L. G. Raskolenko

Combustion of vanadium-iron alloys in nitrogen

The starting alloys were prepared from specially pure carbonyl iron (99.8% Fe) and electrolytic vanadium VEL-1 (99.8% V) in a vacuum furnace, crushed to a powder with particle size less than 0.14 mm and pressed into pellets with a relative density of 0.48-0.64. The burning of the alloys is described. The nitrogen pressure in the bomb was varied from 1 to 130 atm. In the experiments the burning specimens were frequently quenched in water. The starting material and combustion products were analyzed radiographically and metallographically. The paper discusses effect of iron content of alloy on burning rate and extent of reaction, as well as laws of combustion of alpha- and sigma-ferrovanadium. A review is given of phase transition to sigma-ferrovanadium combustion. A discussion of the results is presented.

Sintering of the reaction products of combustion of alloys in nitrogen

An investigation of the mechanism of compacting of Fe-V alloy with a sigma-phase structure, a low porosity composite material consisting of alpha-iron and a filler of delta-vanadium nitride, is made after the synthesis surge. Alloys containing 50 wt.% Fe were prepared by sintering in a vacuum furnace of powders of type VEL-1 vandium and special purity carbonyl iron. The mechanism of compacting was studied on specimens in hardened water. Metallographic investigations were made on MIM-7 and PMT-3 instruments and the phase analysis on a DRON-2 instrument. Rapid compacting in combustion of sigma-FeV in nitrogen is determined by combining of the solid-liquid drops formed in the combustion front and consisting of molten iron and vanadium nitrides.

Influence of ultrasonic vibrations on the combustion of condensed systems with solid-phase reaction products

It has been shown in the example of the combustion of the Ti-B system that high-frequency mechanical vibrations under the conditions of the limiting action of liquid titanium filtration result in significant increase in the combustion velocity. The influence of ultrasonic vibrations on the formation of the final reaction product is investigated in this paper, with the system Ti-B-Fe selected for the tests.

Regularities and mechanism of combustion of the system Ti-B-Fe

At the present time the gasless combustion of two-component systems has been studied most completely [i], while the regularities and mechanism of the combustion of multicomponent compositions have been investigated inadequately. Presented in the example of Ti--B--Fe in this paper are experimental results of the combustion of a three-component system. Stable stationary modes of combustion wave propagation are examined, nonstationary phenomena in the combustion of this system were studied earlier [2, 3].