Replacement of fluorine in mould powders: influence on the crystallization kinetics

In the present work mould powders were prepared using different raw materials. One powder was fluorine-containing and the others were free-F. The total fluorine content (approx. 10 wt%) was replaced by different percentages of boron, sodium and lithium oxides. Fluorspar (CaF2), borax anhydrous (Na2B...

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Autores principales: Benavidez, Edgardo, Santini, Leandro, Brandaleze, Elena
Formato: Documento de conferencia publisherVersion
Lenguaje:Español
Publicado: Springer 2022
Materias:
mould fluxes
crystallization
kinetics
differential
thermal analysis
Acceso en línea:http://hdl.handle.net/20.500.12272/7390
Aporte de:
RIA - Repositorio Institucional Abierto (UTN) de Universidad Tecnológica Nacional
id I68-R174-20.500.12272-7390
record_format dspace
institution Universidad Tecnológica Nacional
institution_str I-68
repository_str R-174
collection RIA - Repositorio Institucional Abierto (UTN)
language Español
topic mould fluxes
crystallization
kinetics
differential
thermal analysis
spellingShingle mould fluxes
crystallization
kinetics
differential
thermal analysis
Benavidez, Edgardo
Santini, Leandro
Brandaleze, Elena
Replacement of fluorine in mould powders: influence on the crystallization kinetics
topic_facet mould fluxes
crystallization
kinetics
differential
thermal analysis
description In the present work mould powders were prepared using different raw materials. One powder was fluorine-containing and the others were free-F. The total fluorine content (approx. 10 wt%) was replaced by different percentages of boron, sodium and lithium oxides. Fluorspar (CaF2), borax anhydrous (Na2B4O7), and lithium carbonate (Li2CO3) were employed as source of fluorine, boron, and lithium, respectively. These powders were milling during 2 hours, then were melted at 1300°C and finally fast cooled onto a stainless steel plate. The amorphous solid layers as obtained were milling to produce glass powders which were tested by DTA at different heating rates: 5, 10, and 15°C/min. Several non-isothermal methods (Kissinger, Augis-Bennet, Ozawa, Cheng) were applied to study their kinetics of crystallization. From these models, different parameters associated to crystal growth, such as the activation energy (Ec), the frequency factor () and the nucleation rate (kc), were determined. Crystallographic phases and crystal size distribution were determined by X-ray diffraction and microscopic observation techniques.
format Documento de conferencia
publisherVersion
author Benavidez, Edgardo
Santini, Leandro
Brandaleze, Elena
author_facet Benavidez, Edgardo
Santini, Leandro
Brandaleze, Elena
author_sort Benavidez, Edgardo
title Replacement of fluorine in mould powders: influence on the crystallization kinetics
title_short Replacement of fluorine in mould powders: influence on the crystallization kinetics
title_full Replacement of fluorine in mould powders: influence on the crystallization kinetics
title_fullStr Replacement of fluorine in mould powders: influence on the crystallization kinetics
title_full_unstemmed Replacement of fluorine in mould powders: influence on the crystallization kinetics
title_sort replacement of fluorine in mould powders: influence on the crystallization kinetics
publisher Springer
publishDate 2022
url http://hdl.handle.net/20.500.12272/7390
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AT santinileandro replacementoffluorineinmouldpowdersinfluenceonthecrystallizationkinetics
AT brandalezeelena replacementoffluorineinmouldpowdersinfluenceonthecrystallizationkinetics
bdutipo_str Repositorios
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