Institute of Combustion Problems

Almaty, Kazakhstan

Institute of Combustion Problems

Almaty, Kazakhstan
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Hannora A.E.,Suez Canal University | Mukasyan A.S.,University of Notre Dame | Mansurov Z.A.,Institute of Combustion Problems
Bioinorganic Chemistry and Applications | Year: 2012

A novel approach for depositing hydroxyapatite (HA) films on titanium substrates by using mechanical alloying (MA) technique has been developed. However, it was shown that one-hour heat treatment at 800°C of such mechanically coated HA layer leads to partial transformation of desired HA phase to beta-tri-calcium phosphate (β-TCP) phase. It appears that the grain boundary and interface defects formed during MA promote this transformation. It was discovered that doping HA by silicon results in hindering this phase transformation process. The Si-doped HA does not show phase transition to β-TCP or decomposition after heat treatment even at 900°C. Copyright © 2012 Ahmed E. Hannora et al.


Mansurov Z.,Institute of Combustion Problems
Advanced Materials Research | Year: 2012

An experimental study has been conducted in premixed and counterflow diffusion flames in order to obtain the nanocarbon materials. In this paper the synthesis of fullerenes, carbon nanotubes and superhydrophobic soot surface in the regime of hydrocarbon flames were studied. The original results in the field of synthesis of fullerenes, carbon nanotubes and syperhydrophobic soot in hydrocarbon flames were carried out for the last years at the Institute of Combustion Problems. © (2012) Trans Tech Publications, Switzerland.


Mansurov Z.A.,Institute of Combustion Problems
Combustion, Explosion and Shock Waves | Year: 2012

This paper presents original results in the area of synthesis of fullerenes, carbon nanotubes, and superhydrophobic soot in hydrocarbon flames and data on the self-propagating hightemperature synthesis of nanomaterials obtained in recent years at the Institute of Combustion Problems. © 2012 by Pleiades Publishing, Ltd.


Ksandopulo G.I.,Institute of Combustion Problems
International Journal of Self-Propagating High-Temperature Synthesis | Year: 2011

Potential possibility of using centrifugal forces for production of noble ferroalloys was demonstrated for aluminothermic systems taken as an example. Combustibility limits in the field of centrifugal forces were associated with the onset of adiabatic conditions for combustion due to acceleration of combustion front by melted metal particles returned into the reaction zone by centrifugal forces. © 2011 Allerton Press, Inc.


Ksandopulo G.I.,Institute of Combustion Problems
Russian Journal of Physical Chemistry B | Year: 2011

Based on the postulate of competition between two mechanisms of fuel conversion (low-temperature autocatalysis (A) and high-temperature thermal self-acceleration (T) in the flame front, a method for determining the degree of staging S of the flame of a given fuel-air mixture is proposed. Zones with prevalence of each of these mechanisms, the activity of which depends on the initial fuel concentration C0, temperature T0, and pressure P, are identified. A quantitative method for determining S consists in calculating the ratio of the maximum rates of fuel and oxygen consumption and water formation in zones A (AKi) and T (Ki) from mass-spectrometric analysis of the flame front. The S < 1 values correspond to the monofront (before bifurcation), whereas S > 1, to the bifront (after bifurcation). Bifurcation point arises as a result of the increase of the negative temperature coefficient (NTC) associated with the difference AKi - TKi = ε becoming positive, which is the criterion of occurrence of bifurcation. At ε ≤ 0, in the profiles of the rates of fuel and oxygen consumption and water formation, the NTC zone between zones A and T expands. At ε > 0, the monofront turns into a bifront. It was established that the effect of T 0 on the shape of the curves of the rates of formation and accumulation of other combustion products typical of zone T, except for O 2, fuel, and water, is small, if any. Experimental data on massspectrometric analysis of combustible mixtures of pentane with C0 = α = 1.4, 1.5, and 1.7 are for the first time presented. Results of calculations of S from previously published data on probing the front of flames C1-C6 hydrocarbon are presented. It is shown that S for all the flames is a smoothly varying function of C0 to the bifurcation point. The dependence of S on T0 is negative. Flames with the same values of S are identical. © Pleiades Publishing, Ltd., 2011.


Mansurov Z.A.,Institute of Combustion Problems
International Journal of Self-Propagating High-Temperature Synthesis | Year: 2011

The synthesis of fullerenes, carbon nanotubes, and superhydrophobic soot in hydrocarbon flames was briefly overviewed. © 2011 Allerton Press, Inc.


Mansurov Z.A.,Institute of Combustion Problems
Eurasian Chemico-Technological Journal | Year: 2011

Usage of combustion processes for production of target products is less common than the application of catalytic processes. However, there are known examples of production of carbon black, HCl, TiO2 etc. Some research work was done at the Institute of Combustion Problems (Almaty, Kazakhstan) consider the synthesis in flame of carbon nanomaterials: fullerenes, nanotubes and soot nanobeads with superhydrophobic surface. An alternative of fullerenes and nanotubes synthesis in arc discharge of graphite is the method using stationary hydrocarbon flames. Flame is a self-sustaining system in which the hydrocarbons can be precursors of carbon nanomaterials, and the heat released during combustion, is a parameters of the process control. It is known that PAH are nucleation centers of forming soot i.e. PAH can be converted into either soot or fullerenes. The formation of CNTs occurs in diffusion flames from the fuel side and is initiated by transition metals particles. The paper presents data on the formation of fullerenes and carbon nanotubes as well as soot with the superhydrophobic surface, obtained on nickel and silicon supports in benzene-oxygen and propane-oxygen diffusion flames. New results regarding the synthesis of superhydrophobic surface with a contact angle 135-175° have great practical interest as anti-corrosion additives to various materials. © 2011 al-Farabi Kazakh National University.


Antsupov E.V.,Institute of Combustion Problems | Antsupov E.V.,Russian Academy of Sciences
Russian Journal of Physical Chemistry B | Year: 2010

Experimental data on the flame-extinguishing ability of multicomponent mixtures of powder inhibitors regarding propane-air flames are presented. It is demonstrated that mixtures exhibiting synergism and high flame-extinguishing ability can be used as the active component in fire-fighting powders (mixtures of potassium carbonate with sodium fluoride or sodium hydrocarbonate). The procedure for selecting the components of effective multicomponent mixtures is analyzed. © Pleiades Publishing, Ltd., 2010.


Potential economic possibility of using centrifugal force for production of noble ferroalloys is shown. Connected with this process, the limits of stable combustion are conditioned by formation of adiabatic regime of combustion due to the effect of acceleration of the combustion front by centrifuged particles of melted metal product. There appears the possibility to create a continuous technology of production of ferroalloys on the basis of aluminothermy and of significantly decreased low limit concentration of the sought for metal in the initial row material. © 2011 al-Farabi Kazakh National University.


Baideldonova A.,Institute of Combustion Problems | Ksandopulo G.,Institute of Combustion Problems | Mukhina L.,Institute of Combustion Problems
IOP Conference Series: Materials Science and Engineering | Year: 2016

According to the task of obtaining substances with the free valence for the linkage of the nano-powders, the procedure of the synthesis of materials under the extreme nonequilibrium conditions is presented. The combustion of multilayer aluminothermic systems in the revolving reactor was investigated. Experiments were carried out in the reactor of high-temperature centrifuge. The initiation of process realizes by electric pulse in the effective layer. Further the wave of combustion was propagated along the axis of the reactor. The particles of the restored metal penetrated the underlayers of fresh mixture under the action of centrifugal acceleration and created the additional centers of ignition. The higher the density of metal, the higher speed and depth of penetration. An increase in the centrifugal acceleration strengthens the activity of process also. The speed of the motion of metallic particles grows. According the theoretical calculations it reaches 90 m/s in the case of tungsten. © Published under licence by IOP Publishing Ltd.

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