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Anisotropic nano/amorphous complex phase block permanent-magnetic material and preparation method thereof

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

Active Publication Date: 2010-03-17
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 complex phase block permanent-magnetic material and preparation method thereof
  • Anisotropic nano/amorphous complex phase block permanent-magnetic material and preparation method thereof
  • Anisotropic nano/amorphous complex phase block permanent-magnetic material and preparation method thereof

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Embodiment 1

[0027] Embodiment 1: the nominal composition that the embodiment of the invention adopts is (Fe 71 B 21 Nd 8 ) 96 Nb 4 (atomic percent). Examples The nominal purity of raw materials used is Fe 99.99%, B99.99%, Nd99.99%, Nb99.8%.

[0028] 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. The melt was blown into a metal mold with an in...

Embodiment 2

[0030] 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%.

[0031] 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.

[0032] Table 1 Performance comparison of anisotropic permanent magnet materials.

[0033]

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Abstract

The invention discloses an anisotropic nano / amorphous complex phase block permanent-magnetic material and a preparation method thereof. The complex phase block permanent-magnetic material consists ofnano-sized hard magnetic phases and a nano-sized soft magnetic phase which are evenly distributed on a block amorphous alloy matrix. The preparation method for the complex phase block permanent-magnetic material comprises the following steps: firstly, directly casting an alloy melt to form a metal glass block material, then annealing the metal glass block material under a magnetic field, and performing devitrification treatment of the annealed metal glass block material to obtain the nano / amorphous complex phase material. The complex phase material uses a block metal glass (BMG) as the matrix,and the nano-sized soft magnetic phase (alpha-Fe or Fe3B phase) and the hard magnetic phases (Nd2Fe14B phase, Pr2Fe14B and the like) are used as dispersion distribution phases. The anisotropic nano / amorphous complex phase block permanent-magnetic material has good anisotropic permanent-magnetic performance and good mechanical and physical properties; the process flow is simple, namely the preparation for the anisotropic nano / amorphous complex phase block permanent-magnetic material can be finished by two steps; and the cost is low, and the consumption of rare-earth resources is lower.

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