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A method for preparing composite magnets by thermal molding of tin-plated magnetic powder

A composite magnet, hot-molding technology, applied in the manufacture of inductors/transformers/magnets, electrical components, circuits, etc., can solve the problems of uneven distribution, large specific gravity, reduction, etc. simple craftsmanship

Active Publication Date: 2016-07-06
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the disadvantages of thermosetting resin as a binder in the prior art, and the problem of uneven distribution and excessive proportion of low melting point metal tin powder as a binder around magnetic powder, the present invention provides a surface-plated A method for preparing composite magnets by thermal molding of tin magnetic powder, which greatly improves the uniformity of binder distribution, reduces the percentage of binder, fully utilizes the good ductility and oxidation resistance of metal tin, and improves the overall performance of composite magnets

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Example 1: NdFeB magnetic powder electroplating technology deposits a coated tin layer, and hot molds to prepare a composite magnet

[0045] Plating solution formula: Na 2 SnO 3 80g / L, NaOH8g / L.

[0046] The process is as follows: Weigh Na 2 SnO 3 40g, NaOH4g, is dissolved in water and is mixed with 500 milliliters of electrodeposition solutions and puts into the tank, and the solution tank is made of plexiglass. The stainless steel plate is placed on the bottom of the tank and connected to the negative pole of the power supply through a lead wire as the cathode, and the tin plate is suspended in the electrodeposition solution as the anode, and the area ratio of the cathode to the anode is 1:2. Then weigh 50g of the quick-quenched NdFeB magnetic powder with the brand MQP13-9, go through the pretreatment of degreasing for 5 minutes, rinsing with water, 1 minute of surface activation, and rinsing with water, and put the pretreated NdFeB magnetic powder into the electr...

Embodiment 2

[0047] Example 2: NdFeB magnetic powder electroless plating technology deposits a coated tin layer, and hot molds to prepare a composite magnet

[0048] Electroless Plating Solution Formula: SnCl 2 ?2H 2 O80g / L, NaOH150g / L, NaH 2 PO 2 ?H 2 O90g / L, Na 2 C 6 h 5 o 7 2H 2 O200g / L.

[0049] The process is as follows: Weigh the SnCl 2 ?2H 2 O40g, NaOH75g, NaH 2 PO 2 ?H 2 O45g, Na 2 C 6 h 5 o 7 2H 2 O100g. Dissolve in water and be mixed with the electroless plating solution of 500 milliliters and pack into the tank, and the solution tank is made of plexiglass. Then weigh 40g of MQP13-9 quick-quenched NdFeB magnetic powder, go through the pretreatment of degreasing for 5 minutes, rinsing with water, 1 minute of surface activation, and rinsing with water, and put the pretreated SmFeN magnetic powder into the chemical In the plating solution, after being adsorbed by the magnet at the bottom of the tank, the samarium-iron-nitrogen magnetic powder is flatly spread on...

Embodiment 3

[0050] Example 3: SmFeN magnetic powder electroless plating technology deposits a coated tin layer, and hot molds to prepare a composite magnet

[0051] Electroless Plating Solution Formula: SnCl 2 ?2H 2 O75g / L, NaOH150g / L, NaH 2 PO 2 ?H 2 O80g / L, Na 2 C 6 h 5 o 7 2H 2 O190g / L.

[0052] The process is as follows: Weigh the SnCl 2 ?2H 2 O37.5g, NaOH75g, NaH 2 PO 2 ?H 2 O40g, Na 2 C 6 h 5 o 7 2H 2 O95g. Dissolve in water and be mixed with the electroless plating solution of 500 milliliters and pack into the tank, and the solution tank is made of plexiglass. Then take by weighing 35g of samarium-iron-nitrogen magnetic powder and go through the pretreatment of degreasing for 5 minutes, rinsing with clear water, surface activation for 1 minute, and rinsing with clear water, put the pretreated samarium-iron-nitrogen magnetic powder into the electroless plating solution, and pass through the pretreatment at the bottom of the tank. Magnetic adsorption, samarium ir...

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Abstract

The invention discloses a method for preparing a composite magnet from a surface tinned magnetic powder through hot embossing. The method includes the steps of covering the magnetic powder unoiled and activated previously with a low-melting-point metal tin coating by an electroplating technique or chemical plating technique method in a plating tank in which an alkaline plating solution containing tin ions is held, and then obtaining the magnetic powder covered with the tin coating through separating, washing and purifying, and preparing the tinned magnetic power into the composite magnet by the way of hot embossing. Due to the adoption of the method, the problems of easy aging, easy shrinking, easy water absorption and poor organic solvent resisting capability of the composite magnetic with a thermosetting resin as an adhesive are effectively improved; the tin coating is enabled to cover the particles of the magnetic powder in advance; the distribution uniformity of the magnetic powder and the metal tin is effectively promoted; when the composite magnet is prepared, the proportion of the adhesive in the magnetic is effectively reduced while the same mechanical strength in the prior art is achieved; and therefore, the magnetic performance of the composite magnet is improved.

Description

technical field [0001] The invention belongs to the fields of powder surface treatment technology and magnet preparation technology, and in particular relates to a method for coating low-melting-point metal tin on the surface of magnetic powder and molding at a certain temperature to prepare a composite magnet. Background technique [0002] Composite magnet prepared by molding refers to a bonded composite magnet prepared by molding method after uniformly mixing magnetic powder with binder, coupling agent and other polymer compounds. In recent years, electronic appliances, instrumentation and other products have developed rapidly towards miniaturization and complex shapes, which also put forward higher requirements for the performance and processing of magnetic materials. Bonded composite magnets have simple production processes and high product dimensional accuracy. , good consistency, and many other advantages such as large degree of freedom in shape, so bonded composite ma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/02C25D3/30C23C18/31B22F3/03H01F41/02
Inventor 郑精武陈海波乔梁姜力强车声雷蔡伟应耀
Owner ZHEJIANG UNIV OF TECH
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