POWDER FOR MAGNETIC-ABRASIVE TREATMENT OF THE SURFACE OF A TUBULAR SHELL OF A FUEL ROD MADE OF FERRITIC-MARTENSITIC STEEL AND A METHOD FOR MODIFYING THE SURFACE USING IT Russian patent published in 2023 - IPC B22F1/05 B24B31/112 

FIELD: abrasive surface treatment.

SUBSTANCE: invention relates to a method for modifying the surface of a fuel rod cladding made of ferritic-martensitic steel. Powder for magnetic-abrasive surface treatment contains a ferromagnetic matrix with 5%α aluminium oxide αAl₂O₃ and has a size of 100-300 microns. The method for modifying the surface of a tubular cladding of a fuel element includes magnetic-abrasive treatment in a facility with a magnetic system based on permanent magnets with the formation of a uniform oxide layer on said surface. The surface to be treated is placed between the rotating magnetic poles of the magnetic system and processed by rotating the tubular shell at a rotation speed of 100-200 rpm with simultaneous movement of the magnetic system along the rotation axis with a displacement frequency of 100-150 cycles/minute for 2-3 minutes.

EFFECT: increased corrosion resistance of ferritic-martensitic steel.

4 cl, 2 tbl, 4 dwg