Enhancing the thermal insulating properties of lanthanum zirconate porous ceramics via pore structure tailoring

Meng, Xuanyu; Xu, Jie; Zhu, Jiatong; Zhao, Jia; Wei, Mingyue; Yang, Runwu; Gao, Feng

doi:10.1016/j.jeurceramsoc.2021.05.032

Cited by 15 publications

(8 citation statements)

References 38 publications

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“…However, AlN' or β-SiAlON exists as impurity phase inevitably, and none of those reports take comprehensive study of wave transmittance, thermal insulation and mechanical properties (particularly flexural strength) of the prepared α-SiAlON porous ceramics. Therefore, gel-casting is a reasonable and effective method that involves in situ curing of powders through gelation of monomers to obtain α-SiAlON porous ceramics with moderate porosity, uniform structure and properties preferentially [19,20], and highpurity α-SiAlON powder is necessary for obtaining porous ceramics with excellent properties.…”

Section: J U S T a C C E P T E Dmentioning

confidence: 99%

“…With increasing shear rate, the slurries showed the characteristic of shear thinning. This is because the particles gradually disperse evenly at a high-speed shear rate and move orderly along the shear direction, which can reduce the internal friction and further reduce the viscosity [20,27]. When the shear rate reached approximately 500 s -1 , the viscosity of slurries was stable at 0.01-0.03 Pa•s.…”

Section: (E)mentioning

confidence: 99%

“…At 380 �, PAM macromolecules J u s t A c c e p t e d obtained from monomer polymerisation gradually decomposed, and the molecular weight decreased. With the temperature further increasing to 550 �, the decomposed small molecules were oxidised and degraded until up to 620 � [20]. Therefore, the maximum temperature for complete removal of organics was determined to be 620 �, and the heat preservation platforms were set at 380, 550, and 620 � during the debinding process.…”

Section: J U S T a C C E P T E Dmentioning

confidence: 99%

“…Calculation using this formula revealed that the sample of 10- As shown in Fig. 12(b, c), the thermal conductivity of Y-α-SiAlON porous ceramics was fitted according to the EMT model using the following formula [20]:…”

Section: J U S T a C C E P T E Dmentioning

confidence: 99%

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High wave transmittance and low thermal conductivity Y– α-SiAlON porous ceramics for high-temperature radome applications

Yang¹,

Xu²,

Guo³

et al. 2023

Journal of Advanced Ceramics

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With the development of hypersonic vehicles technology, ceramic based radome materials are highly demanded due to their high operating temperatures, good dielectric properties, and high mechanical properties. Although α-SiAlON is an ideal material for radome application, its intrinsic low transmittance and high thermal conductivity limit its application. Herein, we prepared Y-α-SiAlON porous ceramics through tert-butanol gel-casting using self-synthesised α-SiAlON powder. Y-α-SiAlON porous ceramics exhibited a uniform micron-level connected pore structure with a porosity of 44.2%-58.6%. The real part of permittivity was 3.13-4.18 (8.2-12.4 GHz), which decreased significantly with increasing porosity. The wave transmittance of the sample with a porosity of 58.6% could exceed 80% in the thickness range of 6-10 mm. The thermal conductivity maintained at a low level of 1.38-2.25 W•m -1 •K -1 owing to the introduction of the pore structure. The flexural strength was 44.75-88.33 MPa, which may be increased by rod-like α-SiAlON grains. The results indicate that the prepared Y-α-SiAlON porous ceramics meet the requirements of high-temperature wave-transmitting materials for radome application.

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Section: J U S T a C C E P T E Dmentioning

confidence: 99%

Section: (E)mentioning

confidence: 99%

Section: J U S T a C C E P T E Dmentioning

confidence: 99%

Section: J U S T a C C E P T E Dmentioning

confidence: 99%

See 2 more Smart Citations

High wave transmittance and low thermal conductivity Y– α-SiAlON porous ceramics for high-temperature radome applications

Yang¹,

Xu²,

Guo³

et al. 2023

Journal of Advanced Ceramics

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“…3–6 Compared with the commonly used oxide ceramic fibers, such as SiO 2 , ZrO 2 and mullite fibers, La 2 Zr 2 O 7 fibers with low sintering ability will not be limited by their poor thermal stability or high thermal conductivity at high temperatures. 7,8…”

Section: Introductionmentioning

confidence: 99%

Anin situ hyperconnective network strategy to prepare lanthanum zirconate nanofiber membranes with superior flexibility and toughness

Zhang

Liu

et al. 2023

J. Mater. Chem. A

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Porous high-entropy rare-earth phosphate (REPO4, RE = La, Sm, Eu, Ce, Pr and Gd) ceramics with excellent thermal insulation performance via pore structure tailoring

Zhang,

Wang,

Liu

et al. 2024

Int J Miner Metall Mater

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Enhancing the thermal insulating properties of lanthanum zirconate porous ceramics via pore structure tailoring

Cited by 15 publications

References 38 publications

High wave transmittance and low thermal conductivity Y– α-SiAlON porous ceramics for high-temperature radome applications

High wave transmittance and low thermal conductivity Y– α-SiAlON porous ceramics for high-temperature radome applications

Anin situ hyperconnective network strategy to prepare lanthanum zirconate nanofiber membranes with superior flexibility and toughness

Porous high-entropy rare-earth phosphate (REPO4, RE = La, Sm, Eu, Ce, Pr and Gd) ceramics with excellent thermal insulation performance via pore structure tailoring

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