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A FeGa-RE magnetic-driven flexible materials and its making technology

A magnetostrictive material and manufacturing process technology, which is applied in the material selection of magnetostrictive devices, the magnetism of inorganic materials, and the selection of device materials, etc., can solve the problems of high material brittleness, high saturation magnetic field, and high cost of raw materials, and achieve Improved mechanical properties, low production cost, and good magnetostrictive performance

Inactive Publication Date: 2007-12-12
BAOTOU RES INST OF RARE EARTHS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this rare earth giant magnetostrictive material also has its disadvantages. The one is that a high saturation magnetic field is required; high price), so its application promotion is greatly hindered

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1. Composition is Fe 83 Ga 17 The alloy of Dy is smelted in a vacuum suspension smelting furnace, and the vacuum degree is adjusted to 3.0×10 -3 ~5.0×10 -3 Pa, then pass high-purity argon as protective gas, smelt repeatedly 3-5 times to make the alloy composition uniform, and then cast it into a rod, use a high-temperature gradient directional solidification furnace for crystal orientation, and adjust the crystal orientation growth rate to 420mm / h, The crystal orientation sample was treated in a vacuum heat treatment furnace at 1100°C for 2 hours, cooled in the furnace to 750°C for 1 hour, and then air-cooled to room temperature. The magnetostriction coefficient λs of the sample is 270ppm, and the yield strength is 540MPa.

Embodiment 2

[0018] Embodiment 2. Composition is Fe 83 Ga 17 The alloy of Tb is smelted in a vacuum non-consumable electric arc furnace, and the vacuum degree is adjusted to 3.0×10 -3 ~5.0×10 -3 Pa, and then pass high-purity argon as a protective gas, repeatedly smelt 3-5 times to make the alloy composition uniform, and then cast it into a rod, use a high-temperature gradient directional solidification furnace for crystal orientation, and adjust the crystal orientation growth rate to 500mm / h, The crystal orientation sample was treated in a vacuum heat treatment furnace at 1120°C for 2 hours, cooled to 700°C for 2 hours in the furnace, and then water quenched to room temperature. The magnetostriction coefficient λs of the sample is 310ppm, and the yield strength is 987MPa.

Embodiment 3

[0019] Embodiment 3. Composition is Fe 83 Ga 17 The alloy of La is smelted in a vacuum suspension smelting furnace, and the vacuum degree is adjusted to 3.0×10 -3 ~5.0×10 -3 Pa, then pass high-purity argon as protective gas, smelt repeatedly 3-5 times to make the alloy composition uniform, and then cast it into a rod, use a high-temperature gradient directional solidification furnace for crystal orientation, and adjust the crystal orientation growth rate to 480mm / h, The crystal orientation sample was treated in a vacuum heat treatment furnace at 1100°C for 1 hour, cooled in the furnace to 720°C for 2 hours, and then air-cooled to room temperature. The magnetostriction coefficient λs of the sample is 260ppm, and the yield strength is 483MPa.

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Abstract

The invention relates to a FeGa-RE magnetostrictive material and manufacturing technique. The characteristics of magnetostrictive material are that: the ingredient of material consists of Fe, Ga and RE, the content of Ga is 10-40at%, the content of RE is 0.01-20at%, the content of additional intermingle is: C=200-600ppm,N=200-600ppm,O=200-700ppm,other is Fe, the optimal value of Ga is 12-28at%, FeGa-RE magnetostrictive material, the ingredient of material adds one or more kinds of La, Ce, Pr, Nd, Tb, Dy whose content is 0.01-20at%. The manufacturing technique includes the alloy with purified material is cast as the needed round bar, and the alloy bar is crystallized by high temperature gradient flash freezing method and Bridgman method.

Description

Technical field: [0001] The invention relates to a FeGa-RE system magnetostrictive material and a manufacturing process thereof, belonging to the field of magnetic materials. Background technique: [0002] When a ferromagnetic substance changes its magnetization state, its own length also changes slightly. This phenomenon is called magnetostriction. Almost all ferromagnetic materials have magnetostrictive properties. The magnitude of the magnetostriction is expressed by the magnetostriction coefficient λ, which is defined as λ=ΔL / L (L is the original length of the material sample, and ΔL is the change of the sample when the magnetization state changes). The early magnetostrictive materials are Ni and Fe-based alloys, which have good mechanical properties and shock-absorbing ability, but their magnetostrictive properties are poor, and λ is generally around 40-100ppm (1ppm=10 -6 ), so the scope of use is limited. Later, people invented a kind of electrostrictive material, ...

Claims

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Application Information

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IPC IPC(8): H01F1/14C22C33/06H01L41/20
Inventor 江丽萍张光睿吴双霞郝宏波周永波赵增祺
Owner BAOTOU RES INST OF RARE EARTHS
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