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Pr/Nd based biphase composite permanent magnetic material and block body preparing method thereof

A nano-composite, permanent magnet material technology, applied in the direction of magnetic materials, magnetic objects, electrical components, etc., can solve the problems of low density, decoupling, low magnetic performance, etc.

Active Publication Date: 2009-05-06
浙江凯文磁钢有限公司
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0008] The present invention aims at the bulk Nd produced by crystallization annealing and bonding method after direct rapid quenching of the melt 2 Fe 14 In the B / α-Fe nano-two-phase permanent magnet material, the problem of low magnetic performance due to the deficiency of the preparation process is to provide a Pr / Nd-based two-phase nano-composite permanent magnet with low rare earth content, low cost, and good corrosion resistance. Magnetic material formula and method for preparing high-density block by ultra-high pressure
This method effectively solves the problems of large grain size deviation between soft and hard magnetic phases, insufficient contact between soft and hard magnetic phases leading to decoupling, and low density due to doping with organic binders. The bulk sample is close to the ideal exchange coupling model requirements of soft and hard magnetic phases, thus greatly improving the magnetic properties of this type of material, and providing a new way to realize the preparation of nanocomposite magnets with ideal microstructure

Method used

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  • Pr/Nd based biphase composite permanent magnetic material and block body preparing method thereof
  • Pr/Nd based biphase composite permanent magnetic material and block body preparing method thereof

Examples

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Effect test

Embodiment 1

[0025] According to the alloy formula (Pr 70 Nd 30 ) 9 Fe 80.5 Tb 1 Ti 3 V 0.5 B 6 Each alloy raw material was weighed, and the master alloy was repeatedly smelted four times under the protection of Ar, and the melt was rapidly quenched on a water-cooled molybdenum wheel at a cooling rate of 50m / s to prepare a compound with (Pr, Nd) 2 Fe 14 B / α-Fe Nano-Quenching Ribbons. Put the prepared quick-quenched strip into the mold of the graphite box, place it in a six-sided top pressure ultra-high pressure equipment, and sinter it under the Ar gas environment. The fixed pressure is 30GPa, the heating rate is 10°C / min, and the heating temperature reaches Sintering was carried out at 500°C, the holding time was 10min, and the sample was cooled with the furnace. Finally, a fully dense block (Pr, Nd) is obtained 2 Fe 14 B / α-Fe dual-phase nanocomposite permanent magnet material, its internal microstructure is as follows figure 1 shown. The nanocrystalline grain size distributi...

Embodiment 2

[0027] According to the alloy formula (Pr 45 Nd 55 ) 9.5 Fe 79.3 Tb 1.2 Ti 4 V 1 B 5 Each alloy raw material was weighed, and the master alloy was repeatedly smelted four times under the protection of Ar, and the melt was rapidly quenched on a water-cooled molybdenum wheel at a cooling rate of 40m / s to prepare a compound with (Pr, Nd) 2 Fe 14 B / α-Fe Nano-Quenching Ribbons. Put the prepared quick-quenched strip into the mold of the graphite box, place it in a six-sided top pressure ultra-high pressure equipment, and sinter it in an Ar gas environment. The fixed pressure is 1GPa, the heating rate is 15°C / min, and the heating temperature reaches Sintering was carried out at 800°C, the holding time was 10min, and the sample was cooled with the furnace. Finally, a fully dense block (Pr, Nd) is obtained 2 Fe 14 B / α-Fe dual-phase nanocomposite permanent magnet material. It is characterized by transmission electron microscopy that the grain size of nanocrystals is evenly d...

Embodiment 3

[0029] According to the alloy formula (Pr 50 Nd 50 ) 9.5 Fe 79.3 Tb 1.2 Ti 4 V 1 B 5 Each alloy raw material was weighed, and the master alloy was repeatedly smelted four times under the protection of Ar, and the melt was rapidly quenched on a water-cooled molybdenum wheel at a cooling rate of 10m / s to prepare a compound with (Pr, Nd) 2 Fe 14 B / α-Fe Nano-Quenching Ribbons. Put the prepared quick-quenched strip into the mold of the graphite box, and put it in the ultra-high pressure equipment with six-sided top pressure at N 2 Sintering in an air environment, fixed pressure is 12GPa, heating rate is 40°C / min, heating temperature is 900°C for sintering, holding time is 13min, and the sample is cooled with the furnace. Finally, a fully dense block (Pr, Nd) is obtained 2 Fe 14 B / α-Fe dual-phase nanocomposite permanent magnet material. It is characterized by transmission electron microscopy that the grain size of nanocrystals is evenly distributed, and the average size ...

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Abstract

The invention relates to a Pr / Nd-based two-phase nano-composite permanent magnet material and a method for the preparation of the block body thereof. The invention comprises the composing general formula of the two-phase nano-composite permanent magnet material: a (Pr, Nd)-Fe-R-Ti-QB system, wherein Pr and Nd are main rare earth components in hard magnetic phase (Pr, Nd)2Fe14B base material; R is one or more than two of Nb, Dy, Tb and Ga; Q is one or more than two of V, Mo, Zr, W and Au; the molar fraction is as follows: x is more than or equal to 4 and less than or equal to 11, y is more than or equal to 0.1 and less than or equal to 3, z is more than or equal to 0.1 and less than or equal to 4, m is more than or equal to 0 and less than or equal to 2, n is more than or equal to 6 and less than or equal to 10, w is more than or equal to 20 and less than or equal to 80, and the balance being Fe. The preparation of the block body (Pr, Nd) 2Fe14B / Alpha-Fe comprises the following steps of (1) smelting master alloy; (2) fast quenching of thin strips; (3) preparing the block body by ultra-high heat pressing, in which the thin strip alloy is put in a graphite mold and then is placed in an ultra-high pressure device, and is sintered for 1 to 30min when the temperature is heated to between 500 and 1000 DEG C at 10-50 DEG C / min, under the pressure intensity of between 1 and 12 GPa and Ar gas protective environment. The Pr / Nd-based two-phase nano-composite permanent magnet material has the advantages of low-content rare earth, low cost, good anti-saturation effect, and the like; the magnetic energy is more than 180 kJ / m3, and the density is more than 74.5 g / cm3.

Description

technical field [0001] The invention relates to a magnetic functional material, in particular to a dual-phase nanocomposite permanent magnet material with low cost and good corrosion resistance and a preparation method thereof. Background technique [0002] Nano-composite permanent magnet alloys utilize the advantages of high magnetic crystal anisotropy of the hard magnetic phase and high saturation magnetization of the soft magnetic phase, and obtain excellent magnetic properties through the ferromagnetic exchange coupling between the two-phase grains at the nanoscale , the theoretical magnetic energy product can be as high as 10 6 J / m 3 , known as the "megajoule permanent magnet". Due to its low rare earth content, low price and good corrosion resistance, it is expected to develop into a new generation of high-performance permanent magnet materials. At present, the hard magnetic phase in nanocrystalline composite permanent magnet materials is mainly Nd 2 Fe 14 B or Sm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/053B22F1/00B22F3/12C22C1/03
Inventor 葛洪良张朋越朱津津陈奎宇
Owner 浙江凯文磁钢有限公司
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