Journal
CERAMICS INTERNATIONAL
Volume 48, Issue 23, Pages 34234-34242Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2022.06.230
Keywords
B4C powders; Combustion synthesis; Molten salt method; Dielectric performance; Electromagnetic wave-absorbing performance
Categories
Funding
- National Natural Science Foundation of China [2022GY-421]
- Key R & D Project in Shaanxi Province [Z20200170]
- Shaanxi Provincial Education Department [2019JQ-897]
- department of Shaanxi Province
- Hualei Cheng of Faculty of Chemistry and Chemical Engineering, Engineering Research Center of Advanced Ferroelectric Functional Materials, Baoji University of Arts and Sciences
- Hualei Cheng of Faculty of Chemistry and Chemical Engineering
- Engineering Research Center of Advanced Ferroelectric Functional Materials
- Baoji University of Arts and Sciences 1 Hi -Tech Avenue, Baoji, Shaanxi, P R. China
- [52272027]
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This study successfully synthesized submicron-sized B4C powders with high specific surface areas using molten-salt-assisted combustion synthesis, and investigated their phase compositions, micro-structures, and electromagnetic wave absorbing properties. The sample with 6 wt% NaCl exhibited the smallest grain size and highest specific surface area.
Novel dielectric boron carbide (B4C) microwave absorbers have attracted extensive research interest. In this study, B2O3, polyvinyl chloride (PVC), Mg, and NaCl powders were used to prepare submicron-sized B4C powders with high specific surface areas via molten-salt-assisted combustion synthesis. The XRD, Raman, SEM-EDS, and BET were performed to characterize the effects of the NaCl content on the phase compositions and micro-structures of the different samples. The results indicated that the grain size of the B4C powders initially decreased and then increased with increasing NaCl content. Particularly, the P-6 sample (6 wt% NaCl) exhibited the smallest B4C grains (0.1 mu m) and highest specific surface area (9.06 g/cm2) among these samples. Finally, the electrical conductivities, dielectric performances, and electromagnetic wave (EMW)-absorbing performances of the samples were studied, and the dominant absorber loss mechanism was elucidated. With an optimal material thickness, the P-6 sample exhibited the minimum reflection loss (-42.42 dB) and the widest effective absorption bandwidth (3.4 GHz). Overall, these results verify that B4C powders with high specific surface areas and excellent EMW-absorbing properties can be easily synthesized.
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