Properties of SiC Ceramics Sintered via Liquid Phase Using Al2O3 + Y2O3, Al2O3 + Yb2O3 and Al2O3 + Dy2O3 as Additives: a Comparative Study
Silicon carbide (SiC) ceramics show excellent performance at high temperatures. Due to the high covalence of Si-C bonds, these ceramics are produced successfully only via liquid phase sintering (LPS). In this work, SiC ceramics were sintered via LPS using eutectic mixtures of Al2O3+Y2O3, which served as a standard for comparison, Al2O3+Yb2O3 and Al2O3+Dy2O3. The oxides mixtures were used to form liquid phase during the SiC sintering. Mixtures of SiC and additives were ground, pressed at 300 MPa and sintered at 1950ºC for 2 hours. All mixtures showed similar hardness, fracture toughness and flexural strength slightly different. Also the microstructure and crystalline phase were similar, showing that the ytterbium's and dysprosium's oxides can be also used as additive as well the most used oxide, yttrium oxide.
Main Authors: | , , |
---|---|
Format: | Digital revista |
Language: | English |
Published: |
ABM, ABC, ABPol
2015
|
Online Access: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392015000300525 |
Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
id |
oai:scielo:S1516-14392015000300525 |
---|---|
record_format |
ojs |
spelling |
oai:scielo:S1516-143920150003005252015-08-04Properties of SiC Ceramics Sintered via Liquid Phase Using Al2O3 + Y2O3, Al2O3 + Yb2O3 and Al2O3 + Dy2O3 as Additives: a Comparative StudyRibeiro,SebastiãoRibeiro,Giseli CristinaOliveira,Marcela Rego de silicon carbide liquid phase sintering rare earths oxide mechanical properties Silicon carbide (SiC) ceramics show excellent performance at high temperatures. Due to the high covalence of Si-C bonds, these ceramics are produced successfully only via liquid phase sintering (LPS). In this work, SiC ceramics were sintered via LPS using eutectic mixtures of Al2O3+Y2O3, which served as a standard for comparison, Al2O3+Yb2O3 and Al2O3+Dy2O3. The oxides mixtures were used to form liquid phase during the SiC sintering. Mixtures of SiC and additives were ground, pressed at 300 MPa and sintered at 1950ºC for 2 hours. All mixtures showed similar hardness, fracture toughness and flexural strength slightly different. Also the microstructure and crystalline phase were similar, showing that the ytterbium's and dysprosium's oxides can be also used as additive as well the most used oxide, yttrium oxide.info:eu-repo/semantics/openAccessABM, ABC, ABPolMaterials Research v.18 n.3 20152015-06-01info:eu-repo/semantics/articletext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392015000300525en10.1590/1516-1439.311314 |
institution |
SCIELO |
collection |
OJS |
country |
Brasil |
countrycode |
BR |
component |
Revista |
access |
En linea |
databasecode |
rev-scielo-br |
tag |
revista |
region |
America del Sur |
libraryname |
SciELO |
language |
English |
format |
Digital |
author |
Ribeiro,Sebastião Ribeiro,Giseli Cristina Oliveira,Marcela Rego de |
spellingShingle |
Ribeiro,Sebastião Ribeiro,Giseli Cristina Oliveira,Marcela Rego de Properties of SiC Ceramics Sintered via Liquid Phase Using Al2O3 + Y2O3, Al2O3 + Yb2O3 and Al2O3 + Dy2O3 as Additives: a Comparative Study |
author_facet |
Ribeiro,Sebastião Ribeiro,Giseli Cristina Oliveira,Marcela Rego de |
author_sort |
Ribeiro,Sebastião |
title |
Properties of SiC Ceramics Sintered via Liquid Phase Using Al2O3 + Y2O3, Al2O3 + Yb2O3 and Al2O3 + Dy2O3 as Additives: a Comparative Study |
title_short |
Properties of SiC Ceramics Sintered via Liquid Phase Using Al2O3 + Y2O3, Al2O3 + Yb2O3 and Al2O3 + Dy2O3 as Additives: a Comparative Study |
title_full |
Properties of SiC Ceramics Sintered via Liquid Phase Using Al2O3 + Y2O3, Al2O3 + Yb2O3 and Al2O3 + Dy2O3 as Additives: a Comparative Study |
title_fullStr |
Properties of SiC Ceramics Sintered via Liquid Phase Using Al2O3 + Y2O3, Al2O3 + Yb2O3 and Al2O3 + Dy2O3 as Additives: a Comparative Study |
title_full_unstemmed |
Properties of SiC Ceramics Sintered via Liquid Phase Using Al2O3 + Y2O3, Al2O3 + Yb2O3 and Al2O3 + Dy2O3 as Additives: a Comparative Study |
title_sort |
properties of sic ceramics sintered via liquid phase using al2o3 + y2o3, al2o3 + yb2o3 and al2o3 + dy2o3 as additives: a comparative study |
description |
Silicon carbide (SiC) ceramics show excellent performance at high temperatures. Due to the high covalence of Si-C bonds, these ceramics are produced successfully only via liquid phase sintering (LPS). In this work, SiC ceramics were sintered via LPS using eutectic mixtures of Al2O3+Y2O3, which served as a standard for comparison, Al2O3+Yb2O3 and Al2O3+Dy2O3. The oxides mixtures were used to form liquid phase during the SiC sintering. Mixtures of SiC and additives were ground, pressed at 300 MPa and sintered at 1950ºC for 2 hours. All mixtures showed similar hardness, fracture toughness and flexural strength slightly different. Also the microstructure and crystalline phase were similar, showing that the ytterbium's and dysprosium's oxides can be also used as additive as well the most used oxide, yttrium oxide. |
publisher |
ABM, ABC, ABPol |
publishDate |
2015 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392015000300525 |
work_keys_str_mv |
AT ribeirosebastiao propertiesofsicceramicssinteredvialiquidphaseusingal2o3y2o3al2o3yb2o3andal2o3dy2o3asadditivesacomparativestudy AT ribeirogiselicristina propertiesofsicceramicssinteredvialiquidphaseusingal2o3y2o3al2o3yb2o3andal2o3dy2o3asadditivesacomparativestudy AT oliveiramarcelaregode propertiesofsicceramicssinteredvialiquidphaseusingal2o3y2o3al2o3yb2o3andal2o3dy2o3asadditivesacomparativestudy |
_version_ |
1756420565016510464 |