CN104775068B - High-performance macroscopic foam-state Fe73Ga27 magnetostrictive material and preparation process thereof - Google Patents
High-performance macroscopic foam-state Fe73Ga27 magnetostrictive material and preparation process thereof Download PDFInfo
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- 238000002360 preparation method Methods 0.000 title claims abstract description 19
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- 239000000956 alloy Substances 0.000 claims abstract description 64
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims abstract description 59
- 239000011734 sodium Substances 0.000 claims abstract description 59
- 229910052708 sodium Inorganic materials 0.000 claims abstract description 59
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 24
- 229910052802 copper Inorganic materials 0.000 claims abstract description 24
- 239000010949 copper Substances 0.000 claims abstract description 24
- 238000000034 method Methods 0.000 claims abstract description 9
- 239000011148 porous material Substances 0.000 claims abstract description 6
- 230000008569 process Effects 0.000 claims abstract description 5
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 56
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 40
- 210000001161 mammalian embryo Anatomy 0.000 claims description 30
- 239000004202 carbamide Substances 0.000 claims description 28
- 235000013877 carbamide Nutrition 0.000 claims description 28
- 239000003708 ampul Substances 0.000 claims description 23
- 239000010453 quartz Substances 0.000 claims description 23
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 23
- 239000000203 mixture Substances 0.000 claims description 21
- 229910052786 argon Inorganic materials 0.000 claims description 20
- 238000002844 melting Methods 0.000 claims description 20
- 239000007921 spray Substances 0.000 claims description 16
- 230000008018 melting Effects 0.000 claims description 13
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 10
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 10
- 238000007654 immersion Methods 0.000 claims description 10
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 238000003723 Smelting Methods 0.000 claims description 8
- 238000005245 sintering Methods 0.000 claims description 8
- 238000004506 ultrasonic cleaning Methods 0.000 claims description 7
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 5
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 5
- 230000015572 biosynthetic process Effects 0.000 claims description 5
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- 229910052750 molybdenum Inorganic materials 0.000 claims description 5
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- 238000010926 purge Methods 0.000 claims description 5
- 238000010791 quenching Methods 0.000 claims description 5
- 230000000171 quenching effect Effects 0.000 claims description 5
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- 244000137852 Petrea volubilis Species 0.000 claims description 3
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Abstract
The invention discloses a high-performance macroscopic foam-state Fe73Ga27 magnetostrictive material and a preparation process thereof. Holes are introduced into an Fe73Ga27 alloy by preparing a porous sodium metaaluminate precursor so as to ensure that the magnetostrictive performance of the Fe73Ga27 alloy can be improved; the pore size is 20-100 microns, and the porosity is 30-50%; and the preparation process comprises the following step: performing spray casting in a copper mold by using a vacuum spray casting furnace. According to the high-performance macroscopic foam-state Fe73Ga27 magnetostrictive material and the preparation process thereof disclosed by the invention, the hindering effect of magnetic domain rotation in Fe73Ga27 can be reduced based on introduced pores, the macroscopic foam-state Fe73Ga27 magnetostrictive material can be developed, and large magnetic-induced strain, low driving fields and relatively high mechanical performance can be achieved; and a foam material prepared by using a method disclosed by the invention is uniform in pore, ensures that the magnetostrictive coefficient exceeds 300ppm, also is simple and convenient in process and high in finished product rate, and is beneficial to popularization and application.
Description
Technical field
The invention belongs to magnetostriction materials field, relate to a kind of high-performance macroscopic bubbles state Fe73Ga27Magnetostriction materials and preparation technology thereof.
Background technology
Fe-Ga is a kind of solid-solution material formed by Ga atom and Fe atom, its saturation magnetostriction constant (monocrystal material λ s ~ 400 ppm) is tradition iron-based and tens times of Ni-based magnetostriction materials, and driving magnetic field the lowest (~ 100 Oe), only the 1/10 of terbium dysprosium ferrum giant magnetostrictive material.Compared with traditional rare earth ultra-magnetostriction material, ferrum gallium alloy also has good mechanical property and magnetostriction temperature stability, and (hot strength is up to 23 times of 500 MPa, about Tb-Dy-Fe alloy；Curie temperature～675 DEG C, higher 300 DEG C than Tb-Dy-Fe alloy, Magnetostriction is positively retained at-20～80 DEG C of wider temperature ranges), and without rare earth, material cost is the lowest.
In recent years, Fe-Ga magnetostriction materials have been done substantial amounts of research work theoretical and experimental by people, but the mechanism producing big magnetostriction for Fe-Ga alloy is unclear, limits the further raising of Magnetostriction.
Research finds, Ga is not simple diluting effect on the impact of Fe magnetic moment, and the atomic magnetic moment of Fe changes with the difference of Ga content, and the increase of magnetic moment makes alloy energy density increase, and thus causes the magnetostrictive strain of alloy to increase.Based on this, research Fe-Ga alloy being produced to big magnetostriction reason is broadly divided into intrinsic and outer official report two aspect.Intrinsic model is mainly based upon and Ga-Ga atom pair lattice mismatch phenomenon in Fe-Ga alloy is carried out theoretical research, indicates the magnetostrictive strain in Fe-Ga alloy and derives from the change of the Fe-Ga atom pair at Ga atom the second electron coordinate shell with Ga Ga atom pair.Outer official report model thinks that the nanometer Tetragonal anisotropism occurred in Fe-Ga makes material non-uniform magnetization phenomenon occur, effective stray magnetic field is produced around matrix, force magnetic moment to change from direction of easy axis under outside magnetic field effect and produce strain, avoid the need for the magnetic history first moving neticdomain wall of bigger energy, thus strengthen Magnetostriction.
Current related work has turned out the existence of nanometer Tetragonal in Fe-Ga alloy, it is believed that these nanometer magnetic domains reorientation in magnetic field the mechanism being to cause Fe-Ga alloy big magnetostriction performance of growing up.
The magneto-strain mechanism of NiMnGa material is similar with Fe-Ga, people have decreased the inhibition of martensite variants twin boundary migration by preparing macroscopic bubbles NiMnGa introducing hole, make the magneto-strain of polycrystalline NiMnGa material bring up to more than 20000ppm from 20ppm.Therefore, the method preparing macroscopic bubbles NiMnGa introducing hole can be incorporated in Fe-Ga alloy, it is possible to reduce the inhibition of nanometer domain motion, thus improves the Magnetostriction of Fe-Ga polycrystalline material.
Summary of the invention
It is an object of the invention to provide a kind of high-performance macroscopic bubbles state Fe73Ga27Magnetostriction materials and preparation technology thereof, the method by melting, cut, sinter, spray to cast has big magnetostriction performance, macroscopic bubbles state Fe of low driving field, higher mechanical property, low cost73Ga27Magnetostriction materials.
The purpose of the present invention is accomplished by:
A kind of high-performance macroscopic bubbles state Fe73Ga27Magnetostriction materials are macroscopic bubbles state shape, and its pore size is 20-100 μm, and porosity is 30%-50%.
Described high-performance macroscopic bubbles state Fe73Ga27The preparation technology of magnetostriction materials is:
1) add scaling loss amount by described composition and carry out dispensing: use vacuum non-consumable arc furnace smelting nut alloy, vacuum non-consumable arc-melting furnace is evacuated to 4*10-3~5*10-3Pa, after pouring 10kPa ar purging, then suction is to 2*10-3~3*10-3Pa；The percent by volume purity of argon is 99.99%.Being then charged with argon melting to vacuum is 40kPa ~ 50kPa, dispensing is melted under melting electric current 100A ~ 150A, and smelting time is 3min ~ 5min, melt back 4 ~ 5 times, prepares alloy pig,
2) alloy pig molybdenum filament wire cutting machine step 1 melted out cuts into the bulk of 6mm*6mm*10mm, grinds off to ensure non-scale by alloy block surface with sand paper, with ethanol, alloy block surface clean is clean, keeps dry state；
3) sodium metaaluminate and carbamide, mortar are moved to glove box, do not absorb water with sodium metaaluminate when ensureing preparation, weigh the mixture of 20g sodium metaaluminate and carbamide, in mixture, mass percent shared by carbamide is 40% ~ 60%, carbamide and sodium metaaluminate mix after with mortar grinder 30min until the most finely ground and mix homogeneously, removal glove box；
4) select the mould for tabletting press of 0.25 inch inner diameter, the sample of different urea contents is pressed into disk at 30MPa respectively；
5) wafer sample of compacting is respectively put in alumina crucible, puts in Muffle furnace and be sintered, sinter out the column sodium metaaluminate embryo of a diameter of 0.25 inch；
6) putting in spray to cast container by bulk alloy ingot, spray to cast container is the quartz ampoule of a bottom perforate；Then revolving, with single roller, stove of quenching and carry out copper mold spray to cast, the column sodium metaaluminate embryo gone out by sintering is put in the hole of copper mold, is placed on by copper mold below quartz ampoule, makes to be placed with the hole alignment quartz ampoule bottom end opening of sodium metaaluminate embryo, is evacuated to 2*10-2Pa~2*10-3Pa, is passed through 50kPa argon and does protective atmosphere, be passed through argon post-heating in quartz ampoule, is incubated 30s ~ 60s, in the sodium metaaluminate embryo being ejected in copper mold, it is thus achieved that containing the Fe of sodium metaaluminate after reaching 1300 DEG C ~ 1400 DEG C73Ga27Alloy bar；
7) by the Fe containing sodium metaaluminate73Ga27Alloy bar is put into equipped with in the container of the hydrochloric acid solution that volumetric concentration is 3%, and container is put into supersonic generator, ultrasonic immersion treatment under conditions of supersonic frequency is 40kHz, and ultrasonic soak time is calculated by every 1mm alloy bar 10min；Being taken out by alloy bar after ultrasonic immersion and put into ultrasonic cleaning 3 times under 40kHz supersonic frequency in distilled water, each scavenging period cleans 5min by the length of every 1mm alloy bar and calculates；Finally material is centrifuged under the conditions of rotating speed is 1000 turns/min；Finally give high-performance macroscopic bubbles state Fe73Ga27Magnetostriction materials.
The described sintering process in step 5) is: be first raised to 220 DEG C from 20 DEG C with 20min, insulation 180min, carbamide is made fully to evaporate formation hole in sodium metaaluminate embryo, then it is raised to 1500 DEG C of insulation 180min through 150min, the sodium metaaluminate embryo making porous fully sinters, and finally drops to 200 DEG C from 1500 DEG C with 180min.
Described quartz ampoule bottom aperture diameter is 0.7mm
Described copper mold bore dia is 7mm, obtains the alloy bar of a diameter of 7mm.
It is an advantage of the current invention that: macroscopic bubbles state Fe developed73Ga27Magnetostriction materials have excellent Magnetostriction；Macroscopic bubbles state Fe developed73Ga27Magnetostriction materials have only to low driving field, can use under low externally-applied magnetic field；Macroscopic bubbles state Fe developed73Ga27Magnetostriction materials have preferable mechanical property and corrosion resistance, can use in the presence of a harsh environment；Use foam state Fe that the method for the present invention prepares73Ga27Magnetostriction materials hole is uniform, and magnetostriction coefficient is high, and up to 300ppm, and simple process, yield rate are high, be conducive to popularization and application.
Accompanying drawing explanation
Fig. 1 is the foam Fe of porosity 33.65%74Ga27Magnetostriction materials and Fe74Ga27The Magnetostriction curve of block materials.
Fig. 2 is the foam Fe of porosity 47.88%74Ga27Magnetostriction materials and Fe74Ga27The Magnetostriction curve of block materials.
Fig. 3 is for embodiment 1, embodiment 2 and the comparison diagram of block materials Magnetostriction curve.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention is described in further detail.
A kind of high-performance macroscopic bubbles state Fe73Ga27Magnetostriction materials are macroscopic bubbles state shape, and its pore size is 20-100 μm, and porosity is 30%-50%.
Described high-performance macroscopic bubbles state Fe73Ga27The preparation technology of magnetostriction materials is:
1) add scaling loss amount by described composition and carry out dispensing: use vacuum non-consumable arc furnace smelting nut alloy, vacuum non-consumable arc-melting furnace is evacuated to 4*10-3~5*10-3Pa, after pouring 10kPa ar purging, then suction is to 2*10-3~3*10-3Pa；The percent by volume purity of argon is 99.99%.Being then charged with argon melting to vacuum is 40kPa ~ 50kPa, dispensing is melted under melting electric current 100A ~ 150A, and smelting time is 3min ~ 5min, melt back 4 ~ 5 times, prepares alloy pig,
2) alloy pig molybdenum filament wire cutting machine step 1 melted out cuts into the bulk of 6mm*6mm*10mm, grinds off to ensure non-scale by alloy block surface with sand paper, with ethanol, alloy block surface clean is clean, keeps dry state；
3) sodium metaaluminate and carbamide, mortar are moved to glove box, do not absorb water with sodium metaaluminate when ensureing preparation, weigh the mixture of 20g sodium metaaluminate and carbamide, in mixture, mass percent shared by carbamide is 40% ~ 60%, carbamide and sodium metaaluminate mix after with mortar grinder 30min until the most finely ground and mix homogeneously, removal glove box；
4) select the mould for tabletting press of 0.25 inch inner diameter, the sample of different urea contents is pressed into disk at 30MPa respectively；
5) wafer sample of compacting is respectively put in alumina crucible, puts in Muffle furnace and be sintered, sinter out the column sodium metaaluminate embryo of a diameter of 0.25 inch；
6) putting in spray to cast container by bulk alloy ingot, spray to cast container is the quartz ampoule of a bottom perforate；Then revolving, with single roller, stove of quenching and carry out copper mold spray to cast, the column sodium metaaluminate embryo gone out by sintering is put in the hole of copper mold, is placed on by copper mold below quartz ampoule, makes to be placed with the hole alignment quartz ampoule bottom end opening of sodium metaaluminate embryo, is evacuated to 2*10-2Pa~2*10-3Pa, is passed through 50kPa argon and does protective atmosphere, be passed through argon post-heating in quartz ampoule, is incubated 30s ~ 60s, in the sodium metaaluminate embryo being ejected in copper mold, it is thus achieved that containing the Fe of sodium metaaluminate after reaching 1300 DEG C ~ 1400 DEG C73Ga27Alloy bar；
7) by the Fe containing sodium metaaluminate73Ga27Alloy bar is put into equipped with in the container of the hydrochloric acid solution that volumetric concentration is 3%, and container is put into supersonic generator, ultrasonic immersion treatment under conditions of supersonic frequency is 40kHz, and ultrasonic soak time is calculated by every 1mm alloy bar 10min；Being taken out by alloy bar after ultrasonic immersion and put into ultrasonic cleaning 3 times under 40kHz supersonic frequency in distilled water, each scavenging period cleans 5min by the length of every 1mm alloy bar and calculates；Finally material is centrifuged under the conditions of rotating speed is 1000 turns/min；Finally give high-performance macroscopic bubbles state Fe73Ga27Magnetostriction materials.
The described sintering process in step 5) is: be first raised to 220 DEG C from 20 DEG C with 20min, insulation 180min, carbamide is made fully to evaporate formation hole in sodium metaaluminate embryo, then it is raised to 1500 DEG C of insulation 180min through 150min, the sodium metaaluminate embryo making porous fully sinters, and finally drops to 200 DEG C from 1500 DEG C with 180min.
Described quartz ampoule bottom aperture diameter is 0.7mm
Described copper mold bore dia is 7mm, obtains the alloy bar of a diameter of 7mm.
Embodiment 1:Preparation porosity is the foam Fe of 33.65%73Ga27Alloy
Take the raw material needed for design composition with electronic balance scale, and add the Ga scaling loss amount of 3wt%, gross weight 40g, wherein use the Ga of the Fe and 99.99% of purity 99.99%, the raw material prepared is put into vacuum non-consumable arc-melting furnace.
Vacuum non-consumable arc-melting furnace is evacuated to 5*10-3Pa, after pouring 10kPa ar purging, then suction is to 3*10-3Pa；The percent by volume purity of argon is 99.99%.
Being then charged with argon melting to vacuum is 50kPa, declines dispensing at melting electric current 100A ~ 150A and melts, and smelting time is 5min, melt back 5 times, prepares alloy pig.
Melting is to ensure that alloy pig homogeneity of ingredients 5 times.
Alloy pig molybdenum filament wire cutting machine is processed into 6mm*6mm*10mm cuboid dress sample
Alloy sample is put in ethanol, under conditions of 50kHz, ultrasonic cleaning 10min, puts into baking oven and dries 30min under the conditions of 80 DEG C, obtain clean sample after cleaning.
Sodium metaaluminate and carbamide, mortar etc. move to glove box, do not absorb water with sodium metaaluminate when ensureing preparation, and the urea quality by 40% is than the sample weighing 20g gross weight.Carbamide and sodium metaaluminate mix after with mortar grinder 30min until the most finely ground and mix homogeneously, removal glove box；
Select the mould for tabletting press of 0.25 inch inner diameter, the sample of 40% urea content is pressed into disk at 30MPa；
The wafer sample of compacting is respectively put in alumina crucible, put in Muffle furnace and be sintered, first it is raised to 220 DEG C from 20 DEG C with 20min, insulation 180min, make carbamide fully evaporate formation hole in sodium metaaluminate embryo, be then raised to 1500 DEG C of insulation 180min through 150min, make the sodium metaaluminate embryo of porous fully sinter, finally drop to 200 DEG C from 1500 DEG C with 180min, sinter out the column sodium metaaluminate embryo of a diameter of 0.25 inch；
Being put into by bulk alloy ingot in spray to cast container, spray to cast container is the quartz ampoule of a bottom perforate；Then revolving, with single roller, stove of quenching and carry out copper mold spray to cast, the sodium metaaluminate column embryo gone out by sintering is put in the hole of copper mold.Copper mold is placed on below quartz ampoule, makes to be placed with the hole alignment quartz ampoule bottom end opening of sodium metaaluminate embryo, be evacuated to 3*10-3Pa, is passed through 50kPa argon and does protective atmosphere, be passed through argon post-heating in quartz ampoule, and alloy solution is incubated 40s, in the sodium metaaluminate embryo being ejected in copper mold, it is thus achieved that containing the alloy bar of sodium metaaluminate after reaching 1350 DEG C.
Putting into the alloy bar containing sodium metaaluminate equipped with in the container of the hydrochloric acid solution that volumetric concentration is 3%, container is put into supersonic generator, ultrasonic immersion treatment under conditions of supersonic frequency is 40kHz, ultrasonic soak time is calculated by every 1mm alloy bar 10min；Being taken out by alloy bar after ultrasonic immersion and put into ultrasonic cleaning 3 times under 40kHz supersonic frequency in distilled water, each scavenging period cleans 5min by the length of every 1mm alloy bar and calculates；Finally material is centrifuged under the conditions of rotating speed is 1000 turns/min.
Fig. 1 is the foam Fe of porosity 33.65%74Ga27The Magnetostriction curve of magnetostriction materials and block materials, foam Fe74Ga27The magnetostriction coefficient of magnetostriction materials maximum is 319ppm.
Embodiment 2:Preparation porosity is the foam Fe of 47.88%73Ga27Alloy
Take the raw material needed for design composition with electronic balance scale, and add the Ga scaling loss amount of 3wt%, gross weight 40g, wherein use the Ga of the Fe and 99.99% of purity 99.99%, the raw material prepared is put into vacuum non-consumable arc-melting furnace.
Vacuum non-consumable arc-melting furnace is evacuated to 5*10-3Pa, after pouring 10kPa ar purging, then suction is to 3*10-3Pa；The percent by volume purity of argon is 99.99%.
Being then charged with argon melting to vacuum is 50kPa, declines dispensing at melting electric current 100A ~ 150A and melts, and smelting time is 5min, melt back 5 times, prepares alloy pig.
Melting is to ensure that alloy pig homogeneity of ingredients 5 times.
Alloy pig molybdenum filament wire cutting machine is processed into 6mm*6mm*10mm cuboid dress sample
Alloy sample is put in ethanol, under conditions of 50kHz, ultrasonic cleaning 10min, puts into baking oven and dries 30min under the conditions of 80 DEG C, obtain clean sample after cleaning.
Sodium metaaluminate and carbamide, mortar etc. move to glove box, do not absorb water with sodium metaaluminate when ensureing preparation, and the urea quality by 60% is than the sample weighing 20g gross weight.Carbamide and sodium metaaluminate mix after with mortar grinder 30min until the most finely ground and mix homogeneously, removal glove box；
Select the mould for tabletting press of 0.25 inch inner diameter, the sample of 60% urea content is pressed into disk at 30MPa；
The wafer sample of compacting is respectively put in alumina crucible, put in Muffle furnace and be sintered, first it is raised to 220 DEG C from 20 DEG C with 20min, insulation 180min, make carbamide fully evaporate formation hole in sodium metaaluminate embryo, be then raised to 1500 DEG C of insulation 180min through 150min, make the sodium metaaluminate embryo of porous fully sinter, finally drop to 200 DEG C from 1500 DEG C with 180min, sinter out the column sodium metaaluminate embryo of a diameter of 0.25 inch；
Being put into by bulk alloy ingot in spray to cast container, spray to cast container is the quartz ampoule of a bottom perforate；Then revolving, with single roller, stove of quenching and carry out copper mold spray to cast, the sodium metaaluminate column embryo gone out by sintering is put in the hole of copper mold.Copper mold is placed on below quartz ampoule, makes to be placed with the hole alignment quartz ampoule bottom end opening of sodium metaaluminate embryo, be evacuated to 3*10-3Pa, is passed through 50kPa argon and does protective atmosphere, be passed through argon post-heating in quartz ampoule, and alloy solution is incubated 40s, in the sodium metaaluminate embryo being ejected in copper mold, it is thus achieved that containing the alloy bar of sodium metaaluminate after reaching 1350 DEG C.
Putting into the alloy bar containing sodium metaaluminate equipped with in the container of the hydrochloric acid solution that volumetric concentration is 3%, container is put into supersonic generator, ultrasonic immersion treatment under conditions of supersonic frequency is 40kHz, ultrasonic soak time is calculated by every 1mm alloy bar 10min；Being taken out by alloy bar after ultrasonic immersion and put into ultrasonic cleaning 3 times under 40kHz supersonic frequency in distilled water, each scavenging period cleans 5min by the length of every 1mm alloy bar and calculates；Finally material is centrifuged under the conditions of rotating speed is 1000 turns/min.
Fig. 2 is the foam Fe of porosity 47.88%74Ga27The Magnetostriction curve of magnetostriction materials and block materials, the magnetostriction coefficient of its maximum is 301ppm.
Fig. 3 is for embodiment 1, embodiment 2 and the comparison diagram of block materials Magnetostriction curve.
Claims (4)
1. high-performance macroscopic bubbles state Fe73Ga27Magnetostriction materials, it is characterised in that: Fe73Ga27Magnetostriction materials are macroscopic bubbles state shape, and its pore size is 20-100 μm, and porosity is 30%-50%.
2. high-performance macroscopic bubbles state Fe according to claim 173Ga27The preparation technology of magnetostriction materials, is characterized in that:
1) add scaling loss amount by described composition and carry out dispensing: use vacuum non-consumable arc furnace smelting nut alloy, vacuum non-consumable arc-melting furnace is evacuated to 4*10-3~5*10-3Pa, after pouring 10kPa ar purging, then suction is to 2*10-3~3*10-3Pa；The percent by volume purity of argon is 99.99%；
Being then charged with argon melting to vacuum is 40kPa ~ 50kPa, dispensing is melted under melting electric current 100A ~ 150A, and smelting time is 3min ~ 5min, melt back 4 ~ 5 times, prepares alloy pig,
2) alloy pig molybdenum filament wire cutting machine step 1 melted out cuts into the bulk of 6mm*6mm*10mm, grinds off to ensure non-scale by alloy block surface with sand paper, with ethanol, alloy block surface clean is clean, keeps dry state；
3) sodium metaaluminate and carbamide, mortar are moved to glove box, do not absorb water with sodium metaaluminate when ensureing preparation, weigh the mixture of 20g sodium metaaluminate and carbamide, in mixture, mass percent shared by carbamide is 40% ~ 60%, carbamide and sodium metaaluminate mix after with mortar grinder 30min until the most finely ground and mix homogeneously, removal glove box；
4) select the mould for tabletting press of 0.25 inch inner diameter, the sample of different urea contents is pressed into disk at 30MPa respectively；
5) wafer sample of compacting is respectively put in alumina crucible, puts in Muffle furnace and be sintered, sinter out the column sodium metaaluminate embryo of a diameter of 0.25 inch；Sintering process is: be first raised to 220 DEG C from 20 DEG C with 20min, insulation 180min, carbamide is made fully to evaporate formation hole in sodium metaaluminate embryo, then it is raised to 1500 DEG C of insulation 180min through 150min, the sodium metaaluminate embryo making porous fully sinters, and finally drops to 200 DEG C from 1500 DEG C with 180min;
6) putting in spray to cast container by bulk alloy ingot, spray to cast container is the quartz ampoule of a bottom perforate；Then revolving, with single roller, stove of quenching and carry out copper mold spray to cast, the column sodium metaaluminate embryo gone out by sintering is put in the hole of copper mold, is placed on by copper mold below quartz ampoule, makes to be placed with the hole alignment quartz ampoule bottom end opening of sodium metaaluminate embryo, is evacuated to 2*10-2Pa~2*10-3Pa, is passed through 50kPa argon and does protective atmosphere, be passed through argon post-heating in quartz ampoule, is incubated 30s ~ 60s, in the sodium metaaluminate embryo being ejected in copper mold, it is thus achieved that containing the Fe of sodium metaaluminate after reaching 1300 DEG C ~ 1400 DEG C73Ga27Alloy bar；
7) by the Fe containing sodium metaaluminate73Ga27Alloy bar is put into equipped with in the container of the hydrochloric acid solution that volumetric concentration is 3%, and container is put into supersonic generator, ultrasonic immersion treatment under conditions of supersonic frequency is 40kHz, and ultrasonic soak time is calculated by every 1mm alloy bar 10min；Being taken out by alloy bar after ultrasonic immersion and put into ultrasonic cleaning 3 times under 40kHz supersonic frequency in distilled water, each scavenging period cleans 5min by the length of every 1mm alloy bar and calculates；Finally material is centrifuged under the conditions of rotating speed is 1000 turns/min；Finally give high-performance macroscopic bubbles state Fe73Ga27Magnetostriction materials.
Preparation technology the most according to claim 2, it is characterised in that the quartz ampoule bottom aperture diameter in described step 6) is 0.7mm.
Preparation technology the most according to claim 2, it is characterised in that a diameter of 7mm in the hole of the described copper mold in step 6), obtains the alloy bar of a diameter of 7mm.
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