Composite magnet manufacturing method using neodymium iron boron magnetic sheets

A composite magnet, NdFeB technology, applied in the manufacture of inductors/transformers/magnets, magnetic objects, magnetic materials, etc., can solve the problems of increasing production costs, increasing the amount of heavy rare earth elements, etc., to reduce the amount of use and meet the mechanical properties. requirements, the effect of high production efficiency

Active Publication Date: 2014-06-04
FUJIAN CHANGJIANG GOLDEN DRAGON RARE EARTH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, if the highest coercive force (Hcj) requirement is used as the standard to produce the whole magnet,

Method used

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  • Composite magnet manufacturing method using neodymium iron boron magnetic sheets
  • Composite magnet manufacturing method using neodymium iron boron magnetic sheets
  • Composite magnet manufacturing method using neodymium iron boron magnetic sheets

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Refer to the attached figure 1 The method for manufacturing a composite magnet with NdFeB magnetic sheets of the present invention is illustrated.

[0027] 1) Prepare the magnetic sheet of the R-T-B series rare earth sintered magnet.

[0028] In the present invention, the preparation of the magnetic sheet does not limit the formula and sintering process of the R-T-B series rare earth sintered magnet, and the following is only a general description. The process includes: melting and casting-crushing-orientation forming-sintering-machining.

[0029] The corresponding raw materials are prepared in the formula of a certain R-T-B series rare earth sintered magnet. The raw materials are put into the smelting furnace and smelted into molten materials. The molten material is cast into a cast sheet with a specified average thickness, and the casting method can be strip casting or centrifugal casting. The casting sheet is crushed into alloy powder with a specified particle siz...

Embodiment 2

[0050] Prepare the thickness W by the aforementioned method 1 , brand 48H magnetic sheet (its Br is 14.08kGs, Hcj is 17.42kOe, (BH)max is 48.48MGOe), and the thickness is W 2 , Brand 42SH magnetic sheet (its Br is 12.72kGs, Hcj is 26.35kOe, (BH)max is 40.32MGOe), the goal is to manufacture a thickness of W 3 composite magnets. Refer to attached figure 2 As shown, the surface treatment of the magnetic sheet is carried out, and the steps are the same as those described in Embodiment 1, and will not be repeated here. At this time, the thickness of the magnetic sheet of grade 48H is reduced to W 1 ′, the thickness of the magnetic sheet of grade 42SH is reduced to W 2 '. According to the formula N 1 ×a 1 W 1 '=N 2 ×a 2 W 2 '≥W 3 (a 1 and a 2 is the coefficient of variation of the thickness of the magnetic sheet before and after bonding, mainly affected by the heat treatment temperature, usually in the range of 0.98 to 1.02), determine N 1 and N 2 value (rounded), t...

Embodiment 3

[0055] Prepare the magnetic sheet of brand 50N (its Br is 14.43kGs, Hcj is 12.26kOe, (BH)max is 49.12MGOe), the magnetic sheet of brand 48H (its Br is 14.08kGs, Hcj is 17.42kOe, (BH) max is 48.48MGOe) and the magnetic sheet of brand 42SH (its Br is 12.72kGs, Hcj is 26.35kOe, (BH)max is 40.32MGOe). The combination of the above-mentioned magnetic sheets is fixed under pressure and subjected to heat treatment, so that a thermocompression bonding process occurs between the magnetic sheets and finally combined into a composite magnet. Afterwards, the composite magnet is post-processed to meet the specified size requirements, and finally its performance is tested. Among them, it is assumed that the coefficient of variation of the thickness of the magnetic sheet is 1.0, and the specific scheme is:

[0056] Prepare 40.0mm (length) × 10.0mm (width) × 10.2mm (thickness), the brand is 50N magnetic sheet, 20.1mm (length) × 10.0mm (width) × 10.1mm (thickness), the brand is 48H Magnetic s...

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Abstract

The invention provides a composite magnet manufacturing method using neodymium iron boron magnetic sheets. The method includes combining a plurality of magnetic sheets with surface roughness Ra less than 10.0 micrometer; allowing the magnetic sheets to contact with each other by self-weight and/or pressurization; performing heat treatment on the combined magnetic sheets at the temperature of 600 to 1100 DEG C for 1.0 to 24.0 h. The pressure of the contacting faces of the magnetic sheets ranges from 0.002 kg/cm2 to 100.0 kg/cm2. According to the method, the magnetic sheets serve as basic units, and the magnetic sheets are combined to form a composite magnet by hot pressing and adhering. The method has the advantages that the composite magnet with optional thickness made of neodymium iron boron magnetic sheets produced by a grain boundary diffusion process; producing efficiency of production process is high; usage of heavy rare earth elements is reduced, and cost is reduced effectively; the produced composite magnet has high magnetic property or special magnetic property and can meet mechanical property requirements of industrial application.

Description

technical field [0001] The invention relates to the field of rare earth permanent magnets, in particular to a method for manufacturing composite magnets with neodymium-iron-boron magnetic sheets. Background technique [0002] R-T-B rare earth sintered magnets are known to have the highest performance among permanent magnets, and are used in voice coil motors (VCM) for hard disk drives and electric motors for hybrid vehicles. When an R-T-B-based rare earth sintered magnet is used in a motor, it is required to have excellent heat resistance and high coercive force characteristics in order to be used in a high-temperature environment. [0003] As a method to increase the coercive force of R-T-B rare earth sintered magnets, a common method is to add heavy rare earth element RH during smelting. According to this method, R containing the light rare earth element RL as the rare earth element R 2 T 14 The rare earth element R in phase B can be replaced by the heavy rare earth ele...

Claims

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Application Information

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IPC IPC(8): H01F41/02H01F1/057
Inventor 张炜永田浩
Owner FUJIAN CHANGJIANG GOLDEN DRAGON RARE EARTH CO LTD
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