Method for preparing axial preferred orientated corrosion-resistant high-resistance ultra magnetostrictive material

A technology of giant magnetostriction and preferred orientation, applied in the field of Tb-Dy-Fe-Si giant magnetostrictive materials, can solve the problems of reduced magnetostrictive performance, easy corrosion, loss, etc., and achieves improved rupture potential and good durability corrosion performance, good magnetostrictive performance

Inactive Publication Date: 2007-06-20
BEIHANG UNIV
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Problems solved by technology

[0011] Since the electrode potential value of rare earth elements is very low, second only to a few other elements such as alkali metals, they are extremely corrosive elements. Rare earth iron compound R-Fe giant magnetostrictive materials are also prone to electrochemical corrosion in humid air or seawater. Once the magnetostrictive material is electrochemically corroded, its ...

Method used

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  • Method for preparing axial preferred orientated corrosion-resistant high-resistance ultra magnetostrictive material
  • Method for preparing axial preferred orientated corrosion-resistant high-resistance ultra magnetostrictive material
  • Method for preparing axial preferred orientated corrosion-resistant high-resistance ultra magnetostrictive material

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Embodiment 1

[0053] Prepare 50g of Tb with axial preferred orientation 0.3 Dy 0.7 (Fe 0.975 Si 0.025 ) 1.95 High resistance giant magnetostrictive material

[0054] Weigh 8.9g Tb, 21.1g Dy, 19.7g Fe and 0.3g Si elements with a purity of 99.9% and put them into a vacuum electric arc furnace. The furnace is first evacuated to a degree of 2×10 -3 Pa, and then filled with high-purity argon, at this time the pressure in the furnace rose to 0.7 × 10 5 Pa, start to smelt the alloy; smelt the alloy repeatedly 4 times to make the alloy composition uniform and then cast it into Tb 0.3 Dy 0.7 (Fe 0.975 Si 0.025 ) 1.95 Rod material.

[0055] As-cast Tb 0.3 Dy 0.7 (Fe 0.975 Si 0.025 ) 1.95 For the bar material, a wire-cut 1mm×0.5mm×25mm sample is used for the resistivity test, and its 298K resistivity is 99μΩcm. (As shown in Figure 1)

[0056] The above prepared Tb 0.3 Dy 0.7 (Fe 0.975 Si 0.025 ) 1.95 The bar is placed in the high-purity corundum tube of the high-temperature grad...

Embodiment 2

[0060] Prepare 50g of Tb with axial preferred orientation 0.3 Dy 0.7 (Fe 0.9 Si 0.1 ) 1.95 High resistance giant magnetostrictive material

[0061] Weigh 9g Tb, 21.5g Dy, 18.5g Fe and 1g Si elements with a purity of 99.9% and put them into a vacuum electric arc furnace. The furnace is first evacuated to a degree of 2×10 -3 Pa, and then filled with high-purity argon, at this time the pressure in the furnace rose to 0.7 × 10 5 Pa, start to smelt the alloy; smelt the alloy repeatedly 4 times to make the alloy composition uniform and then cast it into Tb 0.3 Dy 0.7 (Fe 0.9 Si 0.1 ) 1.95 Rod material.

[0062] Measuring resistivity: for as-cast Tb 0.3 Dy 0.7 (Fe 0.9 Si 0.1 ) 1.95 For the bar material, a wire-cut 1mm×0.5mm×25mm sample was used for the resistivity test, and its resistivity at room temperature at 298K was 126μΩcm (as shown in Figure 1).

[0063] Put the prepared cast rod into the high-purity corundum tube of the high-temperature gradient induction cry...

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Abstract

The method to prepare corrosion-resist high-resistance supermagnetostrictive material with axial preferred orientation comprises: adding Si into Tb-Dy-Fe material to improve its normal resistance and corrosion-resist performance; in directional solidification, using the floating zone method with directional solidification speed 240mm/h-900mm/h and temperature gradient 500-900Deg/cm at 1500-1900Deg to prepare the material. In 400mT additional magnetic field and 10MPa prestress, this material has magnetostriction up to 1100-1700ppm and corrosion resistance improved 2-8% in 3.5% NaCl solution.

Description

technical field [0001] The invention relates to a preparation method of a rare earth iron-based giant magnetostrictive material, more particularly, it refers to the preparation of a rare earth iron-based giant magnetostrictive material with a preferred orientation of <110> in the temperature range of 250K to 300K, and has corrosion resistance and high electrical resistance. Method for Tb-Dy-Fe-Si giant magnetostrictive materials. Background technique [0002] When ferromagnetic materials are magnetized in a magnetic field, their shape and size change, a phenomenon known as magnetostriction. The magnetostrictive coefficient (strain) of TbDyFe can reach 1500-2000PPm, and its magnetostrictive strain is 50 times larger than that of Ni-based alloys and 5-25 times larger than that of piezoelectric ceramics, so it is called a giant magnetostrictive material. Laves phase RFe 2 , especially (Tb,Dy)Fe 2 Phase, due to its excellent magnetostrictive performance has been widely ...

Claims

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Application Information

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IPC IPC(8): C22C33/04C22C38/02B22D11/11B22D11/16
Inventor 蒋成保徐惠彬徐立红
Owner BEIHANG UNIV
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