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Bonded rare earth GMM preparing method

A technology of giant magnetostriction and preparation process, which is applied in the fields of magnetic materials, inductor/transformer/magnet manufacturing, magnetic objects, etc., can solve the problems of low resistivity and brittleness of rare earth giant magnetostrictive materials, etc., and improve the resistivity. , High material utilization rate, and the effect of reducing eddy current loss

Inactive Publication Date: 2010-05-12
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, rare earth giant magnetostrictive materials made by directional solidification have the disadvantages of high brittleness and low resistivity, and powder metallurgy can solve some of these problems

Method used

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  • Bonded rare earth GMM preparing method
  • Bonded rare earth GMM preparing method
  • Bonded rare earth GMM preparing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] will be composed as (Tb 0.3 Dy 0.7 )Fe 2.0 The directional solidification raw materials, small ball mill, -28-mesh sieve, acetone and other required items are put into the glove box, and the door is closed. In order to prevent the gloves from being pulled out, the sealing cover must be closed. Then extract the air inside. When the vacuum reaches 10 -2 Pa, stop vacuuming. Then it was filled with argon gas for cleaning, and then vacuumized, and this operation was repeated twice. Take off the sealing cover, put the items in and out of the bin through gloves and put them into the glove box, perform powder making, sieving, weighing and other operations in the glove box, and then put the prepared powder into a container containing acetone middle. Weigh 1% epoxy resin and 0.1% silane by weight of the powder and mix them uniformly with the powder. Put the mixed powder into the mold and carry out preliminary forming in the magnetic field press. The vertical magnetic field...

Embodiment 2

[0021] will be composed as (Tb 0.3 Dy 0.7 )Fe 2.0 The directional solidification raw materials, small ball mill, -80-mesh sieve, acetone and other required items are put into the glove box, and the door is closed. In order to prevent the gloves from being pulled out, the sealing cover must be closed. Then extract the air inside. When the vacuum reaches 10 -3 Pa, stop vacuuming. Then it was filled with argon gas for cleaning, and then vacuumized, and this operation was repeated 3 times. Take off the sealing cover, put the items in and out of the bin through gloves and put them into the glove box, perform powder making, sieving, weighing and other operations in the glove box, and then put the prepared powder into a container containing acetone middle. Weigh 3% epoxy resin and 0.2% silane by weight of the powder and mix them uniformly with the powder. Put the mixed powder into the mold for preliminary forming in a magnetic field press, and the applied vertical magnetic fie...

Embodiment 3

[0023] will be composed as (Tb 0.3 Dy 0.7 )Fe 1.95 The directional solidification raw materials, small ball mill, -325 mesh sieve, acetone and other required items are put into the glove box. The warehouse door is closed. In order to prevent the gloves from being pulled out, the sealing cover must be closed. Then extract the air inside. When the vacuum reaches 10 -3 Pa, stop vacuuming. Then fill in argon gas for cleaning, and then perform vacuuming again, and repeat the operation 3 times. Remove the sealing cover, and put the items in and out of the bin into the glove box through gloves. Carry out powder making, sieving, weighing and other operations in the box, and then put the prepared powder into a container with acetone. Weigh 2% epoxy resin and 2% silane by weight of the powder and mix it evenly with the powder. The mixed powder is put into a mold for preliminary forming in a magnetic field press, and the applied vertical magnetic field is 2T. After taking out the com...

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Abstract

The preparation technique for a bonding rare-earth ultra-magnetostrictive material comprises: with material, a sieve and a small ball mill in glove box, vacuumizing on protection of inert gas; weighing proper bonding agent and coupling agent by intergradient proportion to mix with the powder for cold isostatic press; curing the blank to obtain the final product. This invention has high usage on material, and can prepare the product with large scale, complex shape and super properties.

Description

technical field [0001] The invention belongs to the technical field of rare earth permanent magnet material preparation, and in particular provides a preparation process of bonded rare earth giant magnetostrictive material. Background technique [0002] The magnetostriction of rare earth giant magnetostrictive materials is about 2 orders of magnitude higher than that of traditional magnetostrictive materials such as Ni, Co, Fe and their alloys, and the room temperature performance is better. In the 1960s, it was discovered that rare earth elements have many unique magnetic properties. In 1963, Legvold et al. found that the magnetostriction of rare earth metals terbium (Tb) and dysprosium (Dy) at low temperatures is 100-1000 times that of traditional magnetostrictive materials. times, but their ordering temperature is very low. In the early 1970s, people began to study giant magnetostrictive materials that can work at room temperature. In 1972, A.E.Clark discovered TbFe 2 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F41/00H01F1/053B22F3/02
Inventor 张深根曲选辉左志军田建军秦明礼汪志广何新波李平段柏华
Owner UNIV OF SCI & TECH BEIJING
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