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INNOVATIVE TECHNOLOGY

● surfacing hard alloys, in particular generated mainly at the contact points of
stellites (based on tungsten carbide and tungsten carbide grains with the surface of
cobalt), rhenite (based on an alloy of tungsten the sample. For reliable process flow in this
and carbon of eutectic composition), sormets case, a certain gap is required between the
(based on iron - chromium - manganese - electrode and the part, which is ensured by
nickel - titanium and other metals, metal the almost rough surface of the roller. Thus,
carbides and nitrides ); initially the effect of introducing current into
● powder mixtures, in particular the system consists in a sharp, spasmodic
vocars (a mixture of tungsten and carbon increase in the temperature of the surface
of different ratios), boride mixtures; layer of the part and simultaneous
● ground powders of alloys of the mechanical introduction of carbide particles
type U40X28NS2VM (based on high alloy tungsten. Analysis of the diffusion zone
steels containing titanium, chromium, shows that a pronounced texture is
molybdenum, nickel, etc.). observed only from the side of the coating.
The thermophysical analysis of the No noticeable deformation zones were
"sample - coating" system with the use found on the surface of the sample, and,
of electric contact heating suggests that, therefore, the thermal regime allows one
unlike, for example, the plasma method or to form coating on ready-to-work complex
welding, the surface of the product heats parts and tools without further mechanical
more than the coating material. Heat is processing.

Sh.A. Karimov, E.O. Umarov, E. Khushvaktov.
Tashkent State Technical University

References:

1. Avseevich O.I. On the patterns of erosion in pulsed discharges. Moscow. Mechanical Engineering. 1982. p. 32 - 42.
2. Kisaev I.R. Cathode processes of an electric arc. 1968. Moscow. Science. 244 p.
3. Properties, preparation and field of application of refractory compounds: reference edited by Kosolapova T.Ya.
Moscow. Metallurgy. 1986. 928 p.
4. Eremenko V.I., Naidich Yu.V., Lavrinenko I.A. Sintering in the presence of a liquid metal phase. Kiev. Naukova
Dumka. 1963. 123 p.
5. Kuzmenko P. P. Electric transport, thermal transfer and diffusion in metals. Kiev: Vyshaya shkola. 1983.151 p.
6. Skorokhodov V.V., Solonini S.M. Physical and metallurgical fundamentals of powder sintering. Moscow. Metallurgy.
1984. 158 p.
7. Libenson G.A. Fundamentals of powder metallurgy. Moscow. Metallurgy. 1975. 200 p.
8. Raichenko A.I., Morozov A.S., Popov V.P. Powder Metallurgy 198. No. 2, p. 41 - 44.
9. Hara Z., Akechi K., Itabashi M. Japan. Soc. Powder and Powder Met. 1975. V. 22, No. 3, pp. 101-106.

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