Structure and properties of Al2O3-bonded porous fibrous YSZ ceramics fabricated by aqueous gel-casting

Yuan, Lei; Liu, Zhenli; Tian, Chen; Yan, Zhengguo; Yu, Jingkun; Hou, Xinghui; Zhu, Qiang

doi:10.1016/j.ceramint.2021.05.263

Cited by 16 publications

(10 citation statements)

References 31 publications

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“…The highest strengths were reached in the Ce-ZTA and Y-ZTA samples sintered at 1300 °C in ASY configuration with the values of 52.1 ± 2.5 and 46.1 ± 1.92 MPa, respectively, even though these samples had relatively high total porosity (42 ± 2% and 54 ± 1% for Ce-ZTA and Y-ZTA sample, respectively). Several works have reported that high porosity of the composites leads to a drastically reduced compression strength of Al 2 O 3 [ 1 , 9 , 12 , 14 , 47 , 48 ]. In contrast, in the present work, the fibrous Al 2 O 3 and ZTA composites with high porosity showed a relatively high strength, which was attributed to the abovementioned gradient microstructure developed during sintering.…”

Section: Resultsmentioning

confidence: 99%

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Preparation and Characterization of Fibrous Alumina and Zirconia Toughened Alumina Ceramics with Gradient Porosity

et al. 2022

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This paper investigated a synthesis process for highly porous Al2O3, Y-ZTA, and Ce-ZTA ceramic nanocomposites with gradient microstructure and improved mechanical properties. Ceramic nanofibres were synthesized as the starting material. The gradient microstructure was developed during spark plasma sintering using an asymmetric graphite arrangement that generated significant temperature differences (80–100 °C) between the opposite sides of the samples. Structural and mechanical properties of the fibrous ceramic composites were investigated. The effect of the temperature gradient on properties was also discussed. While the asymmetric configuration resulted in a gradient porosity, reference samples fabricated in standard graphite configuration were uniformly porous. The gradient structure and the ZrO2 addition led to improved hardness and compression strength of the sintered samples. However, the opposite sides of the samples exhibited considerable variations in both microstructure and in terms of properties. The upper part of the Ce-ZTA ceramic showed a highly porous structure with 18.2 GPa hardness, while the opposite side was highly densified with 23.0 GPa hardness. Compressive strength was 46.1 MPa and 52.1 MPa for Y-ZTA and Ce-ZTA sintered at 1300 °C, respectively, despite their high porosity. The research provided a promising approach to prepare highly porous ZTA composites with high strength for a wide range of applications.

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Section: Resultsmentioning

confidence: 99%

“…One of the promising methods for making porous ceramics is the application of ceramic fibres as raw material, which has been demonstrated in numerous papers [ 14 , 15 , 16 ]. Most of these articles reported the formation of a three-dimensional network of interconnected pores [ 4 , 17 ].…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Fibrous Alumina and Zirconia Toughened Alumina Ceramics with Gradient Porosity

et al. 2022

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“…While using Al 2 O 3 as the binder, porous fibrous ceramics possess a relatively high compressive strength (2.78–3.40 MPa) and the highest bulk density (0.69–1.17 g·cm –3 ) simultaneously, whereas the bulk density also significantly increases. Hence, compared to porous fibrous ceramics bonded with different binders, − the synthesized CLPFCs bonded with mullite-SiO 2 possess a unique integration of low bulk density (0.48 g·cm –3 ) and excellent compressive strength (4.54 MPa). Furthermore, high-temperature compressive strength tests of porous fibrous ceramics are still lacking in most of the previously published studies, whereas the high-temperature compressive strength of CLPFCs in this work is investigated and has been enhanced up to 3.45 MPa at 1300 °C as illustrated in Figure .…”

Section: Results and Discussionmentioning

confidence: 99%

“…On the other hand, the lamellas of the CLPFCs actually should be regarded as the binder with a specific structure that has significant influences on the microstructure and mechanical properties of the porous fibrous ceramic. Among diverse binders that have been utilized to fabricate porous fibrous ceramics, SiO 2 is one of the most common high-temperature binders and has been widely applied in porous fibrous ceramics. , The introduction of other binders like B 2 O 3 , and Al 2 O 3 ,, has been confirmed to be beneficial to reinforcing the porous fibrous ceramics. However, the low melting point of SiO 2 and B 2 O 3 tremendously limits their tolerance capacity and service life in the extremely high temperature environment.…”

Section: Introductionmentioning

confidence: 99%

Cuttlefish-Bone-Structure-like Lamellar Porous Fiber-Based Ceramics with Enhanced Mechanical Performances

Zhang

Guo

et al. 2023

ACS Appl. Mater. Interfaces

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Porous fiber-based ceramics have been widely applied in various fields because of their excellent thermal insulation property and high thermal stability property. However, designing porous fibrous ceramics with enhanced comprehensive performances, such as low density, low thermal conductivity, and high mechanical properties at both room temperature and high temperature, is still a challenge and the future development trend. Hence, based on the lightweight cuttlefish bone that possesses a “wall-septa” structure with excellent mechanical performance, we design and fabricate a novel porous fibrous ceramic with the unique fiber-based dual structure of lamellas by the directional freeze-casting method and systematically investigate the effects of lamellar components on the microstructure and mechanical performances of the product. For the desired cuttlefish-bone-structure-like lamellar porous fiber-based ceramics (CLPFCs), the porous framework formed by the overlapping of transversely arranged fibers helps to reduce the density and thermal conductivity of the product, and the longitudinally arranged lamellar structure replaces traditional binders and plays an important role in improving the mechanical properties in the direction parallel to the X–Z plane. Compared with traditional porous fibrous materials reported in the literature, the CLPFCs with an Al2O3/SiO2 molar ratio of 1:2 in the lamellar component exhibits prominent comprehensive performances, such as low density, excellent thermal insulation property, and outstanding mechanical performances at both room temperature and high temperature (3.46 MPa at 1300 °C), indicating that the CLPFCs are a promising candidate for applications in high-temperature thermal insulation systems.

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“…From the same slurry, APD-Ca shows a higher relative strength than that of FD-a and other reported freeze-cast alumina (Figure j and Table S1, Supporting Information). − Besides, the APD method produces bulk APD-Ca material with the similar density as FD-a (∼1.8 g cm –3 ) by decreasing the solid content of starting slurry (∼38 wt %), and it shows comparable mechanical performances to FD-a sample (Table and Figure S9). APD samples approximately follow the quadratic scaling relationships σ/σ s ∼ (ρ/ρ s ) 2.2 , corresponding with the open-cell structural failure through the bending fracture of cell walls .…”

mentioning

confidence: 99%

Ambient Pressure Drying of Freeze-Cast Ceramics from Aqueous Suspension

Gao,

Qin,

Wen

et al. 2023

Nano Lett.

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Freeze-casting has been wildly exploited to construct porous ceramics but usually requires costly and demanding freeze-drying (high vacuum, size limit, and supercooled chamber), which can be avoided by the ambient pressure drying (APD) technique. However, applying APD to freeze-cast ceramic based on an aqueous suspension is still challenging due to inert surface chemistry. Herein, a modified APD strategy is developed to improve the drying process of freeze-cast ceramics by exploiting the simultaneous ice etching, ionic cross-linking, and solvent exchange under mild conditions (−10–0 °C, ambient pressure). This versatile strategy is applicable to various ceramic species, metal ions, and freezing techniques. The incorporated metal ions not only enhance liquid-phase sintering, producing ceramics with higher density and mechanical properties than freeze-cast counterparts, but also render customizable coloration and antibacterial property. The cost-/time-efficient APD is promising for mass production and even successive production of large-size freeze-cast ceramics that exceed the size of commercial freeze-dryers.

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Structure and properties of Al2O3-bonded porous fibrous YSZ ceramics fabricated by aqueous gel-casting

Cited by 16 publications

References 31 publications

Preparation and Characterization of Fibrous Alumina and Zirconia Toughened Alumina Ceramics with Gradient Porosity

Preparation and Characterization of Fibrous Alumina and Zirconia Toughened Alumina Ceramics with Gradient Porosity

Cuttlefish-Bone-Structure-like Lamellar Porous Fiber-Based Ceramics with Enhanced Mechanical Performances

Ambient Pressure Drying of Freeze-Cast Ceramics from Aqueous Suspension

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