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Low-cost permanent magnet prepared from misch metal (MM) and preparation method thereof

A mixed rare earth, low-cost technology, used in magnetic objects, permanent magnets, magnetic materials, etc., can solve problems such as difficulties, and achieve the effect of ensuring magnetic performance, realizing cost control, and optimizing magnetic performance.

Active Publication Date: 2013-04-10
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The second is to find a new high-performance magnet to replace the rare earth permanent magnet; this part of the research is now difficult, and it is difficult to find a high-performance magnet that can be comparable to NdFeB, which can use cheap and abundant Fe and A very small amount of B achieves excellent comprehensive magnetic properties

Method used

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Examples

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Effect test

preparation example Construction

[0020] The steps of the preparation method of the low-cost permanent magnet prepared by using mixed rare earth MM are as follows:

[0021] 1) Ingredients, the raw materials used are mixed rare earth metals MM, with a purity greater than 99.5% of neodymium, iron, niobium, vanadium, titanium, cobalt, chromium, molybdenum, manganese, nickel, gallium, zirconium, tantalum, silver, gold, Aluminum, lead, copper and silicon, boron is added in the form of ferroboron;

[0022] 2) Melting and quick-setting scale ingot casting ， The alloy is smelted by vacuum medium frequency induction and cast ingots of quick-setting scales to make thick strips. Firstly, the prepared raw materials are put into a clean crucible, and then the crucible is put into a medium frequency induction melting furnace for vacuum melting. After melting, the molten The metal liquid is poured onto the rotating water-cooled copper roller through the transition ladle, and the roller speed is 1~2 m / s to obtain a quick-set...

Embodiment 1

[0028] 1) Ingredients, the raw materials used are mixed rare earth metals MM, neodymium, iron, cobalt, aluminum and vanadium with a purity greater than 99.5%, boron is added in the form of boron-iron alloy, of which, in atomic percentage, 6.5% of MM , 8% Nd, 5% B, 0.2% Co, 1.5% Al, 0.2% V, and the balance is Fe. As shown in the table below:

[0029] Element MM Nd co Al V B Fe atomic ratio 6.5 8 0.2 1.5 0.2 5 margin raw material MM Nd co Al V B Fe Fe

[0030] When batching, first remove the oxide skin on the surface of the raw material, and then use an electronic balance to weigh the weight of various raw materials according to the nominal composition of the alloy;

[0031] 2) Melting and quick-setting scale ingot casting ， The alloy is smelted by vacuum medium frequency induction and cast ingots of quick-setting scales to make thick strips. Firstly, the prepared raw materials are put into a clean crucible, and then the cr...

Embodiment 2

[0037] 1) Ingredients, the raw materials used are mixed rare earth metals MM, neodymium, iron, molybdenum, copper, aluminum and niobium with a purity greater than 99.5%, boron is added in the form of boron-iron alloy, of which 4% of MM, 12 % Nd, 5.8% B, 0.3% Mo and Cu, 1.4% Al, 0.2% Nb, and the balance is Fe. As shown in the table below:

[0038] Element MM Nd Mo Cu Al Nb B Fe atomic ratio 4 12 0.3 0.3 1.4 0.2 5.8 margin raw material MM Nd Mo Cu Al Nb B Fe Fe

[0039] When batching, first remove the oxide skin on the surface of the raw material, and then use an electronic balance to weigh the weight of various raw materials according to the nominal composition of the alloy;

[0040] 2) Melting and quick-setting scale ingot casting ， The alloy is smelted by vacuum medium frequency induction and cast ingots of quick-setting scales to make thick strips. Firstly, the prepared raw materials are put into a clean crucible...

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Abstract

The invention discloses a low-cost permanent magnet prepared from misch metal (MM) and a preparation method thereof. An atomic fraction formula of the permanent magnet is MMxNdy(Fe1-zMz)100-x-y-wBw, wherein MM is misch metal, comprising the following components: more than 48% of Ce, 20-35% of La, 10-20% of Nd, 4-7% of Pr and the balance of Fe, Si, S and the like; M is one or more of Nb, V, Ti, Co, Cr, Mo, Mn, Ni, Ga, Zr, Ta, Ag, Au, Al, Pb, Cu and Si; x plus y is more than or equal to 14.5, but less than or equal to 17.5; x / y is more than or equal to 1 / 3, but less than or equal to 1; z is more than or equal to 0.1, but less than or equal to 5; and w is more than or equal to 5, but less than or equal to 8.5. The permanent magnet provided by the invention substitutes Nd by using a low-cost MM part, and a grain boundary improving element and an indissolvable element are matched and doped with Fe, so that the cost is reduced to meet a market demand on the premise of ensuring certain magnetic performance.

Description

technical field [0001] The invention relates to a low-cost permanent magnet prepared by using mixed rare earth MM and a preparation method thereof. Background technique [0002] Common permanent magnet materials in modern industry and technology include cast permanent magnet materials, ferrite permanent magnet materials, rare earth permanent magnet materials and other four categories. Among them, the third-generation rare earth permanent magnet material - NdFeB, because of its excellent comprehensive magnetic properties, is especially conducive to the miniaturization, light weight and thinning of instruments, and has become the core material of the modern information technology industry. Statistics show that the world's demand for NdFeB has risen from 30,000 tons in the 1980s to 120,000 tons in 2010 (the data in 2010 was also affected by the economic crisis); it is predicted that by 2015, the demand will The volume will increase to 200,000 tons. With the rapid growth of de...

Claims

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Application Information

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IPC IPC(8): H01F1/057H01F7/02H01F41/02B22F3/16
Inventor 严密金佳莹马天宇梁丽萍张培高翠
Owner ZHEJIANG UNIV
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