METHOD FOR MANUFACTURING ELEMENT OF RUNNING-IN SEAL OF TURBOMACHINE Russian patent published in 2021 - IPC B22F7/04 C22C33/02 B22F3/12 F16J15/16 F01D11/08 

FIELD: mechanical engineering.

SUBSTANCE: invention relates to mechanical engineering, in particular to methods for manufacturing seals for clearances of the flow path of turbomachines operating for a long time under conditions of high temperatures and high-frequency vibrations. The seal is made in the form of a bar with side ridges, between which the running-in part of the seal is located. The powder of the first comb is poured into the mold and pressed at a specific pressure of 750-1500 kg/cm². Then the powder of the running-in part of the seal is poured into the mold to ensure contact with the surface of the workpiece of the first ridge and pressing is carried out at a specific pressure of 1500-2250 kg/cm². At the third stage, the powder of the second comb is poured into contact with the surface of the workpiece of the running-in part and pressing is carried out at a specific pressure of 6000-11000 kg/cm². The pressing is carried out in the transverse direction of the said seal. For the formation of scallops, a powder material of the composition is used, wt%: Cr 12.0-14.0, Мо 1.5-2.5, Ti 0.08, С 0.08, Si 0.10, Mg 0.20, Fe - the rest, with a particle size of 40-100 mcm. To form the running-in part of the seal, a powder material with a particle size of 20-100 mcm of the following composition, wt%: from 90 to 96 powder of the composition, wt%: Cr – from 12.0 to 14.0, Mo – from 1.5 up to 2.5, Ti – 0.08, C - 0.08, Si – 0.10, Mg – 0.20, Fe – the rest; 3.0 to 6.2 hexagonal boron nitride powder; from 0.5 to 2.0 barium sulfate; 0.5 to 1.8 zinc stearate. Sintering is carried out at a temperature of 1000 to 1100°C in an argon atmosphere, after which tempering is carried out at a temperature of 650 to 670°C for 2 to 3 hours and machining.

EFFECT: invention provides high break-in ability, mechanical strength and wear resistance at the same time.

1 cl, 5 dwg, 1 ex