Sitendu, Mandal and Raktima, Chatterjee and Sourav, Nag and Srikirishna, Manna and Jana, Sunirmal and Kaushik, Biswas and Balram, Ambade (2024) Synthesis and fabrication of ultra-lowexpansion glass-ceramic in ternary Li2O-Al2O3-SiO2system utilizing industrial waste. In: 97th DGG Glass Technology Conference, Aachen, Germany , May 2024, Aachen, Germany . (Submitted)

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Abstract

The rapid rise of industrial solid wastes creates a major concern for environmental pollution. Thus, recycling of the wastes towards value added product development has become a real challenge [1].In this work, a low thermal expansion glass-ceramic (GC) material based on ternary Li2O-Al2O3-SiO2 (LAS)system has been prepared using industrial waste (Blast furnace slag) and low-cost aluminosilicate minerals (China clay and pyrophyllite)whileTiO2has beenused as nucleating agentin the glass composition.The raw material after mixing is melted at relatively lower temperature (~1450oC) compared to pure LAS system by melt-quenching route. 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 [2].The cast glass is annealed followed by ceramization. Initially, the thermal properties of material have been characterized to optimize the nucleation and crystallization temperatures for converting glass to glass-ceramics. It has been observed that nucleation and crystallization schedule play a crucial role to achieve the desired properties in LAS system. The XRD study reveals the presence of lithium aluminosilicate (β-eucryptite-β-spodumene solid solution) as major crystalline phase along with a minor crystal phase, calcium aluminosilicate. The glass heat-treated at 730°C/8h shows ultra-low CTE value of 8×10-7/0C in low temperature range of 0-2000C whereas 19×10-7/0C (0-5000C). The increase in soaking time of crystallization to more than 8h results in an increase in CTE value from 19×10-7/0C to 26×10-7/0C and 29×10-7/0C at 10 and 12h respectively. Formation of β-spodumene crystal phase become predominant along with calcium aluminosilicate as heat-treatment time is increased beyond 8h; thus, resulting in higher thermal expansion coefficient of the material. The crystallite size for heat-treated sample also increased from 54 nm to 62 and 72 nm as soaking time is increased resulting in the formation of bigger size crystals. The present work demonstrates an effective approach towards efficient utilization of waste for the development of low CTE glass-ceramics for cook-top plate of LPG gas ovenand optical applications[3].

Item Type:	Conference or Workshop Item (Paper)
Subjects:	Glass Engineering Materials
Divisions:	Glass
Depositing User:	Ms Upasana Sahu
Date Deposited:	04 Mar 2024 10:11
Last Modified:	04 Mar 2024 10:11
URI:	http://cgcri.csircentral.net/id/eprint/5681

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