Preparation method of sintering rare earth permanent magnet and rotary HDDR furnace
A rare-earth permanent magnet and rotary technology, which is applied in the direction of drum furnace, magnetic object, inductor/transformer/magnet manufacturing, etc., can solve the problems of harsh conditions, thickness error, easy deformation and adhesion, etc., to save time and reduce cost, ease of handling
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[0035] A kind of preparation method of sintered rare earth permanent magnet is as follows:
[0036] Preparation of rare earth permanent magnet alloy:
[0037] with R 2 Fe 14 B is the basic component, that is, the weight ratio of R accounts for 27-31% by weight, the content of B is 1.1-1.25%, and the rest is Fe. Perform rapid solidification melting to obtain a master alloy of 0.2-0.5mm. R can be a single element or a combination of Nd, Pr, Dy, Tb, Ce, La, Gd, Ho, preferably light rare earth. Go can also replace part of Fe (1%-10%). The smelted master alloy has unavoidable impurities and a small amount of secondary phases between the main phases.
[0038] For the HDDR treatment of rare earth permanent magnet alloys, first vacuumize to 0.1Pa, maintain the partial pressure of hydrogen at 0.010MPa, and at the same time raise the temperature to 650°C-820°C for 2-5 hours. Then increase the partial pressure to 0.05MPa for 0.5-1 hour. Then increase the partial pressure to 0.096M...
Embodiment 1
47.35
0.97
[0060] Vacuum smelting according to the formula, quick-setting and throwing alloy flakes with a thickness of 0.3-0.5mm.
[0061] In order to ensure the performance, the surface of the alloy sheet is required to have no oxide layer, and the output of the quick-setting furnace is required to be in a sealed barrel. When joining the HDDR furnace, it should also be strictly protected from contact with air.
[0062] Start the vacuum pump, the vacuum degree reaches 0.1Pa, the temperature gradually rises to 820°C, and the hydrogen partial pressure is kept at 0.01Mpa for hydrogen absorption treatment for 4 hours; the pressure rises to 0.05Mpa; 0.5 hours; the hydrogen partial pressure rises to 0.096Mpa; 1 hour; then Turn off the hydrogen source, recrystallize for 4 hours, turn on the electric furnace, fill it with argon gas to a pressure of 0.16MPa, cool naturally for 30 minutes, raise the water tank to the position of the furnace, and cool with water for 150 minut...
Embodiment 2
[0065]
[0066] Vacuum smelting of rare earth permanent magnet alloys to obtain quick-setting 0.3-0.4mm thin strips.
[0067] Put it in the HDDR furnace in a sealed state, and the treatment process is the same as in Embodiment 1. Put this powder in a sealed barrel, add 0.2% antioxidant and mix evenly, airflow mill to an average particle size of 3 microns, form in a magnetic field in a low-oxygen environment of 500ppm, and perform conventional vacuum sintering and tempering to obtain the properties of N30 .
[0068]
[0069] According to this idea, according to the performance requirements of the required permanent magnets, magnetic properties, temperature requirements, anti-corrosion requirements, mechanical properties and other requirements, a reasonable composition design and process design are carried out to achieve the lowest cost under the premise of meeting the use requirements. In particular, reduce the use of scarce materials such as dysprosium and...
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