One step reduction of Boric Acid to boron carbide nanoparticles

Singh, Paviter; Singh, Bikramjeet; Kumar, Manjeet; Kumar, Akshay

doi:10.1016/j.ceramint.2014.06.101

Cited by 47 publications

(19 citation statements)

References 13 publications

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“…In ref. 42 , a stoichiometric B 4 C crystal powder was obtained after holding at 800 °C according to the reaction described in equation 1 . However, a long holding time (20 hours) was required.…”

Section: Discussionmentioning

confidence: 99%

Enhancement of oxidation resistance via a self-healing boron carbide coating on diamond particles

Sun

Meng

Qian

et al. 2016

Sci Rep

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A boron carbide coating was applied to diamond particles by heating the particles in a powder mixture consisting of H3BO3, B and Mg. The composition, bond state and coverage fraction of the boron carbide coating on the diamond particles were investigated. The boron carbide coating prefers to grow on the diamond (100) surface than on the diamond (111) surface. A stoichiometric B4C coating completely covered the diamond particle after maintaining the raw mixture at 1200 °C for 2 h. The contribution of the boron carbide coating to the oxidation resistance enhancement of the diamond particles was investigated. During annealing of the coated diamond in air, the priory formed B2O3, which exhibits a self-healing property, as an oxygen barrier layer, which protected the diamond from oxidation. The formation temperature of B2O3 is dependent on the amorphous boron carbide content. The coating on the diamond provided effective protection of the diamond against oxidation by heating in air at 1000 °C for 1 h. Furthermore, the presence of the boron carbide coating also contributed to the maintenance of the static compressive strength during the annealing of diamond in air.

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Section: Discussionmentioning

confidence: 99%

Enhancement of oxidation resistance via a self-healing boron carbide coating on diamond particles

Sun

Meng

Qian

et al. 2016

Sci Rep

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“…Though B 4 C has been successfully synthesized by CTR in many researches, however, its corresponding reaction mechanism is still controversial. The reaction mechanism of B 4 C synthesis was simply mentioned without elaboration in several researches.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic investigation and reaction mechanism of B₄C synthesis based on carbothermal reduction

Lei

Gao

et al. 2019

Int J Applied Ceramic Tech

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The reaction mechanism of B4C synthesis as yet remains unclear due to the lack of sufficient thermodynamic investigation, which limits the large‐scale controllable production of B4C ceramic material. In this paper, thermodynamic investigation of B4C synthesized by carbothermal reduction was calculated at atmospheric pressure over a wide temperature range (1500‐2500 K) coupled with the effects of pressure on B4C synthesis. Besides, predominance diagrams for B–C–O system at different temperatures and pressures were further established. Upon thermodynamic results, reaction mechanism was proposed and then verified by the synthesis experiment of B4C at desired temperatures. The thermodynamic investigation indicates that B4C may be synthesized by the reactions of C with liquid B2O3 (LS mechanism) or gaseous B2O2 (VS mechanism). At low temperature (~1823 K), B4C is polyhedral shape via LS mechanism, while two‐dimensional flake‐like B4C is synthesized by VS mechanism at high temperature (2123 K~). The obtained two types of B4C verify the accuracy of thermodynamic results. This study is instructive for the optimization of temperature, pressure for large‐scale controllable production of B4C ceramic material.

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“…Heating a mixture of boric acid and carbon in an electric arc furnace at a temperature close to the melting point of B 4 C. [21][22][23][24][25][26][27] However, as the reaction progresses, there are large temperature differences in different areas of the electric arc furnace. The reaction is not complete at low temperatures (473-273 K) away from the central area, which results in the presence of large amounts of free carbon.…”

Section: Introductionmentioning

confidence: 99%

Optimization of the decarbonizing ratio of boron carbide powders by reverse flotation using response surface methodology

Bai

Sun

et al. 2020

Int J Applied Ceramic Tech

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Free carbon is the main impurity in boron carbide and has many side effects on the quality of boron carbide. In this study, reverse flotation was used for the first time to remove free carbon in boron carbide. The response surface methodology was utilized to optimize the reverse flotation factors, and the samples were analyzed by X-ray diffraction, scanning electron microscope, laser particle size analyzer, and chemical analysis. The study results reveal that the main factors affecting the decarbonization ratio were slurry concentration, collector dosage, foaming agent dosage and pH value. Furthermore, the results also show that reverse flotation could be applied effectively to the removal of free carbon in boron carbide. Slurry concentration of 25.14%, collector dosage of 567.9 g/t, foaming agent dosage of 199.32 g/t and pH value of 8.4 were found to be the best conditions. Under the optimal conditions, the decarbonization ratio is 84.23%. Mass ratio of free carbon in boron carbide reduced from 2.98 to 0.47.

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One step reduction of Boric Acid to boron carbide nanoparticles

Cited by 47 publications

References 13 publications

Enhancement of oxidation resistance via a self-healing boron carbide coating on diamond particles

Enhancement of oxidation resistance via a self-healing boron carbide coating on diamond particles

Thermodynamic investigation and reaction mechanism of B₄C synthesis based on carbothermal reduction

Optimization of the decarbonizing ratio of boron carbide powders by reverse flotation using response surface methodology

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One step reduction of Boric Acid to boron carbide nanoparticles

Cited by 47 publications

References 13 publications

Enhancement of oxidation resistance via a self-healing boron carbide coating on diamond particles

Enhancement of oxidation resistance via a self-healing boron carbide coating on diamond particles

Thermodynamic investigation and reaction mechanism of B4C synthesis based on carbothermal reduction

Optimization of the decarbonizing ratio of boron carbide powders by reverse flotation using response surface methodology

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Product

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Thermodynamic investigation and reaction mechanism of B₄C synthesis based on carbothermal reduction