One-step synthetic route and sintering for carbon-coated B4C nanoparticles

Boron carbide is an extremely hard material extensively used in the industry. In this study, carbon-coated B4C nanoparticles were synthesized through a one-step synthesis method using high-temperature firing cheap and readily available raw materials, namely, boric acid and sucrose. X-ray diffraction...

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Bibliographic Details
Published in:Journal of alloys and compounds 2019-04, Vol.782, p.263-269
Main Authors: Ma, Mengdong, Li, Penghui, Li, Baozhong, Wu, Yingju, Gao, Yufei, Hu, Wentao, Gao, Guoying, Zhao, Zhisheng, Yu, Dongli, He, Julong
Format: Article
Language:English
Subjects:
B4C
Boron carbide
Carbon
Ceramics
Core-shell particles
Core-shell structure
Fracture toughness
High temperature
Nanoparticle
Nanoparticles
Particle size
Preparation method
Raman spectra
Raw materials
Spectrum analysis
Sucrose
Superhard
Synthesis
X-ray diffraction
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Summary:Boron carbide is an extremely hard material extensively used in the industry. In this study, carbon-coated B4C nanoparticles were synthesized through a one-step synthesis method using high-temperature firing cheap and readily available raw materials, namely, boric acid and sucrose. X-ray diffraction and Raman spectra analysis indicated the formation of B4C, and high-resolution transmission electron spectroscopy revealed that the carbon-coated B4C nanoparticles exhibited regular B4C-C core-hell structure with an average particle diameter of around 100 nm. This method is simple and time-saving, and can be adopted for the large-scale production of the core-shell nanoparticle. Directly using these core-shell structural nanoparticles as precursor, high-performance B4C/C ceramics with hardness reaching 34 GPa, fracture toughness reaching 3.3 MPa m1/2 were synthesized. This study has important implications in developing high-performance B4C ceramics. •A new method to prepare B4C-C core-hell nanopowders is proposed.•Grain growth of the nanopowders will not occur with the increase of temperature.•We synthesized high-performance B4C/C ceramics by using these nanopowders.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2018.12.104