Method for improving performance of thermal compression or thermal deformation radiation orientation neodymium iron boron permanent magnet ring and axial uniformity thereof
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A radiation orientation, permanent magnet ring technology, applied in the manufacture of inductors/transformers/magnets, magnetic materials, magnetic objects, etc., can solve problems such as grain growth, reduce loss, improve performance and uniformity, and save costs. Effect
Active Publication Date: 2013-05-29
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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In this research work, the magnetic properties at the top of the magnetic ring still maintain the isotropy of the hot-pressed magnet, and as the position moves down, a strong texture gradually appears, but because the position near the bottom is at high temperature for a long time, Abnormal grain growth
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Embodiment 1
[0021] 17g of commercial MQU-F quick-quenching magnetic powder is put into a hot pressing mold with an inner diameter of 13mm.
[0022] Put the heat press mold into the vacuum induction heat press and evacuate to 6×10 -2 Below Pa.
[0023] Wait until the vacuum reaches 6×10 -2 At Pa, turn on the induction heating system, and turn on the hydraulic system at the same time, adjust the pressure acting on the mold to 200MPa, and raise the temperature from room temperature to 670°C at a constant speed for 5 minutes, and keep the pressure at 670°C for 1 minute.
[0024] After the heat preservation and pressure holding are completed, quickly turn off the heating system and hydraulic system, adjust the pressure to the minimum, and cool down to room temperature within 30 minutes, take out the mold and demould it.
[0025] Put the hot-pressed magnet prepared above into a mold with an inner diameter of 19.5mm and put the mold into a vacuum induction hot press, and vacuumize it to 6×10 ...
Embodiment 2
[0038] Put 27g of commercial MQU-F quick-quenching magnetic powder into a hot pressing mold with an inner diameter of 19mm.
[0039] Put the heat press mold into the vacuum induction heat press and evacuate to 6×10 -2 Below Pa.
[0040] Wait until the vacuum reaches 6×10 -2 At Pa, turn on the induction heating system, and turn on the hydraulic system at the same time, adjust the pressure acting on the mold to 200MPa, and raise the temperature from room temperature to 670°C at a constant speed for 5 minutes, and keep the pressure at 670°C for 1 minute.
[0041] After the heat preservation and pressure holding are completed, quickly turn off the heating system and hydraulic system, adjust the pressure to the minimum, and cool down to room temperature within 30 minutes, take out the mold and demould it.
[0042] Cut the hot-pressed magnets prepared above into 15.5mm hot-pressed magnets, put them into a mold with an inner diameter of 19.5mm, put the mold into a vacuum induction ...
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Abstract
The invention relates to a method for improving the performance of thermal compression or thermal deformation radiation orientation neodymium iron boron permanent magnet ring and the axial uniformity of the thermal compression or thermal deformation radiation orientation neodymium iron boron permanent magnet ring. The method for improving the performance of the thermal compression or thermal deformation radiation orientation neodymium iron boron permanent magnet ring comprises the following steps: (1) conducting thermal compression on rapid quenching magnetic powder which has a nanocrystalline structure or high density digital recording (HDDR) magnetic powder in a vacuum inductive thermal compressor to form an isotropous magnetic body by utilization of a thermal compression technology; (2) conducting thermal deformation on the isotropous magnetic body through cutting or replacement of a series of molds with different internal diameters to obtain an anisotropy magnetic body with different predeformation amounts; and (3) preparing the above predeformation anisotropyv magnetic body through a back extrusion technology to form a radiation orientation permanent magnet ring; by means of the predeformation technology, blank of the prepared radiation orientation magnet ring is enabled to have a certain degree of orientation and texture. In the process of preparation of the radiation orientation ring, the radiation orientation is benefited to be formed, thus under the condition that coercive force is not significantly reduced, the performance and the uniformity of the radiation orientation magnet ring are improved, the ratio of briquetting of the magnet ring can be greatly improved in the process of preparation of the magnet ring, energy consumption is reduced, and cost is saved.
Description
technical field [0001] The invention relates to the field of rare earth permanent magnet materials, in particular to a method for improving the performance and axial uniformity of a hot-pressed / thermally deformed radiation-oriented NdFeB permanent magnet ring by using a pre-deformation process. Background technique [0002] Radiation-oriented NdFeB magnetic rings have been applied in motors, such as voice coil motors, brushless motors and so on. These magnets are currently mainly obtained in two ways, one is the traditional powder metallurgy method, and the other is the hot extrusion method. [0003] Due to the good plastic deformation ability of single-phase rare earth permanent magnet materials at high temperatures, the preparation of nanocrystalline radiation orientation rings without cracks and high radiation orientation has become an important application direction of nanocrystalline rare earth permanent magnet materials. Sintered permanent magnet radiation orientation...
Claims
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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02H01F7/02H01F1/057B22F3/20
Inventor 唐旭陈仁杰尹文宗林旻李东闫阿儒
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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