Analysis of DTA and dilatometric data used to study the behaviour of a mould flux

In the present work a casting powder containing ≈ 36 wt% SiO2, ≈ 31 wt% CaO, 13 wt% Na2O, and 10 wt% CaF2, was used as starting material. A mass of 10 g of the mould powder was placed in a graphite crucible and melted at 1300°C. After 15 minutes at this temperature, the melt was poured onto a stainl...

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Autores principales: Benavidez, Edgardo, Santini, Leandro, Brandaleze, Elena
Formato: Documento de conferencia publisherVersion
Lenguaje:Español
Publicado: 2022
Materias:
mould fluxes
crystallization
dilatometry
differential
thermal
analysis
Acceso en línea:http://hdl.handle.net/20.500.12272/7389
Aporte de:
RIA - Repositorio Institucional Abierto (UTN) de Universidad Tecnológica Nacional
id I68-R174-20.500.12272-7389
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
dilatometry
differential
thermal
analysis
spellingShingle mould fluxes
crystallization
dilatometry
differential
thermal
analysis
Benavidez, Edgardo
Santini, Leandro
Brandaleze, Elena
Analysis of DTA and dilatometric data used to study the behaviour of a mould flux
topic_facet mould fluxes
crystallization
dilatometry
differential
thermal
analysis
description In the present work a casting powder containing ≈ 36 wt% SiO2, ≈ 31 wt% CaO, 13 wt% Na2O, and 10 wt% CaF2, was used as starting material. A mass of 10 g of the mould powder was placed in a graphite crucible and melted at 1300°C. After 15 minutes at this temperature, the melt was poured onto a stainless steel inclined plate. By this method, solid glass layers were produced, which were sectioned into bars 10-15 mm in length to be used in dilatometric tests. Some of these bars were ground to powder to perform DTA runs. Both tests (DTA and dilatometry) were carried out at different heating rates: 5, 10 and 15 ºC/min, in air atmosphere, up to 900°C. Data of glass transition temperature (Tg), and crystallization peak temperature (Tc) were obtained from DTA and dilatometric runs. From these data, several non-isothermal methods based on Kissinger, Augis-Bennet, Ozawa, and Cheng models, were used to study the crystallization kinetics. Based on these models, the activation energy of crystallization (E), the frequency factor () and the crystallization rate constant (k) were calculated. A subsequent study was followed to determine the Avrami exponent and the crystallized fraction. The crystallographic phases were determined by XRD and the microstructure of samples, treated between 400-900 ºC, was observed by optical and electronic microscopy.
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 Analysis of DTA and dilatometric data used to study the behaviour of a mould flux
title_short Analysis of DTA and dilatometric data used to study the behaviour of a mould flux
title_full Analysis of DTA and dilatometric data used to study the behaviour of a mould flux
title_fullStr Analysis of DTA and dilatometric data used to study the behaviour of a mould flux
title_full_unstemmed Analysis of DTA and dilatometric data used to study the behaviour of a mould flux
title_sort analysis of dta and dilatometric data used to study the behaviour of a mould flux
publishDate 2022
url http://hdl.handle.net/20.500.12272/7389
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