1) The material consists of samarium, cobalt, iron, copper, zirconium and a heavy rare earth element distributed by mass percentage as the material. Samarium 23 25.5%, Cobalt 44 50%, iron 14 20%, copper 3 8%, zirconium 2 4%, heavy rare earth elements 0.5%.
2) The alloy dissolved and modulated material was dissolved in a vacuum medium frequency induction furnace. After the dissolution, it was continued to hold heat and refine at 1430(1450c) for 5 minutes, and then injected into the mold to obtain samarium cobalt alloy. Water - cooled copper mold is generally preferred.
3) Magnetic powder manufacturing The samarium cobalt alloy was crushed by hydrogen and ball mill to obtain magnetic powder with a particle size of 3.0.5 m. Hydrogen crushing means that, after passing hydrogen in a reaction vessel containing samarium cobalt alloy, the pressure of hydrogen gas reaches IMPa, the temperature rises to 150C, and the temperature is held for 20h, so that samarium cobalt alloy and hydrogen can undergo hydrogen-storage reaction and become saturated. After the response is completed, the temperature is improved to 300~400. The swimming pool is insulated, so that the response product is completely dehydrogenated. In this process, the samarium cobalt alloy breaks along the grain boundary, and the magnet reaches the purpose of pulverization under conditions that ensure crystal integrity.
4) Orient and shape magnetic powder under 1.8)2.ot magnetic field, after pressing forming, cold isobaric at 200(300mi) pressure to obtain the top samarium cobalt billet.
5) Sintering solid solution in the sintering furnace, under the maintenance of inert gas argon, unbalanced sintering of the top samarium cobalt temporarily sintered body, the whole sintering at 10501180 temporarily sintered for 20 30Min, the second time at 12001210 sintering 90 lOOMin, The unbalanced sintering method of solid solution 90 lOOMin at 11681190 in the third time period refers to real-time monitoring of the heating pairs of multiple blocks in the sintering furnace, and real-time conditioning of heating power according to the temperature of the heating pairs, so as to make the temperature of multiple blocks the same.
6) After aging treatment, the second samarium cobalt grey is kept at 835(7 below 845c) h, and then cooled to 400C at the rate of 0.5) 0.6/ min. After being kept at 3 plutonium, the samarium cobalt magnet is air-cooled to room temperature. Compared with the previous formula, the formula of the erbium element is cooperated in the invention, and the microarrangement of samarium cobalt alloy is cellular structure. The coercivity of the alloy comes from the pinning of the domain walls in the cellular arrangement. Grain boundary precipitates also have a pinning effect in the domain walls. The addition of erbium leads to the addition of grain boundary precipitates. The zirconium content of the invention is 2 4%, higher than the 1 3% content in the usual formulation. Zirconium promotes the formation of the 2:17 phase of the sheet, and the addition of the sheet phase is beneficial to the improvement of coercivity.
Through the addition of erbium and the reasonable proportion of formula, the inherent coercivity Hcj of the prepared samarium cobalt magnet data reaches 27 ~ koe, which is much higher than the existing formula's coercivity of about 20K0e, which meets the high coercivity requirement of samarium cobalt magnet data in high-tech field. In the manufacturing method of samarium cobalt permanent magnet material of the invention, samarium cobalt alloy ingot is pulverized by hydrogen crushing process, and unbalanced sintering method is used to make the sintering temperature of each temperature zone in the sintering furnace the same, so as to form a more uniform microstructure, which also improves coercivity to a certain extent. The invention ages samarium cobalt billet with a cooling rate lower than that of the prior art. By slowing down the cooling rate, the samarium cobalt alloys are fully dissolved into each other, so that the micro-arrangement is more uniform and the size is reduced for the purpose of improving coercivity and avoiding adverse magnetic field and other demagnetization from the outside.
