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Phase Composition and Thermal Properties of Yb-Gd Co-Doped SrZrO3 Coating Prepared by the Solution Precursor Plasma Spray

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Abstract

Three different double rare-earth modified SrZrO3 coatings [Sr(Zr0.9Yb0.05Gd0.05)O2.95 (SZYG-1), Sr(Zr0.85Yb0.075Gd0.075)O2.925 (SZYG-2) and Sr(Zr0.8Yb0.1Gd0.1)O2.9 (SZYG-3)] were prepared by solution precursor plasma spray. X-ray diffraction results show that the SZYG-1 coating is composed of SrZrO3 solid solution and ZrO2 solid solution with fluorite structure, while the SZYG-2 and SZYG-3 coatings include SrZrO3 solid solution and rare-earth oxide solid solution with cubic structure. The thermal conductivity of the as-sprayed SZYG-2 coating is 0.69 W m−1 K−1 (1000 °C), which is the lowest among the three modified SrZrO3 coatings and is about 45% lower than that of SrZrO3 coating (1.25 W m−1 K−1, 1000 °C). Among the three modified SrZrO3 coatings, the increase of thermal conductivity of the SZYG-1 coating after heat treatment is the smallest. The thermal expansion coefficients of the as-sprayed SZYG-1, SZYG-2 and SZYG-3 coatings are 10.5 × 10−6 K−1, 10.5 × 10−6 K−1 and 10.1 × 10−6 K−1, respectively. The sintering coefficients of the SZYG-1, SZYG-2 and SZYG-3 coatings are 3.5 × 10−7 s−1, 6.59 × 10−6 s−1 and 8 × 10−6 s−1, respectively. The SZYG-1 coating has the best sintering resistance, followed by the SZYG-2 coating and the SZYG-3 coating. The SZYG-1 coating has good phase stability, low thermal conductivity, better sintering resistance, which is considered as a promising novel TBC material.

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Acknowledgments

This work was financially supported by the National Natural Science Foundation of China (52062040, 51672136, 51865044), National Science and Technology Major Project (2017-VII-0012-0108), Science and Technology Projects of Inner Mongolia Autonomous Region (2018-810, 2019-1356), and Aeronautical Science Foundation of China (201838Y3001).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Inner Mongolia University of Technology, Hohhot, 010051, China

    Yuanming Gao, Wen Ma, Enbo Li, Yu Bai, Weidong Chen & Ruiling Jia

  2. Inner Mongolia Key Laboratory of Thin Film and Coatings Technology, Hohhot, 010051, China

    Yuanming Gao, Wen Ma, Enbo Li, Yu Bai, Weidong Chen & Ruiling Jia

  3. Department of Mechanical Engineering, Liaoning Engineering Vocational College, Tieling, 112008, China

    Xiangfeng Meng

  4. School of Chemical Engineering, Inner Mongolia University of Technology, Hohhot, 010051, China

    Hongying Dong

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  1. Yuanming Gao
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Correspondence to Wen Ma.

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Gao, Y., Ma, W., Meng, X. et al. Phase Composition and Thermal Properties of Yb-Gd Co-Doped SrZrO3 Coating Prepared by the Solution Precursor Plasma Spray. J Therm Spray Tech 30, 1174–1182 (2021). https://doi.org/10.1007/s11666-021-01201-2

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  • DOI: https://doi.org/10.1007/s11666-021-01201-2

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