Preparation of carbon-free B4C powder from B2O3 oxide by carbothermal reduction process

Jung, Choong–Hwan; Lee, Man−Jong; Kim, Chan-Joong

doi:10.1016/s0167-577x(03)00579-2

Cited by 120 publications

(60 citation statements)

References 3 publications

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“…Most of the reported solid state processes [10,12,30] produce single phase boron carbide. The discussed experimentation process is initially a solid state process.…”

Section: Explanation To Observed Resultsmentioning

confidence: 99%

Evolution of Crystallographic Structures and Phases in Micropyretically Formed Boron Rich Boron Carbide – a New Material System

Mohanty¹,

Kandasubramanian²,

Seshadri³

2011

Advances in Ceramics - Characterization, Raw Materials, Processing, Properties, Degradation and Healing

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“…Most of the reported solid state processes [10,12,30] produce single phase boron carbide. The discussed experimentation process is initially a solid state process.…”

Section: Explanation To Observed Resultsmentioning

confidence: 99%

Evolution of Crystallographic Structures and Phases in Micropyretically Formed Boron Rich Boron Carbide – a New Material System

Mohanty¹,

Kandasubramanian²,

Seshadri³

2011

Advances in Ceramics - Characterization, Raw Materials, Processing, Properties, Degradation and Healing

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“…This may be attributed to the grain development derived from the solid-gas reactions or gas-gas reactions during the grain growth [30]. Hence the gas phase formation during the carbothermic reduction process was determined by thermodynamic calculation.…”

Section: Reaction Mechanismmentioning

confidence: 99%

Synthesis of Al4SiC4 powders via carbothermic reduction: Reaction and grain growth mechanisms

et al. 2017

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Abstract:Highly pure Al 4 SiC 4 powders were prepared by carbothermic reduction at 2173 K using Al 2 O 3 , SiO 2 , and graphite as raw materials. The obtained Al 4 SiC 4 powders owned hexagonal plate-like grains with a diameter of about 200-300 μm and a thickness of about 2-6 μm. Based on the experimental results, the reaction of Al 4 SiC 4 formation and grain evolution mechanisms were determined from thermodynamic and first-principles calculations. The results indicated that the synthesis of Al 4 SiC 4 by the carbothermic reduction consisted of two parts, i.e., solid-solid reactions initially followed by complex gas-solid and gas-gas reactions. The grain growth mechanism of Al 4 SiC 4 featured a two-dimensional nucleation and growth mechanism. The gas phases formed during the sintering process favored the preferential grain growth of (0010) and (1 10) planes resulting in formation of hexagonal plate-like Al 4 SiC 4 grains.

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“…Another important result was that the amount of existing gases from the microwave oven was considerable for sample S 1 . Generally, the complete reaction of the carbon is very difficult because the reaction byproduct such as carbon monoxide carries volatile boric species away from the reaction site, which breaks the stoichiometry [41,42]. It seems that milling of B 2 O 3 and Mg powders followed by mechanical activation process for 4 h could lead to the prevention of unwanted intermediate products formation during MACS.…”

Section: Samples Characterizationmentioning

confidence: 99%

A three-step synthesis process of submicron boron carbide powders using microwave energy

Forouzan

Mousavian

Sharif

et al. 2015

J Therm Anal Calorim

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In this study, a three-step synthesis process is proposed for the production of submicron B 4 C powders. The initial step is the mechanical activation of a Mg-C-B 2 O 3 mixture, which is carried out by using a high-energy planetary ball mill. The second phase is the microwaveassisted combustion synthesis, used to fabricate the MgO-B 4 C composite powders. The final stage is an acid leaching for removing the MgO phase. The results of DSC, XRD, and SEM analyses indicated that mechanical activation was a vital process for microwave synthesis and that no starting powders were remained unreacted after microwave heating. A considerable reduction in reaction temperature was obtained from DSC analysis after mechanical activation process. TG results indicated that separated milling of Mg with B 2 O 3 powders would avoid the formation of gases during exothermic reactions. Finally, it was found that submicron boron carbide powders with an average crystallite size about 114 nm were produced with a high purity after acid leaching.

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Preparation of carbon-free B4C powder from B2O3 oxide by carbothermal reduction process

Cited by 120 publications

References 3 publications

Evolution of Crystallographic Structures and Phases in Micropyretically Formed Boron Rich Boron Carbide – a New Material System

Evolution of Crystallographic Structures and Phases in Micropyretically Formed Boron Rich Boron Carbide – a New Material System

Synthesis of Al4SiC4 powders via carbothermic reduction: Reaction and grain growth mechanisms

A three-step synthesis process of submicron boron carbide powders using microwave energy

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