METHOD FOR OBTAINING WEAR-RESISTANT COATING Russian patent published in 2021 - IPC C23C4/129 C23C4/02 C23C4/06 

FIELD: metal part wear-resistance.

SUBSTANCE: invention relates to methods that increase the wear resistance of the surfaces of metal parts by changing the composition and structure of their surface layers, and can be used in the manufacture of parts operating under conditions of waterjet and cavitation wear at operating temperatures below 273 K. A method for obtaining a wear-resistant coating from high-entropy alloys with a shape memory effect for steel parts includes layer-by-layer application of powder material by high-speed flame spraying in a protective argon atmosphere, and the application of the first adhesive layer from mechanically activated Ni powder is carried out with a thickness of 50-100 microns, the application of the second transition layer from a mixture of FeNi-TiNi powders taken in an equal ratio is carried out with a thickness of 100-150 microns, and the application of the third layer is carried out from a high-entropy alloy with a shape memory effect FeNiCoAlXB, thickness of 750-850 microns, where the impurity component X is Ti, Ta, Nb, Cr or W, with the following ratio of components in the alloy, at. %: Fe 40.95-42.96, Ni 28-30, Co 15-17, Al 10-11.5, X 2-2. 5, B 0.04-0.05,while before applying the powder material, the surface of the part is additionally prepared, including jet-abrasive treatment with Al₂O₃ corundum particles of 80-100 microns in size at a pressure of 0.7-0.8 MPa at a distance from the nozzle to the treated surface of 250-350 mm, degreasing, chemical etching of the surface of the part and subsequent heating of the surface of the part with high frequency currents up to 300-400°C, and after coating, a hardening treatment is carried out with subsequent annealing.

EFFECT: increase in resistance to abrasive, waterjet and cavitation wear, resistance to fatigue cracking of the coating at operating temperatures below 273 K.

1 cl, 16 ex, 1 tbl