In Situ Synthesis of Composite Cordierite-Mullite Ceramics from Ghassoul, Kaolin and Andalusite: Impact of Sintering Temperature

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This study investigates the in-situ synthesis of cordierite–mullite ceramic using stevensite rich-ghassoul (39.6 wt.%), bio-kaolin (24.7 wt.%) and andalusite (35.7 wt.%) as starting materials. Uni-axially pressed mixtures at 96 MPa were subjected to sintering at 1250, 1300, 1350 and 1380°C o determines the optimal temperature for cordierite–mullite composite formation. The phase evolution, microstructure, porosity and thermal expansion of samples sintered 1250 to 1380° C for 2 h were investigated. The behavior and mechanical properties were evaluated using 3-point bending and indirect tensile tests. Results revealed the crystallization of cordierite and mullitization of andalusite at temperatures of 1190°C and 1300°C, respectively. Cordierite and andalusite were the predominant phases observed at 1250°C, with a gradual mullitization of andalusite as the temperature increased up to 1380°C. Rietveld quantitative phase analysis results indicate that, at a sintering temperature of 1380°C, cordierite and mullite constitute 57.4 wt% and 31.4 wt%, respectively. The sample sintered at 1380°C exhibited the optimal performance with the following properties: maximum bending and indirect tensile strengths of 31.9 ± 1.1 MPa and 26.6 ± 2.8 MPa, respectively, a flexural modulus of 34.9±2.5 GPa, a coefficient of thermal expansion of 3.6±0.4x10-6 and a porosity.

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December 2025

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