Thermokinetics of reaction processes initiated by contact melting in metal powder mixtures on the basis of nickel with aluminum

Abstract

Thermokinetics of interaction processes in the reaction mixtures based on nickel and aluminum in a wide range of concentration was studied using high-speed temperature recorder on the basis of the analog digital converter. At the initial stage an exponential growth of temperature is replaced by a linear dependence in relation to the competition of the dissolution of the solid component in the peritectic liquid and heat of the reaction. It was found non-linear nature of the interaction, as in the step of self-steepening of exothermic reaction, and in subsequent time slots of its course. There was obtained a dependence of the rate of temperature increase in step of self-steepening on component concentration. The maximum growth of rate was observed in the concentrations of the components of equiatomic composition.