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A kind of method for preparing samarium iron alloy

A technology of samarium-iron alloy and iron halide, which is applied in the field of preparation of samarium-iron alloy, can solve the problems of high cost of samarium-iron alloy, high content of oxygen and calcium, difficult separation of slag and gold, and achieve low price, simple process and good effect of impurity separation

Active Publication Date: 2021-05-07
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the deficiencies in the prior art, the present invention aims to provide a method for preparing samarium-iron alloy, which avoids the process of preparing high-purity samarium metal, thereby overcoming the high cost of preparing samarium-iron alloy, long process flow, high oxygen and calcium content, and slag gold Difficult to separate

Method used

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  • A kind of method for preparing samarium iron alloy
  • A kind of method for preparing samarium iron alloy

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Embodiment 1

[0025] A method for preparing samarium-iron alloy, comprising the steps of:

[0026] S1. Mixing materials: prepare anhydrous samarium fluoride, metal iron, reducing agent metal calcium, metal Zr, and metal Cu in proportion, wherein the molar ratio of Sm:Fe is 1:7.74, and Zr accounts for 0.25wt% of the samarium-iron alloy. Cu accounts for 2.5wt% of the samarium-iron alloy, and metal calcium is 105% of the theoretical mass; the raw materials are mixed uniformly and placed in a crucible;

[0027] S2. Preparation of samarium-iron alloy: put the crucible in step S1 in a vacuum induction furnace, use argon as the reaction protection gas, heat up to the temperature required for the reaction to 1200°C, keep the metal and slag in a molten state, stop heating after 20 minutes of reaction, and pour After cooling, slag and gold are separated, and finally samarium-iron alloy is obtained.

[0028] The impurity content of the samarium-iron alloy prepared in this embodiment is shown in Table...

Embodiment 3

[0031] The samarium-iron alloy impurity content prepared by the embodiment 3 of table 3

[0032] project oxygen content calcium content content 0.05％ 0.035％

Embodiment 2

[0034] A method for preparing samarium-iron alloy, comprising the steps of:

[0035] S1. Mixing materials: prepare anhydrous samarium chloride, ferric chloride, reducing agent calcium hydride, and nickel chloride in proportion, wherein the molar ratio of Sm:Fe is 1:5.6, and nickel chloride accounts for 1% of the samarium-iron alloy based on nickel. 0.5 wt%, calcium hydride is 130% of the theoretical mass, calcium hydride includes the part of reducing samarium chloride, ferric chloride and nickel chloride; mix each raw material evenly and put it in a crucible;

[0036] S2. Preparation of samarium-iron alloy: put the crucible in step S1 into a vacuum induction furnace, use inert gas argon as the reaction protection gas, heat up to the temperature required for the reaction to 1400°C, keep the metal and slag in a molten state, and stop the reaction after 10 minutes Heating, pouring and cooling, separation of slag and gold, and finally obtaining samarium-iron alloy.

[0037] The i...

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Abstract

The invention discloses a method for preparing samarium-iron alloy, which comprises the following steps: S1, mixing materials: preparing raw materials in proportion, the raw materials include anhydrous samarium halide, metallic iron or anhydrous iron halide, and reducing agent; wherein anhydrous halide The dosage ratio of samarium, metallic iron or anhydrous iron halide is determined according to the stoichiometric requirements of samarium iron alloy, and the reducing agent is used to reduce anhydrous samarium halide, and when anhydrous iron halide is used to reduce said anhydrous iron halide; each raw material After mixing evenly, put it in a crucible; S2, preparation of samarium-iron alloy: put the crucible in step S1 in a vacuum induction furnace, use an inert gas as a reaction protection gas, and raise the temperature to a reaction temperature of 1200-1600°C to keep the metal and slag In a molten state, stop heating after 3-20 minutes of reaction, pour and cool, separate slag and gold, and finally obtain samarium-iron alloy. The invention avoids the process of preparing high-purity samarium metal, thereby overcoming the problems of high cost of preparing samarium-iron alloy, long process flow, high content of oxygen and calcium, difficult separation of slag and gold, and the like.

Description

technical field [0001] The invention relates to the technical field of rare earth permanent magnet materials, in particular to a method for preparing samarium-iron alloy. Background technique [0002] Since 1990, Coey et al. have synthesized the interstitial intermetallic compound R by gas-solid reaction. 2 Fe 17 N x Since, Sm 2 Fe 17 N x The compound has drawn much attention from the magnetic community. The study found that Sm 2 Fe 17 N 3 The compound has excellent intrinsic magnetic properties, and the Curie temperature reaches 750K, which is higher than that of Nd 2 Fe 14 B is about 160K higher, and the magnetocrystalline anisotropy field H A 11200kA / m (about 14T), reaching Nd 2 Fe 14 Twice that of B, the upper limit of the theoretical magnetic energy product is 450kJ / m 3 , with Nd 2 Fe 14 B is equivalent, and the thermal stability, oxidation resistance and corrosion resistance of its magnets are better than those of NdFeB magnets. [0003] So far, Sm 2 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/00C22C33/04
CPCC22C33/04C22C38/002C22C38/005
Inventor 杨幼明刘东辉张小林牛飞杨诗旻李棉李柳魏庭民付春燕
Owner JIANGXI UNIV OF SCI & TECH