SU1691406A1 - Method of heat treatment of permanent magnets - Google Patents

Abstract

The invention relates to metallurgy, in particular to the technology of heat treatment of permanent magnets from UNDK alloys. The purpose of the invention is to reduce the rejection of magnets in cracks. The method includes heating to 850-900 ° C, holding, heating to 1260-1300 ° C. exposure, cooling to 980–900 ° C, cooling in a magnetic field to -700-500 ° C, accumulation of magnets in a thermostat with a temperature of 500-550 ° C, cooling together with a thermostat to 20 ° 75 ° C , tempering and cooling to shop temperatures, while cooling with a thermostat, heating during tempering and cooling after tempering to shop temperatures is carried out at a rate of 60-100 ° C / h. 1 tab.

Description

The invention relates to metallurgy, in particular, to the technology of heat treatment of permanent magnets of complex configuration from cast alloys of the UNDK, used in instrument making, electronic engineering, electrical engineering and radio engineering.

The purpose of the invention is to reduce the rejection of magnets of complex configuration from UNDK cracked alloys.

According to the method of heat treatment of permanent magnets, including heating up to 850-900 ° С, holding, heating up to 1260-1300 ° С, holding, pressing up to 980-900 ° С, cooling in a magnetic field up to 700-500 ° С, accumulation of magnets , cooling, tempering and cooling the magnets to shop temperatures, the accumulation of the magnets is carried out in a thermostat with a temperature

500-550 ° C, and cooling after accumulation is carried out with a thermostat to 20-100 ° C, while cooling with a thermostat, heating during tempering and cooling after tempering to shop temperatures is carried out at a rate of 60-100 ° C / h.

For experimental verification, thin-walled four-pole stator magnets with clearly expressed poles (magnet A) and thin-walled four-pole rotor magnets with clearly expressed poles (magnet B) are thermally processed. Magnets cast from alloy UNDK 24, containing, wt.%: AI 8; Ni 13.5; Sp 3; From 24; TI 0.3; S 0,2; the rest of Fe. Simultaneously with the magnets, the witness specimens are cast and then thermally treated to control the magnetic parameters of the alloy. In a magnetic field, the magnets are cooled in four

J

ABOUT

rechpolyusnyh, and samples - in bipolar electromagnets.

The table shows the used heat treatment modes for the known and proposed methods, as well as the results of screening.

The proposed method, in comparison with the known, allows reducing the rejects by 5.8-8 times.

Claims (1)

The invention The method of heat treatment of permanent magnets from UNDK alloys, including heating up to 850-900 ° C, holding, heating to 1260-1300 ° С, shutter speed, sub-positioning up to 980-900 ° С, cooling in a magnetic field up to 700-500 ° С, accumulation of magnets, cooling, tempering and cooling magnets to room temperature, about the fact that, in order to reduce the rejection of magnets in cracks, the accumulation of magnets is carried out in a thermostat with a temperature of 500-550 ° C, cooling after accumulations are carried out up to 20-100 ° C, while cooling to 20-100 ° C, heating during tempering and cooling after tempering to room temperature is carried out at a speed of 60-100 ° C / h. Reject rate of permanent MAGNETS of complex configuration from UNDK 24 alloy after different heat treatment conditions Known method Annealing of 850 ° C 30 mnn, annealing of 1300 ° C 40 min, boiling-ing at a speed of 150–200 (; / min to 900 ° C, cooling in a magnetic field to LOO ° C at a speed of 30 ° C / min | cooling to room temperature air, heating up to 620 ° C at a rate of 24 ° C / h, tempering at 620 ° C for 2 hours and 560 ° C for 16 hours, cooling to room temperature in air. The proposed method Annealing at 850 ° C for 30 minutes, annealing for 40 minutes, pressing at a speed of 15P-20Ors / min to 900 ° C, cooling in a magnetic field at a speed of 30 ° C / min to 7OO ° C, accumulation of magnets in a thermostat with a temperature of 50 (-50gCt cooling with a thermostat up to 20 ° С at a rate of 100 ° С / h, heating up to 620 ° С at a speed of 60 ° С / h, about 620 ° С for 2 hours, 560 ° С 1oh, cooling to room temperatures with a speed Annealing at 900 ° C for 30 minutes, annealing at 12faO ° C for 40 minutes, stringing at a speed of 150–200 C / min to 980 ° C, cooling in a magnetic field at a rate of 30 ° C / min to 600 ° C, accumulation of magnets in thermostat with temperature, cooling with thermostat up to 10t) C at a rate of 60 ° C / h, heated to 620 ° C at a rate of 100 ° C / h, tempering, 2 hours and hp ° C for 16 h, cooling to room temperatures at a speed of 60 ° C / h Annealing at 850 ° C for 30 minutes, annealing at 12 ° 0 ° C for 40 minutes, cooling at ISO-ZOO; / min to 950 ° C, cooling in a magnetic field at a speed of 30 ° C / min to 500 ° C, accumulation of magnets in a thermostat with a temperature of 500-550 ° СР cooling with a thermostat up to 50 ° С at a rate of 80 ° С / h, heating up to 620 ° С at a rate of 70 ° С / h, tempering 620 ° С 2 h and Ь60 ° С 1Ь h, cooling to room temperature at a rate of 80 ° C / h Annealing at 850 ° C for 30 min, annealing at 17.80 ° C for 40 min, suitable for annealing at a rate of 1N200 C / nin to 950 ° C, cooling in a magnetic field at a speed of 30 ° C / μm until the accumulation of magnets in the thermostat , cooling with a thermostat to a speed of 250 ° C / h, heating to 62 ° C at a speed, tempering 620 ° C for 2 h and 16 h, cooling to room temperature at a speed of Annealing min, annealing of AO min, cooling at a speed of 150 -200 ° C / min to 950 ° C, cooling in magnetic POLO with a speed of EO ° C / min to 600 ° C, the accumulation of magnets in a thermostat at a rate of atura LOO ° C, cooling with a thermostat up to 20 ° C at a rate of 40 ° C / h; heating up to a speed of 50 ° C / h; tempering 620 ° C for 2 h and 560 ° C for 16 h; cooling to room temperature at a speed of 30 s / h