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Method for preparing corrosion-resistant sintered neodymium iron boron (NdFeB) magnet

A NdFeB, corrosion-resistant technology, applied in the direction of magnetic objects, inductance/transformer/magnet manufacturing, magnetic materials, etc., can solve the problem of corrosion resistance of high-performance sintered NdFeB magnets, low comprehensive performance of rare earth permanent magnets, etc. problems, to achieve the effects of reduced weight loss, satisfactory corrosion resistance, and strong electrochemical corrosion resistance

Inactive Publication Date: 2012-02-15
WUXI NANLIGONG TECH DEV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the comprehensive properties of the rare earth permanent magnets corresponding to the material formulations and production methods involved in these two patents are relatively low, and the problems related to the corrosion resistance of high-performance sintered NdFeB magnets are not solved.

Method used

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  • Method for preparing corrosion-resistant sintered neodymium iron boron (NdFeB) magnet
  • Method for preparing corrosion-resistant sintered neodymium iron boron (NdFeB) magnet

Examples

Experimental program
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Effect test

Embodiment 1

[0030] A method for preparing a corrosion-resistant sintered NdFeB magnet, comprising the following steps:

[0031] Step 1. Select the main alloy as an alloy ingot. The atomic percentage composition of the main alloy is Nd: 11.0%, Dy: 1.0%, Tb: 0.5%, Nb: 0.1%, Al: 0.2%, Cu: 0.1%, Ga: 0.1 %, Fe: 81.0%, B: 6.0%, the main alloy ingot was homogenized at 1100°C for 20h.

[0032] Step 2, preparing auxiliary alloy, the atomic percentage composition of auxiliary alloy is Nd: 40.0%, Co: 60.0%.

[0033] In step 3, the auxiliary alloy is smelted by an induction melting method to obtain an auxiliary alloy ingot.

[0034] Step 4, the main and auxiliary alloys are respectively hydrogen crushed to make powder. Dehydrogenate the crushed main alloy at 550°C for 3h.

[0035]Step 5, mixing the main and auxiliary alloys after the hydrogen crushing treatment, the weight of the auxiliary alloy powder accounts for 5% of the total weight of the two, and simultaneously adds a lubricant accounting f...

Embodiment 2

[0041] A method for preparing a corrosion-resistant sintered NdFeB magnet, comprising the following steps:

[0042] Step 1. Select the main alloy as quick-setting flakes, and the atomic percentage composition of the main alloy is Nd: 7.2%, Pr: 0.5%, Dy: 2.2%, Tb: 0.9%, Co: 1.5%, Nb: 0.3%, Al: 0.3 %, Fe: 80.8%, B: 6.3%.

[0043] Step 2, preparing auxiliary alloy, the atomic percentage composition of auxiliary alloy is Nd: 30%, Pr: 25%, Dy: 1%, Co: 40%, Cu: 2%, Ga: 2%.

[0044] In step 3, the auxiliary alloy is smelted by an induction melting method to obtain an auxiliary alloy ingot.

[0045] Step 4, the main and auxiliary alloys are hydrogen crushed to make powder respectively, and the crushed main alloy is dehydrogenated at 500° C. for 4 hours.

[0046] Step 5, mixing the main and auxiliary alloys after the hydrogen crushing treatment, the weight of the auxiliary alloy powder accounts for 7% of the total weight of the two, and simultaneously adds 0.1% of the lubricant by we...

Embodiment 3

[0052] A method for preparing a corrosion-resistant sintered NdFeB magnet, comprising the following steps:

[0053] Step 1. Select the main alloy as an alloy ingot, and the atomic percentage composition of the main alloy is Nd: 7.2%, Pr: 0.5%, Dy: 2.0%, Tb: 0.5%, Co: 2.0%, Nb: 0.3%, Al: 0.5 %, Cu: 0.4%, Nb: 0.4%, Ga: 0.5%, Fe: 80.0%, B: 6.0%, the main alloy ingot was homogenized at 1050°C for 10h.

[0054] Step 2, preparation of auxiliary alloy, the atomic percentage composition of auxiliary alloy is Nd: 40%, Pr: 15%, Dy: 5%, Tb: 5%, Co: 25%, Al: 4%, Cu: 2%, Nb: 1%, Ga: 3%.

[0055] Step 3, using an arc melting method to melt the auxiliary alloy to obtain an auxiliary alloy ingot.

[0056] Step 4, the main and auxiliary alloys are hydrogen crushed to make powder respectively, and the crushed main alloy is dehydrogenated at 550° C. for 4 hours.

[0057] Step 5, mixing the main and auxiliary alloys after the hydrogen crushing treatment, the weight of the auxiliary alloy powde...

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Abstract

The invention discloses a method for preparing a corrosion-resistant sintered neodymium iron boron (NdFeB) magnet. In the method, an intergranular phase optimized design is used as a starting point on the basis of preparation technology of a double-alloy method, the high-cobalt content rare earth cobalt-based alloy which does not contain iron and boron is selected as an auxiliary alloy, and the melting point of the auxiliary alloy is ensured to be lower than 1,050 DEG C through component control so as to meet the liquid-phase sintering effect. By measuring the weightlessness condition of the material placed in an environment of the temperature of 120 DEG C, two atmosphere and 100 percent of humidity for 96 hours, results show that the weightlessness of the prepared sintered NdFeB magnet is only less than 1 / 3 of that of the sintered NdFeB magnet prepared by a single-alloy method and a conventional double-alloy method, and the sintered NdFeB magnet has excellent corrosion resistance. The method for preparing the corrosion-resistant sintered NdFeB magnet can be widely applied in the field of production of high-performance sintered NdFeB magnets.

Description

Technical field [0001] The present invention involves a preparation method for sintering tin iron boron magnets, especially a preparation method for corrosive sintering sintering and iron boron magnets. Background technique [0002] The sintering tin iron boron magnets prepared through the powder metallurgical process have excellent magnetic properties and have been widely used in many fields such as electronics, automobiles, computers, power, machinery, energy, environmental protection, national defense, medical equipment and other fields.Sinterned and iron boron -based permanent magnet materials are mainly primary (close to ND 2 FE 14 B phase) composition of the rare soil (Note: Another rich boron phase, when the percentage of the atom of the boron boron in the sintering tin iron boron boron is less than 6.5 %, the phase may be ignored).Rich soil is generally distributed in the crystal world, forming the crystal phase.Rich soil phase is mainly composed of rare earth-iron interc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/057H01F41/02C22C1/03B22F1/00
Inventor 徐锋陈栋陈光卢国文朱海南杜宇雷李永胜杨森
Owner WUXI NANLIGONG TECH DEV
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