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<p>The paper provides data on the development of two-layer, multilayer, and functionally graded thermal barrier coatings (TBCs), where zirconates, hafnates, and cerates of rare earth elements, LaMgAl<sub>11</sub>O<sub>19</sub> (LMA), LaTi<sub>2</sub>Al<sub>9</sub>O<sub>19</sub> (LTA), and LaPO<sub>4</sub>, phases, Al<sub>2</sub>O<sub>3</sub> corundum, and their various combinations serve as the top thermal barrier layer and yttria-stabilized zirconia (YSZ) serves as the bottom layer. The two-layer and multilayer structures exhibit better characteristics than the conventional YSZ coatings and single-layer coatings from the above compounds. This new coating architecture can mitigate the drawbacks of these phases: high sinterability, low fracture toughness, low coefficient of thermal expansion, interaction with the underlying YSZ layer, and low resistance to hot corrosion caused by Ca–Mg–Al silicates (CMAS attack). The most promising topcoat material considered in this paper is La<sub>2</sub>Ce<sub>2</sub>O<sub>7</sub> lanthanum cerate, as it combines the most suitable properties for the development of new high-temperature two-layer TBCs. The weaknesses of this phase can be reduced through structural modification of the La<sub>2</sub>Ce<sub>2</sub>O<sub>7</sub> ceramic layer by scientifically grounded selection of methods and parameters for applying both TBC layers and through the control of their thickness. Thus, most disadvantages can be eliminated by the application of two-layer, multilayer, and functionally graded coatings. Since no single material meets all requirements for hightemperature thermal barrier coatings, two-layer ceramic coatings can be an important area for the development of TBCs.</p>

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Multilayer Coatings as a New Stage in the Development of Modern Highly Effective Thermal Barrier Coatings III. Two-Layer Ln2Zr2O7/YSZ and Other Thermal Barrier Coatings

  • 期刊论文

  • 发表日期：

    2025年9月1日

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  • S. M. Lakiza,
  • M. I. Hrechaniuk,
  • A. O. Makudera,
  • I. O. Marek,
  • O. K. Ruban,
  • V. P. Red’ko,
  • V. B. Shmybelskii,
  • O. V. Dudnik

摘要

The paper provides data on the development of two-layer, multilayer, and functionally graded thermal barrier coatings (TBCs), where zirconates, hafnates, and cerates of rare earth elements, LaMgAl11O19 (LMA), LaTi2Al9O19 (LTA), and LaPO4, phases, Al2O3 corundum, and their various combinations serve as the top thermal barrier layer and yttria-stabilized zirconia (YSZ) serves as the bottom layer. The two-layer and multilayer structures exhibit better characteristics than the conventional YSZ coatings and single-layer coatings from the above compounds. This new coating architecture can mitigate the drawbacks of these phases: high sinterability, low fracture toughness, low coefficient of thermal expansion, interaction with the underlying YSZ layer, and low resistance to hot corrosion caused by Ca–Mg–Al silicates (CMAS attack). The most promising topcoat material considered in this paper is La2Ce2O7 lanthanum cerate, as it combines the most suitable properties for the development of new high-temperature two-layer TBCs. The weaknesses of this phase can be reduced through structural modification of the La2Ce2O7 ceramic layer by scientifically grounded selection of methods and parameters for applying both TBC layers and through the control of their thickness. Thus, most disadvantages can be eliminated by the application of two-layer, multilayer, and functionally graded coatings. Since no single material meets all requirements for hightemperature thermal barrier coatings, two-layer ceramic coatings can be an important area for the development of TBCs.