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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

Inactive Publication Date: 2010-05-19
上海三环磁性材料有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a bonded NdFePPM magnet and its manufacturing method, which solves the technical problem of poor dynamic balance performance of the bonded NdFePB magnets in the prior art

Method used

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  • Boned neodymium iron boron permanent magnet and manufacturing method thereof
  • Boned neodymium iron boron permanent magnet and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037]100 mesh MQP-B magnetic powder 10kg, D.E.R.663U epoxy resin 100g, HT2844 dicyandiamide curing agent 3.5g, zinc stearate 3g, nano alumina 5g, KH-550 coupling agent 0.15g. Mix the thermosetting resin, curing agent, and acetone whose weight is 1 to 4 times the weight of the resin; then add the nano-alumina powder treated with the silane coupling agent KH-550 into the mixed suspension of epoxy resin-curing agent-acetone In the turbid liquid; use a high-power ultrasonic generator to disperse the nano-alumina powder, and then dry it; use a large mixer to mix the dried resin and magnetic powder mixed with the nano-alumina powder; finally add a lubricant and mix well , to obtain the magnetic powder mixture of the present invention. Use a briquette forming machine to make a cylindrical briquette with a diameter of 10 units and a height of 8 units (φ10*8), and measure the magnetic properties of the briquette with an HT610 magnetic measuring instrument; use a S-20A 20T press at 13t...

Embodiment 2

[0039] 100-mesh MQP-B magnetic powder 10kg, D.E.R.663U epoxy resin 100g, HT2844 dicyandiamide curing agent 3.5g, zinc stearate 3g, nano-alumina 20g, KH-550 coupling agent 0.6g. The preparation method and various performance test methods of the bonded NdFeB permanent magnet are the same as in Example 1.

Embodiment 3

[0041] 100 mesh MQP-B magnetic powder 10kg, D.E.R.663U epoxy resin 100g, HT2844 dicyandiamide curing agent 3.5g, zinc stearate 3g, nano alumina 30g, KH-550 coupling agent 0.9g. The preparation method and various performance test methods of the bonded NdFeB permanent magnet are the same as in Example 1.

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F1/08H01F7/02H01F41/02B22F1/00B22F3/02B22F1/054
CPCB22F1/054
Inventor 卢冯昕郭晓燕李纲饶晓雷陈巍强
Owner 上海三环磁性材料有限公司
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