Rakhova Nurgul

Scopus Publications

Combustion processes of gas generators in the form of cartridges on the basis of ammonium nitrate, flammable nanoaluminum and nanocarbon additives
Journal of Chemical Technology and Metallurgy, 2020
Preparation and test of slowly burning energy-intensive materials with time-delay composition
Journal of Chemical Technology and Metallurgy, 2019
Preparation of mechanically activated mixtures of titanium with the carbon nanotubes and study of their properties under thermal explosion
Sh Gabdrashova, N Rakhova, I Pustovalov, Zh Elemesova, Marat Tulepov, et al.
Rasayan Journal of Chemistry, 2018
The aim of the work was to study the effect of preliminary mechanical activation of titanium powder mixtures with the carbon nanotubes on a possibility of realization of the self-propagating interaction of reagents in the mode of dynamic thermal explosion and influence on phase composition and morphology of the formed products. It was found that after 2 min. mechanical activation, mechanocomposites of various sizes of irregular shape are formed, some of which are lamellar. There are no carbon nanotubes on the surface of titanium particles, which indicates their incorporation into the volume of mechanocomposites. The thermal explosion in activated samples of composition Ti+4% carbon nanotubes is realized starting from 1.5 min of mechanoactivation. The nature of the thermal explosion varies with the increase in the time of preliminary mechanical activation. After 3 min. of mechanoactivation in the sample at 346C, the preliminary smooth heat release starts at a temperature of 441C, and a thermal explosion occurs, the maximum temperature is 930C. The phase composition of the products of the thermal explosion of the system under investigation is practically independent of the time of the preliminary mechanical activation. When the mechanical activation time is increased from 1.5 to 7 min., the products of the thermal explosion are titanium and titanium carbide.
Development of gas-generator chemical cartridges working in the mode of non-explosive destructive mixture
Marat Tulepov, Sh Gabdrashova, N Rakhova, L.R. Sassykova, Д.А. Байсейтов, et al.
Rasayan Journal of Chemistry, 2018
The work aim was the choice of technology that provides the possibility of destruction of various construction objects without the creation of shock, seismic waves, fragmentation, dust formation, concomitant detonation crushing with minimal emission of harmful substances. Preparation of the gas-chemical cartridges containing carbon nanomaterials was the result of researches. The composition of the non-explosive destructive mixture based on materials of Kazakhstan origin developing expansion force in a closed volume up to 30 MPa is developed. A composition of a fast-hardening mixture having a hardening rate of 8 MPa/h is created. The maximum level of strength of cement stone non-explosive breaking mixture for 30 min. hardening reaches 23 MPa. The hardening time of fast-hardening mixtures with a non-explosive breaking mixture was 15-20 min. In the case of using gas-chemical cartridges of the developed composition, the role of the carbon nanomaterial in it was determined by the low combustion rates of the composition and, very importantly, by slow ignition (the combustion of a single cartridge lasts up to 0.3 s under blasthole conditions). As a result of the carried out researches, it was found out that the range of scattering of splinters of concrete will depend on the amount of gas-generator composition, of its chemical composition and the burning rate. The developed technologies allow carrying out sparing blasting during the destruction of concrete brick structures in conditions of the dense building.
Methods of reducing the front performance flame at the underground mines work
M. I. Tulepov, Z. A. Mansurov, Yu. V. Kazakov, F. Yu. Abdrakova, Z. L. Sultanova, N. M. Rakhova, S. S. Madiyev, O. Yu. Golovchenko, L. R. Sassykova, D. M. Tolep, N. Chikhradze, M. N. Chikhradze
Oriental Journal of Chemistry, 2018
The aim of the study was to develop methods to reduce the penetration ability of the flame front and red-hot striking elements that propagate in the confined space of mines. In the article is considered a method for localizing explosions of a methane-dust mixture in coal mines, by creating an aqueous barrier (increased density) in the propagation path of the flame front and incandescent particles, using a high-energy pyrotechnic composition based on nanoaluminum. The optimal pyrotechnic composition contents of ammonium nitrate - 50%, smokeless powder - 45%, magnesium - 3% and nanoaluminum - 2%. This composition punched the target to a depth of 6.5 mm with a barrier thickness of 50 mm. Water cannon with a nozzle with a diameter of 80mm, allows to localize the spread of the flame front.