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A double alloy NdFeB rare earth permanent magnet and its manufacturing method

A rare earth permanent magnet and a manufacturing method technology, applied in the direction of inductance/transformer/magnet manufacturing, magnetic objects, magnetic materials, etc., can solve problems such as magnetic performance degradation

Active Publication Date: 2021-04-13
宁波金轮磁材技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Nd-rich phase is first corroded to form intergranular corrosion. In severe cases, a large amount of Nd oxides and hydrides are produced to pulverize the material, resulting in a decrease in magnetic properties

Method used

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  • A double alloy NdFeB rare earth permanent magnet and its manufacturing method
  • A double alloy NdFeB rare earth permanent magnet and its manufacturing method
  • A double alloy NdFeB rare earth permanent magnet and its manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] see figure 1 , a double alloy NdFeB rare earth permanent magnet, including a magnetic body 1, an anti-corrosion nickel base layer 2 outside the magnetic body 1 by electroless plating, and an acrylic protective layer 3 coated on the outer periphery of the anti-corrosion nickel base layer 2.

Embodiment 2a

[0047] see figure 2 , a kind of manufacturing method of double-alloy NdFeB rare earth permanent magnet, comprises the following steps:

[0048] Step1.1, select a Pr-Nd alloy with a purity greater than 99.8%, wherein Pr accounts for 20% of the total weight of the Pr-Nd alloy; select a B-Fe alloy with a purity greater than 99.8%, wherein B accounts for 20% of the total weight of the B-Fe alloy ;

[0049]Step1.2.1, weigh 29 parts by weight of Pr-Nd alloy, 3 parts by weight of Co, 0.2 parts by weight of Zr, 61.8 parts by weight of Fe, 5 parts by weight of B-Fe alloy, and add Fe in the vacuum smelting furnace in turn , B-Fe alloy, Pr-Nd alloy, Co, Zr, smelting ingots in an argon atmosphere at 1300 ° C, and cooling naturally without opening the furnace to obtain ingots of main phase alloys;

[0050] Step1.2.2, weigh 10 parts by weight of Pr-Nd alloy, 20 parts by weight of Dy, 2 parts by weight of Co, 8 parts by weight of Al, 4 parts by weight of Ga, 50 parts by weight of Fe and 5...

Embodiment 3

[0063] The manufacturing method of embodiment 3 and embodiment 2a is roughly the same, and its difference is, the electroless nickel plating solution of 903 among the embodiment 3a adds the Zr that accounts for 0.2% of the nickel gross weight in the nickel plating solution before electroplating and passes through Ultrasonic dispersion.

[0064] Will make permanent magnet by embodiment 2a-embodiment 2e, embodiment 3, and carry out following experiment as comparative example 2a with embodiment 2a not carrying out step7:

[0065] Put the permanent magnet into the test box, spray 0.1mol / L sodium chloride solution into the test room through the atomizing nozzle, keep the visibility in the test room under the salt spray state < 5m, spray for 48 hours at 37°C, and observe through Example 2a- Whether there are rust spots on the surface of the anti-corrosion nickel base layer of the permanent magnet prepared in Example 2e, whether the anti-corrosion nickel base layer is peeled off, and...

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Abstract

The invention discloses a double-alloy NdFeB rare-earth permanent magnet and a manufacturing method thereof, which solves the problem that a double-alloy NdFeB rare-earth permanent magnet is easily oxidized in the air and has poor corrosion resistance. The main points of the technical scheme are: a Double alloy NdFeB rare earth permanent magnet, the permanent magnet includes a main phase alloy and an auxiliary phase alloy mixed and sintered at a ratio of 15:1; the surface of the magnetic body is also coated with an anti-corrosion nickel base layer and an acrylic protective layer. The coating protects the permanent magnet and improves the corrosion resistance of the permanent magnet.

Description

technical field [0001] The invention relates to permanent magnet materials, in particular to a double-alloy NdFeB rare earth permanent magnet and a manufacturing method thereof. Background technique [0002] NdFeB magnetic material is an alloy of praseodymium neodymium metal, boron iron, etc. Used in medical nuclear magnetic resonance imaging, computer hard drives, audio, mobile phones, etc.; with the requirements of energy saving and low-carbon economy, NdFeB rare earth permanent magnet materials have begun to be used in auto parts, household appliances, energy saving and control motors, hybrid Power vehicles, wind power and other fields of application. [0003] Neodymium in NdFeB permanent magnets is a rare earth element with strong chemical activity. Its standard equilibrium potential is -2.431V. It is easily oxidized in air and has poor corrosion resistance. And in the sintered NdFeB permanent magnet material, the electrochemical potentials of the B-rich phase, the Nd-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/04B22F3/10B22F3/24C23C18/32C09D4/06C09D4/02C09D5/08H01F1/057H01F41/02
CPCH01F1/0577H01F41/0266C23C18/32C09D4/06C09D5/08B22F3/1007B22F3/24B22F9/023B22F9/04B22F2998/10B22F2003/242B22F1/10B22F3/02
Inventor 赵渭敏于博赵胤杰
Owner 宁波金轮磁材技术有限公司