Glass of composition SiO2-Al2O3-CaO- CaF2 (SACF) was made by conventional melting and quenching process using either normal or nano-SiO2. The glasses were characterized by differential thermal analysis (TG/DTA), X-ray diffraction (XRD), scanning electron microscopy (SEM) and EDAX. The crystallization, microstructure, mechanical and chemical properties were compared for the two systems. It was observed that the nano silica containing glass ceramic have lower crystallization peak temperature (Tp), higher Vickers hardness and acid resistance than that of normal silica containing glass ceramics. © 2013 AIP Publishing LLC.

SUDIP DAS

Chemical Engineering

D P MUKHERJEE

J K SINHA

University of Calcutta (informally known as Calcutta University or CU) is a collegiate public state university located in Kolkata, West Bengal, India.&nbsp;Within India it is recognized as a &quot;Five-Star University&quot; and accredited &quot;A&quot; Grade by National Assessment and Accreditation Council.

&nbsp;

The University of Calcutta has secured the Fifth position among the Universities of India in the prestigious &quot;Indian University Ranking 2019&quot; list, released by the NIRF of the Ministry of Human Resource Development, Government of India.

&nbsp;

It was established on 24 January 1857, and was one of the first institutions in Asia to be established as a multidisciplinary and Western-style university. Its alumni and faculty include several heads of state, heads of government, social reformers, prominent artists, only academy award winner and Dirac medal winner in India, many Fellows of the Royal Society and five Nobel laureates as of 2019 which is highest in South Asia.

University Of Calcutta

Glass-ceramics system using normal and nano silica - preparation and characteristics

AIP Conference Proceedings

The influence of MgF2 on the various properties like crystalline behavior, microstructure phases, hardness etc. in the SiO2-Al2O3-MgO-K2O-B2O3 glass system has been investigated. Three batches of glass system were synthesized and characterized by differential scanning calorimetry (DSC), coefficient of thermal expansion (CTE), X-ray powder diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy and scanning electron microscopy (SEM) equipped with energy dispersion X-ray spectroscopy (EDS). DSC study reveals that with the increase in MgF2 content the glass transition temperature (Tg) and first crystallization peak temperature (TpI) decreased whilst the second crystallization peak temperature (TpII) slightly increased. The CTE of the glasses is found to be in the ranges 6.34-6.40 × 10- 6 K- 1 (50-400 °C). The activation energy (Ec) and frequency factor (υ) both increase with increasing MgF2 content. The three-dimensional crystal growth is observed. The mica crystals are identified as fluorophlogopite, the predominant crystal phase for all the three glass specimens heat treated at 1050°C. Vickers hardness values decrease with increasing amount of fluorine content and it gives better machinability. © 2015 Published by Elsevier B.V.

Journal of Non-Crystalline Solids

The influence of MgF2 content on the characteristic improvement of machinable glass ceramics

The effects of fluorine content on the nucleation and crystallization behavior of SiO 2-Al 2O 3-CaO glass ceramics system have been investigated. The crystalline phases were determined by X-ray diffraction (XRD). The crystallization kinetics was determined by differential thermal analysis (DTA). The microstructures were examined by using scanning electron microscope (SEM). Fourier transformed infrared spectra (FTIR) analysis was used to study the glass structure. The results showed that by increasing the fluorine content, both the crystallization peak temperature (T p) and activation energy (E) decreased. Wollastonite, anorthite and gehlenite are the main crystalline phases that exist in the glass ceramics system. The study shows that fluorine promoted initial crystallization of glass and can be used as an effective nucleating agent in the SiO 2-Al 2O 3-CaO system. © 2012 Elsevier Ltd and Techna Group S.r.l.

Ceramics International

SiO 2-Al 2O 3-CaO glass-ceramics: Effects of CaF 2 on crystallization, microstructure and properties

Journal of Solid Mechanics and Materials Engineering

Production of High-Strength Glass-Ceramics from Industrial Wastes Using Phase Equilibrium Diagram of CaO-Al2O2-SiO2 System

Langmuir

Smart Control of Monodisperse Stöber Silica Particles:  Effect of Reactant Addition Rate on Growth Process

Glass-ceramics system using normal and nano silica - Preparation and characteristics

Journal	AIP Conference Proceedings
Publisher	-
ISSN	0094-243X