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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2021
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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) |
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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 |
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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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1718382057217851392 |