Khachatur Kirakosyan

National Academy of Sciences of Armenia | NAS RA · A. B. Nalbandyan Institute of Chemical Physics

The possibilities of the synthesis of submicron MoSi2 and MoSi2–Si3N4 composite powders were investigated using inorganic salt-assisted combustion synthesis method. Combustion laws in the MoO3–3Mg–2Si–NaCl and Mo–5Si–NaCl–Si3N4–N2 systems were studied. The main factors influencing the combustion parameters, phase composition and microstructure of p...

It has been studied the possibility to synthesize the new catalytic systems, based on a carbon carrier precipitated tungsten carbides, under the self-propagating combustion regime. For this purpose the tungsten (VI) oxide deposited on a surface of the fine-grained carbon black was reduced by magnesium under the combustion mode. Uniform structures o...

The dynamic features of Al2O3 - polytetrafluoroethylene (PTFE) and Al - PTFE reactions in non-isothermal conditions are presented. The Differential Scanning Calorimetry (DSC) and High-Speed Temperature Scanner (HSTS) were used to characterize the Al2O3/Al – PTFE reactions at different heating rates. The study shows that the HSTS instrument can give...

The present work was undertaken to study the chemistry and phase formation mechanism in the salt-controlled MoO3 + Mg + NaCl thermite reaction. It was found that the structure and phase formation mechanism in the studied system primarily depend on the salt content in the initial mixtures. In salt-poor mixtures, nucleation of product particles takes...

A novel wet-combustion method is developed to functionalize mesoporous network of alumina nanofibers. The wet-combustion method includes coating the nanofibers with the solution of the precursors of dopants mixed with fuels, followed by dissociation/oxidation of the precursors in a combustion mode. Due to the high temperature of the flame and short...

Differential scanning calorimetry and a high-speed temperature scanner were used to characterize dynamic features of the reaction between polytetrafluoro-ethylene (PTFE) and Al 2 O 3 under heating rates ranging between 20 and 780 °C min -1 . Exothermic reaction behavior between PTFE and Al 2 O 3 was observed at heating rates of 150 °C min -1 and hi...

A new electrothermographic method, viz. high-speed temperature scanning, was applied to kinetic studies of reactions taking place in the Ni-Al system, including those after mechanical activation in a planetary ball mill. Treatment of the temperature profiles taken at different heating rates in terms of the Kissinger-Akahira-Sunose (KAS) approximati...

Copper oxide-doped alumina nanofibres were fabricated by the solution combustion method. The bundled alumina nanofibres were impregnated with a copper nitrate–glycine (oxidizer–fuel) solution and heat-treated in an open-air environment at 400 °C for 30 min. The microstructure and phase composition of the final product were characterized by XRD, SEM...