A heat-resistant NdFeB material and its preparation method

A neodymium-iron-boron and heat-resistant technology is applied in the field of heat-resistant neodymium-iron-boron materials and preparation, which can solve the problem of low use temperature of materials, and achieve the effects of improving heat resistance, reducing costs, and improving magnetic properties.

Inactive Publication Date: 2014-10-15
SHANXI SANYIQIANG MAGNETIC IND +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use temperature of the obtained material is not high

Method used

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  • A heat-resistant NdFeB material and its preparation method
  • A heat-resistant NdFeB material and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The preparation method of heat-resistant NdFeB material of the present invention, the concrete steps of this method are as follows:

[0029] 1) Preparation of praseodymium neodymium scandium alloy:

[0030] The praseodymium-neodymium waste material is mixed in hydrochloric acid with a mass concentration of 25%, and the mass ratio of the praseodymium-neodymium waste material and hydrochloric acid is 1: 2.0; then oxalic acid is added into the hydrochloric acid mixed solution and stirred evenly, and the weight ratio of the oxalic acid and the hydrochloric acid mixed solution is 2.5: 1. After 1 hour, collect the precipitate and place it in an oven at 120°C for 1 hour before taking it out; then place it in a box furnace at 1100°C for 1 hour to obtain precipitated rare earth oxides;

[0031] Determination of the content of neodymium, praseodymium and scandium on the precipitated rare earth oxide, after the measurement, add praseodymium oxide powder, neodymium oxide powder and...

Embodiment 2

[0038] The preparation method of heat-resistant NdFeB material of the present invention, the concrete steps of this method are as follows:

[0039] 1) Preparation of praseodymium neodymium scandium alloy:

[0040] The praseodymium neodymium waste is placed in hydrochloric acid with a mass concentration of 30% and mixed, and the mass ratio of the praseodymium neodymium waste to hydrochloric acid is 1: 2.3; then oxalic acid is added to the hydrochloric acid mixture and stirred evenly, and the weight ratio of oxalic acid to hydrochloric acid mixture is 2.5: 1. After 2 hours, collect the precipitate and place it in an oven at 120°C for 1 hour before taking it out; then place it in a box furnace at 1100°C for 1.5 hours to obtain precipitated rare earth oxides;

[0041] Determination of the content of neodymium, praseodymium and scandium on the precipitated rare earth oxide, after the measurement, add praseodymium oxide powder, neodymium oxide powder and scandium oxide powder to the...

Embodiment 3

[0048] The preparation method of heat-resistant NdFeB material of the present invention, the concrete steps of this method are as follows:

[0049] 1) Preparation of praseodymium neodymium scandium alloy:

[0050] The praseodymium neodymium waste is placed in hydrochloric acid with a mass concentration of 28% and mixed, and the mass ratio of the praseodymium neodymium waste to hydrochloric acid is 1: 2.2; then oxalic acid is added to the hydrochloric acid mixture and stirred evenly, and the weight ratio of oxalic acid to hydrochloric acid mixture is 2.5: 1. After 1 hour, collect the precipitate and place it in an oven at 120°C for 1 hour before taking it out; then place it in a box furnace at 1055°C for 1.5 hours to obtain precipitated rare earth oxides;

[0051] Determination of the content of neodymium, praseodymium and scandium on the precipitated rare earth oxide, after the measurement, add praseodymium oxide powder, neodymium oxide powder and scandium oxide powder to the ...

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Abstract

The invention provides a heat-resistant neodymium-iron-boron material and a preparation method thereof. The material not only has good magnetism, but also has high heat resistance. The preparation method has simple process, low production cost and is suitable for industrialized production. The weight percentage of the heat-resistant NdFeB material is: Nd21-24%, Pr7-8%, B1-2%, Ir0.07-0.08%, Rh0.07-0.08%, Sc0.7-0.8 %, the rest is Fe.

Description

technical field [0001] The invention belongs to the field of functional materials, and relates to a heat-resistant NdFeB material and a preparation method. Background technique [0002] Application No. 200910003955.1 relates to a method for making NdFeB permanent magnet materials from NdFeB powder waste, which belongs to the field of rare earth magnetic material preparation. The raw material is powder waste produced in the production process of NdFeB NdFeB, or oxidized solid waste, wherein the oxidized solid waste is broken into powder with a particle size of <10 μm; the process steps are as follows: 1) Powder waste treatment: use heating method Remove the oil and moisture in the powder waste; 2) Fluorination treatment of the powder: put the dried powder waste into a sealed container, feed fluorine gas at 400-600°C, make the pressure reach 1-2kpa, and keep 1 -3 hours, fully deoxidize to obtain fluoride powder; 3) smelting of thick NdFeB NdFeB alloy: mix fluoride powder: ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/00C22C33/02
Inventor 孙锐卢俊丽
Owner SHANXI SANYIQIANG MAGNETIC IND
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