Garai, Mrinmoy and Reka, Arianit A and Karmakar, Basudeb and Molla, Atiar Rahaman (2021) Microstructure-mechanical properties of Ag-0/Au-0 doped K-Mg-Al-Si-O-F glass-ceramics. RSC Advances, 11 (19). pp. 11415-11424. ISSN 2046-2069

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In understanding the catalytic efficacy of silver (Ag-0) and gold (Au-0) nanoparticles (NPs) on glass-ceramic (GC) crystallization, the microstructure-machinability correlation of a SiO2-MgO-Al2O3-B2O3-K2O-MgF2 system is studied. The thermal parameters viz., glass transition temperature (T-g) and crystallization temperature (T-c) were extensively changed by varying NPs (in situ or ex situ). Tc was found to be increased (T-c = 870-875 degrees C) by 90-110 degrees C when ex situ NPs were present in the glass system. Under controlled heat-treatment at 950 +/- 10 degrees C, the glasses were converted into glass-ceramics with the predominant presence of crystalline phase (XRD) fluorophlogopite mica, KMg3(AlSi3O10)F-2]. Along with the secondary phase enstatite (MgSiO3), the presence of Ag and Au particles (FCC system) were identified by XRD. A microstructure containing spherical crystallite precipitates (similar to 50-400 nm) has been observed through FESEM in in situ doped GCs. An ex situ Ag doped GC matrix composed of rock-like and plate-like crystallites mostly of size 1-3 mu m ensured its superior machinability. Vicker's and Knoop microhardness of in situ doped GCs were estimated within the range 4.45-4.61 GPa which is reduced to 4.21-4.34 GPa in the ex situ Ag system. Machinability of GCs was found to be in the order, ex situ Ag > ex situ Au similar to in situ Ag > in situ Au. Thus, the ex situ Ag/Au doped SiO2-MgO-Al2O3-B2O3-K2O-MgF2 GC has potential for use as a machinable glass-ceramic.

Item Type: Article
Subjects: Glass
Divisions: Glass
Depositing User: Bidhan Chaudhuri
Date Deposited: 14 Dec 2021 07:03
Last Modified: 14 Dec 2021 07:03

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