Eureka AIR delivers breakthrough ideas for toughest innovation challenges, trusted by R&D personnel around the world.

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
View PDF1 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 magnetostrictive performance will be greatly reduced or even lost. Therefore, in the application process of traditional rare earth iron-based giant magnetostrictive materials, especially as underwater acoustic high-power low-frequency sonar systems, When driving components such as transducers, its easy-to-corrosion characteristics become an important factor restricting its development

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • 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

Examples

Experimental program
Comparison scheme
Effect test

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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Resistivityaaaaaaaaaa
Resistivityaaaaaaaaaa
Resistivityaaaaaaaaaa
Login to View More

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C22C33/04C22C38/02B22D11/11B22D11/16
Inventor 蒋成保徐惠彬徐立红
Owner BEIHANG UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com