Degassing method for producing sintered neodymium-iron-boron
A NdFeB, degassing technology, applied in the direction of electrical components, magnetic materials, circuits, etc., can solve the problem of high probability of crack formation in magnets, achieve the effect of reducing the proportion of micro cracks, good magnetic properties, and improving the pass rate
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[0020] The preparation method of the NdFeB magnet is as follows:
[0021] Ingredients: The raw materials are mixed according to the alloy composition ratio, and the alloy quick-setting flakes are prepared by the quick-setting flake process. Micropowder with a particle size of 5.5-7μm; press molding: put the prepared micropowder into a sealed press with a nitrogen protective atmosphere to press, with an orientation magnetic field of ≥1.8T; then perform isostatic pressing at a pressure of 210MPa, isostatic pressing The holding time is 20 minutes.
Embodiment 1
[0023] After the hydrogen explosion process, the micropowder with a hydrogen content of 2500-2800ppm is measured, and after jet milling, 50 square magnets with a weight of 800g are pressed, and the blank is put into the sintering furnace, and the sintering furnace is vacuumed to 10 -1 After Pa, raise the temperature to 300°C for 1 hour for first-stage degassing, and the heating rate is controlled at 7°C / min; set the second-stage degassing into two stages, the first stage is a constant temperature degassing section, and the temperature is raised after the first-stage degassing Keep warm at 600°C for 1 hour, and control the heating rate at 5°C / min; the second stage is the heating and degassing stage. After the first stage, continue to heat up to 780°C for 0.5h, and control the heating rate at 0.6°C / min. Keep the vacuum at 0.1-10Pa throughout the degassing process. Continue vacuuming after degassing, raise the temperature to the sintering temperature of 1065°C, and keep the tempe...
Embodiment 2
[0026] After the hydrogen explosion process, the micropowder with a hydrogen content of 2500-2800ppm is measured, and after jet milling, 50 square magnets with a weight of 1000g are pressed, and the blank is put into the sintering furnace, and the sintering furnace is vacuumed to 10 -1 After Pa, raise the temperature to 400°C for 1 hour for first-stage degassing, and control the heating rate at 5°C / min; set the second-stage degassing into two stages, the first stage is a constant temperature degassing section, and then heat up after the first-stage degassing Keep warm at 700°C for 1 hour, and control the heating rate at 4°C / min; the second stage is the heating and degassing stage. After the first stage, continue to heat up to 850°C for 0.5h, and control the heating rate at 0.4°C / min. Keep the vacuum at 0.1-10Pa throughout the degassing process. Continue vacuuming after degassing, raise the temperature to the sintering temperature of 1065°C, and keep the temperature for 3.5 hou...
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