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Process for producing rare-earth-iron-boron permanent magnet alloy powder by reduction diffusion

A technology of alloy powder and permanent magnetic alloy, which is applied in the field of rare earth permanent magnetic alloy powder manufacturing, and can solve the problems of damaging the magnetic properties of powder particles

Inactive Publication Date: 2003-06-18
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention adopts the method of metal thermal reduction and diffusion alloying to prepare the R-Fe-B alloy powder with controllable particle size, which solves the problem of damaging the magnetic properties of the powder particles when the particle size of the powder is further refined by the mechanical crushing method

Method used

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Examples

Experimental program
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Effect test

example 1

[0020] The raw material is Nd 2 o 3 , Fe powder (400 mesh) B-Fe powder (400 mesh) according to the target composition Nd 15 Fe 77 B 8 Added, the particle size of metal Ca is 3mm, the amount added is 20% higher than the chemical dosage, and NdCl is added 3 The amount to make its Nd is 3% of the stoichiometric amount of Nd in the obtained target alloy, vacuum dehydration, Nd 2 o 3 After roasting treatment. Reduction and diffusion reaction: under the protection of argon, keep warm at 850°C for 3 hours, stir the reaction block in water, the block is pulverized and precipitated, and CaO flocs are separated, the alloy powder is filtered and then vacuum-dried. The magnetic properties of the prepared alloy powder are: Br=10kGs, M Hc = 9kOe, (BH)m = 20MGOe.

example 2

[0022] The raw material is Nd 2 o 3 , Dy 2 o 3 , Fe powder (500 mesh,) B-Fe powder (500 mesh) and Co powder (500 mesh), according to the target composition (Nd 0.95 Dy 0.05 ) 15 (Fe 0.90 co 0.1 ) 77 B 8 Ingredients, the particle size of metal Ca is 3mm, the added amount exceeds the chemical dosage by 15%, and NdCl is added 3 The amount of Nd is such that its Nd is 5% of the stoichiometric amount of Nd in the resulting target alloy. Reduction diffusion reaction: under the protection of argon, heat at 860°C for 3 hours, stir the reaction block in water, the block is pulverized and precipitated, and CaO flocs are separated, the alloy powder is filtered and then vacuum-dried. The magnetic properties of the prepared alloy powder are: Br=11kGs, M Hc = 11kOe, (BH)m = 25MGOe.

[0023]

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Abstract

A process for preparing permanent-magnet RE-Fe-B alloy powder by reduction-diffusion method includes such steps as choosing raw materials, pretreating, proportioning, mixing RE oxide, Fe powder, Ca, CaH2, NdCl3 and CaCl3, thermal reducing and diffusion alloying at 820-960 deg.C, chemical separating, dewatering, drying and preparing anisotropic RG-Fe-B magnet.

Description

technical field [0001] The invention belongs to the technical field of magnetic materials, and in particular provides a method for manufacturing rare earth permanent magnetic alloy powder. Background technique: [0002] Nd-Fe-B series rare earth permanent magnet is a kind of permanent magnet material with excellent performance, which has two types: sintered and bonded. Bonded R-Fe-B magnets can be made into thin, special-shaped and can be integrally formed with the device. They have the characteristics of high precision, high material utilization rate, and good charging and demagnetization characteristics. Currently, the magnetic powder used for bonding R-Fe-B permanent magnets The preparation techniques include quick quenching method (US4802931, US4851858) and HDDR method. The rapid quenching method is based on high-purity metal neodymium, high-purity iron, boron or boron-iron alloy as raw materials, vacuum smelted into R-Fe-B master alloy, and then remelted, the melt is s...

Claims

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Application Information

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IPC IPC(8): B22F9/20
Inventor 陈菊芳孙光飞
Owner UNIV OF SCI & TECH BEIJING
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