Highly porous (La1/5Nd1/5Sm1/5Gd1/5Yb1/5)2Zr2O7 ceramics with ultra-low thermal conductivity

Liu, Debao; Zhou, Zhiliang; Wang, Yiguang; Jin, Xiaochao

doi:10.1016/j.ceramint.2022.05.330

Cited by 14 publications

(4 citation statements)

References 56 publications

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“… Comparison of the compressive strength and thermal conductivity of the obtained porous HECs with other porous UHTCs from previous reports [ 18 , 30 , 31 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 ]. …”

Section: Figurementioning

confidence: 92%

Dual-Porosity (Ta0.2Nb0.2Ti0.2Zr0.2Hf0.2)C High-Entropy Ceramics with High Compressive Strength and Low Thermal Conductivity Prepared by Pressureless Sintering

Yang

Ouyang

et al. 2023

Materials

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Porous (Ta0.2Nb0.2Ti0.2Zr0.2Hf0.2)C high-entropy ceramics (HEC) with a dual-porosity structure were fabricated by pressureless sintering using a mixture powder of ceramic precursor and SiO2 microspheres. The carbothermal reduction in the ceramic precursor led to the formation of pores with sizes of 0.4–3 μm, while the addition of SiO2 microspheres caused the appearance of pores with sizes of 20–50 μm. The porous HECs exhibit competitive thermal insulation (4.12–1.11 W·m−1 k−1) and extraordinary compressive strength (133.1–41.9 MPa), which can be tailored by the porosity of the ceramics. The excellent properties are ascribed to the high-entropy effects and dual-porosity structures. The severe lattice distortions in the HECs lead to low intrinsic thermal conductivity and high compressive strength. The dual-porosity structure is efficient at phonon scattering and inhabiting crack propagations, which can further improve the thermal insulation and mechanical properties of the porous HECs.

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Section: Figurementioning

confidence: 92%

Dual-Porosity (Ta0.2Nb0.2Ti0.2Zr0.2Hf0.2)C High-Entropy Ceramics with High Compressive Strength and Low Thermal Conductivity Prepared by Pressureless Sintering

Yang

Ouyang

et al. 2023

Materials

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“…Since thermal insulation provides safety and longevity to heatbased equipment such as the turbines and blades of airplanes and aerospace, research has been undergoing intensively to reduce the thermal conductivity of possible materials. For example, titanatebased ceramics, [1] composite materials, [2] zirconia, and yttriabased materials, [3] etc. have been under study for low thermal conductivity.…”

Section: Introductionmentioning

confidence: 99%

“…Perovskite oxides are represented by a general formula of ABO 3 where A and B represent alkaline earth or rare earth metal and transition metal, respectively. An ideal perovskite oxide exhibits a cubic structure with A cations surrounded by BO 6 octahedra, B cations at the center of octahedra, and O anions at the corners of the octahedra.…”

Section: Introductionmentioning

confidence: 99%

Study of Thermal Insulation Nature of A2Fe2O6-δ (A and A’ = Ca, Sr)

Hona

2024

ETOAJ

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Materials with low thermal conductivity have been used in thermoelectrics, electronics, solar devices, and land base and aerospace gas turbines to prevent heat dissipation and provide safety and longevity of equipment. We report Ca2Fe2O6-δ, and Sr2Fe2O6-δ for their low thermal conductivities. These compounds are vacancy-ordered oxygen-deficient perovskites but with different vacancy arrangements. Ca2Fe2O6-δ has a brownmillerite type structure while Sr2Fe2O6-δ has a different structure.

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“…Liu et al prepared (La 0.2 Nd 0.2 Sm 0.2 Gd 0.2 Yb 0.2 ) 2 Zr 2 O 7 porous ceramics by a foam-gel casting-freeze drying method, which had excellent and relatively low thermal conductivity (0.072 ± 0.001 W/(m•K)). The high-entropy porous ceramics with high porosity (93.3%) also possessed good and relatively high compressive strength (1.20 MPa) [23]. Meng et al used a particle-stabilized foaming method to prepare pyrochlore-fluorite dual-phase porous ceramics (La 0.2 Nd 0.2 Sm 0.2 Gd 0.2 Yb 0.2 ) 2 Zr 2 O 7 .…”

Section: Introductionmentioning

confidence: 99%

Rare-Earth-Zirconate Porous High-Entropy Ceramics with Unique Pore Structures for Thermal Insulating Applications

Wang

Zhu

et al. 2023

Materials

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Porous high-entropy ceramics are a new alternative material for thermal insulation. Their better stability and low thermal conductivity are due to lattice distortion and unique pore structures. In this work, rare-earth-zirconate ((La0.25Eu0.25Gd0.25Yb0.25)2(Zr0.75Ce0.25)2O7) porous high-entropy ceramics were fabricated by a tert-butyl alcohol (TBA)-based gel-casting method. The regulation of pore structures was realized through changing different initial solid loadings. The XRD, HRTEM, and SAED results showed that the porous high-entropy ceramics had a single fluorite phase without impurity phases, exhibiting high porosity (67.1–81.5%), relatively high compressive strength (1.02–6.45 MPa) and low thermal conductivity (0.0642–0.1213 W/(m·K)) at room temperature. Porous high-entropy ceramics with 81.5% porosity demonstrated excellent thermal properties, showing a thermal conductivity of 0.0642 W/(m·K) at room temperature and 0.1467 W/(m·K) at 1200 °C. The unique pore structure with a micron size contributed to its excellent thermal insulating performance. This present work provides the prospect that rare-earth-zirconate porous high-entropy ceramics with tailored pore structures are expected to be thermal insulation materials.

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Highly porous (La1/5Nd1/5Sm1/5Gd1/5Yb1/5)2Zr2O7 ceramics with ultra-low thermal conductivity

Cited by 14 publications

References 56 publications

Dual-Porosity (Ta0.2Nb0.2Ti0.2Zr0.2Hf0.2)C High-Entropy Ceramics with High Compressive Strength and Low Thermal Conductivity Prepared by Pressureless Sintering

Dual-Porosity (Ta0.2Nb0.2Ti0.2Zr0.2Hf0.2)C High-Entropy Ceramics with High Compressive Strength and Low Thermal Conductivity Prepared by Pressureless Sintering

Study of Thermal Insulation Nature of A2Fe2O6-δ (A and A’ = Ca, Sr)

Rare-Earth-Zirconate Porous High-Entropy Ceramics with Unique Pore Structures for Thermal Insulating Applications

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