| SM ISO690:2012|
VERKHOTUROV, Anatoly; IVANOV, Valeriy; KONEVTSOV, Leonid. On the issue of forming a doped layer at ESD metal surfaces A.D.. In: Materials Science and Condensed Matter Physics. Editia 8, 12-16 septembrie 2016, Chişinău. Chişinău: Institutul de Fizică Aplicată, 2016, p. 351. ISBN 978-9975-9787-1-2.
|Materials Science and Condensed Matter Physics
Editia 8, 2016
Conferința "International Conference on Materials Science and Condensed Matter Physics" |
8-th Edition, Chişinău, Moldova, 12-16 septembrie 2016
A feature of spark alloying process (ESA) for many materials (refractory metals, alloys, etc..) Is nonadditivity transfer material of the anode to the cathode. Previously it is shown that the integral effect of the process of mass transfer of the anode to the cathode material is extensive and is not a simple sum of the effect material transfer from individual pulses. In this regard, there is a number of characteristic dependence of the kinetics of mass transfer material from the anode to the cathode (Fig. 1), the analysis of which allows reasonable approach to the choice of materials as an electrode, and the optimal treatment regimens. The report contains data forming drug research on various installations and processing modes using different metals, their compounds, including tungsten carbide. It is found that in most cases there is a characteristic curve with a maximum increment of the cathode mass changes (the so-called "curve Lazarenko" - Figure 1, curve 1.). It was shown a significant effect on the formation of secondary structures PM (appearance of the anode and cathode of oxides, nitrides, intermetallics, reverse transport of anode material on the cathode is also possible, mainly in the vapor phase). Based on the experimental data of phase, chemical, structural analyzes, kinetic dependences of the formation of drugs found that this process in the ESA can be divided into two stages, during which there are: 1) the initial period of formation on the electrodes of secondary structures; 2) in the second phase the formation of drugs is carried out in the presence of secondary structures of the anode and cathode and by transferring some of the polar mass of the anode. In most cases, the ESD process of secondary structures with the electrodes do not contribute to the maximum efficiency, as the faster the brittle fracture threshold. It is shown that the process of stabilization ESD due to the formation of secondary structures in the air occurs earlier than in the protective media (argon, nitrogen), which prevents mass transfer further anodic material for forming PM.