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SINTERED GLASS-CERAMICS, SELF-GLAZED MATERIALS AND FOAMS FROM METALLURGICAL SLAG
Abstract
The materials used for the synthesis are modified waste raw materials in the form of slags (up to 70 % wt.) with addition of quartz sand and calcium fluoride. The initial batch is being melted at 1400 oC and then quenched in water. The resulting glass frit is milled bellow 75 microns, pressed into “green” samples being exposed in a next stage to thermal scanning at different temperatures with different heating rates, holding temperatures and times. In the framework of present investigation is presented analysis of the possibilities to obtain new glass-ceramic materials by in-situ densification and foaming using customized optical Hot-Stage Microscopic (HSM) experimental setup. Additionally, analysis of the performed physical-chemical characterization of the obtained species presented here is carried out. These experiments with the new materials consist of measurements of the sintering curves, optical analysis of the volume shrinkage and volume expansion; Scanning Electron Microscopy (SEM); Energy Dispersion Spectroscopy (EDS); 3-D Computed Tomography (CT) and X-Ray Diffraction Spectroscopy (XRD). The highlighted method of production described here allows the in-situ synthesis of three types of new materials on demand by the corresponding industrial needs by using the same pressed glass powders. It is demonstrated a flexibility of the synthesis obtaining namely well densified glass-ceramics at temperatures of 900 oC or self-glazed glass-ceramics at 1000 oC or glass-ceramic foams at 1100 oC. The first set of materials is characterized by dense structure and good mechanical properties, the second one - by fine smooth “commercial” surface and the third one- by very low specific weight, 70-80 % closed porosity and good thermal stability above 1000 oC.
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References4
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Jordanov N. B., Hamzawy E. M. A., Tatchev D., Karamanov A., Sintered iron-rich glass-ceramics and foams obtained in air and argon in: Foams - emerging technologies, Intech Open, London, 2019, in press
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Strnad Z, Glass-ceramic materials: Liquid phase separation, nucleation and crystallization in Glass science and technology vol. 8, Elsevier, Amsterdam, Oxford, 1986.
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