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<p>High-entropy oxides are promising thermal barrier coating (TBC) materials owing to their low thermal conductivity. However, they have poor fracture toughness. To overcome this limitation, this study designed a core–shell structural composite oxide. By combining low-toughness La<sub>2</sub>(Zr<sub>0.2</sub>Y<sub>0.2</sub>Yb<sub>0.2</sub>Nb<sub>0.2</sub>Ti<sub>0.2</sub>)<sub>2</sub>O<sub>7</sub>(L(ZYYNT)O) high-entropy oxide and high-toughness yttria-stabilized zirconia (YSZ), a new La<sub>2</sub>(Zr<sub>0.2</sub>Y<sub>0.2</sub>Yb<sub>0.2</sub>Nb<sub>0.2</sub>Ti<sub>0.2</sub>)<sub>2</sub>O<sub>7</sub>@YSZ composite was designed and chemically synthesized. Subsequently, the properties of the composite oxide were evaluated. Results show that the thermal conductivity and coefficient of thermal expansion of the L(ZYYNT)O@YSZ composite-structure ceramic are approximately 1.103&#xa0;W·m<sup>− 1</sup>·K<sup>− 1</sup> at room temperature, after correcting for porosity, and approximately 9.5356 × 10<sup>− 6</sup> K<sup>− 1</sup> at 1000&#xa0;°C, respectively. Moreover, its fracture toughness is approximately 3.45 MPa·m<sup>1/2</sup>, which is 43% higher than that of the L(ZYYNT)O high-entropy oxide. However, the interface formed between L(ZYYNT)O and YSZ was incoherent. The interfacial binding energy between the L(ZYYNT)O high-entropy oxide and the YSZ was determined using a Materials Studio simulation and is approximately 3.315&#xa0;J/m<sup>2</sup>. Thus, the study demonstrates that the L(ZYYNT)O@YSZ composite-structure oxide exhibits potential as a TBC material.</p>

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Study on La2(Zr0.2Y0.2Yb0.2Nb0.2Ti0.2)2O7@YSZ core-shell structural composite oxide for thermal barrier coating

  • 期刊论文

  • 发表日期：

    2026年2月24日

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  • Dongbo Zhang,
  • Ruiqing Song,
  • Jiangrong Yan,
  • Xin Huang,
  • Ning Wang

摘要

High-entropy oxides are promising thermal barrier coating (TBC) materials owing to their low thermal conductivity. However, they have poor fracture toughness. To overcome this limitation, this study designed a core–shell structural composite oxide. By combining low-toughness La2(Zr0.2Y0.2Yb0.2Nb0.2Ti0.2)2O7(L(ZYYNT)O) high-entropy oxide and high-toughness yttria-stabilized zirconia (YSZ), a new La2(Zr0.2Y0.2Yb0.2Nb0.2Ti0.2)2O7@YSZ composite was designed and chemically synthesized. Subsequently, the properties of the composite oxide were evaluated. Results show that the thermal conductivity and coefficient of thermal expansion of the L(ZYYNT)O@YSZ composite-structure ceramic are approximately 1.103 W·m− 1·K− 1 at room temperature, after correcting for porosity, and approximately 9.5356 × 10− 6 K− 1 at 1000 °C, respectively. Moreover, its fracture toughness is approximately 3.45 MPa·m1/2, which is 43% higher than that of the L(ZYYNT)O high-entropy oxide. However, the interface formed between L(ZYYNT)O and YSZ was incoherent. The interfacial binding energy between the L(ZYYNT)O high-entropy oxide and the YSZ was determined using a Materials Studio simulation and is approximately 3.315 J/m2. Thus, the study demonstrates that the L(ZYYNT)O@YSZ composite-structure oxide exhibits potential as a TBC material.