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High Throughput Screening of CMAS Corrosion-Resistant RETaO4 Based on Lamination Method.

Zhilin Tian1,2, Zhilin Chen1, Shuping Wen1

  • 1School of Materials, Shenzhen Campus of Sun Yat-sen University, Shenzhen, 518107, China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|February 17, 2025
PubMed
Summary

Rare earth tantalates resist calcium-magnesium-aluminosilicate (CMAS) corrosion better with smaller rare earth ions. This study reveals how rare earth species influence CMAS corrosion mechanisms in thermal barrier coatings.

Keywords:
CMAS corrosionhigh throughputrare earth ionic radiirare earth tantalatesthermal barrier coatings

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Area of Science:

  • Materials Science
  • Ceramic Engineering
  • Corrosion Science

Background:

  • Rare earth tantalates (RETaO4) exhibit excellent thermomechanical properties for advanced thermal barrier coatings (TBCs).
  • Understanding the impact of rare earth (RE) elements on CMAS corrosion is crucial for designing effective RETaO4-based TBCs.
  • Current knowledge on RE species' role in CMAS corrosion mechanisms of RETaO4 is limited.

Purpose of the Study:

  • To systematically investigate the CMAS corrosion mechanisms of various RETaO4 materials.
  • To elucidate the influence of rare earth ionic radius on CMAS corrosion behavior and product formation.
  • To provide guidelines for developing CMAS-resistant TBCs.

Main Methods:

  • High-throughput experimentation to study CMAS corrosion of RETaO4 (RE = Nd, Sm, Eu, Gd, Dy, Ho, Y, Er) at 1300 °C.
  • Microstructural and compositional analysis of corrosion products.
  • First-principles calculations to determine formation enthalpies.
  • High-temperature wetting experiments.

Main Results:

  • Primary corrosion products identified as (Ca2-xREx)(Ta2-y-zMgyAlz)O7 solid solutions and Ca2RE8(SiO4)6O2 apatite.
  • CMAS infiltration depth increases with increasing RE ionic radius.
  • Corrosion product formation enthalpy becomes more exothermic with larger RE ionic radii.
  • RETaO4 with smaller RE ionic radii exhibit superior corrosion resistance due to reduced wetting.

Conclusions:

  • The rare earth ionic radius significantly dictates the CMAS corrosion behavior of RETaO4.
  • Smaller RE ionic radii enhance CMAS corrosion resistance in RETaO4 TBCs.
  • Findings offer a pathway for rapid screening and design of novel CMAS-resistant TBC materials.