| Low Expansion Glass-Ceramics Using Industrial Waste
and Low-cost Aluminosilicate Minerals: Fabrication and
Characterizations |
Sitendu Mandal,a, b, * Raktima Chatterjee,a
Sourav Nag,a
Srikrishna Manna,a
Sunirmal Jana,a
Kaushik Biswasa
and Balram Ambadeb
Pages : 46-55
DOI : 10.1080/0371750X.2023.2173300 |
| Abstract |
| The recycling of the wastes towards value added product development has become a
prime challenge. In this work, a low thermal expansion glass-ceramic material based
on ternary LAS (Li2O-Al2O3
-SiO2
) system has been prepared by adopting meltquenching route using industrial waste (blast furnace slag) and low-cost
aluminosilicate minerals (China clay and pyrophyllite) at relatively low melting
temperature (~1450oC). A part of the precursor powder for pristine glass has also
been prepared by sol-gel processing utilizing Li2CO3
and Al(NO3
)3
.9H2O to obtain better
homogeneity in the glass composition vis-à-vis glass-ceramics at lower melting
temperature. Thermal properties of the material have been characterized to optimize
the nucleation and crystallization temperatures for converting glass to glass-ceramics.
Phase structure and surface morphology of the glass-ceramics have been analyzed
by X-ray diffraction (XRD) and field emission scanning electron microscopy. XRD
study reveals the presence of lithium aluminosilicate as a major phase at the
crystallization temperature of 730oC. The developed glass-ceramics show a low thermal
expansion coefficient (CTE) value of (19±0.5)?10–7/
oC in the temperature range of
30o
-500oC. The present work can unfold an avenue towards conversion of waste into
wealth in the form of low CTE glass-ceramics for possible application as cook-top
plate of LPG gas oven.
[Keywords: Low expansion glass-ceramics, Li2O-Al2O3
-SiO2
system, Blast furnace slag,
China clay, Pyrophyllite, Cook-top plate]
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