scholarly journals Self-Propagating High-Temperature Synthesis under the Conditions of Rotation and Characteristic Heat and Concentration Limits on the Example of Oxide Systems

2011 ◽  
Vol 13 (3-4) ◽  
pp. 149
Author(s):  
Georgij I. Ksandopulo

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.

2007 ◽  
Vol 280-283 ◽  
pp. 1467-1470 ◽  
Author(s):  
Jian Ying Gao ◽  
Wan Jiang ◽  
Gang Wang

A combustion front quenching (CFQ) technique was used to investigate the mechanism of selfpropagating high-temperature synthesis (SHS) of MoSi2 from Mo and Si powders. Based on the experimental results, a combination of reactive diffusion and dissolution-precipitation mechanism of the formation of MoSi2 was proposed, and a model corresponding to this mechanism was drawn.


2006 ◽  
Vol 45 ◽  
pp. 979-988 ◽  
Author(s):  
Frédéric Bernard ◽  
Sébastien Paris ◽  
Eric Gaffet

The use of mechanical activation (the elemental powder mixture is milled for a short time at given frequency and impact energy) as a precursor to self-propagating high-temperature synthesis (SHS) results in the formation of nanostructured porous materials. The mechanical activation step was found necessary (i) to modify the thermal parameters of the combustion front (i.e. combustion front velocity, thermal heating rate…) in the cases of Mo-Si, Fe-Al, Ni-Si (ii) to initiate a combustion front in the case of systems having a low exothermicity. Nevertheless, the control of the mechanically activated mixture characteristics and, the understanding of the mechanical activation role on the SHS parameters are essential to produce end-products with expected microstructure.


2016 ◽  
Vol 2 (2) ◽  
pp. 181 ◽  
Author(s):  
G.I. Ksandopulo ◽  
N.N. Mofa ◽  
T.A. Ketegenov ◽  
O.V. Cherviakova ◽  
O.A. Tyumentseva

<p>The differences of the effects of mechanical substance pre-activation in the mills with divers force effect schemes on the self-propagating high temperature synthesis (SHS) of the SiO<sub>2</sub> + 37.5 % Al system are shown. The power saturation of activated material is determined by particle defect intensity and effects on the thermal and physical characteristics of the material. The variations of activated material state are estimated referring on the variations of dilatometry curve paths. The effects of activation time on the temperature of sample self-ignition in the furnace, combustion temperature and completeness of the quartz reaction with aluminum are determined. The enhancing effects of organic modificators of quartz particle surfaces on the further SH synthesis development are shown.</p>


2007 ◽  
Vol 43 (4) ◽  
pp. 239-242
Author(s):  
S. Kh. Suleimanov ◽  
O. A. Dudko ◽  
V. G. Dyskin ◽  
Z. S. Settarova ◽  
M. U. Dzhanklych

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