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Fe-Ga-Ce-B alloy bar and preparation method thereof and cooling copper mold

A fe-ga-ce-b, alloy rod technology, applied in the field of functional material preparation, can solve the problems of unfavorable directional crystallization rods, slow filling cavity speed, and fluidity of alloy liquid, etc., to solve magnetostriction The performance is not high, the effect of improving the magnetostriction coefficient and improving the casting performance

Inactive Publication Date: 2019-09-10
NANCHANG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These traditional red copper molds have a simple structure, small inner cavity diameter and long length. Therefore, when the alloy liquid is compressed, the air pressure in the mold cavity increases to prevent the alloy liquid from flowing downward, and the filling speed of the cavity decreases. At this time, the metal mold is fast. The heat absorption further causes the fluidity of the alloy liquid to decrease rapidly, which is not conducive to the directional crystallization of the bar; moreover, the existing mold and cooler cannot provide a temperature gradient for cooling the alloy liquid, or the temperature gradient is small, and it is difficult to significantly increase the magnetostriction coefficient

Method used

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  • Fe-Ga-Ce-B alloy bar and preparation method thereof and cooling copper mold
  • Fe-Ga-Ce-B alloy bar and preparation method thereof and cooling copper mold

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preparation example Construction

[0037] The invention provides a method for preparing the Fe-Ga-Ce-B alloy rod, comprising the following steps:

[0038] The master alloy of iron, gallium, cerium and iron boron is vacuum smelted under a protective atmosphere, and the alloy master ingot is obtained after solidification;

[0039] The alloy master ingot is melted and then flowed into the cooling copper mold described in the above scheme for gradient cooling to obtain the Fe-Ga-Ce-B alloy rod.

[0040] In the invention, the intermediate alloy of iron, gallium, cerium and iron-boron is vacuum smelted under a protective atmosphere. In the present invention, the purity of the iron, gallium and cerium is preferably 99.99%; the iron-boron master alloy is preferably Fe-20B master alloy. In the present invention, the mass of the iron, gallium, cerium and iron-boron master alloy is configured according to the atomic ratio of each element in the Fe-Ga-Ce-B alloy rod. In the present invention, there is no special requirem...

Embodiment 1

[0059] (1) Select Fe, Ga, Ce and Fe-20B master alloy powder with a purity of 99.99% according to Fe 81.2 Ga 17 Ce 0.8 B 1 (atomic ratio) target composition formulation Prepare various raw materials.

[0060] (2) High-purity Fe is placed in the bottom non-porous quartz crucible, then the crucible is placed in the induction coil in the vacuum furnace, and high-purity Ga, Ce, and Fe-20B master alloy are placed in the feeding bin, Pass circulating cooling water, close the furnace door, first turn on the vacuum mechanical pump and the Roots pump in order to evacuate the vacuum furnace to 1×10 2 Below Pa, turn on the diffusion pump to evacuate the vacuum furnace to 10 -2 Below Pa; then feed high-purity Ar gas until the pressure in the furnace is less than 0.05Pa; then turn on the power, preheat the quartz crucible and high-purity Fe with a current of 500A for 2min, and then increase the current to 1400A; wait until the pure Fe is melted After 1 / 3~1 / 2, rotate the feeder to add t...

Embodiment 2

[0069] (1) Select Fe, Ga, Ce and Fe-20B master alloy powder with a purity of 99.99% according to Fe 79.2 Ga 19 Ce 0.6 B 1.2 (atomic ratio) target composition formulation Prepare various raw materials.

[0070] (2) High-purity Fe is placed in the bottom non-porous quartz crucible, then the crucible is placed in the induction coil in the vacuum furnace, and high-purity Ga, Ce, and Fe-20B master alloy are placed in the feeding bin, Pass circulating cooling water, close the furnace door, first turn on the vacuum mechanical pump and the Roots pump in order to evacuate the vacuum furnace to 1×10 2 Below Pa, turn on the diffusion pump to evacuate the vacuum furnace to 10 -2 Below Pa; then feed high-purity Ar gas until the pressure in the furnace is less than 0.05Pa; then turn on the power, preheat the quartz crucible and high-purity Fe with a current of 500A for 2min, and then increase the current to 1350A; wait until the pure Fe is melted After 1 / 3~1 / 2, rotate the feeder to add...

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Abstract

The invention provides a Fe-Ga-Ce-B alloy bar and a preparation method thereof and a cooling copper mold, and relates to the technical field of functional material preparation. The chemical composition of the Fe-Ga-Ce-B alloy bar is Fe(100-(x+y+z))GaxCeyBz, wherein x ranges from 17 to 19, y ranges from 0.2 to 1.5, z ranges from 0.8 to 1.2, and the length-diameter ratio of the Fe-Ga-Ce-B alloy barranges from 7 to 14. The Fe-Ga-Ce-B alloy bar is an alloy bar with the largest length-diameter ratio, double elements of Ce and B are doped with an iron and gallium alloy, and the magnetostrictive property, the plasticity and the strength of the alloy can be effectively improved. The cooling copper mold is composed of a molding copper mold with vent holes and a taper cooling cooler, the iron and gallium alloy rod with the large length-diameter ratio can be directionally crystallized, and the magnetostriction coefficient and casting property of the alloy can be improved.

Description

technical field [0001] The invention relates to the technical field of preparation of functional materials, in particular to a Fe-Ga-Ce-B alloy rod, a preparation method thereof and a cooling copper mold. Background technique [0002] Iron gallium (Fe-Ga) series alloys have better mechanical properties than Terfenol-D, are less brittle, can be hot-rolled, and can be machined by traditional metal processing methods. At present, the magnetostrictive coefficient of polycrystalline Fe-Ga alloy prepared in practical application is still very low. Whether the magnetostrictive property of polycrystalline Fe-Ga alloy can be improved is the key to whether this kind of material can be widely used. [0003] Fe-Ga alloy may have three phase structures, A 2 phase (body-centered cubic (bcc), disordered a-Fe phase), DO 3 phase (bcc, ordered FeGa phase) and L1 2 phase (face centered cubic (fcc), ordered FeGa phase). It is generally believed that a 2 Compared with the magnetostrictive p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C22C33/06B22D27/04
CPCB22D27/04C22C33/06C22C38/002C22C38/005
Inventor 晏建武何翠群彭阿芳
Owner NANCHANG INST OF TECH
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