Magnetostrictive material and preparation method thereof

A magnetostrictive material and raw material technology, applied in the field of magnetic materials, can solve the problems of poor magnetostrictive performance and inability to meet the needs of use, and achieve the effects of complete solid solution, easy single crystal growth, and inhibition of nucleation

Active Publication Date: 2015-09-30
BEIHANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the thickness of polycrystalline strips prepared by the vacuum stripping process is only tens of microns, and the low-field (<500Oe) magnetostrictive properties of the strip samples are extremely poor (<50ppm) due to the special shape anisotropy, which cannot meet Magnetostrictive devices such as high-power transducers require the use of low-field high-performance 3D crystal materials

Method used

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  • Magnetostrictive material and preparation method thereof
  • Magnetostrictive material and preparation method thereof
  • Magnetostrictive material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Embodiment 1 prepares (Fe 0.83 Ga 0.17 ) 99.95 Tb 0.05

[0053] The preparation composition is (Fe 0.83 Ga 0.17 ) 99.95 Tb 0.05 A method for a magnetostrictive material, comprising the steps of:

[0054] 1. Ingredients

[0055] The purity of the selected raw materials Fe, Ga and Tb (RE raw materials) is greater than 99.99wt%, and in order to prevent the burning of elements during the smelting process, when the Fe, Ga and Tb raw materials are prepared according to the above composition, the burning loss of about 1wt% Add Ga and Tb respectively. Specifically, 27.72g of Fe, 7.158g of Ga and 0.048g of Tb were weighed and set aside.

[0056] 2. Preparation of master alloy ingot

[0057] Put the above-mentioned raw materials Fe, Ga and RE into the crucible of the vacuum non-consumable arc melting furnace. When placing, put the metal elements that are easy to burn at the bottom of the crucible, and the metal elements that are not easy to burn at the top of the cruci...

Embodiment 2

[0069] Embodiment 2 prepares (Fe 0.83 Ga 0.17 ) 99.97 Lu 0.03

[0070] In addition to the batching step, weigh 28.05g of Fe, 7.242g of Ga and 0.031g of Lu for later use; in the step of preparing magnetostrictive materials, heat the graphite heating body to 1575 ° C, and control the temperature gradient to 5 × 10 5 K / m, except that the growth rate is 8000mm / h, other steps are the same as in Example 1, and the obtained composition is (Fe 0.83 Ga 0.17 ) 99.97 Lu 0.03 Magnetostrictive material (size Φ7mm×20mm).

[0071] After testing, the (Fe 0.83 Ga 0.17 ) 99.97 Lu 0.03 The Lu element in the magnetostrictive material is completely dissolved in the FeGa matrix, and the material is a single crystal material with a orientation; in addition, the (Fe 0.83 Ga 0.17 ) 99.97 Lu 0.03 The saturation magnetostriction coefficient of the material is 330ppm, the saturation magnetic field is about 350Oe, and the magnetostriction performance and comprehensive usability are good. ...

Embodiment 3

[0072] Embodiment 3 prepares (Fe 0.81 Ga 0.19 ) 99.96 Dy 0.04

[0073] The preparation composition is (Fe 0.81 Ga 0.19 ) 99.96 Dy 0.04 A method for a magnetostrictive material, comprising the steps of:

[0074] 1. Ingredients

[0075] Weigh 27.88g of Fe, 8.25g of Ga and 0.04g of Dy for later use.

[0076] 2. Preparation of master alloy ingot

[0077] Put the above-mentioned raw materials Fe, Ga and Dy into the crucible of the vacuum non-consumable arc melting furnace, and evacuate the vacuum non-consumable arc melting furnace to 1.0×10 -3 After Pa, fill the furnace body with high-purity argon gas with a purity of more than 99.99%, and wait until the vacuum degree in the furnace rises to 5.0×10 -1 After Pa, stop inflating, repeat this step three times, set the melting current to 120A, melt the raw materials, control the time of each melting to about 5 minutes, repeat the melting four times, and obtain the master alloy ingot.

[0078] 3. Preparation of master alloy r...

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Abstract

The invention provides a magnetostrictive material and a preparation method thereof. The composition of the magnetostrictive material is (Fe[]1-x]Gax)[100-y]REy, wherein 0.17<=x<=0.19, 0.01<=y<=0.2, and RE is selected from one or more of Tb, La, Sm, Dy, Lu, Ho, Er and Tm. The preparation method comprises the following steps: smelting the Fe Ga and RE prepared according to the composition requirements into a mother alloy cast ingot, preparing a mother alloy bar, putting the mother alloy bar and a <100>-oriented FeGa monocrystal seed in a directional solidification apparatus, vacuumizing the directional solidification apparatus, charging protective gas, heating to melt all the mother alloy bar and melt the upper part of the FeGa monocrystal seed, and drawing the molten material into a coolant along the lower part of the FeGa monocrystal seed to carry out directional solidification, wherein the temperature gradient is controlled at 1*10<5>-9*10<5> K / m, and the growth rate is 1000-20000 mm / hour. The magnetostrictive material prepared by the method is a <100>-oriented monocrystal material in which the RE elements are completely dissolved in the FeGa matrix; the saturated magnetic field is only 100-5000e, and the magnetostriction coefficient is up to 300-1500 ppm; and the magnetostrictive material has favorable comprehensive usability and wide application prospects.

Description

technical field [0001] The invention relates to a magnetic material, in particular to a magnetostrictive material and a preparation method thereof. Background technique [0002] As an important class of ferromagnetic functional materials, magnetostrictive materials will reversibly change their geometric dimensions in all directions with changes in the magnetization state. This reversible deformation induced by a magnetic field is called magnetostriction. Since Joule proposed the magnetostrictive effect in 1842, magnetostrictive materials have been widely used in aviation, navigation, robotics, new energy, biomedicine and many other fields, playing an important role in the national economy and industrial production. FeGa alloy, as the latest generation of magnetostrictive material, has attracted widespread attention due to its low saturation magnetic field, good mechanical properties, and large magnetostriction. It has become a strategic new material in the 21st century. [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/52C30B11/00C22C38/00H01L41/20
Inventor 蒋成保孟崇峥王敬民张天丽刘敬华
Owner BEIHANG UNIV
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