Macrosegregation of Impurities in a Metallurgical Silicon Ingot After Transient Directional Solidification
Autor(a) principal: | |
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Data de Publicação: | 2017 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Materials research (São Carlos. Online) |
Texto Completo: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392017000401129 |
Resumo: | Metallurgical grade silicon was melted and directionally solidified in transient conditions by extracting heat from the base of a cylindrical ingot and inserting heat at the ingot top. A heat-transfer mathematical model was implemented to predict the solidification velocity and temperature gradient using cooling curves measured directly in the silicon melt. Nearly 70% of the resulting ingot displays a region of columnar grains aligned with the ingot axis. In this region, the concentration of metallic impurities is usually below the quantification limit of the analytical technique and intermetallic particles are absent, strongly indicating significant purification. The transition from the purified region of the ingot to the ingot top, where impurity concentrations increase and intermetallic particles are seen, is consistent with a change of the solid-liquid interface morphology from planar to cellular/dendritic, as similarly reported in the literature and as indicated by a preliminary analysis with the constitutional undercooling criterion. |
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Materials research (São Carlos. Online) |
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Macrosegregation of Impurities in a Metallurgical Silicon Ingot After Transient Directional Solidificationmacrosegregationmetallurgical silicondirectional solidificationsilicon refiningMetallurgical grade silicon was melted and directionally solidified in transient conditions by extracting heat from the base of a cylindrical ingot and inserting heat at the ingot top. A heat-transfer mathematical model was implemented to predict the solidification velocity and temperature gradient using cooling curves measured directly in the silicon melt. Nearly 70% of the resulting ingot displays a region of columnar grains aligned with the ingot axis. In this region, the concentration of metallic impurities is usually below the quantification limit of the analytical technique and intermetallic particles are absent, strongly indicating significant purification. The transition from the purified region of the ingot to the ingot top, where impurity concentrations increase and intermetallic particles are seen, is consistent with a change of the solid-liquid interface morphology from planar to cellular/dendritic, as similarly reported in the literature and as indicated by a preliminary analysis with the constitutional undercooling criterion.ABM, ABC, ABPol2017-08-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392017000401129Materials Research v.20 n.4 2017reponame:Materials research (São Carlos. Online)instname:Universidade Federal de São Carlos (UFSCAR)instacron:ABM ABC ABPOL10.1590/1980-5373-mr-2017-0008info:eu-repo/semantics/openAccessLima,Moyses LeiteMartorano,Marcelo AquinoFerreira Neto,João Batistaeng2017-09-05T00:00:00Zoai:scielo:S1516-14392017000401129Revistahttp://www.scielo.br/mrPUBhttps://old.scielo.br/oai/scielo-oai.phpdedz@power.ufscar.br1980-53731516-1439opendoar:2017-09-05T00:00Materials research (São Carlos. Online) - Universidade Federal de São Carlos (UFSCAR)false |
dc.title.none.fl_str_mv |
Macrosegregation of Impurities in a Metallurgical Silicon Ingot After Transient Directional Solidification |
title |
Macrosegregation of Impurities in a Metallurgical Silicon Ingot After Transient Directional Solidification |
spellingShingle |
Macrosegregation of Impurities in a Metallurgical Silicon Ingot After Transient Directional Solidification Lima,Moyses Leite macrosegregation metallurgical silicon directional solidification silicon refining |
title_short |
Macrosegregation of Impurities in a Metallurgical Silicon Ingot After Transient Directional Solidification |
title_full |
Macrosegregation of Impurities in a Metallurgical Silicon Ingot After Transient Directional Solidification |
title_fullStr |
Macrosegregation of Impurities in a Metallurgical Silicon Ingot After Transient Directional Solidification |
title_full_unstemmed |
Macrosegregation of Impurities in a Metallurgical Silicon Ingot After Transient Directional Solidification |
title_sort |
Macrosegregation of Impurities in a Metallurgical Silicon Ingot After Transient Directional Solidification |
author |
Lima,Moyses Leite |
author_facet |
Lima,Moyses Leite Martorano,Marcelo Aquino Ferreira Neto,João Batista |
author_role |
author |
author2 |
Martorano,Marcelo Aquino Ferreira Neto,João Batista |
author2_role |
author author |
dc.contributor.author.fl_str_mv |
Lima,Moyses Leite Martorano,Marcelo Aquino Ferreira Neto,João Batista |
dc.subject.por.fl_str_mv |
macrosegregation metallurgical silicon directional solidification silicon refining |
topic |
macrosegregation metallurgical silicon directional solidification silicon refining |
description |
Metallurgical grade silicon was melted and directionally solidified in transient conditions by extracting heat from the base of a cylindrical ingot and inserting heat at the ingot top. A heat-transfer mathematical model was implemented to predict the solidification velocity and temperature gradient using cooling curves measured directly in the silicon melt. Nearly 70% of the resulting ingot displays a region of columnar grains aligned with the ingot axis. In this region, the concentration of metallic impurities is usually below the quantification limit of the analytical technique and intermetallic particles are absent, strongly indicating significant purification. The transition from the purified region of the ingot to the ingot top, where impurity concentrations increase and intermetallic particles are seen, is consistent with a change of the solid-liquid interface morphology from planar to cellular/dendritic, as similarly reported in the literature and as indicated by a preliminary analysis with the constitutional undercooling criterion. |
publishDate |
2017 |
dc.date.none.fl_str_mv |
2017-08-01 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392017000401129 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392017000401129 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
10.1590/1980-5373-mr-2017-0008 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
text/html |
dc.publisher.none.fl_str_mv |
ABM, ABC, ABPol |
publisher.none.fl_str_mv |
ABM, ABC, ABPol |
dc.source.none.fl_str_mv |
Materials Research v.20 n.4 2017 reponame:Materials research (São Carlos. Online) instname:Universidade Federal de São Carlos (UFSCAR) instacron:ABM ABC ABPOL |
instname_str |
Universidade Federal de São Carlos (UFSCAR) |
instacron_str |
ABM ABC ABPOL |
institution |
ABM ABC ABPOL |
reponame_str |
Materials research (São Carlos. Online) |
collection |
Materials research (São Carlos. Online) |
repository.name.fl_str_mv |
Materials research (São Carlos. Online) - Universidade Federal de São Carlos (UFSCAR) |
repository.mail.fl_str_mv |
dedz@power.ufscar.br |
_version_ |
1754212671077482496 |