Molten-salt-assisted combustion synthesis of B4C powders with high specific area and their electromagnetic wave absorbing performance

Microstructure and microwave‐absorbing properties of B4C/C composite powders produced by combustion synthesis with an AC foaming agent

“…In the previous work, our research group focused on improving the microwave‐absorbing properties of B 4 C via morphological changes to enhance polarization and successfully prepared nanoscale B 4 C powders uniformly with different carbon resources containing carbon black (CB), polyvinyl chloride (PVC), and borate citrate (BC), matching B 2 O 3 and Mg as the raw materials by the combustion synthesis (CS) strategy, a facile and novel approach to obtain products in one step. By contrast, we found the organic carbon resources caused more capricious structures 14,15 …”

“…(A) The yield, morphology, effective absorb bandwidth (EAB) and (B) the electrical conductivity comparison of B 4 C/C composite powders by combustion synthesis with different carbon resources 1,14 …”

“…By contrast, we found the organic carbon resources caused more capricious structures. 14,15 In this study, B 4 C/C composite powders were prepared by CS with polyvinyl alcohol (PVA) as a carbon resource, B 2 O 3 as a boron resource, and Mg as a reductant. The introduction of an azodicarbonamide (AC) foaming agent is expected to form a larger specific surface area of the free carbon with uniform distribution to improve the microwave-absorbing properties of products.…”

Combustion synthesized boron carbide powders by different organic carbon sources and microwave absorbing properties

“…It can be concluded that the presence of Cl and N atoms leads to the occurrence of gases such as HCl and NO 2 during the combustion synthesis reaction at the atomic scale, resulting in more small nuclei and uniform size of the product particles. 32 After EDS analysis on a complete grain, it further confirmed that all the grains in the product were boron carbide grains (Figure 3F). In addition to uniform boron carbide grains, there are also small amounts of residual carbon with multiple morphologies in C-1 and C-5 (Figure 4A-F).…”

“…The fast and low energy consumption combustion synthesis method can be used to produce B 4 C powder with small particle size. [30][31][32][33] In this work, B 4 C powders were prepared by combustion synthesis with chitosan, dextrin, cellulose, starch, and PVC as the carbon source, boron oxide as the boron source, and magnesium metal as the reducing agent. The phase, morphology, and composition of products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and Raman.…”