Combustion Wave Propagation in Conjugated Systems of a Powder Mixture of Ni+Al+Al2O3 and a Metal Plate
R. M. Gabbasov1, V. D. Kitler1, V. G. Prokof'ev1,2, A. M. Shul'pekov1
1Tomsk Scientific Center, Siberian Branch, Russian Academy of Sciences, Tomsk, 634021 Russia
2Tomsk State University, Tomsk, 634050 Russia
Keywords: functionally gradient, reaction front, burning rate, heat recovery
Abstract
The synthesis of an intermetallic compound in a mixture of Ni + Al + Al2O3 powders with an inner metal plate oriented in the direction of propagation of the combustion wave has been studied by experiments and theoretical calculations as applied to the problem of self-propagating high-temperature synthesis of functionally gradient materials. Copper, titanium, and steel plates are considered. The propagation of the exothermic reaction front is analyzed for various thermophysical characteristics of the inner metal layer. In samples with a copper plate, the combustion front near the contact boundaries is stretched in the direction of the combustion wave. Increase in the average burning rate of the sample with the heat recovery effect is observed when using copper plates 1 ÷ 3 mm thick. During combustion of samples with titanium and steel plates, there is a deceleration of combustion wave propagation along the contact boundary.
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