Aluminophosphosilicate Glasses as an Alternative Source for Microporous Materials of Technically Attractive Compositions and Morphological Characteristics

Abstract:

The glass-forming area in the system SiO₂-P₂O₅-Al₂O₃-MgO-Na₂O is determined utilizing reagent grade chemicals. The obtained glasses are characterized using FT-IR, DTA, DSC, TMA and SEM. The multicomponent, mixed network glasses exhibiting low coefficients of thermal expansion, fairly high softening temperatures (at Al₂O₃/P₂O₅ ˃1) and good chemical durability, are made of SiO₄, AlO₄ and PO₄ polymerized tetrahedral units. AlPO₄ groups incorporated in the network structure increase thermal stability and modify the crystallization behavior, rendering it a slow process requiring high temperatures and / or prolonged heating times. Ceramization is accomplished through a multistage process depending mainly on the AlPO₄ content which is determined by the Al₂O₃/P₂O₅ ratio. At Al₂O₃/P₂O₅≈1, AlPO₄-high cristobalitic form is the first to crystallize in bulk, followed by farringtonite Mg₃(PO₄)₂. At Al₂O₃/P₂O₅˃ 2, platy corundum is the main crystallizing phase. Microporous glass-ceramics are obtained via acid leaching of either some or all of the crystallized phases, or through dissolving of the glassy matrix and preserving a network of one or more of the crystalline phases. Selected phases of less chemical durability have been removed, to leave a network of the most chemically resistant phases AlPO₄ and amorphous silica. On the other hand, the amorphous silica matrix containing Na₂O, MgO and P₂O₅ has been leached out in glasses having fibrous corundum as the main crystallizing phase to produce a microporous material with a unique morphology, being made of what looks like a house of cards structure made up of deformed, randomly oriented corundum blades or sheets. Such morphology, is believed to provide a microporous material with an extremely high surface area.

• Periodical: Applied Mechanics and Materials (Volumes 799-800)
• Pages: 145-152
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.799-800.145
• Online since: October 2015
• Authors: Taufik Aboud*
• Keywords: Aluminophosphosilicate Glasses, Glass Ceramization, Microporous Materials

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