High-performance rare-earth-iron-based giant magnetostrictive material and preparation method thereof

A giant magnetostrictive, high-performance technology, applied in the field of magnetic functional materials, can solve the problems of serious volatilization of rare earth elements and many internal defects in the material, and achieve the effects of excellent magnetostrictive performance, improved magnetostrictive performance, and precise control.

Inactive Publication Date: 2018-05-11
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, even under directional solidification conditions, the crystal orientation of polycrystalline rods is concentrated in the , or direction; in order to achieve a high temperature gradient, the rare earth elements are volatilized severely, resulting in a large number of acicular Wei It is difficult to give full play to the magnetostrictive potential of the material because of the many internal defects of the material.

Method used

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  • High-performance rare-earth-iron-based giant magnetostrictive material and preparation method thereof
  • High-performance rare-earth-iron-based giant magnetostrictive material and preparation method thereof
  • High-performance rare-earth-iron-based giant magnetostrictive material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The device structure of a method for preparing high-performance rare earth-iron-based giant magnetostrictive materials is as follows figure 1 As shown, it includes a strong magnet 1, a heating furnace, and a crucible 9. The heating body 11 of the heating furnace is fixed in the cavity inside the strong magnet through a support frame. The heating furnace also includes a water inlet 3 and a water outlet 7 of the water cooling jacket, heat insulation Layer 10, heat insulation layer 13, and the sample is placed in the crucible 9;

[0036] The temperature-measuring thermocouples 5 and 22 are respectively connected to the bottom of the heating body and the top of the crystallizer, and the other ends of the temperature-measuring thermocouples 5 and 22 are connected to the temperature acquisition system 23;

[0037] The temperature control thermocouple 6 is inserted into the heating furnace to be attached to the insulation layer 10, and placed in the center of the heating body,...

Embodiment 2

[0047] A device for preparing a method for high-performance rare earth-iron-based giant magnetostrictive material is the same as in Example 1;

[0048] Using the device in Example 1, the preparation method is carried out in the following steps:

[0049] Prepare Tb-Dy-Fe master alloy by smelting, the atomic ratio is Tb:Dy:Fe=0.3:0.7:2;

[0050] Put the Tb-Dy-Fe master alloy in the alumina crucible, and evacuate the heating furnace to a vacuum degree of ≤10 -3 Pa, argon gas is introduced to a pressure of 0.02MPa; 60T is applied to the Tb-Dy-Fe master alloy 2 / m gradient strong magnetic field, under the condition of argon protection and gradient strong magnetic field, heat the Tb-Dy-Fe master alloy to the liquid state (1350 ° C), and keep it for 12 minutes;

[0051] After the heat preservation is over, the liquid Tb-Dy-Fe master alloy is pulled into the GaInSn cooling liquid at a stretching rate of 25 μm / s to achieve directional solidification, and obtain a Tb-Dy-Fe magnetostri...

Embodiment 3

[0054] A device for preparing a method for high-performance rare earth-iron-based giant magnetostrictive material is the same as in Example 1;

[0055] Using the device in Example 1, the preparation method is carried out in the following steps:

[0056] Prepare Tb-Dy-Fe master alloy by smelting, the atomic ratio is Tb:Dy:Fe=0.35:0.65:1.94;

[0057] Put the Tb-Dy-Fe master alloy in the boron nitride crucible, and evacuate the heating furnace to a vacuum degree of ≤10 -3 Pa, argon gas is introduced to a pressure of 0.03MPa; 40T is applied to the Tb-Dy-Fe master alloy 2 / m gradient strong magnetic field, under the condition of argon protection and gradient strong magnetic field, heat the Tb-Dy-Fe master alloy to the liquid state (1350 ° C), and keep it for 8 minutes;

[0058] After the heat preservation is over, the liquid Tb-Dy-Fe master alloy is drawn into the GaIn cooling liquid at a stretching rate of 15 μm / s to achieve directional solidification and obtain a Tb-Dy-Fe magne...

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Abstract

The invention discloses a high-performance rare-earth-iron-based giant magnetostrictive material and a preparation method thereof, and belongs to the technical field of magnetic functional materials.The method comprises the following steps that 1, induction smelting is carried out on a (TB1-XMX) fey alloy, M is equal to at least one of Dy, Sm, Ce, Pr, Nd, Ho and Er, X is equal to 0 to 0.70, and Yis equal to 1.75-2.25; 2, the alloy is placed in an inert gas and gradient strong magnetic field environment, and the alloy is at least heated to 150 DEG C above the liquidus temperature, and the temperature is kept for at least 8 minutes; and 3, the rate of 5-120 microns per second is taken, then an alloy liquid is pulled into a liquid metal cooling liquid to achieve directional solidification,and after the temperature of a heating chamber is cooled to the room temperature, the sample is taken out. The prepared magnetostrictive material has the advantages of high mechanical property, the large magnetostriction coefficient and the like; and the method has the advantages that operation is simple, control is accurate, the product performance is excellent, and the high-performance magnetostriction material can be produced in batches.

Description

technical field [0001] The invention relates to a polycrystalline rare earth-iron-based giant magnetostrictive material with compact structure, functional phases oriented along the <111> direction, and crystals regularly arranged along the use direction and a preparation method thereof, belonging to the technical field of magnetic functional materials. Background technique [0002] At the end of the 1960s, Callen proposed that rare earth-iron compounds (such as Tb-Fe and Tb-Dy-Fe alloys) would have a higher magnetostriction coefficient, and the magnetostriction coefficient of this type of alloy can reach 1500-2200ppm , 5-25 times that of piezoelectric ceramics and 40-50 times that of nickel-based alloys, so it is called "giant magnetostrictive material". Compared with traditional magnetostrictive materials and piezoelectric ceramics, rare earth-iron-based giant magnetostrictive materials have low magnetocrystalline anisotropy, large strain, high energy density, wide fr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C22C33/06B22D27/02B22D27/04
CPCC22C38/005B22D27/02B22D27/045C22C33/06
Inventor 刘铁董蒙王强高鹏飞苑轶
Owner NORTHEASTERN UNIV
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