Sinthesis and Properties of Marble-Like Glass-Ceramics Using of Ash from Thermal Power Plants

Yancho Hristov Hristov* and Ganka Rumyanova Kolchakova
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Yancho Hristov Hristov*: Department of Material science and technology, Assen Zlatarov University – Bourgas, Bulgaria
Ganka Rumyanova Kolchakova: Department of Material Science and Technology, Assen Zlatarov University – Burgas, Bulgaria

Scientific Review, 2019, vol. 5, issue 10, 173-178

Abstract: Color marble-like glass-ceramic materials were obtained through thermal treatment of glasses of the system CaO-Al2O3-SiO2 by using natural materials with the introduction of waste materials - ash from thermal power plants (TPP). The melting of the glass batch was in corundum crucibles at 1450oC with an isothermal hold of 60 min. The glasses obtained was fritted in distilled water and dried for 6 hours at 100oC, then completely crushed and divided into fractions with grain size of 0.8 mm, 1.0 mm, 2 mm, 2.5 mm and over 2.5 mm. It was found that the use of ash from TPP lead to higher values of degree of transformation (crystallization) than using base composition. Values of Avramy parameter’s in the range n=1,0 ÷ 1,6 are showed that crystallization of the glass frit is largely heterogeneous and crystal growing starts from the surface. The introduction of ash from TPP to native glasses carry out to significant reduction of energy of crystallization by ??=289 kJ/mol to Ec=221 kJ/mol. The glass-ceramic materials were obtained through a one stage crystallization - 1050÷1070?? and an isothermal hold of 60 min., colored white, yellow brown to dark brown. The main crystalline phase in glass-ceramics is ?-vollastonite with needle habit, size of crystals - ? = 40 ÷ 120 ?m and d

Keywords: Glass-ceramic; Crystallization; Crystal growing; Marble-like effect. (search for similar items in EconPapers)
Date: 2019
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Persistent link: https://EconPapers.repec.org/RePEc:arp:srarsr:2019:p:173-178

DOI: 10.32861/sr.510.173.178

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