A novel composite-layered coating enabling self-enhancing thermal barrier performance

Li, Chang-Jiu; Wang, Li-Shuang; Yang, Guan–Jun

doi:10.1016/j.scriptamat.2019.01.010

Cited by 82 publications

(27 citation statements)

References 76 publications

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“…However, when the operating temperature is higher than 1200°C, the t′ phase will decompose into the equilibrium phase tetragonal (t) phase and cubic (c) phase. The martensite transformation of the tetragonal phase to the monoclinic phase (m) phase occurs during cooling and produces a volume expansion of about 3% to 5%, which leads to a large number of cracks under long‐term thermal cycling conditions and accelerating the premature failure of the coating . Therefore, the operate temperature of YSZ is limited to 1200°C .…”

Section: Introductionmentioning

confidence: 99%

“…The martensite transformation of the tetragonal phase to the monoclinic phase (m) phase occurs during cooling and produces a volume expansion of about 3% to 5%, which leads to a large number of cracks under long-term thermal cycling conditions and accelerating the premature failure of the coating. 8,9 Therefore, the operate temperature of YSZ is limited to 1200°C. 10 As aero-engines and gas turbines are moving toward higher thrust-to-weight ratios and higher efficiency, the traditional YSZ ceramics have been unable to meet the ever-increasing operating temperatures of engines, so looking for novel insulation materials to replace YSZ has become the research focus in the field of TBCs.…”

Section: Introductionmentioning

confidence: 99%

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The thermo‐mechanical properties and ferroelastic phase transition of RENbO₄(RE = Y, La, Nd, Sm, Gd, Dy, Yb) ceramics

Zhou

et al. 2019

J Am Ceram Soc

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In this work, RENbO4 (RE = Y, La, Nd, Sm, Gd, Dy, Yb) ceramics with low density, low Young's modulus, low thermal conductivity, and high thermal expansion have been systematically investigated, the excellent thermo‐mechanical properties indicate that RENbO4 ceramics possess the potential as the new generation of thermal barrier coatings (TBCs) materials. X‐ray diffraction and Raman spectroscopy phase structure identification reveal that all dense bulk specimens obtained by high‐temperature solid‐state reaction belonged to the monoclinic (m) phase with C12/c1 space group. The ferroelastic domains are detected in the specimens, revealing the ferroelastic transformation between tetragonal (t) and monoclinic (m) phases of RENbO4 ceramics. The Young's modulus and hardness of the RENbO4 ceramics measured by the NanoBlitz 3D nanoindentation method are discussed in details, and the lower Young's modulus (60‐170 GPa) and higher hardness (the maximum value reaches 11.48 GPa) indicating that higher resistance of RENbO4 ceramics to failure and damage. Lower thermal conductivity (1.42‐2.21 W [m k]−1 at 500°C‐900°C) and lower density (5.330‐7.400 g/cm3) than other typical TBCs materials give RENbO4 ceramics the unique advantage of being new TBCs materials. Meanwhile, the thermal expansion coefficients of RENbO4 ceramics reach 9.8‐11.6 × 10−6 k−1 and are comparable or higher than other typical TBCs materials. According to the first‐order derivative of the thermal expansion rate, the temperature of the ferroelastic transformation of RENbO4 ceramics can be observed.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The thermo‐mechanical properties and ferroelastic phase transition of RENbO₄(RE = Y, La, Nd, Sm, Gd, Dy, Yb) ceramics

Zhou

et al. 2019

J Am Ceram Soc

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“…It has been reported that improving strain tolerance of the ceramic topcoat via the microstructure and composition can dramatically improve the durability of TBCs. Presently, the typical microstructure of the YSZ coating that experts focus on are quasi-columnar YSZ coatings prepared by plasma-sprayed physical-vapor deposition (PS-PVD) [26][27][28][29][30] or suspension plasma spraying (SPS) [31,32]; columnar YSZ coating deposited by electron-beam physical-vapor deposition (EB-PVD) [33][34][35]; segmentation cracks in ceramic topcoat [36,37], the double-layer structure of ceramic coatings [38], and self-enhancing ceramic coating [39].…”

Section: Introductionmentioning

confidence: 99%

The Evaluation of Durability of Plasma-Sprayed Thermal Barrier Coatings with Double-layer Bond Coat

Peng

Dong

et al. 2019

Coatings

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The durability of atmospheric plasma-sprayed thermal barrier coatings (APS TBCs) with a double-layer bond coat was evaluated via isothermal cycling tests under 1120 °C. The bond coat consisted of a porosity layer deposited on the substrate and an oxidation layer deposited on the porosity layer. Two types of double-layer bond coats with different thickness ratios of the porosity layer to the oxidation layer (type A: 1:2 and type B: 2:1, respectively) were prepared. The results show that the porosity layer was oxidation free, the oxidation layer included a fraction of well-distributed α-Al2O3. The coefficient of thermal expansion of the oxidation layer was about 11.2 × 10−6 K−1, which was rather lower than that of the porosity layer. Thus, the oxidation layer can be regards as a secondary bond coat between ceramic topcoat and traditional bond coat. The thermal cyclic lifetime of type A TBCs was about 60 cycles, which exceeded 1.2 times the durability of type B TBCs. The delamination cracks in both TBCs all propagated in the ceramic topcoat, which were all identical to those in traditional TBCs. Therefore, the design of the double-layer bond coat affected the stress level rather than the stress distribution in TBCs.

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“…The detection of surface cracks has always been a key issue in structure safety and reliability in thermal barrier coatings [1][2][3][4], thin films, and other coating-like structures [5][6][7][8]. Surface cracks, including horizontal cracks and vertical cracks, significantly threaten the safety and reliability of coatings.…”

Section: Introductionmentioning

confidence: 99%

“…The extension of horizontal cracks causes the delamination of coatings [1,2]. The vertical cracks in coatings can extend to the interior of a structure and lead to its failure [2][3][4]. To avoid further disasters caused by surface cracks and to prevent their potential risk, the detection and location of surface cracks are key preconditions.…”

Section: Introductionmentioning

confidence: 99%

A New Grating Thermography for Nondestructive Detection of Cracks in Coatings: Fundamental Principle

Zhang

et al. 2019

Coatings

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It is important to detect the surface and/or subsurface cracks in coatings because the cracks usually indicate the failure of the system. Conventional detection techniques face two main challenges. One is the locating of the shallow cracks or defects in thin coatings. The other is the detection of the vertical cracks. Conventional infrared thermography can efficiently detect the horizontal cracks or defects. However, when locating the shallow cracks, it requires a high sampling frequency which is unrealistic for most of the infrared cameras. In terms of the vertical cracks, it is invalid since the propagation of its detecting signal is parallel to the cracks and does not interact with them. We introduce a new grating thermography method to overcome the two difficulties. In this paper we mainly illustrate its fundamental principle, which is validated by numerical simulations and a simple experiment. Overall, the principle analysis shows that grating thermography is highly effective in detecting cracks in coatings.

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A novel composite-layered coating enabling self-enhancing thermal barrier performance

Cited by 82 publications

References 76 publications

The thermo‐mechanical properties and ferroelastic phase transition of RENbO₄(RE = Y, La, Nd, Sm, Gd, Dy, Yb) ceramics

The thermo‐mechanical properties and ferroelastic phase transition of RENbO₄(RE = Y, La, Nd, Sm, Gd, Dy, Yb) ceramics

The Evaluation of Durability of Plasma-Sprayed Thermal Barrier Coatings with Double-layer Bond Coat

A New Grating Thermography for Nondestructive Detection of Cracks in Coatings: Fundamental Principle

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A novel composite-layered coating enabling self-enhancing thermal barrier performance

Cited by 82 publications

References 76 publications

The thermo‐mechanical properties and ferroelastic phase transition of RENbO4(RE = Y, La, Nd, Sm, Gd, Dy, Yb) ceramics

The thermo‐mechanical properties and ferroelastic phase transition of RENbO4(RE = Y, La, Nd, Sm, Gd, Dy, Yb) ceramics

The Evaluation of Durability of Plasma-Sprayed Thermal Barrier Coatings with Double-layer Bond Coat

A New Grating Thermography for Nondestructive Detection of Cracks in Coatings: Fundamental Principle

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The thermo‐mechanical properties and ferroelastic phase transition of RENbO₄(RE = Y, La, Nd, Sm, Gd, Dy, Yb) ceramics

The thermo‐mechanical properties and ferroelastic phase transition of RENbO₄(RE = Y, La, Nd, Sm, Gd, Dy, Yb) ceramics