Porous SiC using polycarbosilane/camphene solutions: Roles of freeze casting parameters

Zou, Jianpeng; Xiong, Huiwen; Huang, Yujuan; Wang, Zhiguo; Wen, Jianhui; Du, Wei; Cao, Jun

doi:10.1016/j.ceramint.2021.06.160

Cited by 5 publications

(1 citation statement)

References 26 publications

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“…During the freezing process, a single-track vertical temperature gradient (Δ T ) is generated, guiding the ice crystals to grow preferentially from the bottom to the top as illustrated in Figure a . The mechanical motion modes of particles and fibers are mainly dependent on the critical velocity (ν c ) as expressed by eq : − ν normalc = normalΔ σ 0 a 0 3 η R where Δσ is the thermodynamic free energy of particles, a 0 is the average intermolecular distance in the liquid layer, η is the solution viscosity, and R is the particle radius. Once the freezing front velocity exceeds the critical velocity, particles will be entrapped.…”

Section: Results and Discussionmentioning

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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Section: Results and Discussionmentioning

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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Reconstructed Hierarchical Pore Structure of Porous SiC Ceramics Using Micro‐X‐Ray Computed Tomography

et al. 2023

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Porous ceramics prepared by freeze casting are strongly appealing for filtration, separation, heat insulation, energy storage, and bioengineering. Herein, a unidirectionally freeze‐casting process is effectively adopted to fabricate porous silicon carbide (SiC) ceramics. The freezing rates of 0.29, 1.59, and 22.80 °C min−1 are presented at the bottom, which are simulated by finite‐element analysis. The pore structure characterize is systematically investigated through the 3D‐reconstructed micro‐X‐Ray computed tomography. Porous SiC ceramics with reasonable densification present the layer‐stacked texture and the hierarchical interconnected porous structure. The pore sizes are in the range of 30–40 μm. With the decreasing of freezing temperatures, the pore sizes reduce, while the number of channels increases. After sublimation of the fine ice crystals, there are a large number of channels (5–10 μm). The open porosities decrease from 82.3% to 78.2%, and a maximum compressive strength of 1.97 MPa is obtained. The pore size distribution is bimodal at the top and bottom of porous ceramics. The surface of porous SiC ceramics with obviously lamellar structure is connected.

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Direct ink writing of hierarchical porous SiC ceramics as catalyst support for hydrogen production

Qian,

Liu,

Mei

et al. 2024

Ceramics International

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Porous SiC using polycarbosilane/camphene solutions: Roles of freeze casting parameters

Cited by 5 publications

References 26 publications

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

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

Reconstructed Hierarchical Pore Structure of Porous SiC Ceramics Using Micro‐X‐Ray Computed Tomography

Direct ink writing of hierarchical porous SiC ceramics as catalyst support for hydrogen production

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