scholarly journals On Modeling of Synthesis Process of Boron Carbide Based Nanocomposites

2021 ◽  
Vol 6 (1) ◽  
pp. 3
Author(s):  
Levan Chkhartishvili ◽  
Levan Antashvili ◽  
Lasha Dalakishvili ◽  
Roin Chedia ◽  
Otar Tsagareishvili ◽  
...  
Keyword(s):  
Boron Carbide ◽  
Synthesis Process ◽  
Wide Field ◽  
Optimal Route ◽  
First Order ◽  
Hard Materials ◽  
Reaction Constants ◽  
Boron Carbide B4c ◽  
Modern Technologies ◽  
Additional Phase

Nanocomposites based on boron carbide B4C are hard materials with wide field of applications in modern technologies. A system of first-order ordinary differential equations that simulates the process of chemical synthesis of nanopowders of B4C–TiB2 compositions containing titanium diboride (TiB2) as an additional phase is suggested and resolved numerically for a typical ratio of reaction constants. Reagents and products concentrations are found as time-functions. In this way, the optimal route of production technology of boron carbide-based nanomaterials can be identified.

Leaching Kinetics of Atrazine and Inorganic Chemicals in Tilled and Orchard Soils

2014 ◽  
Vol 28 (2) ◽  
pp. 231-237 ◽  
Author(s):  
Lech W. Szajdak ◽  
Jerzy Lipiec ◽  
Anna Siczek ◽  
Artur Nosalewicz ◽  
Urszula Majewska
Keyword(s):  
Reaction Rate ◽  
Inorganic Compounds ◽  
Model Performance ◽  
Order Reaction ◽  
First Order Reaction ◽  
Order Kinetic ◽  
Time Data ◽  
First Order ◽  
Concentration Changes ◽  
Reaction Constants

Abstract The aim of this study was to verify first-order kinetic reaction rate model performance in predicting of leaching of atrazine and inorganic compounds (K+1, Fe+3, Mg+2, Mn+2, NH4 +, NO3 - and PO4 -3) from tilled and orchard silty loam soils. This model provided an excellent fit to the experimental concentration changes of the compounds vs. time data during leaching. Calculated values of the first-order reaction rate constants for the changes of all chemicals were from 3.8 to 19.0 times higher in orchard than in tilled soil. Higher first-order reaction constants for orchard than tilled soil correspond with both higher total porosity and contribution of biological pores in the former. The first order reaction constants for the leaching of chemical compounds enables prediction of the actual compound concentration and the interactions between compound and soil as affected by management system. The study demonstrates the effectiveness of simultaneous chemical and physical analyses as a tool for the understanding of leaching in variously managed soils.

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

2015 ◽  
Vol 122 (2) ◽  
pp. 579-588 ◽  
Author(s):  
M. R. Forouzan ◽  
R. Taherzadeh Mousavian ◽  
T. Sharif ◽  
Y. A. Afkham
Keyword(s):  
Boron Carbide ◽  
Microwave Energy ◽  
Synthesis Process

scholarly journals In Situ Renewable Coating of Boron Carbide (B4C) for Plasma Materials for Plasma-Technological and Fusion Devices

2019 ◽  
Author(s):  
Leon Begrambekov ◽  
Andrey Grunin ◽  
Nikolay Puntakov ◽  
Yaroslav Sadovskiy ◽  
Vyacheslav Budaev ◽  
...  
Keyword(s):  
Boron Carbide ◽  
Boron Carbide B4c

The kinetics and the mechanism of oxidative decarboxylation of benzilic acid by acidic permanganate (stopped-flow technique) — An autocatalytic study

2004 ◽  
Vol 82 (9) ◽  
pp. 1372-1380 ◽  
Author(s):  
Sairabanu A Farokhi ◽  
Sharanappa T Nandibewoor
Keyword(s):  
Activation Parameters ◽  
Oxidative Decarboxylation ◽  
Two Stage ◽  
First Order ◽  
First Order Kinetics ◽  
Stage Process ◽  
Benzilic Acid ◽  
Reaction Constants ◽  
Kinetics Of ◽  
Good Agreement

The kinetics of the oxidation of benzilic acid by potassium permanganate in an acidic medium were studied spectrophotometrically. The reaction followed a two-stage process, wherein both stages of the reaction followed first-order kinetics with respect to permanganate ion and benzilic acid. The rate of the reaction increased with an increase in acid concentration. Autocatalysis was observed by one of the products, i.e., manganese(II). A composite mechanism involving autocatalysis has been proposed. The activation parameters of the reaction were calculated and discussed and the reaction constants involved in the mechanisms were calculated. There is a good agreement between the observed and calculated rate constants under different experimental conditions.Key words: oxidation, autocatalysis, benzilic acid, two-stage kinetics.

The Comparison between Boron Carbide (B4C) with other Common Inhibitors on Physical and Mechanical Properties of WC/Co

2012 ◽  
Vol 05 ◽  
pp. 102-110 ◽  
Author(s):  
H. Tamizifar ◽  
A.M. Hadian ◽  
M. Tamizifar
Keyword(s):  
Boron Carbide ◽  
Vanadium Carbide ◽  
Sintering Temperature ◽  
Physical And Mechanical Properties ◽  
Growth Inhibitor ◽  
Hard Metal ◽  
Growth Inhibitors ◽  
Fine Grained ◽  
Hard Metals ◽  
Boron Carbide B4c

The hardness, toughness and sum of cracks measurement of fine-grained WC - Co hard metals were studied. Thirty commercial and experimental hard metal grades with different additives such as boron carbide ( B 4 C ), vanadium carbide ( VC ), chromium carbide ( Cr 3 C 2) and silicon carbide ( SiC ) were prepared in a commercial sinter HIP furnace. Physical, mechanical and microstructure properties were investigated to build up a representative hardness/sum of cracks measurement band. This band was then used to estimate the most effective sintering temperature and the amount of each additives. Afterwards, influence of grain growth inhibitors in optimum condition were compared. The results showed that the grades, doped with B 4 C and VC as growth inhibitor exhibits more hardness than other comparable doped alloys. However, Cr 3 C 2 is favorable in toughness improvement.

The preparation of analysis samples of hard materials with a boron carbide mortar

The Analyst ◽  
1967 ◽  
Vol 92 (1093) ◽  
pp. 271 ◽  
Author(s):  
J. F. Boulton ◽  
R. P. Eardley
Keyword(s):  
Boron Carbide ◽  
Hard Materials
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