Model of mass transfer in the titanium surface layer after compression plasma flows influence

Abstract

Compression plasma flows generated by a magneto-plasma compressor are perspective type of concentrated energy flows used for materials properties modification. Such plasma flows are characterized by a high concentration of charged particles and a small divergence of the plasma stream that are give risen by the own magnetic field. These peculiarities of the compression plasma flows provide the long time of stable existing of the flow that is up to 100 – 140 􀁐s. The last time the compression plasma flows became to be used not only for structure and properties materials modification but also for the alloying of them with other elements. For this aim the plasma flow influences on a “coating/substrate” system. Variation both of the coating thickness and plasma flow energy can provide any elemental composition of the alloy that can not be reached in traditional methods. In this account revealing the main mechanisms of mass transfer in the surface layers of the materials undergone plasma flow influence is an actual problem. In previous works the authors described the mass transfer as a convective mechanism. Nevertheless the quantitative parameters of this phenomenon were not determined. The purpose of the presence work is determination of the main physical principles of heat and mass transfer in the surface layers of titanium alloyed with chromium atoms by means of compression plasma flows influence.