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Cold sintering of Metakaolin: A one-step densification process of amorphous aluminosilicate.

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Title:	Cold sintering of Metakaolin: A one-step densification process of amorphous aluminosilicate.
Authors:	Li, Linhao¹ (AUTHOR) 2022500022@buct.edu.cn, Yang, Fan² (AUTHOR), Liu, Cheng^3,4 (AUTHOR), Chen, Zhao¹ (AUTHOR), Ge, Jin⁵ (AUTHOR), Hou, Zhiling^1,6 (AUTHOR)
Source:	Ceramics International. Oct2025:Part B, Vol. 51 Issue 24, p43311-43318. 8p.
Subjects:	Sintering, Aluminum silicates, Industrial applications, Ceramics, Mechanical behavior of materials, Ionic conductivity
Abstract:	Aluminosilicates find wide and important applications in many modern industrial scenarios, but their densification process is highly energy-intensive. This study developed a one-step cold sintering process for metakaolin ceramics, a readily available amorphous aluminosilicate material. The optimized process can produce ceramics with a density of 90% relative to the true density at a significantly reduced sintering temperature of 240 °C (as compared to the typical sintering temperature of ∼1400 °C) under an applied pressure of 400 MPa. The original amorphous phase of the metakaolin was preserved after the sintering process. The resulting metakaolin ceramics exhibited adequate mechanical properties, with a hardness of 3.6 GPa and a Young's modulus of 58.1 GPa. They also demonstrated a high bulk ionic conductivity of 0.002 S/cm at 600 °C. These results show a wide range of potential applications for cold-sintered metakaolin ceramics in areas such as solid-state electrolytes and refractories. [ABSTRACT FROM AUTHOR]
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Database:	Engineering Source

Description
Abstract:	Aluminosilicates find wide and important applications in many modern industrial scenarios, but their densification process is highly energy-intensive. This study developed a one-step cold sintering process for metakaolin ceramics, a readily available amorphous aluminosilicate material. The optimized process can produce ceramics with a density of 90% relative to the true density at a significantly reduced sintering temperature of 240 °C (as compared to the typical sintering temperature of ∼1400 °C) under an applied pressure of 400 MPa. The original amorphous phase of the metakaolin was preserved after the sintering process. The resulting metakaolin ceramics exhibited adequate mechanical properties, with a hardness of 3.6 GPa and a Young's modulus of 58.1 GPa. They also demonstrated a high bulk ionic conductivity of 0.002 S/cm at 600 °C. These results show a wide range of potential applications for cold-sintered metakaolin ceramics in areas such as solid-state electrolytes and refractories. [ABSTRACT FROM AUTHOR]
ISSN:	02728842
DOI:	10.1016/j.ceramint.2025.07.070