Manufacturing of nano mullite-silicon carbide filters by in situ reaction bonding

Najafi, Abolhassan; Khoeini, Mahdi; Jamshidi, A H

doi:10.1016/j.ceramint.2020.03.142

Cited by 7 publications

(1 citation statement)

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“…Porous SiC ceramics is suitable for application in gas sensors, hot gas, and molten metal filters due to its many advantageous properties, such as high strength and thermal conductivity, low thermal expansion coefficient, excellent thermal shock resistance, very good oxidation, and corrosion resistance. [18,19] In the previous published works, the porous SiC ceramics focus on using water-based slurries as pore morphology controllers. Although the porosities and compressive strengths are controlled through varying freezing conditions, the evolution and 3D reconstruction of pore structure seldom involve.…”

Section: Introductionmentioning

confidence: 99%

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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Section: Introductionmentioning

confidence: 99%