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A high temperature and corrosion resistant single crystal magnetic powder and its preparation method and application

A corrosion-resistant and high-temperature-resistant technology, which is applied in the field of high-temperature-resistant and corrosion-resistant single crystal magnetic powder and its preparation, can solve the problems of irregular shape, easy oxidation, easy agglomeration, etc., and achieve the effect of simple operation

Active Publication Date: 2020-08-04
INST OF RESOURCES UTILIZATION & RARE EARTH DEV GUANGDONG ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the R prepared by the existing powder metallurgy technology 2 Fe 17 N 3 The particle size of the magnetic powder is too small and the shape is irregular, so it is easy to oxidize, not resistant to corrosion, and easy to agglomerate, which is not conducive to further improving the comprehensive performance of bonded magnets

Method used

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  • A high temperature and corrosion resistant single crystal magnetic powder and its preparation method and application
  • A high temperature and corrosion resistant single crystal magnetic powder and its preparation method and application
  • A high temperature and corrosion resistant single crystal magnetic powder and its preparation method and application

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preparation example Construction

[0031] The above-mentioned preparation method of high temperature and corrosion resistant single crystal magnetic powder may, for example, include the following steps: preparing raw material magnetic powder and then performing galvanizing treatment.

[0032] Wherein, preparing raw material magnetic powder may include the following steps:

[0033] The main alloy is smelted and cast into cast pieces. Specifically, the metal elements R, T, M1 and Cu are used as raw materials, and the chemical formula ratio R in the high temperature and corrosion resistant single crystal magnetic powder except Zn and N is used. a T 100-a-b-c-d-v M1 b Cu c Ingredients, induction melting under the protection of argon, the melt is cast into cast pieces (cast alloy flakes) using water-cooled copper rolls with a speed of 2-20m / s.

[0034] In some embodiments, when the rapid-solidifying ingot technology is used to prepare cast slabs, for example, the surface linear velocity of the copper roller can be controll...

Embodiment 1

[0062] Use pure Sm, pure Fe and pure Cu metals with a purity of 99.9% as raw materials, and prepare ingredients according to the following chemical formula: Sm 11.58 Fe 86.42 Al 1.00 Cu 1.00 (at%). Since Sm is easy to volatilize, add 10% more as compensation based on the theoretical value.

[0063] Put the prepared metal raw materials into an induction melting furnace and smelt in high purity Ar. Use induction to heat the alloy until the raw materials are completely melted and uniform. At this time, the temperature of the melt is about 1550°C. The water-cooled copper roll speed is used to prepare rapid-setting cast alloy flakes, and the surface line speed of the copper roll is 10m / s.

[0064] Place the cast alloy flakes in a corundum crucible, and conduct the first heat treatment for 30 min under the protection of argon at 950°C.

[0065] After cooling, place the cast alloy flakes at 200℃ in H 2 The medium treatment is 2h, and the hydrogen explosion treatment is carried out. The fu...

Embodiment 2

[0075] Use pure Sm, pure Fe and pure Cu metals with a purity of 99.9% as raw materials, and prepare ingredients according to the following chemical formula: Sm 11.58 Fe 86.42 Al 1.00 Cu 1.00 (at%). Since Sm is easy to volatilize, add 10% more as compensation based on the theoretical value.

[0076] Put the prepared metal raw materials into an induction melting furnace and smelt in high purity Ar. Use induction heating alloy until the raw material is completely melted and uniform. At this time, the temperature of the melt is about 1550°C. The water-cooled copper roll speed is used to prepare rapid-setting cast alloy flakes, and the surface line speed of the copper roll is 10m / s.

[0077] The cast alloy flakes are placed in a corundum crucible, and the first heat treatment is performed for 30 min under the protection of argon at 1000°C.

[0078] After cooling, place the cast alloy flakes at 200℃ in H 2 The medium treatment is 2h, and the hydrogen explosion treatment is performed. The...

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Abstract

The invention relates to a high-temperature corrosion-resistant single crystal magnetic powder, and a preparation method and an application thereof, and belongs to the technical field of rare earth permanent magnet materials. The composition of the magnetic powder is RaT100-a-b-c-d-VM1bCucZndNv. R is Sm, or the combination of Sm and rare earth elements other than Sm, 5 <= a <= 20; T is iron or iron and cobalt; M1 is at least one of Si, Al, Ni, Ti, V, Cr, Zr, Hf, Nb, Ta, Mn, Mo and W, 0.1<= b<= 5; 0.1 <= c <= 5; 0.1 <= d <= 20; 0.5 <= v <= 20. The magnetic powder has lower cost and higher coercivity, oxidation resistance, corrosion resistance and filling ratio. The preparation method comprises the following steps of: preparing raw material magnetic powder, and then performing zinc plating treatment. The method is simple and the obtained magnetic powder can be used to prepare anisotropic bonded permanent magnets and anisotropic sintered magnets.

Description

Technical field [0001] The invention belongs to the technical field of rare earth permanent magnetic materials, and particularly relates to a high-temperature and corrosion-resistant single crystal magnetic powder and a preparation method and application thereof. Background technique [0002] At present, as an important basic material in modern society, rare earth permanent magnets are widely used in industries such as computers, automobiles, instruments, meters, household appliances, petrochemicals, medical care, and aerospace. [0003] Among them, Sm 2 Fe 17 N x With Nd(Fe,M) 12 N x It is considered a candidate for the next generation of rare earth permanent magnets. But the R prepared by the existing powder metallurgy technology 2 Fe 17 N 3 The particle size of the magnetic powder is too small and the shape is irregular, so it is easy to oxidize, not resistant to corrosion, and easy to agglomerate, which is not conducive to further improving the comprehensive performance of the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/055H01F41/02
CPCH01F1/0552H01F41/026
Inventor 卢赐福唐仁衡周庆
Owner INST OF RESOURCES UTILIZATION & RARE EARTH DEV GUANGDONG ACAD OF SCI