METHOD OF PROCESSING OF CONTACTING SEALING SURFACES ELEMENTS MADE FROM HEAT-RESISTANT ALLOYS OF THE PULSE FACE SEAL (PFS) OPERATING IN CRYOGENIC ENVIRONMENTS (VARIANTS) Russian patent published in 2018 - IPC B23H9/00 

FIELD: molding.

SUBSTANCE: invention relates to the field of electrophysical and electrochemical machining, in particular to electroerosive alloying, and can be used for surfaces treatment of the impulse end seals elements. First variant of the method includes electroerosive alloying of the contacting surfaces made from the heat-resistant alloy HN58MBUD graphite electrode in front of which an electroerosive coating of copper or nickel is applied to contact surface at a discharge energy Wu = 0.04 J and Wu = 0.03 J, respectively, and to the other contact surface an electroerosive coating of copper is applied at a discharge energy of Wu = 0.02 J, besides the doping with a graphite electrode is performed at a discharge energy of Wu = 0.05-0.2 J. Second variant of the method includes electroerosive alloying of the contacting surfaces from beryllium bronze BrB2 with a graphite electrode in front of which an electroerosive coating of copper is applied to one of the contacting surfaces at a discharge energy of Wu = 0.08 J, wherein the doping with a graphite electrode is performed at a discharge energy of Wu = 0.05-0.2 J.

EFFECT: invention provides a reduction in microhardness and an increase in ductility of the contacting sealing surfaces of the pulse mechanical seal elements to reduce the contact pressure and increase the tightness of the joint.

2 cl, 1 tbl