Surface Properties and Morphology of Boron Carbide Nanopowders Obtained by Lyophilization of Saccharide Precursors

Kozień, Dawid; Jeleń, Piotr; Stȩpień, Joanna; Olejniczak, Zbigniew; Sitarz, Maciej; Pędzich, Zbigniew

doi:10.3390/ma14123419

Cited by 7 publications

(6 citation statements)

References 25 publications

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“…are used as carbon sources for the synthesis of B 4 C, but the application of prepared B 4 C powder was inhibited owing to their single morphology and large particle size, which can be solved by using organic carbon source. [24][25][26] This is because the multiform pyrolysis carbon produced by the pyrolysis of organic compounds can improve the dielectric loss and interfacial effect of materials by changing the structure and morphology during the reaction process. Ahmed et al 27 synthesized boron carbide using boric acid and lactose as raw materials through a carbothermal synthesis route.…”

Section: Introductionmentioning

confidence: 99%

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

Deng,

Ding,

Xiao

et al. 2024

Int J Applied Ceramic Tech

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Boron carbide powders were synthesized by combustion synthesis using organics chitosan, dextrin, cellulose, starch, and polyvinyl chloride (PVC) as carbon sources. The microwave absorbing properties of boron carbide powders synthesized by different carbon sources were investigated. The results showed that the powders synthesized using organic compounds containing Cl and N atoms as carbon sources have better absorbing properties. The peak value of reflection loss of boron carbide powder prepared with chitosan as carbon source is −46.41 dB at 2.1 mm thickness, with an effective absorption range of 9.21–12.30 GHz and an effective absorption bandwidth of 3.09 GHz. The small and uniform boron carbide grains and residual carbon with multiple morphologies enhance the interface polarization and electronic polarization in the material, which leads to multiple reflections and losses of the microwave. Additionally, the lattice defects and surface holes caused by Cl, N, and other atoms in chitosan and PVC increase the energy storage sites of the material, which makes the materials obtain excellent microwave absorbing properties. Boron carbides fabricated from an organic carbon source provide a potential for the preparation of high‐temperature resistant absorber.

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Section: Introductionmentioning

confidence: 99%

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

Deng,

Ding,

Xiao

et al. 2024

Int J Applied Ceramic Tech

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“…Various machine parts, light mass armors for body and vehicle, protective coating of electronic surfaces, p-type semiconductors, thermocouples, diode and transistor devices, and control rods and shielding for nuclear reactors as well as materials for cancer therapy by neutron capturing have been manufactured using boron carbide and its composites [ 9 – 13 ]. Due to these various applications in our daily lives, various physicochemical properties have long been investigated [ 14 – 17 ] with ongoing detailed studies on B 4 C and its composite materials [ 18 – 25 ].…”

Section: Introductionmentioning

confidence: 99%

Optimum pyrolysis conditions to prepare the most crystalline boron carbide powder from boric acid–mannitol complex ester

PEKDEMİR,

ÖNAL,

SARIKAYA

2023

Turkish Journal of Chemistry

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A weak acidic complex ester (CE) in solid form was prepared by a condensation reaction between very weak boric acid (BA: H 3 BO 3 ) and (D)-mannitol (MA: C 6 H 14 O 6 ) by the molar ratio of BA/MA = 2. A boron carbide (B 4 C) precursor was obtained from heating of the CE at 400 °C for 4 h. The precursor was pyrolyzed under argon flow in the interval of 1300–1550 °C for 4 h and at 1400 °C for 1–4 h, respectively. The materials were examined using several techniques such as X-ray diffraction analysis, thermal analysis, scanning electron microscopy, particle size distribution, and nitrogen adsorption/desorption. The optimum pyrolysis temperature and duration were 1400 °C and 4 h, respectively. The most crystalline B 4 C particles were distributed between 1 and 100 μm with a mean particle size of 20 μm. The specific surface area and specific pore volume were 13.5 m 2 g −1 and 0.09 cm 3 g −1 , respectively. The size of the pores was between 2 and 36 nm with a mean size of 14 nm.

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“…Although boron carbide was discovered in the nineteenth century as a by-product of a reaction involving metal borides, methods for its preparation are still being improved. Self-propagating high-temperature synthesis (SHS) [ 8 , 9 , 10 ] has proven to be a versatile processing route to fabricate refractory ceramics, including but not limited to the B 4 C of diverse morphologies, which exhibit a unique combination of enhanced physicomechanical and tribological properties [ 11 , 12 , 13 , 14 , 15 ]. The short synthesis duration (minutes), the consumption of only the inner heat of reagents, the simplicity of the technological equipment, and the ability to produce high-purity products emphasize the viability of this technology.…”

Section: Introductionmentioning

confidence: 99%

Novel Pathway for the Combustion Synthesis and Consolidation of Boron Carbide

et al. 2022

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A novel pathway for the magnesiothermic reduction of boron oxide and magnesium dodecaboride (MgB12) in the presence of carbon by a self-propagating high-temperature synthesis method was proposed that was aimed at the direct preparation of boron carbide nanopowder. The combined utilization of two boron sources, boron oxide and MgB12, allowed tailoring the overall caloric effect of the process, increasing the yield of the target product and lessening the laborious leaching process. In addition, it is an alternative way to utilize magnesium borides, which are inevitable side products at boron production. Multivariate thermodynamic calculations performed in the B2O3-MgB12-Mg-C system allowed estimating equilibrium compositions of the products and deducing the optimum composition of the initial mixture for obtaining B4C. For the latter, the adiabatic temperature (Tad) is 2100 °C, which is theoretically enough for the implementation of the self-propagating reaction. The combustion reaction was shown to be extremely sensitive to the initial mixture composition, external pressure, as well as sample diameter (heat losses). It proceeds in self-oscillatory mode and leads to the product of a layered macrostructure. The combustion product was then consolidated by the spark plasma sintering technique at different conditions. Vickers microhardness was measured, and the wear erosion behavior was examined. The variation in lattice parameters of boron carbide reflected the influence of synthesis, sintering and erosion conditions on the ordering/disordering of the boron carbide structure.

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Surface Properties and Morphology of Boron Carbide Nanopowders Obtained by Lyophilization of Saccharide Precursors

Cited by 7 publications

References 25 publications

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

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

Optimum pyrolysis conditions to prepare the most crystalline boron carbide powder from boric acid–mannitol complex ester

Novel Pathway for the Combustion Synthesis and Consolidation of Boron Carbide

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