CN104775068B - A high-performance macroscopic foam Fe73Ga27 magnetostrictive material and its preparation process - Google Patents

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

A high-performance macroscopic foam Fe73Ga27 magnetostrictive material and its preparation process

technical field

The invention belongs to the field of magnetostrictive materials, and relates to a high-performance macroscopically foamed Fe ₇₃ Ga ₂₇ magnetostrictive material and a preparation process thereof.

Background technique

Fe-Ga is a solid solution material formed by Ga atoms and Fe atoms. Its saturation magnetostriction coefficient (single crystal material λs~400 ppm) is more than ten times that of traditional iron-based and nickel-based magnetostrictive materials, and it drives The magnetic field is very low (~100 Oe), only 1/10 of that of terb-dysprosium-iron giant magnetostrictive materials. Compared with traditional rare-earth giant magnetostrictive materials, iron-gallium alloys also have good mechanical properties and magnetostrictive temperature stability (the tensile strength is as high as 500 MPa, which is about 23 times that of terbium-dysprosium-iron alloys; the Curie temperature ~ 675°C, which is 300°C higher than that of terbium-dysprosium-iron alloy, and the magnetostrictive properties can be maintained in a wide temperature range of -20 to 80°C), and it does not contain rare earths, and the material cost is relatively lower.

In recent years, people have done a lot of research work on Fe-Ga magnetostrictive materials theoretically and experimentally, but the mechanism of large magnetostriction of Fe-Ga alloy is still unclear, which limits the further development of magnetostrictive properties. improve.

The study found that the effect of Ga on the magnetic moment of Fe is not a simple dilution effect. The atomic magnetic moment of Fe changes with the content of Ga. The increase of the magnetic moment increases the energy density of the alloy, which leads to an increase in the magnetostrictive strain of the alloy. . Based on this, the research on the reasons for the large magnetostriction of Fe-Ga alloys is mainly divided into two aspects: intrinsic and extrinsic. The intrinsic model is mainly based on the theoretical study of the lattice mismatch phenomenon of Ga-Ga atoms in Fe-Ga alloys, which shows that the magnetostrictive strain in Fe-Ga alloys comes from the second electron coordination shell of Ga atoms Variation of Fe-Ga atomic pairs with Ga–Ga atomic pairs. The intrinsic model believes that the heterogeneity of the nano-tetragonal phase in Fe-Ga causes the material to appear inhomogeneous magnetization, and an effective stray field is generated around the substrate. The magnetization process that requires more energy to move the magnetic domain wall first, thereby enhancing the magnetostrictive performance.

The current related work has proved the existence of nano-tetragonal phases in Fe-Ga alloys, and it is believed that the reorientation and growth of these nano-magnetic domains in a magnetic field is the mechanism leading to the large magnetostrictive properties of Fe-Ga alloys.

The magneto-induced strain mechanism of NiMnGa materials is similar to that of Fe-Ga. People have introduced pores by preparing macro-foam NiMnGa to reduce the hindrance to the movement of martensitic variant twin boundaries, so that the magneto-induced strain of polycrystalline NiMnGa materials has increased from 20ppm to Above 20000ppm. Therefore, the method of introducing pores into macroscopic foam NiMnGa can be introduced into Fe-Ga alloys, which can reduce the hindrance of nanomagnetic domain movement, thereby improving the magnetostrictive properties of Fe-Ga polycrystalline materials.

Contents of the invention

The purpose of the present invention is to provide a high-performance macroscopically foamed Fe ₇₃ Ga ₂₇ magnetostrictive material and its preparation process. The method has large magnetostrictive properties, low drive field, high Excellent mechanical properties, low-cost macroscopic foam Fe ₇₃ Ga ₂₇ magnetostrictive materials.

The purpose of the present invention is achieved in the following ways:

A high-performance macro-foamed Fe ₇₃ Ga ₂₇ magnetostrictive material is in the shape of a macro-foam, with a pore size of 20-100 μm and a porosity of 30%-50%.

The preparation process of the high-performance macroscopic foam state Fe ₇₃ Ga ₂₇ magnetostrictive material is:

1) Dosing according to the composition plus burning loss: use a vacuum non-consumable electric arc furnace to smelt the master alloy, and vacuum the vacuum non-consumable arc melting furnace to 4*10 ^-3 ~5*10 ^-3 Pa, After flushing into the furnace with 10kPa argon gas, then evacuate to 2*10 ^-3 ~3*10 ^-3 Pa; the volume percentage purity of argon is 99.99%. Then fill it with argon and melt until the vacuum degree is 40kPa~50kPa, melt the ingredients under the melting current of 100A~150A, the melting time is 3min~5min, and repeatedly melt 4~5 times to obtain the alloy ingot.

2) Cut the alloy ingot smelted in step 1 into 6mm*6mm*10mm blocks with a molybdenum wire cutting machine, grind off the surface of the alloy block with sandpaper to ensure no scale, and clean the surface of the alloy block with ethanol to keep dry state;

3) Move the sodium metaaluminate, urea, and mortar to the glove box to ensure that the sodium metaaluminate does not absorb water during preparation, weigh 20g of the mixture of sodium metaaluminate and urea, and the mass percentage of urea in the mixture is 40 %~60%, mix urea with sodium metaaluminate and grind it with a mortar for 30 minutes until it is fully ground and mixed evenly, then remove it from the glove box;

4) Select a tablet press mold with an inner diameter of 0.25 inches, and press samples with different urea contents into discs at 30 MPa;

5) Put the pressed disc samples into alumina crucibles, put them into a muffle furnace for sintering, and sinter a columnar sodium metaaluminate embryo with a diameter of 0.25 inches;

6) Put the massive alloy ingot into the spray-casting container, which is a quartz tube with a hole at the bottom; then spray-cast the copper mold with a single-roller rotary quenching furnace, and sinter the columnar sodium metaaluminate embryo Put it into the hole of the copper mold, place the copper mold under the quartz tube, align the hole with the sodium metaaluminate embryo with the opening at the bottom of the quartz tube, and evacuate to 2*10 ^-2 Pa~2*10 ^-3 Pa, 50kPa argon gas is introduced as a protective atmosphere, argon gas is introduced into the quartz tube and heated, after reaching 1300°C~1400°C, it is kept for 30s~60s, and sprayed into the sodium metaaluminate embryo in the copper mold to obtain Sodium Fe ₇₃ Ga ₂₇ alloy rod;

7) Put the Fe ₇₃ Ga ₂₇ alloy rod containing sodium metaaluminate into a container filled with a hydrochloric acid solution with a volume concentration of 3%, put the container into an ultrasonic generator, and perform ultrasonic immersion treatment at an ultrasonic frequency of 40kHz , the ultrasonic immersion time is calculated as 10 minutes per 1 mm alloy rod; after ultrasonic immersion, the alloy rod is taken out and placed in distilled water for ultrasonic cleaning at 40 kHz ultrasonic frequency for 3 times, and each cleaning time is calculated as 5 min per 1 mm alloy rod length; finally, the The material is centrifuged under the condition of rotating speed of 1000 rpm; finally, a high-performance macroscopic foam Fe ₇₃ Ga ₂₇ magnetostrictive material is obtained.

The sintering process in step 5) is as follows: first raise from 20°C to 220°C for 20 minutes, and keep it warm for 180 minutes, so that the urea is fully evaporated to form pores in the sodium metaaluminate embryo, and then rise to 1500°C for 180 minutes after 150 minutes. Fully sinter the porous sodium metaaluminate embryo, and finally cool down from 1500°C to 200°C in 180 minutes.

The diameter of the hole at the bottom of the quartz tube is 0.7mm

The hole diameter of the copper mold is 7 mm, and an alloy rod with a diameter of 7 mm is obtained.

The present invention has the advantages that: the developed macroscopically foamed Fe ₇₃ Ga ₂₇ magnetostrictive material has excellent magnetostrictive properties; the developed macroscopically foamed Fe ₇₃ Ga ₂₇ magnetostrictive material only needs a low driving field and can It is used under a low external magnetic field; the developed macroscopic foam Fe ₇₃ Ga ₂₇ magnetostrictive material has good mechanical properties and corrosion resistance, and can be used in harsh environments; the foam state prepared by the method of the present invention The Fe ₇₃ Ga ₂₇ magnetostrictive material has uniform pores, high magnetostriction coefficient up to 300ppm, simple process and high yield, which is favorable for popularization and application.

Description of drawings

Figure 1 shows the magnetostrictive performance curves of the foamed Fe ₇₄ Ga ₂₇ magnetostrictive material and the Fe ₇₄ Ga ₂₇ bulk material with a porosity of 33.65%.

Figure 2 shows the magnetostrictive performance curves of the foamed Fe ₇₄ Ga ₂₇ magnetostrictive material and the Fe ₇₄ Ga ₂₇ bulk material with a porosity of 47.88%.

Fig. 3 is a comparative diagram of embodiment 1, embodiment 2 and the magnetostrictive performance curves of bulk materials.

detailed description

The present invention will be further described in detail with reference to the accompanying drawings and embodiments.

A high-performance macro-foamed Fe ₇₃ Ga ₂₇ magnetostrictive material is in the shape of a macro-foam, with a pore size of 20-100 μm and a porosity of 30%-50%.

The preparation process of the high-performance macroscopic foam state Fe ₇₃ Ga ₂₇ magnetostrictive material is:

1) Dosing according to the composition plus burning loss: use a vacuum non-consumable electric arc furnace to smelt the master alloy, and vacuum the vacuum non-consumable arc melting furnace to 4*10 ^-3 ~5*10 ^-3 Pa, After flushing into the furnace with 10kPa argon gas, then evacuate to 2*10 ^-3 ~3*10 ^-3 Pa; the volume percentage purity of argon is 99.99%. Then fill it with argon and melt until the vacuum degree is 40kPa~50kPa, melt the ingredients under the melting current of 100A~150A, the melting time is 3min~5min, and repeatedly melt 4~5 times to obtain the alloy ingot.

2) Cut the alloy ingot smelted in step 1 into 6mm*6mm*10mm blocks with a molybdenum wire cutting machine, grind off the surface of the alloy block with sandpaper to ensure no scale, and clean the surface of the alloy block with ethanol to keep dry state;

3) Move the sodium metaaluminate, urea, and mortar to the glove box to ensure that the sodium metaaluminate does not absorb water during preparation, weigh 20g of the mixture of sodium metaaluminate and urea, and the mass percentage of urea in the mixture is 40 %~60%, mix urea with sodium metaaluminate and grind it with a mortar for 30 minutes until it is fully ground and mixed evenly, then remove it from the glove box;

4) Select a tablet press mold with an inner diameter of 0.25 inches, and press samples with different urea contents into discs at 30 MPa;

5) Put the pressed disc samples into alumina crucibles, put them into a muffle furnace for sintering, and sinter a columnar sodium metaaluminate embryo with a diameter of 0.25 inches;

6) Put the massive alloy ingot into the spray-casting container, which is a quartz tube with a hole at the bottom; then spray-cast the copper mold with a single-roller rotary quenching furnace, and sinter the columnar sodium metaaluminate embryo Put it into the hole of the copper mold, place the copper mold under the quartz tube, align the hole with the sodium metaaluminate embryo with the opening at the bottom of the quartz tube, and evacuate to 2*10 ^-2 Pa~2*10 ^-3 Pa, 50kPa argon gas is introduced as a protective atmosphere, argon gas is introduced into the quartz tube and heated, after reaching 1300°C~1400°C, it is kept for 30s~60s, and sprayed into the sodium metaaluminate embryo in the copper mold to obtain Sodium Fe ₇₃ Ga ₂₇ alloy rod;

7) Put the Fe ₇₃ Ga ₂₇ alloy rod containing sodium metaaluminate into a container filled with a hydrochloric acid solution with a volume concentration of 3%, put the container into an ultrasonic generator, and perform ultrasonic immersion treatment at an ultrasonic frequency of 40kHz , the ultrasonic immersion time is calculated as 10 minutes per 1 mm alloy rod; after ultrasonic immersion, the alloy rod is taken out and placed in distilled water for ultrasonic cleaning at 40 kHz ultrasonic frequency for 3 times, and each cleaning time is calculated as 5 min per 1 mm alloy rod length; finally, the The material is centrifuged under the condition of rotating speed of 1000 rpm; finally, a high-performance macroscopic foam Fe ₇₃ Ga ₂₇ magnetostrictive material is obtained.

The sintering process in step 5) is as follows: first raise from 20°C to 220°C for 20 minutes, and keep it warm for 180 minutes, so that the urea is fully evaporated to form pores in the sodium metaaluminate embryo, and then rise to 1500°C for 180 minutes after 150 minutes. Fully sinter the porous sodium metaaluminate embryo, and finally cool down from 1500°C to 200°C in 180 minutes.

The diameter of the hole at the bottom of the quartz tube is 0.7mm

The hole diameter of the copper mold is 7 mm, and an alloy rod with a diameter of 7 mm is obtained.

Embodiment 1: the foam Fe of preparation porosity 33.65% ₇₃ Ga ₂₇ alloy

Use an electronic balance to take the raw materials required for the design composition, and add 3wt% more Ga burning loss, with a total weight of 40g, of which 99.99% purity Fe and 99.99% Ga are used, and the prepared raw materials are placed in a vacuum for non-consumption Arc melting furnace.

Vacuumize the non-consumable arc melting furnace to 5*10 ^-3 Pa, flush the furnace with 10kPa argon gas, and then evacuate to 3*10 ^-3 Pa; the volume percentage purity of argon is 99.99%.

Then fill it with argon to melt to a vacuum degree of 50kPa, and melt the ingredients at a melting current of 100A~150A. The melting time is 5 minutes, and the melting is repeated 5 times to obtain an alloy ingot.

The purpose of smelting 5 times is to ensure the uniformity of the composition of the alloy ingot.

Process the alloy ingot into a 6mm*6mm*10mm cuboid sample with a molybdenum wire cutting machine

Put the alloy sample into ethanol, and ultrasonically clean it for 10 minutes under the condition of 50kHz. After cleaning, put it into an oven and dry it at 80°C for 30 minutes to obtain a clean sample.

Sodium metaaluminate, urea, mortar, etc. were moved to the glove box to ensure that the sodium metaaluminate did not absorb water during preparation, and a 20g sample with a total weight was weighed according to the mass ratio of 40% urea. After mixing urea and sodium metaaluminate, grind it with a mortar for 30 minutes until it is fully ground and mixed evenly, then remove it from the glove box;

Select a tablet press mold with an inner diameter of 0.25 inches, and press the sample with 40% urea content into a disc at 30MPa;

Put the pressed disc samples into alumina crucibles respectively, put them into a muffle furnace for sintering, first raise the temperature from 20°C to 220°C for 20 minutes, and keep it warm for 180 minutes, so that urea is fully evaporated to form pores in the sodium metaaluminate embryo , and then raised to 1500°C for 150 minutes and held for 180 minutes to fully sinter the porous sodium metaaluminate embryo, and finally lowered from 1500°C to 200°C for 180 minutes to sinter a columnar sodium metaaluminate embryo with a diameter of 0.25 inches;

Put the massive alloy ingot into the spray-casting container, which is a quartz tube with a hole at the bottom; then use a single-roller rotary quenching furnace for copper mold spray-casting, and put the sintered sodium metaaluminate columnar embryo into the In the hole of the copper mold. Place the copper mold under the quartz tube so that the hole with the sodium metaaluminate embryo is aligned with the opening at the bottom of the quartz tube, vacuumize to 3*10 ^-3 Pa, pass in 50kPa argon as a protective atmosphere, and pass through the quartz tube After entering the argon gas and heating, the alloy solution reaches 1350°C and is kept for 40s, and sprayed into the sodium metaaluminate embryo in the copper mold to obtain an alloy rod containing sodium metaaluminate.

Put the alloy rod containing sodium metaaluminate into a container filled with a hydrochloric acid solution with a volume concentration of 3%, put the container into an ultrasonic generator, and perform ultrasonic soaking treatment at an ultrasonic frequency of 40kHz. 1mm alloy rod is calculated for 10 minutes; after ultrasonic immersion, the alloy rod is taken out and placed in distilled water for 3 times of ultrasonic cleaning at 40kHz ultrasonic frequency, and the cleaning time for each time is calculated according to the length of each 1mm alloy rod for 5 minutes; finally, the material is cleaned at a speed of 1000 rpm Centrifuge under the condition of /min.

Figure 1 shows the magnetostrictive performance curves of the foamed Fe ₇₄ Ga ₂₇ magnetostrictive material and bulk material with a porosity of 33.65%. The maximum magnetostrictive coefficient of the foamed Fe ₇₄ Ga ₂₇ magnetostrictive material is 319ppm.

Embodiment 2: the foam Fe of preparation porosity 47.88% ₇₃ Ga ₂₇ alloy

Use an electronic balance to take the raw materials required for the design composition, and add 3wt% more Ga burning loss, with a total weight of 40g, of which 99.99% purity Fe and 99.99% Ga are used, and the prepared raw materials are placed in a vacuum for non-consumption Electric arc melting furnace.

Vacuumize the non-consumable arc melting furnace to 5*10 ^-3 Pa, flush the furnace with 10kPa argon gas, and then evacuate to 3*10 ^-3 Pa; the volume percentage purity of argon is 99.99%.

Then fill it with argon to melt to a vacuum degree of 50kPa, and melt the ingredients at a melting current of 100A~150A. The melting time is 5 minutes, and the melting is repeated 5 times to obtain an alloy ingot.

The purpose of smelting 5 times is to ensure the uniformity of the composition of the alloy ingot.

Process the alloy ingot into a 6mm*6mm*10mm cuboid sample with a molybdenum wire cutting machine

Put the alloy sample into ethanol, and ultrasonically clean it for 10 minutes under the condition of 50kHz. After cleaning, put it into an oven and dry it at 80°C for 30 minutes to obtain a clean sample.

Sodium metaaluminate, urea, mortar, etc. were moved to the glove box to ensure that the sodium metaaluminate did not absorb water during preparation, and a 20g sample with a total weight was weighed according to the mass ratio of 60% urea. After mixing urea and sodium metaaluminate, grind it with a mortar for 30 minutes until it is fully ground and mixed evenly, then remove it from the glove box;

Select a tablet press mold with an inner diameter of 0.25 inches, and press the sample with 60% urea content into a disc at 30MPa;

Put the pressed disc samples into alumina crucibles respectively, put them into a muffle furnace for sintering, first raise the temperature from 20°C to 220°C for 20 minutes, and keep it warm for 180 minutes, so that urea is fully evaporated to form pores in the sodium metaaluminate embryo , and then raised to 1500°C for 150 minutes and held for 180 minutes to fully sinter the porous sodium metaaluminate embryo, and finally lowered from 1500°C to 200°C for 180 minutes to sinter a columnar sodium metaaluminate embryo with a diameter of 0.25 inches;

Put the massive alloy ingot into the spray-casting container, which is a quartz tube with a hole at the bottom; then use a single-roller rotary quenching furnace for copper mold spray-casting, and put the sintered sodium metaaluminate columnar embryo into the In the hole of the copper mold. Place the copper mold under the quartz tube so that the hole with the sodium metaaluminate embryo is aligned with the opening at the bottom of the quartz tube, vacuumize to 3*10 ^-3 Pa, pass in 50kPa argon as a protective atmosphere, and pass through the quartz tube After entering the argon gas and heating, the alloy solution reaches 1350°C and is kept warm for 40s, and is sprayed into the sodium metaaluminate embryo in the copper mold to obtain an alloy rod containing sodium metaaluminate.

Put the alloy rod containing sodium metaaluminate into a container filled with a hydrochloric acid solution with a volume concentration of 3%, put the container into an ultrasonic generator, and perform ultrasonic soaking treatment at an ultrasonic frequency of 40kHz. 1mm alloy rod is calculated for 10 minutes; after ultrasonic immersion, the alloy rod is taken out and placed in distilled water for 3 times of ultrasonic cleaning at 40kHz ultrasonic frequency, and the cleaning time for each time is calculated according to the length of each 1mm alloy rod for 5 minutes; finally, the material is cleaned at a speed of 1000 rpm Centrifuge under the condition of /min.

Figure 2 shows the magnetostrictive performance curves of the foamed Fe ₇₄ Ga ₂₇ magnetostrictive material and bulk material with a porosity of 47.88%, and the maximum magnetostrictive coefficient is 301ppm.

Fig. 3 is a comparative diagram of embodiment 1, embodiment 2 and the magnetostrictive performance curves of bulk materials.

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.