Preparation of porous YSZ ceramics by ball milling foaming-freeze drying process

Lang, Ying; Zhao, Lin; Dai, Xin; Wang, Chang‐An

doi:10.1016/j.ceramint.2019.12.258

Cited by 11 publications

(6 citation statements)

References 14 publications

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“…As can be seen, porous (Y 0.25 Ho 0.25 Yb 0.25 Lu 0.25 ) 2 Si 2 O 7 has a lower thermal conductivity 12,13,[20][21][22][23][24][25] and relatively higher compressive strength. 12,[26][27][28][29][30][31] In terms of thermal conductivity, the value of 0.068 W/(m⋅K) (porosity: 94.40%) in this work is lower than the 0.090 W/(m⋅K) of porous YSZ f /Y 2 Si 2 O 7 (porosity: 92.9%), 12 0.077 W/(m⋅K) of YSZ f /(Y 0.8 Ho 0.2 ) 2 Si 2 O 7 (porosity: 93.2%), 13 97.5%). 20 As for the compressive strength, the 1.14 MPa of porous (Y 0.25 Ho 0.25 Yb 0.25 Lu 0.25 ) 2 Si 2 O 7 (porosity: 93.10%) is higher than the 0.99 MPa of porous YSZ f /Y 2 Si 2 O 7 (porosity: 93.5%), 12 0.80 MPa of hydroxyapatite (porosity: 92.0%), 26 and 0.44 MPa of ZrO 2 (porosity: 92.5%).…”

Section: Porosity Compressive Strength and Thermal Conductivitymentioning

confidence: 99%

Porous (Y_0.25Ho_0.25Yb_0.25Lu_0.25)₂Si₂O₇: A novel high‐entropy ceramic with high porosity and excellent thermal stability

Zhou,

Zeng,

et al. 2024

J Am Ceram Soc.

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With the rapid development of hypersonic vehicles, the thermal protection systems face great challenges due to the severe aerodynamic heat. As a result, conventional fiber insulation tiles would experience severe shrinkage at high temperatures (>1500°C), endangering the safety of the aircraft. To solve the problem, a high‐entropy effect was introduced to increase the high‐temperature resistance of thermal insulation materials, and highly porous (Y0.25Ho0.25Yb0.25Lu0.25)2Si2O7 was prepared by in situ reaction sintering process in this work. The fabricated porous samples present excellent overall properties, including superhigh porosity (95.09%–93.10%), lightweight (0.29–0.41 g/cm3), and very low thermal conductivity (0.066–0.085 W/(m·K)). More importantly, porous (Y0.25Ho0.25Yb0.25Lu0.25)2Si2O7 has outstanding high‐temperature dimensional stability. Although the porosity of the sample is higher than 90%, its linear shrinkage at 1550°C for 2 h is less than 1%. The results demonstrate that porous high‐entropy (Y0.25Ho0.25Yb0.25Lu0.25)2Si2O7 is a promising thermal insulation material in extreme high‐temperature environments.

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Section: Porosity Compressive Strength and Thermal Conductivitymentioning

confidence: 99%

Porous (Y_0.25Ho_0.25Yb_0.25Lu_0.25)₂Si₂O₇: A novel high‐entropy ceramic with high porosity and excellent thermal stability

Zhou,

Zeng,

et al. 2024

J Am Ceram Soc.

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“…Porous ceramics have been widely used in thermal insulators, gas/liquid filtration, and sound absorption fields because of their good mechanical strength, high porosity, large specific surface area, and low thermal conductivity. , In recent years, many preparation methods for porous ceramics have been developed such as pore-forming agents, , a polymeric sponge replica technique, − gelcasting, , freeze casting, , foam-gelcasting, , etc. Of these methods, foam-gelcasting is the most popular method for preparing insulation porous ceramics.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Thermal Insulation and Mechanical Strength of Fiberglass Porous Ceramics via Adjustment of the Structure of Pores

Chang

et al. 2023

ACS Appl. Eng. Mater.

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Fiberglass porous ceramics were prepared via a foam-gelcasting method. The relationship between the rheology of the slurries and the structure of the specimens was investigated. The results show that when the content of the dispersant was 0.25 wt %, the slurries exhibit excellent fluidity. The thixotropic behavior of the slurries was strongly influenced by the content of the foam stabilizer agent and solid content. Furthermore, as the fluidity of the foaming slurries increased, the size of the pores increased. At the same time, the thickness of the pore walls decreased gradually. In addition, promoting the uniform distribution of the pore size by improving the thixotropic behavior of the foaming slurries was beneficial. The optimal foaming slurry was composed of 65 wt % fiberglass, 0.25 wt % dispersant, and 0.1 wt % foam stabilizer agent. After calcination at 750 °C, fiberglass porous ceramics with 78.3% porosity, 2.2 MPa compressive strength, and 0.11 W m −1 K −1 thermal conductivity were obtained.

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“…However, inorganic thermal insulation materials, especially porous ceramics, showed high porosity, low thermal conductivity, good mechanical strength, excellent heat insulation properties, and high-temperature resistance, which have been widely used in industrial fields with extremely severe conditions. 5 To date, several techniques for preparing porous ceramics have been developed, such as organic foam impregnation 6 , freeze-drying 7 , sol-gel 8 , 3D printing, 9 and direct gel-foaming. 10 Among the above methods, the direct gel-foaming technology is regarded as the most popular technique for preparing porous ceramics owing to its high efficiency, low cost, strong controllability of product structures, and excellent thermal insulation performance of products 11 .…”

Section: Introductionmentioning

confidence: 99%

“…To date, several techniques for preparing porous ceramics have been developed, such as organic foam impregnation 6 , freeze‐drying 7 , sol‐gel 8 , 3D printing, 9 and direct gel‐foaming 10 . Among the above methods, the direct gel‐foaming technology is regarded as the most popular technique for preparing porous ceramics owing to its high efficiency, low cost, strong controllability of product structures, and excellent thermal insulation performance of products 11 .…”

Section: Introductionmentioning

confidence: 99%

Fabrication of high strength and thermal insulation porous ceramics via adjusting the fiberglass contents

Chang

et al. 2023

Int J Applied Ceramic Tech

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Fiberglass porous ceramics were successfully prepared via a foam‐gelcasting process with fiberglass and glass particles. The effects of fiber content on the rheology of foaming slurries and the structure and mechanical properties of as‐prepared porous ceramics were investigated. The results showed that as the ratio of fiberglass to glass particles increased, the thixotropy of slurries decreased, which affected the foamability of slurries. When the ratio of fiberglass to particle was 75:25, the slurries exhibited excellent flowability and outstanding foamability, which was beneficial to optimize the structure of pores and improve the properties of the porous ceramics. The porosity, compressive strength, and thermal conductivity of porous ceramics with a content of 75 wt.% fiberglass treated at 750°C were 78.3%, 2.15 MPa, and .11 W/(m·K) (room temperature), respectively. Therefore, the prepared porous ceramics with a ratio of fiberglass to particle 75:25 were regarded as an ideal candidate for thermal insulation materials.

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Preparation of porous YSZ ceramics by ball milling foaming-freeze drying process

Cited by 11 publications

References 14 publications

Porous (Y_0.25Ho_0.25Yb_0.25Lu_0.25)₂Si₂O₇: A novel high‐entropy ceramic with high porosity and excellent thermal stability

Porous (Y_0.25Ho_0.25Yb_0.25Lu_0.25)₂Si₂O₇: A novel high‐entropy ceramic with high porosity and excellent thermal stability

Enhanced Thermal Insulation and Mechanical Strength of Fiberglass Porous Ceramics via Adjustment of the Structure of Pores

Fabrication of high strength and thermal insulation porous ceramics via adjusting the fiberglass contents

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Preparation of porous YSZ ceramics by ball milling foaming-freeze drying process

Cited by 11 publications

References 14 publications

Porous (Y0.25Ho0.25Yb0.25Lu0.25)2Si2O7: A novel high‐entropy ceramic with high porosity and excellent thermal stability

Porous (Y0.25Ho0.25Yb0.25Lu0.25)2Si2O7: A novel high‐entropy ceramic with high porosity and excellent thermal stability

Enhanced Thermal Insulation and Mechanical Strength of Fiberglass Porous Ceramics via Adjustment of the Structure of Pores

Fabrication of high strength and thermal insulation porous ceramics via adjusting the fiberglass contents

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Porous (Y_0.25Ho_0.25Yb_0.25Lu_0.25)₂Si₂O₇: A novel high‐entropy ceramic with high porosity and excellent thermal stability

Porous (Y_0.25Ho_0.25Yb_0.25Lu_0.25)₂Si₂O₇: A novel high‐entropy ceramic with high porosity and excellent thermal stability