Agglutinate neodymium-iron-boron magnet and preparation method thereof

A neodymium iron boron and magnet technology, used in magnetic objects, inductance/transformer/magnet manufacturing, magnetic materials, etc., can solve problems such as mechanical performance degradation, process and product performance defects, and achieve good mold release and dimensional precision. , the effect of favorable mechanical strength

Inactive Publication Date: 2008-12-17
MAGNEQUENCH (TIANJIN) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In Japanese Patent Application No. 2000-036403, in order to avoid the deterioration of mechanical properties caused by metal soaps and amino acid lubricants, fluororesins are proposed for replacement lubricants, and do not melt when the green body is subjected to heat curing treatment, so It has the advantage of preventing the deterioration of the mechanical strength of the obtained product, but there are defects in the process and product performance

Method used

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  • Agglutinate neodymium-iron-boron magnet and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Weigh 10,000g of MQP-B 80mesh magnetic powder, 100g of EPON 840 bisphenol A epoxy resin (epoxy equivalent EEW=330-380), 3.662g of dicyandiamide, 3-(3,3-dichlorophenyl)-1 , 1-dimethylurea 1.831g, Wacker H 20 Silica 20g, acetone 1000g, the above components are prepared into a resin solution, mixed in a planetary mixer for 15 minutes under a nitrogen atmosphere, dried in a blast oven at 55 degrees Celsius for 120 minutes, and the acetone is removed to obtain a magnetic powder containing nano-silica - resin mixture. Utilize the Lakeshore 7312VSM (Vibrating Sample Magnetometer) tester to test the magnetic properties of the obtained magnetic powder-resin mixture; utilize the YA-20 type electro-hydraulic pressure testing machine to investigate the release force of the obtained magnetic powder-resin mixture; utilize Gasbarre 15T press at 14ton / cm 2 Press under pressure to form a ring-shaped magnet green body with an outer diameter of 20.80 mm and an inner diameter of 18.60 m...

Embodiment 2

[0014] Weigh MQP-B 80mesh magnetic powder 10,000g, EPON 840 bisphenol A epoxy resin (EEW=330-380) 100g, dicyandiamide 3.662g, 3-(3,3-dichlorophenyl)-1,1 -Dimethylurea 1.831g, Wacker H 20 Silicon dioxide 10g, tetrahydrofuran 1000g, the above components are prepared into a resin solution, mixed with a planetary mixer for 15 minutes under a nitrogen environment, and dried at 65 degrees Celsius for 120 minutes in a blast oven to remove tetrahydrofuran to obtain nano-silica reinforced Magnetic powder-resin mixture. Utilize the Lakeshore7312VSM (Vibrating Sample Magnetometer) tester to test the magnetic properties of the obtained magnetic powder-resin mixture; utilize the YA-20 type electro-hydraulic pressure testing machine to investigate the release force of the obtained magnetic powder-resin mixture; utilize Gasbarre 15T press at 14ton / cm 2 Press under pressure to form a ring-shaped magnet green body with an outer diameter of 20.80 mm and an inner diameter of 18.60 mm; cure at a...

Embodiment 3

[0016] Weigh 10,000g of MQP-B 80mesh magnetic powder, 100g of EPON 840 bisphenol A epoxy resin (EEW=330-380), 3.662g of dicyandiamide, 3-(3,3-dichlorophenyl)-1,1- Dimethylurea 1.831g, Wacker H 20 Silica 3g, acetone: tetrahydrofuran = 1: 1wt% mixed solution 1000g, above-mentioned components are prepared resin solution, utilize planetary mixer to mix 15 minutes under nitrogen environment, utilize blast oven to dry 120 minutes under the condition of 60 degrees centigrade, remove Solvent to obtain nano-silica reinforced magnetic powder-resin mixture. Utilize the Lakeshore 7312VSM (Vibrating Sample Magnetometer) tester to test the magnetic properties of the obtained magnetic powder-resin mixture; utilize the YA-20 type electro-hydraulic pressure testing machine to investigate the release force of the obtained magnetic powder-resin mixture; utilize Gasbarre 15T press at 14ton / cm 2 Press under pressure to form a ring-shaped magnet green body with an outer diameter of 20.80 mm and ...

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Abstract

The invention relates to a Nd-Fe-B bonded magnet, which comprises Nd-Fe-B magnetic powder, thermosetting resin, a curing agent, an accelerant and a lubricant, and is characterized in that nano silicon dioxide is added to the Nd-Fe-B bonded magnet as a reinforcing agent, the content of the added weight is 0.01 to 1.0 percent of the weight of the magnetic powder, the thermosetting resin, the curing agent, the accelerant, the nano silicon dioxide, the lubricant and an organic solvent are intensively mixed, the intensively mixed resin solution and the magnetic powder are intensively mixed under the protection of the inert gas, the solvent is removed by heating and pressure reducing to obtain the magnetic powder-resin mixture containing the nano silicon dioxide, and the Nd-Fe-B bonded magnet can be achieved through pressing and thermosetting processing. The Nd-Fe-B bonded magnet has advantageous mechanical strength, and also has good magnetic property, mold unloading property and dimension precision.

Description

technical field [0001] The invention relates to the field of neodymium-iron-boron magnets, in particular to a bonded neodymium-iron-boron magnet and a preparation method thereof. Background technique [0002] Bonded NdFeB magnets have excellent magnetic properties. They are mixtures of NdFeB magnetic powder and bonding resin, which are pressurized and formed into the desired magnet shape. Its main components include NdFeB magnetic powders that provide magnetic properties, thermosetting resins as binders, and functional additives such as curing agents, accelerators, coupling agents, and lubricants. Among them, the strength of the magnet is mainly derived from the resin base as the binder, but the mixture containing only the magnetic powder and the thermosetting resin generally cannot obtain good formability. Therefore, in Japanese patent application H11-045816, the application such as stearin Metal soaps of calcium stearate and zinc stearate are used as lubricants to increas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F1/08H01F41/02C08L63/00C08K5/3445C08K3/38C08K3/36
Inventor 顾鸣岐周永昌
Owner MAGNEQUENCH (TIANJIN) CO LTD
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