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A rare-earth giant magnetostrictive material with a large amount of expansion and contraction and its preparation method

A technology of giant magnetostriction and stretching amount, which is applied in the direction of material selection, device material selection, and polycrystalline material growth for magnetostrictive devices, which can solve the difficult preparation of polycrystalline giant magnetostrictive materials and the control of production equipment. High requirements, complex and difficult production processes, etc., to achieve good industrial application prospects, the preparation process and production equipment are simple and easy to operate, and are beneficial to the application.

Active Publication Date: 2022-03-04
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The present invention addresses the following problems: it is difficult to prepare -oriented polycrystalline giant magnetostrictive materials with a large amount of expansion and contraction. The existing method needs to add a strong magnetic field to induce the crystal orientation during the directional solidification process, but this method has a great impact on the production equipment. The control requirements of air tightness, temperature gradient and other conditions are very high, the production process is complicated and difficult, the production cost is high, and it is not suitable for industrial production

Method used

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  • A rare-earth giant magnetostrictive material with a large amount of expansion and contraction and its preparation method
  • A rare-earth giant magnetostrictive material with a large amount of expansion and contraction and its preparation method
  • A rare-earth giant magnetostrictive material with a large amount of expansion and contraction and its preparation method

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Experimental program
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Embodiment 1

[0040] After ultrasonically cleaning high-purity Tb, Dy, and Fe for 30 minutes, according to the chemical formula Tb 0.27 Dy 0.73 Fe 1.95 (Atomic ratio) is the target allocation of raw materials; first calculate the burning loss rate a=(1.95 / 1.92)×3%=3.05% of Tb according to the atomic ratio of Fe element, and the burning loss rate b=1.8×3.05%=5.49% of Dy . According to the calculated burning loss rate, weigh 7.9768g elemental terbium, 22.3785g elemental dysprosium and 19.6447g elemental iron, with a total weight of 50g. Put the raw materials into the copper crucible of the vacuum arc melting furnace, and vacuum the furnace to 5.5×10 -3 Pa, then filled with argon to 0.6MPa. When the formal smelting starts, the pure titanium in the furnace is sucked 4 times to remove the residual oxygen in the furnace. Subsequently, the Tb-Dy-Fe master alloy was melted, and each melting lasted for 30 s, and each ingot was smelted 5 times. After the smelting is complete, the sample is take...

Embodiment 2

[0043] The raw material formula and preparation method of Example 2 are basically the same as those of Example 1, except that the burning loss rate a of Tb element is 4.0%, and the burning loss rate b of Dy element is a×1.8=7.2%. The sample that embodiment 2 is cut is detected, and the magnetostriction curve under room temperature 14MPa is as follows image 3 As shown, the maximum magnetostriction coefficient reaches 1830ppm under the prestress. The X-ray diffraction pattern of the sample is as Figure 4 As shown, it shows that the sample has a good orientation, and the proportion of grains in the orientation is very high.

Embodiment 3

[0045] The raw material formula and preparation method of Example 3 are basically the same as those of Example 1, except that the burning loss rate a of Tb element is 2.8%, and the burning loss rate b of Dy element is a×1.8=5.04%. The samples cut out according to Example 3 were tested, and the maximum magnetostriction coefficient reached 1764ppm under the prestress of 14MPa. The sample had a mixed orientation of +, and the grains of the orientation accounted for the largest proportion.

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Abstract

The invention discloses a rare earth giant magnetostrictive material with a large stretching amount and a preparation method thereof. The chemical formula of the rare earth giant magnetostrictive material is: Tb x Dy 1‑x Fe z , 0.25≤x≤0.35, 1.92≤z≤2.00; the preparation method includes the following steps: (i) using terbium, dysprosium and iron as raw materials, according to the atomic ratio of each element in the rare earth giant magnetostrictive material, the calcination of terbium The burning loss rate a of dysprosium and the burning loss rate b of dysprosium are compounded; wherein the burning loss rate a of terbium is 2.5% to 4.7%, and the burning loss rate b of dysprosium is 5.0% to 8.0%, and b=(1.5~2.0)×a ; (ii) melting, directional solidification and heat treatment of prepared raw materials to obtain rare earth giant magnetostrictive materials. The present invention starts from the angle of adjusting and controlling the ratio of raw materials, and can increase the rare earth-rich phase RFe by adjusting and controlling the composition of raw materials. 2 ratio, thereby improving the magnetostrictive properties of the sample.

Description

technical field [0001] The invention relates to a rare-earth giant magnetostrictive material with large expansion and contraction and a preparation method thereof, belonging to rare-earth magnetic functional materials. Background technique [0002] In 1842, Joule (J.P.Joul) discovered the magnetostrictive effect, also known as the Joule effect. The magnetostrictive effect refers to that when the ferromagnetic material is magnetized by the external magnetic field H and the magnetization state changes, the size l of the material will produce a deformation ΔL, and its magnetostriction is represented by λ=ΔL / L. Traditional magnetostrictive materials include Ni, Co, Fe-13%Al and other materials, but their magnetostrictive coefficients are on the order of 10 -6 ~10 -5 Among them, the lower stretching coefficient limits the application of traditional magnetostrictive materials. [0003] In the 1980s, A.E.Clark et al. of the U.S. Naval Surface Weapons Center found that by changin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/04C22C38/00C30B28/06C30B29/52H01L41/20H10N35/85
CPCC22C33/04C22C38/005C30B29/52C30B28/06H10N35/85
Inventor 杨鑫陈钰凯徐先东黎国猛
Owner HUNAN UNIV