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High-temperature modification of black talc on the properties of cordierite-based porous ceramics
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DOI：10.1016/j.oceram.2026.101012.png)
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Abstract
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To improve the reactivity of black talc, high-temperature modification was applied to modify it, decomposing its layered structure into enstatite and amorphous SiO2 at 1100 °C, which reduces the required synthesis temperature and holding time for cordierite formation. Using 60 wt% of this modified black talc and sintering at 1300 °C for 60 min, the prepared cordierite-based porous ceramics achieved a compressive strength of 28.15 MPa, a bulk density of 2260 kg/m3, a water absorption of 12.49%, and a thermal conductivity of 2.11 W/(m·K). The modification enhances the reactivity of the raw material, promotes a uniform closed-pore structure, and reduces the sintering temperature and holding time. This optimal process enables low thermal expansion, high porosity, and high-value utilization of black talc.
Keywords:
Black talc
High-temperature modification
Cordierite-based porous ceramics
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