Method for preparing high-performance samarium-iron-nitrogen permanent magnet material with high nitriding efficiency

A permanent magnet material and high-performance technology, which is applied in the fields of magnetic materials, magnetic objects, inductors/transformers/magnets, etc., can solve the problems of SmFeN magnetic properties that cannot be achieved, poor alloy nitriding reaction kinetics, and increased temperature to increase nitrogen activity. and other problems, to achieve the effect of stable phase structure, low manufacturing cost, and improved nitriding efficiency

Active Publication Date: 2021-12-31
HANGZHOU PERMANENT MAGNET GRP
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  • Summary
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  • Application Information

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Problems solved by technology

High-purity samarium-iron alloys are currently prepared by methods, but for the Sm in the second step of nitriding treatment 2 Fe 17 The problem of poor nitriding reaction kinetics of alloys has not yet had a good solution in mass production, and its reaction kinetics is closely related to the nitriding environment; moreover, SmFeN will decompose at a high temperature

Method used

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  • Method for preparing high-performance samarium-iron-nitrogen permanent magnet material with high nitriding efficiency
  • Method for preparing high-performance samarium-iron-nitrogen permanent magnet material with high nitriding efficiency
  • Method for preparing high-performance samarium-iron-nitrogen permanent magnet material with high nitriding efficiency

Examples

Experimental program
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Effect test

Embodiment 1

[0060] Put the samarium-iron alloy powder into a high-energy ball mill tank and flush nitrogen for preliminary nitriding treatment, and the samarium-iron alloy coarse powder (Sm 2 Fe 17 ), put into absolute ethanol, put in non-magnetic steel balls, fill with nitrogen, and the air pressure is 0.2MPa; according to the ball-to-material ratio of 10:1, carry out high-energy ball milling in a high-energy ball mill tank, the time is controlled at 3 hours, and the speed is controlled At 150-200r / min, the particle size of the samarium-iron alloy after preliminary nitriding treatment is 1-50 microns;

[0061] The samarium-iron alloy powder obtained from the preliminary treatment is classified and screened, and the screening and classification are 300-2000 meshes, and are divided into four grades according to the particle size. The particle size range of the first grade is 30-48 microns; the particle size range of the second grade is 10-20 microns; The particle size range of the third s...

Embodiment 2

[0073] Putting the samarium-iron alloy powder into a high-energy ball mill tank and flushing with nitrogen gas for preliminary nitriding treatment (the treatment method is the same as in Example 1), the particle size of the samarium-iron alloy after the preliminary nitriding treatment is 1 to 50 microns;

[0074] The samarium-iron alloy powder obtained from the preliminary treatment is classified and screened, and the screening and classification are 300-2000 meshes, and are divided into four grades according to the particle size. The particle size range of the first grade is 30-48 microns; the particle size range of the second grade is 10-20 microns; The particle size range of the third stage is 5-10 microns; the particle size range of the fourth stage is 0-5 microns; different stages of samarium-iron alloy powders are respectively loaded into fine-hole troughs with different meshes, and loaded into four corresponding meshes. Number of fine-hole troughs;

[0075] The above-me...

Embodiment 3

[0085] Putting the samarium-iron alloy powder into a high-energy ball mill tank and flushing with nitrogen gas for preliminary nitriding treatment (the treatment method is the same as in Example 1), the particle size of the samarium-iron alloy after the preliminary nitriding treatment is 1-50 μm;

[0086] The samarium-iron alloy powder obtained from the preliminary treatment is classified and screened, and the screening and classification are 300-2000 meshes, and are divided into four grades according to the particle size. The particle size range of the first grade is 30-48 microns; the particle size range of the second grade is 10-20 microns; The particle size range of the third stage is 5-10 microns; the particle size range of the fourth stage is 0-5 microns; different stages of samarium-iron alloy powders are respectively loaded into fine-hole troughs with different meshes, and loaded into four corresponding meshes. Number of fine-hole troughs;

[0087] The above-mentioned ...

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Abstract

The invention provides a method for preparing a high-performance samarium-iron-nitrogen permanent magnet material with high nitriding efficiency, which comprises the following steps of: classifying and screening samarium-iron alloy powder, pumping a tower-type vacuum nitriding furnace to low vacuum of 1*10<-3> Pa by using a vacuum pump, and continuously filling high-speed high-purity nitrogen gas flow from the bottom of the tower-type vacuum nitriding furnace for nitriding treatment. According to the method for preparing the high-performance samarium-iron-nitrogen permanent magnet material with the high nitriding efficiency, the SmFe alloy powder is scoured through the nitrogen flow, so that the SmFe alloy powder can make full contact with nitrogen, and the nitriding efficiency is improved; and further, classified screening is carried out, so that the SmFe alloy powder in the trough is in the optimal nitriding size, and subsequent nitriding treatment is facilitated. According to the method, after nitriding is completed, the SmFeN alloy powder is high in nitrogen content, stable in phase structure, few in impurity and excellent and stable in magnetic performance; and moreover, the raw material quantity for nitriding treatment each time is large, the manufacturing cost is low, and the economic benefit conversion rate is high.

Description

technical field [0001] The invention belongs to the technical field of permanent magnet materials, in particular to a method for preparing high-performance samarium-iron-nitride permanent magnet materials with high nitriding efficiency. Background technique [0002] With the rapid development of science and technology, especially in the automotive, aerospace and other fields, there are stricter requirements for various materials under various extreme environmental conditions. As the most important functional material, permanent magnets are increasingly used in the fields of national economy and science and technology. Nd-Fe-B rare earth permanent magnets have excellent magnetic properties and good mechanical properties, but are expensive, which greatly limits their use at high temperatures. In 1990, Coey et al. used the gas-solid phase reaction to prepare the intermetallic compound R 2 Fe 17 N x , where Sm 2 Fe 17 N x The excellent magnetic properties have attracted w...

Claims

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Application Information

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IPC IPC(8): H01F1/059H01F41/02
CPCH01F1/059H01F41/0253H01F41/0293
Inventor 赵宇涂元浩何馨怡于京京徐道兵梁鹏
Owner HANGZHOU PERMANENT MAGNET GRP
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