Anisotropic nano/amorphous composite phase bulk permanent magnet material and preparation method thereof

A permanent magnet material, anisotropic technology, applied in the field of high-performance bulk permanent magnet materials, can solve the problems of grain growth, performance deterioration, unavoidable and other problems, achieve less consumption of rare earth elements, easy control of the process, and reduce The effect of dosage

Active Publication Date: 2011-12-07
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, if one wants to obtain anisotropic bulk materials, such strips still need to be crushed and then sintered or bonded to shape, which cannot avoid the complex process of master alloy smelting-crushing and powder-forming, and this nanocrystal is very difficult in the sintering process. Prone to grain growth leading to performance deterioration

Method used

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  • Anisotropic nano/amorphous composite phase bulk permanent magnet material and preparation method thereof
  • Anisotropic nano/amorphous composite phase bulk permanent magnet material and preparation method thereof
  • Anisotropic nano/amorphous composite phase bulk permanent magnet material and preparation method thereof

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Embodiment 1

[0029] Embodiment 1: the nominal composition that the embodiment of the invention adopts is (Fe 71 B 21 Nd 8 ) 96 Nb 4 (atomic percent). The nominal purity of the raw materials used in the embodiment is Fe99.99%, B99.99%, Nd99.99%, Nb99.8%.

[0030] Fe-BMG preparation: at higher than 10 -3 Under the vacuum of Pa, the Nd is first melted by arc melting, the melting current is 550A, and the stirring voltage is 0.8V. Take it out after cooling, re-polish the surface and put Nb, Fe, B and purified Nd together into the crucible according to the nominal composition ratio, and evacuate to 10 -3 Pa, rush into high-purity Ar gas, degas with Zr and use arc melting together. The evenly smelted master alloy ingot is placed in a vacuum-sealed perforated quartz glass tube (hole diameter 1.0mm) and re-melted evenly by induction heating. The melt tension prevents the alloy melt from flowing down by itself. The induction melting temperature is 1240°C. Using high-purity Ar gas at a press...

Embodiment 2

[0032] Embodiment 2: the nominal composition that the embodiment of the invention adopts is (Fe 71 B 21 Nd 8 ) 96 Nb 4 (atomic percent). The nominal purity of the raw materials used in the embodiment is Fe99.99%, B99.99%, Nd99.99%, Nb99.8%.

[0033] The preparation of Fe-BMG is the same as in Example 1. Place the Fe-BMG obtained above under a strong magnetic field of 12-19T, and rapidly raise the temperature to 720°C. After the temperature is stabilized (within about half a minute), keep the temperature constant for 10 minutes, then slowly cool to 290°C for 10 minutes under a magnetic field, and then take the sample out for air cooling. Table 1 shows the magnetic comparison, and it can be seen that it has obvious anisotropy.

[0034] Table 1 Performance comparison of anisotropic permanent magnet materials.

[0035]

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Abstract

The invention discloses an anisotropic nano / amorphous composite phase block permanent magnet material and a preparation method thereof. The present invention is a complex phase block permanent magnetic material composed of nano-sized hard magnetic phase and soft magnetic phase evenly distributed on the block amorphous alloy matrix. The preparation method firstly casts the alloy melt directly to prepare the amorphous alloy bulk material, and then anneals under the magnetic field for devitrification treatment to obtain the nanometer / amorphous composite phase material. This composite material is based on bulk amorphous alloy (BMG), and nanoscale soft magnetic phase (α-Fe or Fe3B phase) and hard magnetic phase (Nd2Fe14B phase and Pr2Fe14B phase are equal) as dispersed phases. The invention has good anisotropic permanent magnetic properties, good mechanical and physical properties; the process flow is simple, and the preparation of the anisotropic nano / amorphous multi-phase bulk permanent magnetic material only needs two steps to complete; the cost is low , less rare earth resources are consumed.

Description

technical field [0001] The invention belongs to the high-performance block permanent magnet material technology, in particular to an anisotropic nano / amorphous composite phase block permanent magnet material and a preparation method thereof. Background technique [0002] The rare earth iron permanent magnet material refers to the permanent magnet material based on the intermetallic compound formed by rare earth and iron. NdFeB permanent magnets have high remanence, high coercive force and high magnetic energy product, known as the modern "magnet king". In recent years, with the increasing demand for miniaturization and light weight of devices such as linear motion and rotating motors (spindle motors and stepping motors, etc.), countries around the world are devoting themselves to the development of various anisotropic permanent magnets. Among them, the research on anisotropic bulk rare earth iron permanent magnets has become one of the hot spots in the research and applicat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C45/00H01F1/01C22F1/00
Inventor 陈光曹扬
Owner NANJING UNIV OF SCI & TECH
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