THE ROLE OF EXPERIMENTAL PARAMETERS IN COMBUSTION SYNTHESIS OF NIAL UNDER HIGH GAS-PRESSURE

High pressure self propagating synthesis (HPSHS) was used to synthesis e the NiAl compound. In this paper, the influence of both the kinetic and the thermal effects of the reaction on propagation were studied by using Boddington's model. This analysis was based on experimental res ults and it shows clearly that pressure and heating rate have great im portance in the nature and the stability of the reaction between nicke l and aluminium. In effect, we will show clearly the existence of thre e domains of reaction modes: solid state diffusion, unstable SHS and s table SHS. Additionally, we tried to define the influence of experimen tal parameters such as grain size of the reactants and porosity of the sample. (C) 1998 Elsevier Science S.A.