Abstract and keywords
Abstract (English):
In the paper there is considered a new paper of plasma carbonization with the use of a graphite coating consisting of graphite, liquid glass and others. A procedure of coating production and the fulfillment of the experiment on coating and melting are shown. A new mechanism of carbon diffusion from coating into metal under the influence of plasma electric arc is offered. The character of surface micro-relief changes after carbonization is analyzed. When using the mentioned method of carbonization it is possible to increase micro-hardness of steel St3 4-5 times (up to 12000 MPa). The depth of a carbonized layer is within the limits of 50-200 µm (in the mode without surface melting) and 300 - 3000µm (in the mode of surface melting). It is shown that the application of liquid glass at the coating formation has a positive effect on surface roughness with the increase of liquid glass quantity roughness decreases.

Keywords:
plasma carbonization, paste, carbonization, diffusion, micro-hardness, micro-relief, roughness.
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