Effective blocking of radiative thermal conductivity in La2Zr2O7/LaPO4 composites for high temperature thermal insulation applications

Yang, Jun; Wan, Chunlei; Zhao, Meng; Shahid, Muhammad; Pan, Wei

doi:10.1016/j.jeurceramsoc.2016.03.010

Cited by 67 publications

(41 citation statements)

References 34 publications

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“…For high‐temperature TBCs, the thermal insulation performance depends on k , and the thermal radiation effect must be eliminated. Dual‐layer coatings are effective in blocking thermal radiation, which is reported in La 2 Zr 2 O 7 /LaPO 4 ceramics, and it is worthy to try with RETaO 4 ceramics …”

Section: Resultsmentioning

confidence: 96%

Thermal expansion performance and intrinsic lattice thermal conductivity of ferroelastic RETaO₄ ceramics

Chen

et al. 2019

J Am Ceram Soc

109

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Ferroelastic RETaO 4 ceramics are promising thermal barrier coatings (TBCs) because of their attractive thermomechanical properties. The influence of crystal structure distortion degree on thermomechanical properties of RETaO 4 is estimated in this work. The relationship between Young's modulus and TECs is determined. The highest TECs (10.7 × 10 −6 K −1 , 1200°C) of RETaO 4 are detected in ErTaO 4 ceramics and are ascribed to its small Young's modulus and low Debye temperature. The intrinsic lattice thermal conductivity (3.94-1.26 W m −1 K −1 , 100-900°C) of RETaO 4 deceases with increasing of temperature due to an elimination in thermal radiation effects. The theoretical minimum thermal conductivity (1.00 W m −1 K −1 ) of RETaO 4 indicates that the experimental value is able to be reduced further. We have delved deeply into the thermomechanical properties of ferroelastic RETaO 4 ceramics and have emphasized their high-temperature applications as TBCs. K E Y W O R D Sband gap, intrinsic lattice thermal conductivity, rare earth tantalates, thermal barrier coatings, thermal expansion performance, Young's modulus

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Section: Resultsmentioning

confidence: 96%

Thermal expansion performance and intrinsic lattice thermal conductivity of ferroelastic RETaO₄ ceramics

Chen

et al. 2019

J Am Ceram Soc

109

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“…Because, the ( λ r ) was not obvious at low temperature, but the heat radiation increased sharply after 500°C . Radiative conductivity ( λ r ) could be explained by Equation

λ_{normalr} = \frac{16 σ n^{2} T^{3}}{3 ρ e},

where σ is the Stefen‐Boltzmann constant, n is the effective index of refraction, e is the effective specific extinction coefficient.…”

Section: Resultsmentioning

confidence: 99%

Preparation and characteristics of porous anorthite ceramics with high porosity and high‐temperature strength

et al. 2019

Int J Applied Ceramic Tech

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High-temperature properties including compressive strength, thermal shock behavior, and thermal conductivity of porous anorthite ceramics with high specific strength were tested and analyzed. The results showed that the prepared materials merit hightemperature compressive strength, thermal stability, and conductivity. With the appropriate fabrication parameters, even though containing 0.33 g/cm 3 bulk density and 88.2% porosity, its compressive strength could reach 2.03 MPa at 1000°C, 147% of that at room temperature; the residual strength ratio kept as 114.7% after a thermal shock at 1200°C. The X-ray diffraction (XRD), scanning electron microscope (SEM) and transmission electron microscope (TEM) showed that anorthite grains refinement and intergranular voids filling by liquid phase were main factors for the high strength. From room temperature to 1200°C, its thermal conductivity only varied from 0.085 to 0.258 W·(m·K) −1 . High porosity, a large number of nanoregions in anorthite grains and amorphous phase in grain boundary were main reasons for low thermal conductivity. K E Y W O R D S anorthite, porous materials, strength, thermal conductivity How to cite this article: Wu L, Li C, Li H, et al. Preparation and characteristics of porous anorthite ceramics with high porosity and high-temperature strength. Int J Appl Ceram Technol. 2020;17:963-973.

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“…In experiments, the thermal conductivity is calculated by:

κ_{expt} = D_{th} \cdot c_{normalp} \cdot ρ

, where D th and c p are the thermal diffusivity and the specific heat capacity, respectively. Here, the heat capacity is calculated according to Neumann‐Kopp law, which has been proved a reliable method for solid solutions and composites, such as Ce 1− x Sm x O 2− x /2 , (Y x Yb 1− x ) 2 SiO 5 , La 2 Zr 2 O 7 /LaPO 4 composites and yttria‐stabilized ZrO 2 . The temperature‐dependent thermal diffusivity D th and heat capacity c p of Ca 1− x Sr x ZrO 3 are plotted in Figure .…”

Section: Resultsmentioning

confidence: 99%

High‐temperature mechanical and thermal properties of Ca₁₋_xSr_xZrO₃solid solutions

et al. 2019

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Perovskite oxides are promising thermal barrier coatings (TBCs) materials but their thermophysical properties still need to be further improved before commercial applications. In this work, mechanical/thermal properties of calcium‐strontium zirconate solid solutions (Ca1−xSrxZrO3) are investigated. Comparing to the end‐compounds CaZrO3 and SrZrO3, the solid solutions achieve the enhanced thermal expansion coefficient, decreased thermal conductivity as well as good high‐temperature mechanical properties. The experimental thermal conductivities of Ca1−xSrxZrO3 (x = 0.2, 0.4, 0.6, 0.8) are in the range of 1.76‐1.94 W·(m·K)−1 at 1073 K, being lower than that of the yttria‐stabilized zirconia (YSZ). At the same time, their thermal expansion coefficients (10.75 × 10−6‐11.23 × 10−6/K at 1473 K) are comparable to that of YSZ. Moreover, the Young's moduli of Ca0.8Sr0.2ZrO3, Ca0.6Sr0.4ZrO3, Ca0.4Sr0.6ZrO3, and Ca0.2Sr0.8ZrO3 at 1473 K are 70.7%, 69.4%, 68.8%, and 71.1% of the corresponding values at room temperature, respectively. The good high‐temperature mechanical and thermal properties ensure the potential applications of Ca1−xSrxZrO3 solid solutions as high‐temperature thermal insulation materials including TBCs.

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Effective blocking of radiative thermal conductivity in La2Zr2O7/LaPO4 composites for high temperature thermal insulation applications

Cited by 67 publications

References 34 publications

Thermal expansion performance and intrinsic lattice thermal conductivity of ferroelastic RETaO₄ ceramics

Thermal expansion performance and intrinsic lattice thermal conductivity of ferroelastic RETaO₄ ceramics

Preparation and characteristics of porous anorthite ceramics with high porosity and high‐temperature strength

High‐temperature mechanical and thermal properties of Ca₁₋_xSr_xZrO₃solid solutions

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Effective blocking of radiative thermal conductivity in La2Zr2O7/LaPO4 composites for high temperature thermal insulation applications

Cited by 67 publications

References 34 publications

Thermal expansion performance and intrinsic lattice thermal conductivity of ferroelastic RETaO4 ceramics

Thermal expansion performance and intrinsic lattice thermal conductivity of ferroelastic RETaO4 ceramics

Preparation and characteristics of porous anorthite ceramics with high porosity and high‐temperature strength

High‐temperature mechanical and thermal properties of Ca1−xSrxZrO3solid solutions

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Product

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Thermal expansion performance and intrinsic lattice thermal conductivity of ferroelastic RETaO₄ ceramics

Thermal expansion performance and intrinsic lattice thermal conductivity of ferroelastic RETaO₄ ceramics

High‐temperature mechanical and thermal properties of Ca₁₋_xSr_xZrO₃solid solutions