Microstructural, physico-mechanical, optical and photocatalytic characteristics of kaolin-based eucryptite glass ceramics

  • Lithium aluminosilicates glass ceramics were prepared from quarried kaolin and artificial lithium carbonate. Different techniques were used to characterize the starting batches, glasses and glass ceramics, these are: laser PSDs, XRD, XRF, DSC, SEM-EDAX, bulk density, CTE, microhardness, FTIR, UV-Vis spectrophotometer in addition to Factsage (8.3) thermodynamic modeling software. Results show that the Al/Si ratio and total impurities of kaolin-based batches influence the crystallization of non-cracked and directly bounded coated eucryptite with shielding rims of lithium metasilicates, nepheline, leucite and silicate glassy phase. Notably, the low-grade kaolin-based batch motivates the crystallization of mature lithium aluminosilicate glass ceramics microstructure which enhances the bulk density (2.41 g/cm3), apparent porosity (0.7%), water absorption (0.29%), microhardness (394 kg/mm2), thermal expansion coefficient (₋0.76×10-7°C-1) at (25-500°C) and UV-V reflectance up to 86%. The mature microstructure with shielded rimmed eucryptiteLithium aluminosilicates glass ceramics were prepared from quarried kaolin and artificial lithium carbonate. Different techniques were used to characterize the starting batches, glasses and glass ceramics, these are: laser PSDs, XRD, XRF, DSC, SEM-EDAX, bulk density, CTE, microhardness, FTIR, UV-Vis spectrophotometer in addition to Factsage (8.3) thermodynamic modeling software. Results show that the Al/Si ratio and total impurities of kaolin-based batches influence the crystallization of non-cracked and directly bounded coated eucryptite with shielding rims of lithium metasilicates, nepheline, leucite and silicate glassy phase. Notably, the low-grade kaolin-based batch motivates the crystallization of mature lithium aluminosilicate glass ceramics microstructure which enhances the bulk density (2.41 g/cm3), apparent porosity (0.7%), water absorption (0.29%), microhardness (394 kg/mm2), thermal expansion coefficient (₋0.76×10-7°C-1) at (25-500°C) and UV-V reflectance up to 86%. The mature microstructure with shielded rimmed eucryptite exhibits outstanding photocatalytic performance, achieving up to 92% removal of MB dye. Such lithium aluminosilicate glass ceramics could be promising in microelectronics and photocatalysis applications.show moreshow less

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Author:Ahmed Yahya, Sherif Allam, Ola N. Almasarawi, Salwa A.M. Abdel-Hameed, Bastian Raab, AbdelMonem Soltan, Esmat M.A. Hamzawy
DOI:https://doi.org/10.1016/j.clay.2025.108024
ISSN:0169-1317
Parent Title (English):Applied Clay Science
Publisher:Elsevier BV
Document Type:Article
Language:English
Date of first Publication:2025/10/24
Reviewed:Begutachtet/Reviewed
Release Date:2025/11/04
Tag:Kaolin impuritiesLASMicrostructurePhotocatalysisThermal expansion
Volume:279
Article Number:108024
institutes:Fakultät Werkstofftechnik
Research Themes:Materialien & Produktionstechnik
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