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Manufacturing method of sintered neodymium iron boron

A manufacturing method, NdFeB technology, applied in the manufacture of inductors/transformers/magnets, permanent magnets, magnetic materials, etc., can solve the problems of high material energy consumption, low green density, and small product deformation, and achieve dimensional stability High stability, high dimensional accuracy, and less sintering deformation

Inactive Publication Date: 2020-10-02
JIANGXI KAIYUAN AUTOMATIC EQUIP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a manufacturing method of sintered NdFeB to solve the problems of low density, fear of bumping, large deformation after sintering, and large consumption of materials and energy in the prior art, so as to realize magnetic field forming green bodies High density, good strength, small deformation of the sintered product, low material and energy consumption, and achieve near-net shape

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Smelting, hydrogen crushing and jet milling were carried out by conventional techniques to obtain NdFeB alloy powder with an average particle size of 3 microns, 100 kg.

[0048] Organic coating agents include antioxidants, binders, lubricants, coupling agents and surfactants;

[0049] The antioxidant is a mixture of PVA, PEG, PVP and PC. Wherein, the amounts of PVA, PEG, PVP, and PC added are each 0.025kg.

[0050] The binder is a mixture of sodium phytate, benzotriazole octadecylamine, and BTA. Among them, sodium phytate 0.05kg, benzotriazole stearylamine salt 0.05kg, BTA 0.05kg.

[0051] The coupling agent is a phthalate, and the amount added is 0.02kg;

[0052] The surfactant is a mixture of Tween-80 and ammonium citrate. Among them, the amount of Tween-80 is 0.06kg, and the amount of ammonium citrate is 0.02kg.

[0053] The lubricant is zinc stearate, and the amount added is 0.05kg;

[0054] Dissolve the above organic matter into a mixed solvent of xylene (1.5...

Embodiment 2

[0058] And embodiment 1, identical alloy powder, 100kg.

[0059] Organic coating agents include antioxidants, binders, lubricants, coupling agents and surfactants;

[0060] Wherein the antioxidant is a mixture of PEG, oleic acid amide, PE wax, and paraffin wax. Among them, PEG, 0.2kg, oleic acid amide, 0.1kg, PE wax, 0.1kg, paraffin wax, 0.15kg.

[0061] The binder is a mixture of sodium phytate, benzotriazole octadecylamine, and BTA. Among them, sodium phytate 0.05kg, benzotriazole stearylamine salt 0.05kg, BTA 0.05kg.

[0062] The coupling agent is a phthalate, and the amount added is 0.02kg;

[0063] The surfactant is a mixture of Tween-80 and cyclohexaphosphate. Among them, the amount of Tween-80 is 0.05 kg, and the amount of cyclohexaphosphate is 0.03 kg.

[0064] The lubricant is lithium stearate, and the amount added is 0.1kg;

[0065] Dissolve the organic matter coating agent in a mixed solvent of ethanol (4kg) and petroleum ether (4.5kg), stir, and fully dissolv...

Embodiment 3

[0069] And embodiment 1, identical alloy powder, 100kg.

[0070] Organic coating agents include antioxidants, binders, lubricants, coupling agents and surfactants;

[0071] Wherein the amount of oleic acid amide is 0.05kg, the amount of PE wax is 0.1kg, the amount of paraffin wax is 0.15kg, and the amount of p-tert-butyl formaldehyde resin is 0.25kg.

[0072] Wherein, the amount of sodium phytate is 0.1 kg, the amount of benzotriazole octadecylamine salt is 0.05 kg, and the amount of dodecenylsuccinic acid is 0.05 kg.

[0073] The coupling agent is silane, and the amount added is 0.05kg;

[0074] The surfactant is a mixture of cyclohexyl phosphate and ammonium citrate. Wherein, the amount of cyclohexyl phosphate is 0.1kg, and the amount of ammonium citrate is 0.05kg;

[0075] The lubricant is polytetrafluoroethylene wax, and the amount added is 0.05kg.

[0076] Dissolve the organic matter coating agent in a mixed solvent of xylene (1.5kg) and petroleum ether (3.5kg), stir,...

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Abstract

The invention belongs to the field of sintered rare earth permanent magnet material manufacturing, and particularly relates to a manufacturing method of sintered neodymium iron boron. The preparationmethod comprises the following steps: obtaining neodymium-iron-boron alloy powder by using a conventional process; dissolving an organic matter coating agent into an organic solvent to prepare an organic matter coating solution; mixing the organic matter coating solution with neodymium-iron-boron alloy powder, and uniformly mixing, so that the surface of the powder is coated with a compact organicmatter coating film so as to achieve the effects of oxidation resistance, lubrication and bonding; and putting the powder into a mold, and carrying out magnetic field molding to directly press a high-density, high-strength and low-oxygenation green body without isostatic pressing, so that the sintered product has high dimensional precision, and the method is a near-net molding method.

Description

technical field [0001] The invention belongs to the field of manufacturing sintered rare earth permanent magnet materials, and in particular relates to a manufacturing method of sintered NdFeB. Background technique [0002] The characteristics of NdFeB alloy powder are hard, brittle, fine, afraid of oxidation and carburization. The current process is to carry out a magnetic field forming under the protection of nitrogen, and then carry out secondary cold isostatic pressing after wrapping plastic film, and then vacuum sintering. Finally, the product is cut and ground to obtain the desired shape of the magnet. [0003] The current conventional molding process. Low-voltage magnetic field forming is performed first, and then secondary isostatic pressing and high-pressure forming are performed. In addition, the initial pressing green body has low density and low strength (strength is less than 5MPa), and there are defects such as knocking off edges and corners in subsequent ope...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02H01F1/057
CPCH01F1/0577H01F41/026H01F41/0266
Inventor 郑方董永安
Owner JIANGXI KAIYUAN AUTOMATIC EQUIP CO LTD
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