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A kind of preparation method of press-bonded NdFeB magnet

A neodymium iron boron and magnet technology, used in magnetic objects, inductance/transformer/magnet manufacturing, magnetic materials, etc., can solve the problems of a large amount of waste water and waste gas, surface defects of magnets, and high management costs, to improve mixing uniformity, excellent The effect of magnetic performance and low process cost

Active Publication Date: 2022-07-08
宁波不二磁电科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing preparation methods of bonded NdFeB magnets have the following problems: 1. Acetone is a precursor chemical, and its purchase, storage and use are strictly controlled, resulting in high management costs; 2. The melting point of zinc stearate is 130°C , when the magnet is solidified, it is easy to gasify and cause surface defects of the magnet; 3. Coating processes such as electroplating or electrophoresis will generate a large amount of waste water and waste gas, thereby causing environmental pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1: A preparation method for pressing and bonding NdFeB magnets, firstly adding 0.5 part of coupling agent (brand KH-550) into 2 parts of ethyl acetate to dissolve, and then adding 100 parts of NdFeB powder Stir well until the ethyl acetate is completely volatilized to obtain NdFeB magnetic powder, dissolve 4 parts of epoxy resin (brand 0191) into 10 parts of ethyl acetate, and stir for 30 minutes to prepare a binder solution. 7 parts of the binder solution was added to the NdFeB magnetic powder prepared before, and stirred at 60 ° C until the ethyl acetate was completely volatilized to obtain a semi-finished master powder. Stir at ℃ until the solvent evaporates, add 0.5 part of lubricant, and stir for 30 minutes to obtain the finished master powder. Take the finished master powder and press to obtain a magnet blank with an outer diameter of 23 mm, an inner diameter of 20 mm and a height of 10 mm, which is divided into three sections in an oven. For curing, the c...

Embodiment 2

[0021] Embodiment 2: A preparation method for pressing and bonding NdFeB magnets. First, 0.6 parts of coupling agent (brand KH-550) is added to 2 parts of ethyl acetate to dissolve, and then 100 parts of NdFeB powder are added. Stir well until the ethyl acetate is completely volatilized to obtain NdFeB magnetic powder, dissolve 6 parts of epoxy resin (brand 0191) into 10 parts of ethyl acetate, and stir for 40 minutes to prepare a binder solution. 7 parts of the binder solution was added to the NdFeB magnetic powder prepared before, and stirred at 60 ° C until the ethyl acetate was completely volatilized to obtain a semi-finished master powder. Stir at ℃ until the solvent evaporates, add 0.4 parts of lubricant, and stir for 30 minutes to obtain a finished master powder. Take the finished master powder and press to obtain a magnet blank with an outer diameter of 10 mm, an inner diameter of 5 mm and a height of 7 mm, which is divided into three sections in an oven. For curing, t...

Embodiment 3

[0023] Embodiment 3: A preparation method of pressing and bonding NdFeB magnets, firstly adding 0.5 part of coupling agent (brand KH-550) into 2 parts of ethyl acetate to dissolve, then adding 100 parts of NdFeB powder Stir well until the ethyl acetate is completely volatilized to obtain NdFeB magnetic powder, dissolve 6 parts of epoxy resin (brand 0191) into 10 parts of ethyl acetate, and stir for 40 minutes to prepare a binder solution. Add 8 parts of binder solution to the NdFeB magnetic powder prepared before, and stir at 60 ° C until the ethyl acetate is completely volatilized to obtain semi-finished master powder, and then add 8 parts of binder solution to the semi-finished master powder. Stir at ℃ until the solvent evaporates, add 0.5 part of lubricant, and stir for 30 minutes to obtain the finished master powder. Take the finished master powder and press to obtain a magnet blank with an outer diameter of 50 mm, an inner diameter of 42 mm and a height of 25 mm, which is ...

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Abstract

The invention discloses a preparation method for pressing and bonding NdFeB magnets. A binder solution is prepared by using ethyl acetate instead of acetone as a solvent, graphite powder is used instead of zinc stearate as a lubricant, and a NdFeB magnet powder is used as a lubricant. The two mixing processes with the binder solution make the finished master powder contain more epoxy resin than the normal use amount, which improves the mixing uniformity of the NdFeB magnetic powder and the excessively used binder solution. The binder is evenly overflowed and wrapped on the surface of the substrate to form a protective layer; the advantage is that it avoids the control of acetone purchase, storage and use, reduces material management costs, avoids magnet surface defects caused by zinc stearate vaporization, and omits electroplating It avoids environmental pollution caused by coating processes such as electroplating or electrophoresis, and avoids additional investment in wastewater and waste gas treatment generated by coating processes such as electroplating or electrophoresis. The process is simple and the process cost is relatively high. Low.

Description

technical field [0001] The invention relates to a preparation method of a bonded NdFeB magnet, in particular to a preparation method of a press bonded NdFeB magnet. Background technique [0002] NdFeB magnets have excellent magnetic properties and high cost performance, and have been widely used in electronics, automobiles and communications. The bonded NdFeB magnets have the characteristics of complex shape and various magnetization methods, and their use has been increasing in recent years. Due to the active nature of NdFeB material and easy corrosion, the bonded NdFeB magnet is usually composed of a NdFeB matrix and a protective layer covering the surface of the NdFeB matrix. The existing method for preparing a bonded NdFeB magnet is usually to prepare a NdFeB substrate first, and then use a coating process such as electroplating or electrophoresis to form a protective layer on the surface of the NdFeB substrate. In the process of preparing the NdFeB matrix, acetone is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F41/02H01F1/08H01F1/057B22F1/00B22F3/02
CPCH01F41/02H01F1/057H01F1/08B22F3/02B22F2003/023B22F1/105B22F1/145
Inventor 赵春伟陈旭安
Owner 宁波不二磁电科技有限公司
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