Explosive Burning of a Mechanically Activated Al and CuO Thermite Mixture

The results of experiments to determine the role of structural schemes for the ignition of a mechanically activated thermite mixture Al–CuO and the formation of its combustion flame are presented. The reaction initiated in the bulk of the experimental assembly transforms into torch combustion in an open space. The dynamics of the volume of the flame reaction region was determined. The stage of flame formation has a stochastic character, determined by the random distribution of the reaction centres in the initial volume of the components. A high-speed camera, a pyrometer and electro contact sensors were used as diagnostic tools. The ultimate goal of the study was to optimize the conditions for the flame formation of this mixture for its effective use with a single ignition of various gas emissions.

Thermostimulation of titanium aluminide synthesis by high-calorie mixtures

A comparative microstructural and phase analysis of titanium aluminide samples obtained by SHS method in shells from a highly exothermic thermite mixture and an equimolar mixture of Nickel and aluminum is carried out. The energy of exothermic reactions of the shells allows heating the charge on the basis of titanium and aluminum and starting the SHS reaction in it. In the sinter sample in the Ni-Al shell, the reaction of titanium aluminide synthesis was not complete; the samples have a high-porous structure with small frame inclusions of intermetallides. In the synthesis of samples in the shell of the thermite mixture obtained alloy, optimal porosity and structure. The main phase in the samples obtained in different modes is titanium aluminide, also in both samples there are inclusions enriched in titanium (Ti3Al, Ti2Al phases), while the phase analysis did not reveal the presence of the initial components of the charge.

Optimum flame gunning processes and effective gunning mass for hot repair of non-ferrous metallurgy units

The process of torch gunning and applied gunning mass in ferrous metallurgy is investigated. The increase in the durability of the lining of non-ferrous metallurgy heat units was investigated by means of lining repair without stopping the units using the torch gunning method. A special gunning mass has been developed taking into account the specific service conditions of the lining of these units. It has been established that in order to lower the temperature, it is necessary to introduce a low-melting component or thermite mixture into the gunning mass, which operates according to the principle of self-propagating high-temperature synthesis (CBC). The design of the gunning unit was created taking into account the properties of the gunning mass. Tests of new gunships, gunning masses at the non-ferrous metallurgy plants showed an increase in the resistance of linings by 1.8-2.5 times. Ill. 4. Ref. 7. Tab. 2.