Porous Silicon Carbide Ceramics Processing and Properties

Porous silicon carbide ceramics combine the intrinsic high thermal stability, chemical inertness and hardness of SiC with a controlled network of voids that impart low density, tunable permeability and enhanced thermal insulation. Processing routes span carbothermal reduction, liquid-phase sintering, chemical vapour infiltration and foaming or templating methods. Each approach seeks to engineer pore size, distribution and interconnectivity to achieve the desired balance between mechanical strength and functional permeability. Advances in powder grading, pore-forming additives and preceramic polymer infiltration have enabled hierarchical porosity across micro-, meso- and macroscales, improving gas-filtration efficiency, thermal shock resistance and catalytic support performance. Tailoring microstructure through sintering temperature, additive chemistry and template removal affords precise control over flexural strength and thermal conductivity, while emerging sustainable routes employ industrial wastes or biomorphic templates for cost-effective manufacture. These developments underscore the global significance of porous SiC ceramics for high-temperature filtration, energy conversion and thermal management applications.

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Porous Silicon Carbide Ceramics Processing and Properties publication trend

The graph below shows the total number of articles in porous silicon carbide ceramics processing and properties across all publications each year (not limited to Nature Index journals).

Technical terms

Porosity: The fraction of a material’s volume occupied by voids, influencing density, permeability and thermal insulation.

Sintering: A heat-treatment process that fuses powdered particles into a solid mass by atomic diffusion, controlling densification and neck growth.

Carbothermal reduction: A high-temperature reaction in which carbon reduces silica precursor to SiC, often followed by recrystallisation to form a porous network.

Chemical vapour infiltration (CVI): A method in which gaseous precursors penetrate a porous preform and decompose to deposit SiC on internal surfaces, reinforcing the skeleton.

Flexural strength: The stress at which a material fails in bending, indicative of resistance to deformation under load.

Permeability: The ability of a porous material to allow fluids to pass through its connected pore network, quantified by Darcy’s law.

References

1. A reverse particle grading strategy for design and fabrication of porous SiC ceramic supports with improved strength. Journal of Advanced Ceramics (2024).
2. Activated coke fly ash-aided SiC supports: Enhanced mechanical strength and durability for high-temperature gas filtration. Advanced Membranes (2025).
3. Fabrication of SiC Porous Ceramics by Foaming Method. Materials (2023).
4. Microstructure and mechanical properties of porous SiC ceramics by carbothermal reduction and subsequent recrystallization sintering. Journal of Asian Ceramic Societies (2020).
5. Microstructures and Properties of Porous Liquid-Phase-Sintered SiC Ceramic by Hot Press Sintering. Materials (2019).
6. Preparation of Biomorphic Porous SiC Ceramics from Bamboo by Combining Sol–Gel Impregnation and Carbothermal Reduction. Polymers (2019).
7. Fabrication of Macroporous Biomorphic SiC from Cellulose Nanofibers Aerogel. Materials (2018).
8. Monolithic supports based on biomorphic SiC for the catalytic combustion of hydrogen. RSC Advances (2016).