Seed assisted in-situ synthesis of porous anorthite/mullite whisker ceramics by foam-freeze casting

Wu, Linghao; Li, Cuiwei; Chen, Yufeng; Wang, Chang‐An

doi:10.1016/j.ceramint.2020.12.244

Cited by 31 publications

(20 citation statements)

References 47 publications

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“…In the process, environment friendly gelation is selected as gel system. 26,31 Through this method, porous Y 2 SiO 5 ceramics with ultrahigh porosity of 92.2%-95.8% and isotropous multiple pore structures have been prepared, and the shrinkages during demolding and drying processes were low to 0.8%-1.9%. 26 By this technique, porous anorthite/ mullite whisker ceramics have been fabricated, and the prepared material has high apparent porosity of 87.7-90.2% and high compressive strength of 0.65-3.31 MPa.…”

Section: Methods Of Characterizationmentioning

confidence: 99%

“…26 By this technique, porous anorthite/ mullite whisker ceramics have been fabricated, and the prepared material has high apparent porosity of 87.7-90.2% and high compressive strength of 0.65-3.31 MPa. 31 In this technique, the foam stability could be further improved through adding propyl gallate (PG) as a surface modifier. Porous mullite-based ceramics have been prepared using α-Al 2 O 3 and SiO 2 as raw materials, the prepared materials show both high porosity and high strength.…”

Section: Methods Of Characterizationmentioning

confidence: 99%

“…Recently, some researchers combined foam gel‐casting and freeze‐drying to fabricate porous ceramics. In the process, environment friendly gelation is selected as gel system 26,31 . Through this method, porous Y 2 SiO 5 ceramics with ultrahigh porosity of 92.2%–95.8% and isotropous multiple pore structures have been prepared, and the shrinkages during demolding and drying processes were low to 0.8%–1.9% 26 .…”

Section: Introductionmentioning

confidence: 99%

“…Through this method, porous Y 2 SiO 5 ceramics with ultrahigh porosity of 92.2%–95.8% and isotropous multiple pore structures have been prepared, and the shrinkages during demolding and drying processes were low to 0.8%–1.9% 26 . By this technique, porous anorthite/mullite whisker ceramics have been fabricated, and the prepared material has high apparent porosity of 87.7–90.2% and high compressive strength of 0.65–3.31 MPa 31 . In this technique, the foam stability could be further improved through adding propyl gallate (PG) as a surface modifier.…”

Section: Introductionmentioning

confidence: 99%

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Near net shape fabrication of porous cordierite by combination of foam gel‐casting and freeze‐drying

Lǐ

et al. 2021

Int J Applied Ceramic Tech

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It is well known that ceramic products are hard-tomachine due to their high strength and high hardness. Although the post-processing and fine processing of ceramics are technically feasible, the process is expensive and time consuming. In addition, cracks will inevitably be introduced during machining, resulting in properties reduction and ceramic products damage. 1 Therefore, it is particularly important to ensure the size and accuracy of ceramic product during preparation. Especially for porous ceramics, the shrinkage during preparation is even more difficult to avoid. [2][3][4] Therefore, the development of low-shrinkage porous ceramic preparation technology has attracted extensive attention. [5][6][7] Recently, porous cordierite ceramics with high porosity have been prepared and the sintering linear shrinkage was controlled below 2% through an in situ synthesis foam gel-casting method in our previous studies. 8,9 The near net size sintering was achieved by means of the compensation for sintering shrinkage through the volume expansion derived from phase transition and synthesis reaction. But the whole near net shape fabrication has not been achieved due to the large drying shrinkage before sintering. Large uneven drying shrinkage usually brings internal stress and microcracks, 10 which will not only cause difficulties

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Section: Methods Of Characterizationmentioning

confidence: 99%

Section: Methods Of Characterizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Near net shape fabrication of porous cordierite by combination of foam gel‐casting and freeze‐drying

Lǐ

et al. 2021

Int J Applied Ceramic Tech

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“…23 Therefore, when ceramics are prepared, introducing active materials such as seeds into the raw materials is one of the common methods for lowtemperature sintering. Wu et al 24 investigated the in situ synthesis of porous anorthite/mullite whisker ceramics assisted by mullite seeds. Mullite whiskers overlapped to form a stable three-dimensional network structure similar to a bird's nest.…”

Section: Introductionmentioning

confidence: 99%

Sintering behavior and morphology control of porous Al ₂ O ₃ ‐SiO ₂ ceramics for radome applications

Ren

Zhang

Shao

et al. 2022

Int J Applied Ceramic Tech

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Ceramics from porous Si 3 N 4 and its derivatives SiAlON and Si 2 N 2 O were once considered the most promising high-temperature wave-transmitting materials. However, their large-scale application in the field of radomes is greatly restricted due to their poor oxidation resistance, high preparation costs, and expensive raw materials. Therefore, the development of low-cost porous oxide ceramics remains of significant interest to the field of high-temperature wave transmission. Surprisingly, mullite ceramics, which are representative of the Al 2 O 3 -SiO 2 -system of ceramics, are ultra-low-cost materials with the potential to replace ceramics from Si 3 N 4 and its derivatives. In this paper, integrated porous Al 2 O 3 -SiO 2 -system ceramics were successfully prepared for load-bearing/wavetransmitting applications, using inexpensive calcined kaolin and alumina powder as the main raw materials. Calcined kaolin can provide seeds for the growth and development of mullite crystals in the ceramic system. High-strength and high-porosity ceramics were obtained with the mullite morphology controlled through the molar ratio of Al 2 O 3 to SiO 2 and the resulting content of mullite seeds. With increasing of mullite seed content, the length and radial width of mullite whiskers with "interlocking structure" gradually change from rodshaped "long and thick" to needle-like "short and thin." The prepared porous Al 2 O 3 -SiO 2 ceramics have high flexural strength, fracture toughness, and good dielectric properties.

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Preparation of alumina-rich calcium aluminate refractories with improved sintering densification and properties

et al. 2023

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Seed assisted in-situ synthesis of porous anorthite/mullite whisker ceramics by foam-freeze casting

Cited by 31 publications

References 47 publications

Near net shape fabrication of porous cordierite by combination of foam gel‐casting and freeze‐drying

Near net shape fabrication of porous cordierite by combination of foam gel‐casting and freeze‐drying

Sintering behavior and morphology control of porous Al ₂ O ₃ ‐SiO ₂ ceramics for radome applications

Preparation of alumina-rich calcium aluminate refractories with improved sintering densification and properties

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Seed assisted in-situ synthesis of porous anorthite/mullite whisker ceramics by foam-freeze casting

Cited by 31 publications

References 47 publications

Near net shape fabrication of porous cordierite by combination of foam gel‐casting and freeze‐drying

Near net shape fabrication of porous cordierite by combination of foam gel‐casting and freeze‐drying

Sintering behavior and morphology control of porous Al 2 O 3 ‐SiO 2 ceramics for radome applications

Preparation of alumina-rich calcium aluminate refractories with improved sintering densification and properties

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Product

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Sintering behavior and morphology control of porous Al ₂ O ₃ ‐SiO ₂ ceramics for radome applications