Improvement of mechanical properties of HfB2-based composites by incorporating in situ SiC reinforcement through pressureless sintering

Abstract HfB2, Si, and activated carbon powders were selected to fabricate 0–30 vol% SiC reinforced HfB2-based composite. Pressureless sintering process was performed at 2050 °C for 4 h under a vacuum atmosphere. Microstructural studies revealed that in situ SiC reinforcement was formed and distribu...

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Autores principales: S. Ghadami, E. Taheri-Nassaj, H. R. Baharvandi, F. Ghadami
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Publicado: Nature Portfolio 2021
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Acceso en línea:https://doaj.org/article/ed8475d9fdb04cc4999460b93fa5cc14
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spelling oai:doaj.org-article:ed8475d9fdb04cc4999460b93fa5cc142021-12-02T17:01:43ZImprovement of mechanical properties of HfB2-based composites by incorporating in situ SiC reinforcement through pressureless sintering10.1038/s41598-021-88566-02045-2322https://doaj.org/article/ed8475d9fdb04cc4999460b93fa5cc142021-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-88566-0https://doaj.org/toc/2045-2322Abstract HfB2, Si, and activated carbon powders were selected to fabricate 0–30 vol% SiC reinforced HfB2-based composite. Pressureless sintering process was performed at 2050 °C for 4 h under a vacuum atmosphere. Microstructural studies revealed that in situ SiC reinforcement was formed and distributed in the composite according to the following reaction: Si + C = SiC. A maximum relative density of 98% was measured for the 20 vol% SiC containing HfB2 composite. Mechanical investigations showed that the hardness and the fracture toughness of these composites were increased and reached up to 21.2 GPa for HfB2-30 vol% SiC and 4.9 MPa.m1/2 for HfB2-20 vol% SiC, respectively. Results showed that alpha-SiC reinforcements were created jagged, irregular, and elongated in shape which were in situ formed between HfB2 grains and filled the porosities. Formation of alpha-SiC contributed to improving the relative density and mechanical properties of the composite samples. By increasing SiC content, an enhanced trend of thermal conductivity was observed as well as a reduced trend for electrical conductivity.S. GhadamiE. Taheri-NassajH. R. BaharvandiF. GhadamiNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-11 (2021)
institution DOAJ
collection DOAJ
language EN
topic Medicine
R
Science
Q
spellingShingle Medicine
R
Science
Q
S. Ghadami
E. Taheri-Nassaj
H. R. Baharvandi
F. Ghadami
Improvement of mechanical properties of HfB2-based composites by incorporating in situ SiC reinforcement through pressureless sintering
description Abstract HfB2, Si, and activated carbon powders were selected to fabricate 0–30 vol% SiC reinforced HfB2-based composite. Pressureless sintering process was performed at 2050 °C for 4 h under a vacuum atmosphere. Microstructural studies revealed that in situ SiC reinforcement was formed and distributed in the composite according to the following reaction: Si + C = SiC. A maximum relative density of 98% was measured for the 20 vol% SiC containing HfB2 composite. Mechanical investigations showed that the hardness and the fracture toughness of these composites were increased and reached up to 21.2 GPa for HfB2-30 vol% SiC and 4.9 MPa.m1/2 for HfB2-20 vol% SiC, respectively. Results showed that alpha-SiC reinforcements were created jagged, irregular, and elongated in shape which were in situ formed between HfB2 grains and filled the porosities. Formation of alpha-SiC contributed to improving the relative density and mechanical properties of the composite samples. By increasing SiC content, an enhanced trend of thermal conductivity was observed as well as a reduced trend for electrical conductivity.
format article
author S. Ghadami
E. Taheri-Nassaj
H. R. Baharvandi
F. Ghadami
author_facet S. Ghadami
E. Taheri-Nassaj
H. R. Baharvandi
F. Ghadami
author_sort S. Ghadami
title Improvement of mechanical properties of HfB2-based composites by incorporating in situ SiC reinforcement through pressureless sintering
title_short Improvement of mechanical properties of HfB2-based composites by incorporating in situ SiC reinforcement through pressureless sintering
title_full Improvement of mechanical properties of HfB2-based composites by incorporating in situ SiC reinforcement through pressureless sintering
title_fullStr Improvement of mechanical properties of HfB2-based composites by incorporating in situ SiC reinforcement through pressureless sintering
title_full_unstemmed Improvement of mechanical properties of HfB2-based composites by incorporating in situ SiC reinforcement through pressureless sintering
title_sort improvement of mechanical properties of hfb2-based composites by incorporating in situ sic reinforcement through pressureless sintering
publisher Nature Portfolio
publishDate 2021
url https://doaj.org/article/ed8475d9fdb04cc4999460b93fa5cc14
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AT etaherinassaj improvementofmechanicalpropertiesofhfb2basedcompositesbyincorporatinginsitusicreinforcementthroughpressurelesssintering
AT hrbaharvandi improvementofmechanicalpropertiesofhfb2basedcompositesbyincorporatinginsitusicreinforcementthroughpressurelesssintering
AT fghadami improvementofmechanicalpropertiesofhfb2basedcompositesbyincorporatinginsitusicreinforcementthroughpressurelesssintering
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