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
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
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
work_keys_str_mv	AT sghadami improvementofmechanicalpropertiesofhfb2basedcompositesbyincorporatinginsitusicreinforcementthroughpressurelesssintering AT etaherinassaj improvementofmechanicalpropertiesofhfb2basedcompositesbyincorporatinginsitusicreinforcementthroughpressurelesssintering AT hrbaharvandi improvementofmechanicalpropertiesofhfb2basedcompositesbyincorporatinginsitusicreinforcementthroughpressurelesssintering AT fghadami improvementofmechanicalpropertiesofhfb2basedcompositesbyincorporatinginsitusicreinforcementthroughpressurelesssintering
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Improvement of mechanical properties of HfB2-based composites by incorporating in situ SiC reinforcement through pressureless sintering

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