Garai, Mrinmoy and Molla, Atiar R. and Reka, Arianit A. and Karmakar, Basudeb (2022) Wide thermal expansion in Ag-0/Au-0 nanoparticle doped SiO2-MgO-Al2O3-B2O3-K2O-MgF2 glass-ceramics. Materials Today-Proceedings, 50 (1, SI). pp. 134-138. ISSN 2214-7853

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This report demonstrates high temperature sealing tendency of alumino-silicate glasses (ASG) on the system SiO2-MgO-Al2O3-B2O3-K2O-MgF2 doped with silver (Ag) and gold (Au) nanoparticles. Density of the melt-quenched (1550 degrees C) glasses were in 2.51-2.55 The glasses were heat-treated at 900 +/- 10 degrees C over which the opaque glass-ceramics were obtained with major crystalline phase (XRD) fluorophlogopite mica KMg3(AlSi3O10)F-2] with secondary phase norbergite (Mg2SiO4 center dot MgF2). FESEM study indicated the development of Rod-like and rock-like crystallite particles (size similar to 1-4 mm) randomly dispersed in mother glass-ceramic which was restructured into nanocrystalline morphology (crystallite size similar to 100- 400 nm) with the aid of Ag-or Au-nanoparticles. The significant change in microstructure influenced the corresponding density (2.51-2.55 and thermal expansion characteristics. Coefficient of thermal expansion (CTE) for ASG was estimated to be 9.96 +/- 0.10 x 10(-6)/K (50-800 degrees C), which increased to 10.46-11.01 x 10(-6)/K when doped with Ag-or Au-content. Such wide CTE (11.01 +/- 0.11 x 10(-6)/K) value matches well with the CTE of ceramic/metallic materials used for high temperature application thus Ag-doped SiO2-MgO-Al2O3-B2O3-K2O-MgF2 glass can be a suitable for high temperature sealing application (like SOFC). (c) 2021 Elsevier Ltd. All rights reserved. Selection and peer-review under responsibility of the scientific committee of the International Virtual Conference on Advanced Nanomaterials and Applications.

Item Type: Article
Additional Information: International Virtual Conference on Advanced Nanomaterials and Applications (VCAN), ELECTR NETWORK, JUN 17-19, 2020
Subjects: Glass
Divisions: Glass
Depositing User: Bidhan Chaudhuri
Date Deposited: 30 Aug 2023 05:47
Last Modified: 30 Aug 2023 05:47

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