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High-performance dual-phase permaneng-magnet rare-earth material and its preparing process

A rare earth permanent magnet, high-performance technology, applied in the direction of magnetic materials, inorganic material magnetism, magnetic objects, etc., can solve the problems of far from theoretical values, affect application, decrease in coercive force, etc., and achieve simple and good equipment and process. The effect of corrosion resistance and low process cost

Inactive Publication Date: 2004-09-01
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Soft magnetic phase α-Fe and Fe 3 Although the addition of B increases the residual magnetization of the nano-two-phase permanent magnet, the coercive force also decreases with the addition of the soft magnetic phase, generally less than 450kA / m. Such a value affects its application at higher temperatures. especially when the magnet is thin
Moreover, due to the limitations of current scientific research methods, the crystal structure of magnetic powder is difficult to achieve the microstructure required in the theoretical model: the two-phase crystals are continuous, the size is about 10nm, there is no non-magnetic phase between the two phases, and they are completely coupled
Therefore, the magnetic properties of the material are not very ideal, and the highest magnetic energy product can only reach 158kJ / m -3 It is far from the theoretical value and cannot meet the requirements of high-performance magnets, all of which lead to the failure of this material to be widely used

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Using Fe, Nd, Co, Cr, Al and 16wt% B-Fe alloy with a purity of 99.9% as raw materials, according to Nd 12.3 Fe 67.8 co 10.8 Al 0.8 Cr 2.3 B 6 ratio, put it into the magnetic levitation melting furnace, and evacuate to 10 -5 Pa, then pass through 1.2×10 5 The high-purity argon gas of Pa is smelted three times under the protection of argon gas to ensure that the ingot with uniform composition is obtained. In order to ensure that the composition of the ingot basically meets the design composition, attention must be paid to the loss of rare earth elements during the smelting process. Under the protection of high-purity nitrogen, crush the ingot with a crusher, and then sieve the ingot powder with a particle diameter of less than 110 microns for high-energy ball milling. Under protective atmosphere, the sieved ingot powder and iron powder (99.9% in purity, particle size less than 15 microns) were evenly mixed, wherein the volume percentage of iron powder was 38%. Unde...

Embodiment 2

[0037] Using Fe, Nd, Dy, 16wt% B-Fe alloy with a purity of 99.9% as raw materials, according to Nd 8.5 Dy 1.2 Fe 84.3 B 6 ratio, put it into the magnetic levitation melting furnace, and evacuate to 10 -5 Pa, then pass through 1.2×10 5 The high-purity argon gas of Pa is smelted three times under the protection of argon gas to ensure that the ingot with uniform composition is obtained. In order to ensure that the composition of the ingot basically meets the design composition, attention must be paid to the loss of rare earth elements during the smelting process. Next, put the alloy ingot into a quartz tube with a small hole at the bottom and place it in the strip machine, and the vacuum degree in the cavity of the strip machine is 10 -5 Pa, the distance between the lower end of the quartz tube and the surface of the molybdenum roller is 0.5mm, the diameter of the nozzle at the lower end of the quartz tube is 0.4mm, and the jet pressure difference is 6.5×10 3 Pa, the heating...

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Abstract

This invention discloses a high performance two-phase rare-earth permanent-magnet material and its preparation method. The said material contains rare-earth elements 6.2-12.0at%, nitrogen 0.5-4.5at%, metalloid elements 2.5-6.0at% with B as the main factor and the remaining transition metal mainly with FE. The preparation method is first to prepare alloy by vacuum fusing then to prepare alloy powder by adopting quick quench or mechanical alloying combined with suitable heat processing techniques, finally to adhere, cold and hot press or warm distortion to prepare alloy magnet. The magnet powder and magnet has preferable comprehensive performance of permanent magnet with higher working temp. and anti-corrosion and less content of rare earths.

Description

technical field [0001] The invention relates to a high-performance dual-phase rare earth permanent magnet material and a preparation method thereof. Background technique [0002] Rare earth bonded magnet is a magnetic material made of magnetic rare earth alloy powder bonded with organic or soft metal binder. Rare earth bonded magnets have a high performance-price ratio, can be directly formed or processed into components with complex shapes, have high toughness, are not easy to break, crack, and have small deviations in magnetic properties, which meet the high performance requirements of magnetic materials in recent years. Therefore, its total sales have grown rapidly, with an average annual growth rate of 35%. The magnetic properties of rare earth bonded magnets are affected by the properties of the magnetic powder and the bonding density, among which the magnetic properties of the powder are considered to be the first factor. However, the compre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/053H01F1/08
Inventor 严密郑奋勇杨德仁舒康颍王晨胡军张苏凯
Owner ZHEJIANG UNIV
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