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Method for preparing Fe-Ga-In-Tb alloy bar by filtering and undercooling ceramic

A fe-ga-in-tb, ceramic filtration technology, applied in the field of material processing engineering, can solve the problems of poor directional crystallization effect and low magnetostrictive performance of Fe-Ga alloy, and achieve uniform pore size, easy control, and orientation. The effect of good crystal growth and small burning loss

Inactive Publication Date: 2013-06-12
NANCHANG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method uses a new type of nanocrystalline porous ceramic filter to filter the metal melt, which can further improve the purity of the melt, and inhibit the heterogeneous nucleation and crystallization process, thereby further improving the degree of supercooling; using a mobile crucible to heat Combining liquid metal undercooling to stimulate directional crystallization to prepare oriented Fe-Ga-In-Tb alloy rods, which solves the shortcomings of Fe-Ga alloy prepared by traditional preparation methods such as low magnetostrictive performance and poor directional crystallization effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] 1. Preparation before melting

[0054] (1) Self-made nanoporous ceramic filter

[0055] The filter structure is designed as three layers, the uppermost filter plate has a through hole diameter of 5mm, the middle hole diameter is 3mm, and the bottom hole diameter is 2mm, and the through holes of each layer are staggered from each other;

[0056] The specific manufacturing process of preparing nanocrystalline porous ceramic filter is: chemically pure ZrO with a particle size of 0.2 μm 2 Powder, Al 2 o 3 powder and MgO powder according to ZrO 2 90%, Al 2 o 3 MgO powder accounted for 9%, MgO powder accounted for 1% mixed, and then in the high-energy ball mill, the raw material powder was ball-milled into 100 nanometer nanocrystalline particles, and then the binder PVB (polyvinyl butyral), absolute ethanol (alcohol) Modulated into ceramic particle slurry. The organic foam polyurethane sponge is used as a porous carrier, and the ceramic slurry is evenly coated on it, a...

Embodiment 2

[0073] 1. Preparation before melting

[0074] (1) Self-made nanoporous ceramic filter

[0075] The filter structure is designed as three layers, the uppermost filter plate has a through hole diameter of 4mm, the middle hole diameter is 2.5mm, and the bottom hole diameter is 1.5mm, and the through holes of each layer are staggered from each other;

[0076] The specific manufacturing process for preparing nanocrystalline porous ceramic filter is: chemically pure ZrO with a particle size of 0.15 μm 2 Powder, Al 2 o 3 powder and MgO powder according to ZrO 2 Accounted for 80%, Al 2 o 3 MgO powder accounted for 16%, MgO powder accounted for 4% mixed, then in the high-energy ball mill, the raw material powder was ball-milled into 80 nanometer nanocrystalline particles, and then the binder PVB, namely polyvinyl butyral, and absolute ethanol, namely alcohol Modulated into ceramic particle slurry. The organic foam polyurethane sponge is used as a porous carrier, and the ceramic ...

Embodiment 3

[0094] 1. Preparation before melting

[0095] (1) Self-made nanoporous ceramic filter

[0096] The filter structure is designed as three layers, and each layer of filter sheet has through holes in addition to interconnected network holes. The diameter of the through hole of the uppermost filter is 3mm, the diameter of the middle hole is 2mm, and the diameter of the bottom hole is 0.5mm, and the through holes are staggered from each other;

[0097] The specific manufacturing process for preparing nanocrystalline porous ceramic filter is: chemically pure ZrO with a particle size of 0.15 μm 2 Powder, Al 2 o 3 powder and MgO powder according to ZrO 2 70%, Al 2 o 3 MgO powder accounted for 25% and MgO powder accounted for 5%. Then the raw material powder was ball-milled into 70nm nanocrystalline particles in a high-energy ball mill. Modulated into ceramic particle slurry. The organic foam polyurethane sponge is used as a porous carrier, and the ceramic slurry is evenly coat...

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Abstract

The invention discloses a method for preparing Fe-Ga-In-Tb alloy bar by filtering and undercooling ceramic. A Fe-Ga-In-Tb novel magnetostriction alloy component system is used for overcoming the defect that the iron gallium binary component system alloy is hard to smelt. The method comprises the following steps: firstly filtering an alloy melt through a nano-porous ceramic filter to improve the purity of the Fe-Ga-In-Tb melt, undercooling the alloy melt, and then heating the alloy, enabling an alloy liquid metal to stimulate directional crystallization growth through an undercooling directional crystallization system. The alloy bar prepared by the method disclosed by the invention is smooth in surface, high in directional degree, precise and uniform in component, and good in comprehensive performance.

Description

technical field [0001] The invention relates to a method for preparing Fe-Ga-In-Tb alloy directional crystal rods through deep supercooling through ceramic filtration, which belongs to the functional material preparation technology in the field of material processing engineering. Background technique [0002] Although the Fe-Ga alloy exhibits excellent comprehensive performance, there is still a certain gap in the giant magnetostrictive performance compared with the rare earth material Terfenol-D. Adding elements and improving the process are effective ways to prepare high-performance giant magnetostrictive Fe-Ga alloys. [0003] Deep subcooling technology is a new type of rapid solidification technology that has developed rapidly in recent years. There are two key technologies: the first is to purify the melt through various treatment processes to obtain thermodynamically deep subcooling. Then, near the critical supercooling point of the alloy melt, the excitation source ...

Claims

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Application Information

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IPC IPC(8): C22C33/04C22C38/00B22D27/04B22D27/02
Inventor 晏建武罗亮彭阿芳张晨曙
Owner NANCHANG INST OF TECH
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