Method for producing Sm-Fe-N permanent magnet alloy powder by reduction diffusion

A technology of permanent magnetic alloy and diffusion method, which is applied in the field of magnetic materials, can solve the problems of high melting point, achieve high-performance anisotropy, reduce volatilization loss, and improve the magnetic properties of powder
CN1254338CInactive Publication Date: 2006-05-03UNIV OF SCI & TECH BEIJING
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Patent Information

Authority / Receiving Office
CN ¡ China
Patent Type
Patents(China)
Current Assignee / Owner
UNIV OF SCI & TECH BEIJING
Publication Date
2006-05-03
Estimated Expiration
Not applicable ¡ inactive patent
Patent Text Reader

Abstract

The invention provides a method for manufacturing Sm-Fe-N permanent magnetic alloy powder by adopting a reduction diffusion method. The process flow is: selection of raw materials and pretreatment→ratio of reactants→mixing of reactants→metal thermal reduction and diffusion alloying→chemical separation of reaction products→dehydration and drying of metal powder→powder nitriding treatment→manufacture of anisotropic bonding Sm-Fe-N magnet; it is characterized in that: use rare earth chloride and selectively control the particle size of alloy element iron powder, and the reducing agent is metal Ca and CaH 2 , carry out reduction diffusion reaction in the lower temperature range of 760-860 ℃ to generate Sm-Fe alloy and by-products, and after chemical separation, Sm-Fe alloy is pulverized and nitrided to directly obtain Sm-Fe with required composition and particle size requirements -N magnetic alloy powder. The advantages are: low reaction temperature, small loss of Sm, easy control of composition, simplified process and good performance.
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Description

Technical field:

[0001] The invention belongs to the field of magnetic materials, and in particular provides a method for manufacturing Sm-Fe-N permanent magnetic alloy powder. Background technique:

[0002] Sm-Fe-N series alloy is a kind of rare earth permanent magnet material with excellent performance. In terms of basic magnetic properties, its saturation magnetization is equivalent to that of R-Fe-B system, and the anisotropy field and Curie temperature ratio R- Fe-B should be high. Since Sm-Fe-N will decompose when it is higher than 600°C, it is mainly used to manufacture bonded magnets, and the magnetic properties of bonded magnets mainly depend on the magnetic properties of Sm-Fe-N magnetic powder. At present, the preparation methods of Sm-Fe-N magnetic powder include ingot mechanical crushing method, also known as conventional method (IEEE.Trans.Mag.1993(29):2815); HDDR method (Physical Statuas Solidi A 1995(147):229); Rapid quenching method (J.Appl.Phys.1991.70(6)...

Claims

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