I.V. Zuev, O.Y. Goreva, A.G.Galkin, K.Y. Choi
Moscow Power Engineering Institute - Technical University, Moscow, Russia

   Based on some appoaches knowon in the flield of power engineering, an interpretation of kinetics for the process of joining two condensed mediums with due regard for the suface diffussion processes is suggested. Proceeding from electromagnetic theory for interaction of condensed mediums conceived by Prof. E.M. Lifsitz it is possible to obtain a substantiated patten for setting of said meiums, i.e. the process characterized by closing or bringing them together up the actual contact including chemical interaction between them. Said interaction is based on knowledge of electromagnetic radiation and absorption of electromagnetic waves by atoms and molecules. The results of calculations of energy parameters for bringing together the two condensed mediums to a gap of H = 10 À = 10^-7 cm (wich is equal to two lattice parameters) show that the magnitude of interaction energy is of the order of magnitude of the moiten metal enthalpy. It means that there is no point in bringing the materials together when welding them together to interatomic distance. To draw the surfaces of such materials together to H = 10 À spacing between them will suffice to let the surface diffusion to sew up such a gap very fast just for 10^-8 - 10^-6 s. From the power engineering point of view, this correcponds to meiting of materials in contact.

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