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<p>The advent of multicomponent design strategies has revolutionized the development of rare earth silicate environmental barrier coatings (EBCs), enabling precise tailoring of critical properties including thermal expansion coefficients and environmental durability. While this paradigm shift provides unprecedented material design flexibility, it simultaneously imposes significant processing challenges during plasma spray deposition, stemming from the inherent compositional complexity and metastable phase competition in multicomponent systems. This study presents the development of a novel multicomponent rare earth disilicate EBC, (Er<sub>1/4</sub>Tm<sub>1/4</sub>Yb<sub>1/4</sub>Lu<sub>1/4</sub>)<sub>2</sub>Si<sub>2</sub>O<sub>7</sub>, with systematic characterization of its microstructure, phase stability, thermophysical properties and thermal cycling performance. The results indicate that the as-prepared (Er<sub>1/4</sub>Tm<sub>1/4</sub>Yb<sub>1/4</sub>Lu<sub>1/4</sub>)<sub>2</sub>Si<sub>2</sub>O<sub>7</sub> coating exhibits a dense and uniform structure without significant segregation of RE elements. Thermal property measurements reveal a thermal conductivity of 1.25&#xa0;W(m&#xa0;K) at 1673 K and an average coefficient of thermal expansion from 473 to 1473 K of 4.81 × 10<sup>−6</sup> K<sup>−1</sup>. Moreover, the (Er<sub>1/4</sub>Tm<sub>1/4</sub>Yb<sub>1/4</sub>Lu<sub>1/4</sub>)<sub>2</sub>Si<sub>2</sub>O<sub>7</sub>/Si EBC system demonstrates excellent thermal shock resistance, capable of withstanding at least 500 thermal shock cycles at 1350&#xa0;°C, with the thickness of the thermally grown oxide layer after 500 cycles being only 2.35 ± 0.89 μm.</p>

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Preparation, Thermal Properties and Thermal Shock Resistance of Novel (Er1/4Tm1/4Yb1/4Lu1/4)2Si2O7 Environmental Barrier Coating

  • 期刊论文

  • 发表日期：

    2025年9月25日

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  • Luchao Sun,
  • Lingxuan Yan,
  • Ziyu Wang,
  • Yixiu Luo,
  • Yang Cui,
  • Tiefeng Du,
  • Zhixin Luo,
  • Haoyu Wang,
  • Jingyang Wang

摘要

The advent of multicomponent design strategies has revolutionized the development of rare earth silicate environmental barrier coatings (EBCs), enabling precise tailoring of critical properties including thermal expansion coefficients and environmental durability. While this paradigm shift provides unprecedented material design flexibility, it simultaneously imposes significant processing challenges during plasma spray deposition, stemming from the inherent compositional complexity and metastable phase competition in multicomponent systems. This study presents the development of a novel multicomponent rare earth disilicate EBC, (Er1/4Tm1/4Yb1/4Lu1/4)2Si2O7, with systematic characterization of its microstructure, phase stability, thermophysical properties and thermal cycling performance. The results indicate that the as-prepared (Er1/4Tm1/4Yb1/4Lu1/4)2Si2O7 coating exhibits a dense and uniform structure without significant segregation of RE elements. Thermal property measurements reveal a thermal conductivity of 1.25 W(m K) at 1673 K and an average coefficient of thermal expansion from 473 to 1473 K of 4.81 × 10−6 K−1. Moreover, the (Er1/4Tm1/4Yb1/4Lu1/4)2Si2O7/Si EBC system demonstrates excellent thermal shock resistance, capable of withstanding at least 500 thermal shock cycles at 1350 °C, with the thickness of the thermally grown oxide layer after 500 cycles being only 2.35 ± 0.89 μm.