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Optimization of interfaces in ceramics with SiC addition engineering for thermal cycling implications.

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Title: Optimization of interfaces in ceramics with SiC addition engineering for thermal cycling implications.
Authors: Makokha, John. W.1 (AUTHOR), Szenti, Imre1 (AUTHOR), Boldizsár, Tamás2 (AUTHOR), Bán, Zsolt2 (AUTHOR), Sebők‐Papp, Imre2 (AUTHOR), Nagy, László1,2 (AUTHOR), Kozma, Gábor1 (AUTHOR), Sápi, András1 (AUTHOR) sapia@chem.u-szeged.hu, Kukovecz, Ákos1 (AUTHOR), Kónya, Zoltán1,3 (AUTHOR)
Source: Journal of the American Ceramic Society. Jan2026, Vol. 109 Issue 1, p1-12. 12p.
Subjects: Silicon carbide, Solid-solid interfaces, Thermal conductivity, Thermocycling, Flexural strength, Ceramics, Fiber-reinforced ceramics, Thermal properties
Abstract: This study investigated how SiC PSD influences solid–solid interface to enhance thermal–mechanical properties of ceramic composites. Initial SiCmp particles were milled for 3 h at 200 rpm (microns) and 600 rpm (submicrons) to tune the PSD, and their impact was evaluated in cordierite–mullite matrix, sintered at 1360°C. XRD analysis confirmed 2θ peaks at 18° and 29.5° for cordierite, 35.65°, 41.35°, and 59.95° for SiC, and 26.2° and 33.1° for mullite. SEM–EDX analysis indicated a trace amount of SiO2 amorphous phase and consistent cordierite honeycomb–lamellar microstructure with coarse‐grained mullite. Macro SiC increased pore size and porosity attributed to their poor packing and air entrapment, whereas micron‐ and submicron‐sized SiC reduced porosity relative to pore size distribution. Flexural strength varied with SiC content and PSD. Although strength was reduced by increasing macro SiC, it was maintained up to ∼6 wt% by micron/submicron SiC. Thermal conductivity improved regardless of SiC size, with ∼6.0 wt% SiC microns (SiCµm)/submicron particles (SiCnp) yielding ∼34% enhancement. In subsequent thermal shock quenching cycles, composites containing ∼6 ± 0.42 wt% SiCµm retained ∼15% ± 1.79% higher residual flexural strength compared to mullite–cordierite, demonstrating improved thermal shock resistance. The enhancement is due to SiCµm reducing thermal barriers through improved solid–solid interface contact, minimizing thermal gradients and preserving structural integrity during high‐temperature cycling. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:This study investigated how SiC PSD influences solid–solid interface to enhance thermal–mechanical properties of ceramic composites. Initial SiCmp particles were milled for 3 h at 200 rpm (microns) and 600 rpm (submicrons) to tune the PSD, and their impact was evaluated in cordierite–mullite matrix, sintered at 1360°C. XRD analysis confirmed 2θ peaks at 18° and 29.5° for cordierite, 35.65°, 41.35°, and 59.95° for SiC, and 26.2° and 33.1° for mullite. SEM–EDX analysis indicated a trace amount of SiO2 amorphous phase and consistent cordierite honeycomb–lamellar microstructure with coarse‐grained mullite. Macro SiC increased pore size and porosity attributed to their poor packing and air entrapment, whereas micron‐ and submicron‐sized SiC reduced porosity relative to pore size distribution. Flexural strength varied with SiC content and PSD. Although strength was reduced by increasing macro SiC, it was maintained up to ∼6 wt% by micron/submicron SiC. Thermal conductivity improved regardless of SiC size, with ∼6.0 wt% SiC microns (SiCµm)/submicron particles (SiCnp) yielding ∼34% enhancement. In subsequent thermal shock quenching cycles, composites containing ∼6 ± 0.42 wt% SiCµm retained ∼15% ± 1.79% higher residual flexural strength compared to mullite–cordierite, demonstrating improved thermal shock resistance. The enhancement is due to SiCµm reducing thermal barriers through improved solid–solid interface contact, minimizing thermal gradients and preserving structural integrity during high‐temperature cycling. [ABSTRACT FROM AUTHOR]
ISSN:00027820
DOI:10.1111/jace.70283