METHOD OF VACUUM CARBIDISATION OF METAL SURFACES Russian patent published in 2020 - IPC B23H5/00 B23H9/00 C23C14/06 C23C28/00 

FIELD: technological processes.

SUBSTANCE: invention relates to electrophysical methods of applying coatings on transition metals of IV-VI groups and alloys based on them to form coating with thickness of up to 200 mcm, containing carbides, carbon in form of inclusions in volume of coating and carbon layer on surface. Method includes evacuation of working space of chamber, supply of argon or its mixture with gases from series of aliphatic hydrocarbons with number of carbon atoms not more than three, with molar fraction of hydrocarbon in mixture of 0–80 %, pressure stabilization in range of 0.05–3 Pa, multiple scanning of the processed surface area by the rotating carbon electrode in the touch mode of the surface with a scanning step not exceeding half the diameter of the electrode end face, feeding between electrode and surface of electric pulses of cathodic or anode polarity with voltage of 30–150 V with duration of 40–300 mcs and repetition frequency of 20–3,000 Hz. Multiple scanning is carried out while overlapping successive tracks and the number of passes over each surface of surface is 5–30 times. Said gases from a series of aliphatic hydrocarbons with not more than three carbon atoms are represented by methane, ethane, propane, ethylene, propylene and acetylene.

EFFECT: method reduces the processing time and provides high content of carbide phase in the coating, formation of a solid layer of amorphous carbon on the surface, as well as low coefficient of friction and wear rate.

4 cl, 7 dwg, 1 tbl, 4 ex