Boned neodymium iron boron permanent magnet and manufacturing method thereof

A permanent magnet, NdFeB technology, applied in the field of rare earth permanent magnets and their manufacturing, can solve problems such as poor dynamic balance performance of bonded NdFeB magnets, and achieve improved unbalanced performance, high stability, and improved density uniformity. sexual effect
CN101710518AInactive Publication Date: 2010-05-19上海三环磁性材料有限公司 +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
上海三环磁性材料有限公司
Publication Date
2010-05-19
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a boned neodymium iron boron permanent magnet and a manufacturing method thereof. The permanent magnet comprises NdFeB magnetic powder, thermosetting resin, a firming agent, a lubricant and a coupling agent, and also comprises nano-alumina powder of which the weight is 0.01 to 1 percent of that of the magnetic powder. The method comprises the following steps: uniformly mixing the thermosetting resin, the firming agent and acetone of which the weight is 1 to 4 times that of the resin; then performing surface treatment on the nano-alumina powder by utilizing the silane coupling agent KH-550; dispersing the nano-alumina powder by utilizing a high-power ultrasonic generator and drying the dispersed powder; mixing the thermosetting resin mixed with the nano-alumina powder after the drying with the magnetic powder uniformly by utilizing a large-scale mixer, and finally, adding the lubricant into the mixture for uniform mixing; and making the mixture into a green blank by a compression molding machine, and curing the green blank for 15 to 60 minutes at a temperature of between 150 and 220 DEG C to form a magnet. The boned neodymium iron boron permanent magnet improves the unbalanced performance of the magnet, ensures that the magnet has high stability and small vibration in a driver during high-speed rotation and better meets the technical requirements.
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Description

technical field

[0001] The invention relates to a rare earth permanent magnet and a manufacturing method thereof, in particular to a bonded NdFeB permanent magnet with high dynamic balance performance and a manufacturing method thereof. Background technique

[0002] Bonded NdFeB permanent magnets have excellent magnetic properties and small dimensional tolerances, and are widely used in computer hard drives, optical drives, game consoles, printers, automotive micro-motors, and magnetic sensors. The preparation method is generally as follows: NdFeB permanent magnet powder and bonding resin are mixed according to a certain ratio, and then the mixed magnetic powder is pressed into shape according to a certain processing method, and then solidified, ground and coated. Finally, it becomes a magnet of a certain shape, and its main components include NdFeB magnetic powder that provides magnetic properties, thermosetting resin as a binder, and processing aids such as curing agent, a...

Claims

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