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A kind of permanent magnet material with high compressive strength and preparation method thereof

A technology of permanent magnetic materials and compressive strength, applied in the direction of magnetic materials, magnetic objects, electrical components, etc., can solve problems such as insufficient compressive strength, achieve the effects of improving the pinning field H, quality control in place, and increasing the use temperature

Inactive Publication Date: 2015-08-05
SHANXI SANYIQIANG MAGNETIC IND +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The bending strength is 289-319MPa, but its compressive strength is only 1030-1070Mpa, the compressive strength is insufficient

Method used

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  • A kind of permanent magnet material with high compressive strength and preparation method thereof
  • A kind of permanent magnet material with high compressive strength and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The weight composition of the permanent magnet material of the present invention is as follows: 14.4% neodymium, 3.6% praseodymium, 1% boron, 0.036% tungsten, 1% niobium, 0.012% rhenium, 0.036% scandium, and the rest is iron.

[0027] The preparation process is as follows:

[0028] (1) Preparation of neodymium-praseodymium-scandium alloy:

[0029] a. Preparation of precipitated rare earth oxides: place the Nd waste material in hydrochloric acid with a mass concentration of 25%, and the mass ratio of the Nd waste material to the hydrochloric acid is 1:2.3. Then add oxalic acid to the hydrochloric acid mixture and mix for 1.5 hours. The weight ratio of oxalic acid to the mixture of praseodymium and neodymium waste and hydrochloric acid is 2.5:1. After filtering, the collected precipitate was kept in an oven at 120° C. for 1 hour and then taken out. Then place it in a box furnace at 1050° C. for 1.5 hours to obtain precipitated rare earth oxides.

[0030] b. Prepar...

Embodiment 2

[0036] The weight composition of the permanent magnet material of the present invention is as follows: 24% neodymium, 6% praseodymium, 5% boron, 0.06% tungsten, 3% niobium, 0.02% rhenium, 0.06% scandium, and the rest is iron.

[0037] The preparation process is as follows:

[0038] (1) Preparation of neodymium-praseodymium-scandium alloy:

[0039] a. Preparation of precipitated rare earth oxides: placing the Nd waste material in hydrochloric acid with a mass concentration of 30%, and the mass ratio of the Nd waste material to the hydrochloric acid is 1:2.0. Then oxalic acid was added to the hydrochloric acid mixture and mixed for 2 hours. The weight ratio of oxalic acid to the mixture of praseodymium and neodymium waste and hydrochloric acid is 2.5:1. After filtering, the collected precipitate was kept in an oven at 120° C. for 1 hour and then taken out. Then place it in a box furnace at 1100° C. for 1 hour to obtain precipitated rare earth oxides.

[0040] b. Preparat...

Embodiment 3

[0046] The weight composition of the permanent magnet material of the present invention is as follows: 20% neodymium, 5% praseodymium, 3% boron, 0.048% tungsten, 2% niobium, 0.016% rhenium, 0.05% scandium, and the rest is iron.

[0047] The preparation process is the same as in Example 1.

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Abstract

The invention discloses a permanent magnet material with high pressure resisting intensity and a preparation method of the permanent magnet material with high pressure resisting intensity. The permanent magnet material with high pressure resisting intensity comprises, by weight, 14.4-24% of neodymium, 3.6-6% of praseodymium, 1-5% of boron, 0.036-0.06% of wolfram, 1-3% of niobium, 0.012-0.02% of rhenium, 0.036-0.06% of scandium, and the rest is ferrum, wherein the weight ratio among neodymium, praseodymium and wolfram is 4:1:0.01, and the weight ratio between wolfram and rhenium is 3:1. Due to the fact that permanent magnet material with high pressure resisting intensity utilizes neodymium and praseodymium waste to directly generate raw material of an alloy, composition proportion is flexible, quality is well controlled, and cost can be reduced, process is simple, powder waste high in oxygen content is fully utilized, environment is protected and effectively improved, and high social value is possessed.

Description

technical field [0001] The invention relates to a permanent magnet material and a preparation method thereof, in particular to an NdFeB permanent magnet material with high compressive strength. Background technique [0002] Rare earth resources are strategic resources and non-renewable resources. With the sharp increase in the demand for rare earths in color developers, magnets and electronics industries, it is particularly important to reasonably and effectively improve the utilization of rare earth resources. Using NdFeB waste to recover rare earth elements is one of the important means. Moreover, the use of NdFeB waste to recover rare earth elements has many advantages, such as shortened procedures, reduced costs, and reduced "three wastes" compared with the use of ore to produce rare earth products. At present, the main sources of NdFeB waste are: (1) the furnace pool produced by vacuum smelting, the ultrafine powder produced in the milling process, and the grinding...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/057B22D11/06B22F3/16
Inventor 孙锐卢俊丽
Owner SHANXI SANYIQIANG MAGNETIC IND
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