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Preparing method of nylon bonded Nd-Fe-B magnet

A NdFeB magnet technology is applied in the field of preparation of bonded NdFeB permanent magnet materials, which can solve the problems of low injection pressure and high nylon content, and achieve the effects of improving filling behavior, simple preparation method and reducing frictional force.

Inactive Publication Date: 2009-10-14
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a method for preparing a nylon-bonded Nd-Fe-B magnet, which solves the problems of high nylon content and low injection pressure in the process of preparing nylon-bonded Nd-Fe-B magnets by the existing injection molding method, and reduces the number of nylon-bonded Nd-Fe-B magnets. -Nylon content in Fe-B magnets, increase the density of bonded Nd-Fe-B magnets to improve the magnetic and mechanical properties of nylon bonded Nd-Fe-B magnets

Method used

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  • Preparing method of nylon bonded Nd-Fe-B magnet

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Effect test

Embodiment 1

[0019] (1) Surface modification treatment step: add 1g silane into a beaker equipped with 50ml ethanol to prepare 0.02g / ml silane ethanol solution, then add 200g of isotropic Nd-Fe-B magnetic powder, at this time the silane and magnetic powder The mass ratio is 0.5%. After stirring for 20 minutes, put it into an ultrasonic cleaner for vibration dispersion treatment for 2 hours, take it out and let it stand for 3 hours, and then dry it in an oven at a drying temperature of 60°C to obtain coupled magnetic powder;

[0020] (2) Molding step: take 1.5g nylon powder and 100g coupled magnetic powder and mix evenly. At this time, the mass ratio of nylon powder and coupled magnetic powder is 1.5%. Each time weigh the same amount of powder and put it into the mold. After the temperature rises to 180°C, carry out compression molding under a pressure of 600Mpa, hold the heat for 5 minutes, and then cool the mold to 50°C for demoulding to obtain a sample blank;

[0021] (3) Curing treatmen...

Embodiment 2

[0024] (1) Surface modification treatment step: 3g silane is added in the beaker that 120ml ethanol is housed to prepare the silane ethanol solution of 0.025g / ml, then add the isotropic Nd-Fe-B magnetic powder of 200g, now the silane and magnetic powder The mass ratio is 1.5%. After stirring for 30 minutes, put it into an ultrasonic cleaner for vibration dispersion treatment for 3 hours, take it out and let it stand for 5 hours, and then dry it in an oven at a drying temperature of 80°C to obtain coupled magnetic powder;

[0025] (2) Molding step: take 5.0g nylon powder and 100g coupled magnetic powder and mix evenly. At this time, the mass ratio of nylon powder to coupled magnetic powder is 5.0%. Each time weigh the same amount of powder and put it into the mold. After the temperature rises to 220°C, it is pressed and formed under a pressure of 1200Mpa, the heat preservation and pressure holding time is 10min, and then the mold is cooled to 60°C for demoulding to obtain a samp...

Embodiment 3

[0029] (1) Surface modification treatment step: 2g silane is added in the beaker that 90ml ethanol is housed to prepare the silane ethanol solution of 0.0222g / ml, then add the isotropic Nd-Fe-B magnetic powder of 200g, now the silane and magnetic powder The mass ratio is 1.0%. After stirring for 25 minutes, put it into an ultrasonic cleaner for vibration dispersion treatment for 2.5 hours, take it out and let it stand for 4 hours, and then dry it in an oven at a drying temperature of 70°C to obtain coupled magnetic powder;

[0030] (2) Molding step: take 4.0g nylon powder and 100g coupled magnetic powder and mix evenly. At this time, the mass ratio of nylon powder to coupled magnetic powder is 4.0%. Each time weigh the same amount of powder and put it into the mold. After the temperature rises to 200°C, carry out compression molding under a pressure of 1000Mpa, hold the heat for 8 minutes, and then cool the mold to 55°C for demoulding to obtain a sample blank;

[0031] (3) Cur...

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Abstract

The invention discloses a preparing method of nylon bonded Nd-Fe-B magnet, belonging to the preparing method of bonded Nd-Fe-B permanent magnet material and aiming at solving the problems of high nylon content and low injection pressure in the current injection moulding method to reduce the nylon content in the nylon bonded Nd-Fe-B magnet, thereby increasing the magnetic performance and mechanical property of the nylon bonded Nd-Fe-B magnet. The invention comprises the following steps: surface modifying process, moulding, curing process, surface treatment and magnetizing. In the nylon bonded isotropic Nd-Fe-B magnet prepared by the invention, the content of nylon is 4.5wt%, the flexural strength is 84.7 MPa, the compressive strength is 138 MPa, the residual magnetism is 0.688 T, the intrinsic coercivity is 782 kA / m, and the magnetic energy product is 74.1 kJ / m; compared with traditional injection moulding method, the invention is featured by high performance, simple preparing method, economic practicability, easy realization of industrialized mass production and good popularization and application prospect.

Description

technical field [0001] The invention belongs to a preparation method of a bonded NdFeB permanent magnet material, in particular to a preparation method of a nylon bonded isotropic NdFeB magnet. Background technique [0002] Bonded Nd-Fe-B permanent magnet material is a new type of permanent magnet composite material developed in recent years. It has been widely used in the fields of information, automobiles, audio systems, control systems, measuring instruments, office automation and household appliances. demand is still increasing. There are four main molding processes for bonded Nd-Fe-B magnets: compression molding, injection molding, calendering and extrusion molding, among which the performance of compression molding bonded Nd-Fe-B magnets is the highest among the four molding methods , Its output is also the largest. Injection molding bonded Nd-Fe-B magnets can prepare small magnets with complex shapes, which is easy to realize net molding and batch automatic productio...

Claims

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Application Information

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IPC IPC(8): H01F41/02H01F7/02H01F1/057B22F3/00
Inventor 熊惟皓张修海杨青青瞿峻叶大萌姚振华
Owner HUAZHONG UNIV OF SCI & TECH
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