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Technology for preparing permanent-magnet material

A permanent magnet material and rare earth technology, applied in the direction of magnetic properties of inorganic materials, can solve the problems of narrow application range and different brands of products cannot be used in general, and achieve the effects of improving sintering atmosphere, improving stability and consistency, and improving vacuum degree.

Inactive Publication Date: 2004-06-02
潘树明
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

They all propose to adopt two-stage heat treatment, which not only has a narrow application range, but also cannot be used universally for different brands of products.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0014] Instance 1, press Nd 13 Fe 80.98 B 6 CI 0.02 The formula requires the alloy to be prepared, and the alloy material is put into the intermediate frequency induction furnace, and the vacuum is evacuated to 10 -5 After torr, smelting under the protection of argon, after refining for 8 minutes, the temperature was slightly lowered, and poured into a water-cooled crystallizer. The obtained alloy ingots are pulverized to 3-5 microns (under the protection of nitrogen) by coarse, medium and fine powders and formed in a magnetic field with a forming pressure of 2T / cm 2 , the formed blank is put into the sintering furnace, and a getter is placed around the blank, and the total amount of the getter is 2.5% of the blank to be sintered. The getter consists of Zr 84 Al 16 It is composed of La, Ce, Pr, Nd, and mixed rare earth powder. Close the furnace door and evacuate. When the vacuum degree reaches 10 -1 Power up the temperature while holding it up. When the temperature rise...

example 2

[0018] Instance 2, press Nd 13.1 Fe 80.77 B 6.11 Cl 0.03 The formula requires the alloy to be prepared. The alloy material is melted in a medium-frequency induction furnace, refined in an argon gas protection for 7 minutes, and poured in a water-cooled crystallizer. The obtained alloy ingot is crushed to 3-4 microns, (under nitrogen gas protection) , forming in a magnetic field, forming pressure 2T / cm 2 , the formed blank is put into the sintering furnace, and a getter is placed around the blank. The total amount of the getter is 2.8% of the blank to be singed, and the getter is composed of Zr 84 Al 16 (accounting for 60%) and La, Ce, Pr, Nd, Dy, Ho mixture (accounting for 40%) powder composition, close the furnace door, vacuumize, and the vacuum degree reaches 1O -4 When the power is turned on, the temperature rises. When the temperature rises to 1125°C and keeps for 2 hours, it drops to 900°C at a rate of 0.2-0.5°C / min, then rapidly cools to room temperature, and then h...

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Abstract

A technology for making high-performance permanent-magnet Nd-Fe-B-Cl material features that the raw blank is sintered in heat treating furnace containing gas sucking agent prepared from Zr84Al16 powder and mixed rare-earth powder through three treating stages and then cooled from 1000 to 90 deg.C at speed of 0.2-0.5 deg.C / min. Its advantages include high stability, magnetic performance and uniformity.

Description

technical field [0001] The invention relates to a method for manufacturing a permanent magnet material, in particular to a method for manufacturing a rare earth R-iron Fe-boron B-chlorine Cl permanent magnet material. Background technique [0002] The permanent magnet materials of rare earth transition group intermetallic compounds are RCo 5 system, Sm(Co Cu Fe Zr) z Department and in 1983, Sumitomo Corporation of Japan announced a kind of Nd 15 Fe 77 B 8 permanent magnet material. Various countries have done a lot of research and development work on this permanent magnet material, and adopted the powder metallurgy method, and the heat treatment system of this method is very important. Japan's patent-opening patent publication (No.46008, No.64733) announces its heat treatment system 1080 ℃ Xlh+600 ℃ X (0.5-12) h. Its magnetism: residual magnetic induction intensity Br = 12300Gs intrinsic coercive force; Hc = 121000e, maximum magnetic energy product (BH) max = 36.4MGOe,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/04C22C33/02H01F1/08
Inventor 潘树明
Owner 潘树明
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