Er0.5Ho0.5Yb0.5O3 were added to the alumina fibers to enhance thermal stability. The impact of Y0.5Er0.5Ho0.5Yb0.5O3 addition on alumina fibers’ transformation and microstructure evolution of during the sintering process was systematically studied. The influence of single- and two-step sintering processes on the fiber microstructures was elucidated. The results suggested that adding Y0.5Er0.5Ho0.5Yb0.5O3 impeded fiber densification, inhibited alumina grain growth, and enhanced the thermal stability of fibers. Using a two-step sintering process facilitated the achievement of fully dense alumina fibers with fine grains. The alumina fibers added with 1.0 wt% Y0.5Er0.5Ho0.5Yb0.5O3 exhibited a remarkable strength retention rate of up to 93% after exposure to 1200 °C for 10 h. The TEM analysis revealed that rare earth elements segregation at α-Al2O3 grain boundaries due to their larger radius than the Al element contributed to stabilizing the microstructures of α-Al2O3 fibers at high service temperature.

Graphical Abstract

Highlights

  • The addition of Y0.5Er0.5Ho0.5Yb0.5O3 impeded fiber densification, inhibited alumina grain growth.

  • After being held at 1200 °C for 10 h, the strength retention rate of alumina fiber with 1 wt% Y0.5Er0.5Ho0.5Yb0.5O3 is about 93%.

  • Rare earth elements segregate at the grain boundary of alumina fiber, stabilizing the size of fine α-Al2O3 grains.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant no. U20A20240, 52001333).

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Authors and Affiliations

  1. National Key Laboratory of Science and Technology on High-Strength Structural Materials, Central South University, Changsha, 410083, China

    Yutong Chen, Wensheng Liu, Yunzhu Ma & Shuwei Yao

  2. Institute for Advanced Study, Central South University, Changsha, 410083, China

    Wensheng Liu & Juan Wang

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  1. Yutong Chen
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Contributions

YC, JW, WL, YM and SY contributed to the investigation of the study. YC, JW and SY prepared and analyzed the fibers. YC, JW and SY wrote the manuscript. WL and YM gave guidance for the investigation and gave comments on the manuscript. All authors reviewed the manuscript.

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Correspondence to Shuwei Yao or Juan Wang.

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Chen, Y., Liu, W., Ma, Y. et al. Effect of Y0.5Er0.5Ho0.5Yb0.5O3 addition on the microstructure and thermal stability of continuous alumina fibers. J Sol-Gel Sci Technol 110, 619–634 (2024). https://doi.org/10.1007/s10971-024-06393-x

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