METHOD OF LOCAL PROCESSING STEEL ARTICLES UNDER IONIC NITROGEN IN MAGNETIC FIELD Russian patent published in 2018 - IPC C23C8/36 

FIELD: chemistry.

SUBSTANCE: method of local ionic nitriding of the steel product includes performing vacuum heating of the steel product in a nitrogen plasma of increased density, the nitrogen plasma of increased density being formed in the toroidal region of the oscillating electrons moving along the cycloidal closed trajectories formed by the crossed electric and magnetic fields by means of a magnetic system made with liquid cooling and containing stationary magnets. The steel article is positioned to ensure the location of the area to be nitrided in a magnetic field in the high-density nitrogen plasma zone to intensify the diffusion saturation of this region and to form the nitriding zone in a magnetic field. The transition zone of nitriding is provided at a portion of the steel product remote from the magnetic system and located between a portion of the said article with a nitriding zone in a magnetic field, in which the effective thickness of the nitrided layer is 80 mcm and a portion of the said article with a nitriding zone outside the magnetic field, on which the effective thickness of the nitrided layer is 40 mcm.

EFFECT: increasing the contact durability and wear resistance of the product surface due to its local processing.

3 dwg, 1 ex