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Low-temperature nitridation preparation method of iron-based rare earth permanent magnet powder

A rare earth permanent magnet, low temperature nitriding technology, applied in the direction of magnetic objects, magnetic materials, coatings, etc., can solve the problems of low performance, not very strong anisotropy, etc., to achieve the effect of reducing the nitriding temperature

Inactive Publication Date: 2012-12-12
HEBEI UNIV OF ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Sm prepared by reduction diffusion method 2 Fe 17 N x After the magnetic powder is made into a bonded magnet, the anisotropy is not very strong, and the performance is low

Method used

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  • Low-temperature nitridation preparation method of iron-based rare earth permanent magnet powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Smelting Sm with pure samarium and pure iron in a vacuum induction furnace under the protection of Ar gas 2 Fe 17 After homogenization, the ingot obtained from the alloy is broken into powder particles with an average particle size of 40 μm; Sm 2 Fe 17 Alloy, compared with the rare earth permanent magnetic alloy raw material is 10: 1 weight ratio to put into φ4mm, φ8mm, φ12mm three kinds of ball milling steel balls with different particle sizes, the ratio of three kinds of steel balls is 10: 5: 1, add the Rare earth permanent magnetic alloy raw material weight is based on 15 parts by weight of oleylamine as a surfactant, adding heptane as a ball milling medium, after sealing, put it on a ball mill, and carry out high-energy ball milling for 2 hours with a motor speed of 1425rpm to obtain Sm 2 Fe 17 Rare earth permanent magnet nano flake powder, the prepared powder is filtered to remove the ball milling medium, and after vacuum drying, the nitriding treatment temperat...

Embodiment 2

[0035] Smelting Sm with pure samarium and pure iron in a vacuum induction furnace under the protection of Ar gas 2 Fe 17 After homogenization, the ingot obtained from the alloy is broken into powder particles with an average particle size of 40 μm; Sm 2 Fe 17 Alloy, compared to the rare earth permanent magnet alloy raw material is 30: 1 weight ratio into φ4mm, φ8mm, φ12mm three kinds of ball milling steel balls with different particle sizes, the ratio of the three kinds of steel balls is 15: 5: 1, adding Rare earth permanent magnet alloy raw material weight is based on 40 parts by weight of oleylamine as a surfactant, adding hexane as a ball milling medium, sealing it and putting it on a ball mill, and carrying out high-energy ball milling for 2 hours with a motor speed of 1425rpm to obtain Sm 2 Fe 17 Rare earth permanent magnet nano flake powder, the prepared powder is filtered to remove the ball milling medium, and after vacuum drying, the nitriding treatment temperature ...

Embodiment 3

[0038] Smelting Sm with pure samarium and pure iron in a vacuum induction furnace under the protection of Ar gas 2 Fe 17 After homogenization, the ingot obtained from the alloy is broken into powder particles with an average particle size of 40 μm; Sm 2 Fe 17 Alloy, compared with the rare earth permanent magnet alloy raw material is 10: 1 weight ratio to put into φ4mm, φ8mm, φ12mm three kinds of ball milling steel balls with different particle sizes, the ratio of three kinds of steel balls is 12: 5: 1, add the Rare earth permanent magnetic alloy raw material weight is based on 15 parts by weight of oleylamine as a surfactant, adding hexane as a ball milling medium, after sealing, put it on a ball mill, and carry out high-energy ball milling with a motor speed of 1425rpm for 6 hours to obtain Sm 2 Fe 17 Rare earth permanent magnet nano flake powder, the prepared powder is filtered to remove the ball milling medium, and after vacuum drying, the nitriding treatment temperature...

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Abstract

The invention discloses a low-temperature nitridation preparation method of iron-based rare earth permanent magnet powder. The method is characterized in comprising the steps that: (1) under Ar gas protection, Sm2Fe17 alloy is smelted by using pure samarium and pure iron in a vacuum induction furnace, such that an ingot is obtained; the ingot is subjected to a homogenization treatment, and is crushed into powdery particles with an average particle size smaller than 40mun; (2) a surfactant, grinding balls and the powdery particles are added into a ball milling tank; a ball milling medium is filled into the tank; and with the cooperation of the surfactant and high-energy ball milling, flaky powder with a nano-crystalline structure is obtained, wherein the surfactant is coated on the surface of the powder; (3) the powder is filtered, such that the ball milling medium is removed; and the powder is subjected to vacuum drying; and (4) the powder is subjected to a nitridation treatment under a low temperature of 300-400 DEG C. The microstructure of the obtained permanent magnet powder is nano-crystals with grain sizes of 8-20nm. The nano-sheet thickness is approximately 5-200nm, Hc is 5-14kOe, and (BH) max is 10-28MGOe. On the basis that an original structure and advantages are maintained, the nitridation temperature is greatly reduced. The nano-sheet powder can be prepared into a high-performance bonding magnet which can be used in fields such as motors and engines.

Description

technical field [0001] The invention relates to a low-temperature nitriding preparation method of iron-based rare earth permanent magnet powder. Background technique [0002] In 1990, Coey and Sun reported the synthesis of Sm by gas-solid phase reaction 2 Fe 17 N x Interstitial intermetallic compound, ternary rare earth Sm 2 Fe 17 N x Interstitial compounds have excellent intrinsic magnetic properties, high saturation magnetization J s =1.54T (NdFeB is 1.6T), high Curie temperature T c =475°C and high room temperature anisotropy field H a =14T, the easy magnetization direction is c-axis, its oxidation resistance and corrosion resistance are better than Nd 2 Fe 14 B, Visible, Sm 2 Fe 17 N x It is a potential permanent magnet material with practical significance, which has aroused great interest in the magnetic field. [0003] Currently, the preparation of Sm 2 Fe 17 N x The methods of magnetic powder mainly include: mechanical alloying method, rapid quenching ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/24B22F1/00C22C38/00C22C33/02H01F1/059
Inventor 郑立允赵立新
Owner HEBEI UNIV OF ENG
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