Abstract
On the basis of the development of a new general approach for the modelling of diffusion mass transfer through a two-phase region in multicomponent systems, a theoretical study of the B 4C/Zircaloy interaction kinetics is presented. The proposed theory explains qualitatively the peculiarities of the reaction system behavior in the temperature range 800 to 1500°C up to the onset of the eutectic liquid phase formation in the reaction zone, and describes quantitatively the reaction kinetics measured experimentally. It is shown that the growth of the reaction zone, which consists of one reaction layer (two-phase mixture of ZrB 2 and ZrC) between 800 and 1100°C, and of two layers (a similar two-phase layer and a new single-phase layer ZrB 2) between 1200 and 1500°C, can be described by one Arrhenius correlation: x 2/ t = 2.38 × 10 −4 exp(−170840/ RT) cm 2/ s.
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