Ultra-thin bonded NdFeB magnet used for computer CPU cooling fan and preparation method thereof

A cooling fan, NdFeB technology, applied in the direction of permanent magnet manufacturing, magnets, magnetic objects, etc., can solve the problems of poor temperature stability and corrosion resistance

Inactive Publication Date: 2018-04-24
麦格昆磁磁性材料(滁州)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Zhong Xichun (2015, Effect of binder on the magnetic properties of bonded NdFeB / SrF ferrite composite magnets) believes that bonded NdFeB magnets have good magnetic properties, but poor temperature stability and corrosion resistance. By improving the molding process and increasing the density of the magnet, the magnetic properties and corrosion resistance of the bonded magnet can be effectively improved

Method used

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  • Ultra-thin bonded NdFeB magnet used for computer CPU cooling fan and preparation method thereof
  • Ultra-thin bonded NdFeB magnet used for computer CPU cooling fan and preparation method thereof
  • Ultra-thin bonded NdFeB magnet used for computer CPU cooling fan and preparation method thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0063] For the preparation of ultra-thin bonded NdFeB magnets, it is realized based on the following steps:

[0064] Step 1: Preparation of permanent magnetic powder, non-magnetic powder and composite binder powder mixture:

[0065] According to the weight percentage of mixing, 58-99.5% of permanent magnetic powder, 0-41.5% of non-magnetic powder, 0.5-42% of composite binder are uniformly mixed under normal temperature and pressure to make permanent magnetic powder and non-magnetic powder. Mixture powder of magnetic powder and composite binder;

[0066] Step 2: One-time molding of ultra-thin bonded NdFeB magnets:

[0067] The prepared mixed powder is subjected to one-time compression molding at room temperature and pressure of 2-20 tons / square centimeter; then cured at 80-250°C for 5-120 minutes, and the product is cured from the inside to the outside by infrared heating The curing method is first inside and then outside to shorten the liquid phase time, thus making ultra-th...

Embodiment 1

[0075] The ultra-thin bonded NdFeB magnet provided in this example is made of bonded NdFeB, ring-shaped, and its relevant dimensions:

[0076] The outer diameter of the ring magnet: 19mm;

[0077] The inner diameter of the ring magnet: 17mm;

[0078] The height dimension of the ring magnet: 2mm;

[0079] The roundness of the outer diameter of the ring magnet: less than 0.03mm;

[0080] Coaxiality of circular magnet: less than 0.03mm;

[0081] Roundness of the inner diameter of the ring magnet: less than 0.03mm.

[0082] And the magnetic properties of the ultra-thin bonded NdFeB magnet:

[0083] Maximum energy product (BH)max: 24kJ / m 3 ;

[0084] The number of magnetic poles of the magnet is 4.

[0085] For this ultra-thin bonded NdFeB magnet, it is prepared through the following steps:

[0086] Step 1: Mix permanent magnetic powder and composite binder Preparation: Mix 62% permanent magnetic powder, 2.5% composite binder, and 35.5% non-magnetic substances uniformly at ...

Embodiment 2

[0096] The ultra-thin bonded NdFeB magnet provided in this example is made of bonded NdFeB filled with 1% SmCo magnetic powder, ring-shaped, and its relevant dimensions:

[0097] The outer diameter of the ring magnet: 11.9mm;

[0098] The inner diameter of the ring magnet: 10.1mm;

[0099] The height dimension of the ring magnet: 1.2mm;

[0100] The roundness of the outer diameter of the ring magnet: less than 0.03mm;

[0101] Coaxiality of circular magnet: less than 0.03mm;

[0102] Roundness of the inner diameter of the ring magnet: less than 0.03mm.

[0103] And the magnetic properties of the ultra-thin bonded NdFeB magnet:

[0104] Maximum energy product (BH)max: 96kJ / m 3 ;

[0105] The number of magnetic poles of the magnet is 8.

[0106] For the ultra-thin bonded NdFeB magnet, the electrophoresis method is used for its preparation, the electrophoresis condition is 60° C. for 20 minutes, and the curing condition is 180° C. for 1 hour.

[0107] The ultra-thin bonde...

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Abstract

The invention discloses an ultra-thin bonded NdFeB magnet used for a computer CPU cooling fan and a preparation method thereof. The ultra-thin bonded NdFeB magnet is in a circular-ring shape, and thesurface of the magnet is provided with a corrosion resistant layer; the ultra-thin bonded NdFeB magnet is in a circular-ring shape and formed by one step until the tolerance of a final product is lessthan 0.03 mm. The formed ultra-thin bonded NdFeB magnet is strong in corrosion resistance, a test method disclosed by the GB / T18880 is used for detecting the magnet, and according to the detection result, the magnet can be obtained. The heat and humidity resistance and solvent resistance of the ultra-thin bonded NdFeB magnet with the anti-corrosion layer are good, and the magnet is not corroded and can meet the requirements of related respects.

Description

technical field [0001] The invention relates to a magnetic device, in particular to an ultra-thin bonded NdFeB magnet. Background technique [0002] Bonded NdFeB magnets have been widely used in the field of motors due to their advantages of high cost performance, large degree of shape freedom and high dimensional accuracy. Ultra-thin computer CPU heat dissipation motor bonded NdFeB magnet is an important original device for ultra-thin computer CPU heat dissipation motor. use. [0003] Ultra-thin computer CPU heat dissipation motor bonded NdFeB magnet is one of the most critical parts of the notebook computer cooling fan, and its performance directly determines the operating quality of the cooling fan. At present, bonded NdFeB magnets for ultra-thin computer CPU cooling motors are made of bonded rare earth magnets, or bonded magnets containing rare earth elements are sintered with ferrite powder or other magnetic materials. Due to the extremely active chemical properties ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F7/02H01F41/02
CPCH01F7/0221H01F41/026H01F41/0266
Inventor 高庆国杨友文
Owner 麦格昆磁磁性材料(滁州)有限公司
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