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Coating, neodymium-iron-boron magnet and preparation method and application of neodymium-iron-boron magnet

A neodymium iron boron and coating technology is applied in the field of magnet surface protection treatment to achieve the effects of high assembly precision, saving assembly cost and improving corrosion resistance

Pending Publication Date: 2022-01-04
YANTAI ZHENGHAI MAGNETIC MATERIAL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to improve the difficulty of assembling magnetic materials and save labor, the present invention provides a coating composition, which contains a foam

Method used

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  • Coating, neodymium-iron-boron magnet and preparation method and application of neodymium-iron-boron magnet
  • Coating, neodymium-iron-boron magnet and preparation method and application of neodymium-iron-boron magnet
  • Coating, neodymium-iron-boron magnet and preparation method and application of neodymium-iron-boron magnet

Examples

Experimental program
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Effect test

Embodiment 1

[0108] To prepare NdFeB magnets, choose square NdFeB products with specifications of 20mm×10mm×3.5mm as the magnet matrix, and the steps are as follows:

[0109] 1. Surface pretreatment of magnet substrate:

[0110] 1) Degreasing: Degreasing NdFeB products with non-foaming, phosphorus-free, normal-temperature degreasing solution for 120s;

[0111] 2) wash twice;

[0112] 3) Rust removal: use dilute nitric acid with a volume concentration of 5% to carry out rust removal treatment on the degreased product, and the treatment time is 40s;

[0113] 4) After the rust removal is completed, the product is subjected to ultrasonic water washing-water washing;

[0114] 5) Activation: Use an activation solution to activate the derusted NdFeB products. The activation solution is composed of 3.5wt% citric acid, 1g / L thiourea and 1g / L sodium dodecylbenzenesulfonate. The activation time is 12s;

[0115] 6) washing twice with water to obtain a pretreated NdFeB product.

[0116] 2. Arrange...

Embodiment 2

[0122] This embodiment adopts the magnet same as embodiment 1 to prepare NdFeB magnet, the method of pretreatment is the same, the first coating and the second coating are all the same as embodiment 1, and its difference is:

[0123] The powder of the coating composition was arranged on the surface of the magnet substrate by brushing, pre-cured, and dried in an oven at 75° C. for 35 minutes. The thickness of the cured second coating was 110 μm, and an NdFeB magnet was obtained. Heating expansion conditions: oven at 190°C for 20 minutes to obtain an expanded NdFeB magnet, wherein the second coating expands after heating, which is designated as sample 2.

Embodiment 3

[0125] This embodiment adopts the same magnet as in Embodiment 1 to prepare NdFeB magnets, and the pretreatment method is the same, the difference is:

[0126] Without applying the first coating, the same second coating as in Example 1 was directly applied.

[0127] The powder of the coating composition was arranged on the surface of the magnet substrate by brushing, pre-cured, and dried in an oven at 75° C. for 35 minutes. The thickness of the cured second coating was 110 μm, and an NdFeB magnet was obtained. Heating expansion conditions: oven at 190°C for 20 minutes to obtain an expanded NdFeB magnet, wherein the second coating expands after heating, which is designated as sample 3.

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Abstract

The invention relates to a coating, a neodymium-iron-boron magnet and a preparation method and application of the neodymium-iron-boron magnet. The coating comprises a first coating layer and a second coating layer, the first coating layer is arranged on the magnet, and the second coating layer is arranged on the first coating layer. The second coating layer is prepared from a coating composition; and the coating composition contains a foaming body. When the foaming body is heated at the expansion temperature or at the temperature higher than the expansion temperature, the foaming body can expand, and expansion is irreversible. The surface of the magnet contains the coating layers, so that the disadvantage that the corrosion resistance is low due to large pores is improved, the overall corrosion resistance, insulativity and thickness consistency of the magnet are improved, and the magnet has good corrosion resistance and binding force with the magnet and a magnetic steel groove.

Description

technical field [0001] The invention relates to the field of magnet surface protection treatment, in particular to a coating, an NdFeB magnet and a preparation method and application thereof. Background technique [0002] NdFeB magnets are widely used in automotive motors, wind power generation, elevators, traction machines and other fields due to their excellent magnetic properties. For high-speed permanent magnet motors, rotor magnet loss has become a key factor affecting its reliable operation. In order to reduce the eddy current loss of the magnetic steel, the built-in permanent magnet motor (IPM) usually assembles one or more pieces of permanent magnet NdFeB magnetic steel together, coats the insulating coating and encapsulates it in the magnetic steel slot. To reduce the eddy current loss of the magnet. In this process, potting resin has always been the focus of motor design improvement. The fluidity, bonding strength, insulation, thermal conductivity, oil resistance...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D133/00C09D175/04C09D5/08C09D5/03C09D7/61C09D7/63C09D7/65H01F7/02C23C22/73C25D3/12C25D7/00C25D13/06H02K1/02H02K1/27
CPCC09D133/00C09D175/04C09D5/08C09D5/03C09D7/61C09D7/63C09D7/65H01F7/02C23C22/73C25D3/12C25D7/001C25D13/04H02K1/02H02K1/27C08L83/04C08K5/3472C08K3/04C08K5/06C08K13/02C08K5/29C08K5/098C08K5/05C08K7/10C08K5/17C08K3/346C08K13/04
Inventor 彭步庄刘艳魏蕊王鹏飞王福霖
Owner YANTAI ZHENGHAI MAGNETIC MATERIAL CO LTD
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