Modeling the formation of boron carbide particles in an aerosol flow reactor

AIChE Journal ◽  
1992 ◽  
Vol 38 (11) ◽  
pp. 1685-1692 ◽  
Author(s):  
Yun Xiong ◽  
Sotiris E. Pratsinis ◽  
Alan W. Weimer
Keyword(s):  
Boron Carbide ◽  
Flow Reactor ◽  
Aerosol Flow ◽  
Carbide Particles

Modeling of the Formation of Boron Carbide Particles in an Aerosol Flow Reactor

1992 ◽  
Vol 242 ◽  
Author(s):  
Yun Xiong ◽  
Sotiris E. Pratsinis ◽  
W. Weimer
Keyword(s):  
Boron Carbide ◽  
Surface Area ◽  
Boron Oxide ◽  
Flow Reactor ◽  
Distribution Model ◽  
Two Dimensional ◽  
Heating Rates ◽  
Aerosol Flow ◽  
Average Size ◽  
Carbide Particles

ABSTRACTThe formation of submicron crystals of boron carbide (B4C) by rapid carbothermal reduction of intimately mixed carbon-boron oxide precursor powders in an aerosol flow reactor at temperatures above the boiling point of boron oxide is investigated. The employed high heating rates (105 K/s) of the process force release of gaseous boron oxide and suboxides and rupture of the precursor particles resulting in formation of boron carbide molecular clusters that grow to macroscopic particles by coagulation. Consequently, the formation and growth of B4C particles is described by simultaneous interparticle collision and coalescence using a two-dimensional distribution model that traces the evolution of both size and shape characteristics of the particles through their volume and surface area. Here, in addition to the coagulation term, the governing population balance equation includes a coalescence contribution based on B4C sintering law. The predicted evolution of the two-dimensional particle size distribution leads to a direct characterization of morphology as well as the average size and polydispersity of the powders. Furthermore, model predictions of the volume and surface area of boron carbide particles can be directly compared with experimental data of B4C specific surface area and grain size.

Mechanical characterization of LM25 alloy matrix composite reinforced with boron carbide

2021 ◽  
pp. 002199832110055
Author(s):  
Zeeshan Ahmad ◽  
Sabah Khan
Keyword(s):  
Tensile Strength ◽  
Boron Carbide ◽  
Mechanical Characterization ◽  
Stir Casting ◽  
Surface Mapping ◽  
Alloy Matrix ◽  
Casting Technique ◽  
The Matrix ◽  
Carbide Particles

Alumnium alloy LM 25 based composites reinforced with boron carbide at different weight fractions of 4%, 8%, and 12% were fabricated by stir casting technique. The microstructures and morphology of the fabricated composites were studied by scanning electron microscopy and energy dispersive spectroscopy. Elemental mapping of all fabricated composites were done to demonstrate the elements present in the matrix and fabricated composites. The results of microstructural analyses reveal homogenous dispersion of reinforcement particles in the matrix with some little amount of clustering found in composites reinforced with 12% wt. of boron carbide. The mechanical characterization is done for both alloy LM 25 and all fabricated composites based on hardness and tensile strength. The hardness increased from 13.6% to 21.31% and tensile strength 6.4% to 22.8% as reinforcement percentage of boron carbide particles increased from 0% to 12% wt. A fractured surface mapping was also done for all composites.

High-Throughput Synthesis of Lignin Particles (∼30 nm to ∼2 μm) via Aerosol Flow Reactor: Size Fractionation and Utilization in Pickering Emulsions

2016 ◽  
Vol 8 (35) ◽  
pp. 23302-23310 ◽  
Author(s):  
Mariko Ago ◽  
Siqi Huan ◽  
Maryam Borghei ◽  
Janne Raula ◽  
Esko I. Kauppinen ◽  
...  
Keyword(s):  
High Throughput ◽  
Flow Reactor ◽  
Pickering Emulsions ◽  
Size Fractionation ◽  
Aerosol Flow

Aerosol Flow Reactor Method for the Synthesis of Multicomponent Drug Nano- and Microparticles

2007 ◽  
pp. 111-128
Author(s):  
Janne Raula ◽  
Hannele Eerikäinen ◽  
Anna Lähde ◽  
Esko I. Kauppinen
Keyword(s):  
Flow Reactor ◽  
Aerosol Flow

scholarly journals Получение карбида бора в низковольтной электрической дуге постоянного тока, инициированной в открытом воздушном пространстве

2018 ◽  
Vol 44 (14) ◽  
pp. 26 ◽  
Author(s):  
А.Я. Пак ◽  
Г.Я. Мамонтов
Keyword(s):  
Boron Carbide ◽  
Arc Discharge ◽  
Electron Microscopic Examination ◽  
X Ray Diffraction ◽  
Electron Microscopic ◽  
Vacuum Equipment ◽  
X Ray ◽  
Gas Atmosphere ◽  
Average Size ◽  
Carbide Particles

AbstractWe describe a method of obtaining ultrafine boron carbide (B_13C_2) powder using the effect of a dc electric arc on a mixture of initial reactants containing carbon and boron. A peculiarity of the proposed method is that it can be implemented using arc discharge operating in open air without any vacuum equipment and protective inert gas atmosphere. X-ray diffraction data showed that the synthesized product in the general case contained three crystalline phases: boron carbide (B_13C_2), graphite (C), and boron oxide (B_2O_3). Electron-microscopic examination showed that the average size of boron carbide particles ranged from ~50 nm to ~2 μm.

scholarly journals Ceramics based on reactively sintered boron carbide

2018 ◽  
pp. 9-15
Author(s):  
A. I. Ovsienko ◽  
V. I. Rumyantsev ◽  
S. S. Ordanian
Keyword(s):  
Boron Carbide ◽  
Structure Formation ◽  
Process Parameters ◽  
Molten Silicon ◽  
Reactive Sintering ◽  
Negative Effect ◽  
Sintered Boron ◽  
Carbide Particles

The investigating results are given on the process parameters' influence on the phase and structure formation in the course of the B4C based materials' reactive sintering under the Si molten presence. The interaction of the B4C particles and carbon with the molten silicon was regarded during the reactive sintering. The negative effect of the B4C particles' dissolution in the molten silicon within the reactive sintering was noticed. The methods to raise the boron carbide particles' content in the ceramics based on the reactively sintered boron carbide were discussed.Ill. 10. Ref. 24. Tab. 1.

Electroless nickel–phosphorus coating on boron carbide particles

2012 ◽  
Vol 76 ◽  
pp. 11-14 ◽  
Author(s):  
Ayfer Kilicarslan ◽  
Fatih Toptan ◽  
Isil Kerti
Keyword(s):  
Boron Carbide ◽  
Electroless Nickel ◽  
Carbide Particles
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