METHOD FOR OBTAINING A WEAR-RESISTANT COATING FROM A HIGH-ENTROPY ALLOY WITH A SURFACE-CARBONIZED LAYER Russian patent published in 2022 - IPC C23C28/02 B23K26/342 B23K26/144 C23C4/08 C23C4/12 B22F9/02 C22C30/00 

FIELD: protective coatings.

SUBSTANCE: invention relates to a method for obtaining a wear-resistant coating from a high-entropy alloy with a surface-carbonized layer and can be used to create a protective coating and repair worn parts. At least 5 elements are taken from Cr, Mo, Nb, W, V, Co, Fe, Mn, Ni with a purity of 99.5% in the ratio of 5-35% of each element, mixed in a vacuum box with argon purging and placed in an attritor. The ratio of the mass of the initial powder mixture to the mass of the balls is 1:10-1:40. Mechanical alloying is carried out for 5-25 hours at 150-350 rpm. After that, the obtained chemically homogeneous powders are sieved, fractions of 20-60 microns, 60-100 microns, 100-150 microns are separated and low-temperature plasma spheroidization is carried out in an argon-hydrogen mixture. The spheroidized fraction of 60-120 microns is isolated from the powder mass and sent to an air classifier to remove the smallest fraction. The powder is deposited onto the substrate by direct laser cultivation in an atmosphere of protective argon. After applying the material to the substrate, the part is placed in a charcoal carburetor and cementation is carried out.

EFFECT: resulting coating with a surface-carbonized layer of a high-entropy alloy has a porosity of less than 1% with a maximum pore size of 2 microns, a hardness of more than 800 HV, high wear resistance, which makes it possible to operate surfaced parts in conditions of increased wear.

1 cl, 1 ex