Magnetostrictive composite materials, their preparation methods and applications
By preparing rare earth-iron-based alloy strips with a single crystal orientation and alternating layers of insulating organic polymers using the strip spinning method, the problems of random crystal orientation and eddy current effect in rare earth-iron-based alloys are solved, thereby improving magnetostrictive properties and compressive strength, making them suitable for magnetic induction devices.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- TSINGHUA UNIVERSITY
- Filing Date
- 2022-08-01
- Publication Date
- 2026-05-26
AI Technical Summary
Rare earth-iron-based magnetostrictive materials suffer from problems such as random crystal orientation, poor magnetostrictive properties, low compressive strength, and severe eddy current effects, making them difficult to apply to magnetic induction devices.
Alloy strips were prepared by the strip spinning method, with preferred orientation along the same crystal direction, and alternately stacked with insulating organic polymer layers to form a magnetostrictive composite material.
It improves the density, compressive strength and magnetostriction coefficient of magnetostrictive composite materials, while reducing the eddy current effect.
Smart Images
Figure CN115206615B_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of magnetic materials, and more specifically, to a magnetostrictive composite material, its preparation method, and its application. Background Technology
[0002] Magnetostrictive transducers can convert electrical energy into magnetic energy and mechanical / acoustic energy, and can be applied in military and civilian fields such as sonar systems, ultrasonic welding / flaw detection / cleaning, and sound-generating devices. Rare-earth-iron-based alloys, due to their saturation magnetostriction coefficient being tens of times higher than that of traditional magnetostrictive alloys, are known as supermagnetostrictive materials. New transducers based on rare-earth-iron-based designs will gradually replace those based on traditional magnetostrictive materials to improve output performance in terms of vibration frequency, amplitude, and sound wave propagation range.
[0003] The component is Tb x Dy 1-x Fe y Rare-earth-iron-based supermagnetic-strictive materials (where 0.27≤x≤0.30, 1.90≤y≤2.10), commercially known as Terfenol-D, have a large magnetostriction coefficient and low magnetocrystalline anisotropy, making them ideal materials for fabricating magnetostrictive transducers. However, due to the magnetocrystalline anisotropy of the magnetic Laves phase ((Tb,Dy)Fe2), the magnetostriction coefficient of alloys with the Laves phase oriented in different directions varies considerably.
[0004] Obtaining magnetostrictive materials with a single orientation is an effective method to improve the magnetostriction coefficient. Existing studies have employed techniques such as directional solidification, powder metallurgy, and magnetic field-assisted material preparation to control the crystal growth behavior of rare-earth-iron-based alloys, resulting in Laves phase-dependent magnetostrictive materials. <110> or <112> Preferred orientation alloys. However, rare earth-iron-based alloys are brittle and difficult to machine; moreover, their low resistivity leads to severe eddy current losses during prolonged operation under alternating electromagnetic fields, reducing transducer efficiency. Summary of the Invention
[0005] Therefore, it is necessary to provide a magnetostrictive composite material that can improve the magnetostriction coefficient while reducing the eddy current effect, as well as its preparation method and application.
[0006] This application provides a method for preparing a magnetostrictive composite material, which includes the following steps:
[0007] Provide (Tb) x Dy 1-x )Fe y M zAlloy, wherein M includes one or more of Pr, Sm, Ho, Al, Cu, V, Si, Mn, Ni, Co, Ti, Cr, Zr, Zn and Nb, 0.25≤x≤0.35, 1.80≤y≤2.20, 0≤z≤0.2;
[0008] Using the belt-swing method to (Tb) x Dy 1-x )Fe y M z The alloy is melted and sprayed onto the surface of a rotating copper roller to prepare an alloy strip. In the thickness direction of the alloy strip, the (Tb) x Dy 1-x )Fe y M z The magnetic phases in the alloy are preferentially oriented along the same crystal direction; and
[0009] The alloy strip and the insulating organic polymer layer are alternately stacked to form a laminate.
[0010] In one embodiment, the (Tb) x Dy 1-x )Fe y M z Magnetic phase in alloy <110> or <112> Preferred orientation of crystal direction.
[0011] In one embodiment, the alloy strip has a thickness of 45μm to 1000μm and a width of 1mm to 20mm.
[0012] In one embodiment, the thickness of each insulating organic polymer layer in the laminate is independently 20 μm to 500 μm.
[0013] In one embodiment, the material of each insulating organic polymer layer in the laminate is independently selected from one or more of epoxy resin, phenolic resin, phenolic resin, polymethyl methacrylate, and polyvinyl acetal.
[0014] In one embodiment, when preparing the alloy strip, the copper roller satisfies at least one of the following characteristics:
[0015] (1) The rotation speed is 50 r / min to 600 r / min;
[0016] (2) The interior is filled with water or liquid nitrogen.
[0017] In one embodiment, in the (Tb x Dy 1-x )Fe y M zIn the alloy, the volume percentage of the magnetic phase (Tb,Dy)Fe2 is ≥90%.
[0018] In one embodiment, the (Tb) x Dy 1-x )Fe y M z The specific process parameters for alloy melting are as follows:
[0019] The vacuum level of the belt spinning furnace should be ≤2.5×10⁻⁶. -3 Pa, the protective gas is introduced to regulate the pressure to 0.015MPa~0.030MPa.
[0020] In one embodiment, the (Tb) x Dy 1-x )Fe y M z The alloy was produced using a suspension melting process;
[0021] Optionally, the parameters of the suspension melting process are as follows: the vacuum degree of the suspension melting furnace is adjusted to ≤2.5×10⁻⁶. -3 Pa, the protective gas is introduced to regulate the pressure to 0.015MPa~0.030MPa.
[0022] In one aspect, this application also provides a magnetostrictive composite material, which is prepared by the method for preparing magnetostrictive composite materials as described above.
[0023] In another aspect, this application further provides a magnetic sensing device comprising the magnetostrictive composite material described above;
[0024] Optionally, the magnetic sensing device includes a transducer, an actuator, or a sensor.
[0025] This invention has found through research that the granular magnetostrictive composite material prepared by mixing rare earth-iron-based alloy particles and organic polymers has defects such as random crystal orientation, poor magnetostrictive performance and low compressive strength, making it difficult to apply in practical devices (such as transducers).
[0026] The above-mentioned method for preparing magnetostrictive composite materials involves using a strip spinning method to rapidly cool and control the preferred orientation of a magnetic Laves phase with magnetocrystalline anisotropy along the same crystal direction using a copper roller, thereby obtaining an alloy strip with a single crystal orientation. The alloy strip with a single orientation is then alternately stacked with an insulating organic polymer layer to obtain a magnetostrictive composite material with preferred orientation in different directions. The magnetostrictive composite material has high density, compressive strength, and magnetostriction coefficient, while exhibiting low eddy current effect. Attached Figure Description
[0027] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0028] Figure 1 Here is a photograph of the magnetostrictive composite material prepared in Example 1;
[0029] Figure 2 The XRD diffraction pattern of the magnetostrictive composite material prepared in Example 1;
[0030] Figure 3 The magnetostriction curve of the magnetostrictive composite material prepared in Example 1 under no compressive stress is shown.
[0031] Figure 4 The XRD diffraction pattern of the magnetostrictive composite material prepared in Example 2;
[0032] Figure 5 The magnetostriction curve of the magnetostrictive composite material obtained in Example 2 under no compressive stress is shown.
[0033] Figure 6 The image shows the magnetostriction curve of the magnetostrictive composite material prepared in Example 3 under no compressive stress. Detailed Implementation
[0034] Reference will now be made to detailed embodiments of the present invention, one or more of which are described below. Each example is provided for explanation and not for limitation of the invention. In fact, it will be apparent to those skilled in the art that various modifications and variations can be made to the invention without departing from its scope or spirit. For example, features described or illustrated as part of one embodiment may be used in another embodiment to produce further embodiments.
[0035] Therefore, this invention is intended to cover such modifications and variations falling within the scope of the appended claims and their equivalents. Other objects, features, and aspects of the invention are disclosed in or will be apparent from the following detailed description. It will be understood by those skilled in the art that this discussion is merely a description of exemplary embodiments and is not intended to limit the broader aspects of the invention.
[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. The term “and / or” as used herein includes any and all combinations of one or more of the associated listed items. In the description of the invention, “a plurality” means at least two, such as two, three, etc., unless otherwise expressly specified. The terms “comprising,” “including,” “having,” “containing,” or any other variations thereof as used herein are intended to cover non-exclusive inclusion. For example, a composition, step, method, article, or apparatus comprising the listed elements is not necessarily limited to those elements but may include other elements not expressly listed or elements inherent to such a composition, step, method, article, or apparatus.
[0037] Unless otherwise shown or indicated in the operational embodiments, all figures used to represent the amounts, physicochemical properties, etc., of ingredients in the specification and claims are to be understood to be adjusted by the term "about" in all cases. For example, therefore, unless stated to the contrary, the numerical parameters listed in the foregoing specification and appended claims are approximations, and those skilled in the art can appropriately modify these approximations to obtain the desired characteristics by utilizing the teachings disclosed herein. The use of numerical ranges indicated by endpoints includes all numbers within that range and any range within that range; for example, 1 to 5 includes 1, 1.1, 1.3, 1.5, 2, 2.75, 3, 3.80, 4, and 5, etc.
[0038] Laves phase refers to cubic intermetallic compounds with a MgCu2-type structure, and in this invention, it can specifically refer to the magnetic (Tb,Dy)Fe2 phase.
[0039] It is understandable that traditional methods for preparing magnetostrictive composite materials result in difficult-to-mold magnetostrictive composites with severe eddy current effects. Furthermore, the magnetostriction of magnetostrictive composites typically originates from rare-earth-iron-based alloy particles, leading to random internal crystal orientation, poor magnetostrictive properties, and low compressive strength, making them unsuitable for practical application in magnetic sensing devices. Therefore, this application provides a method for preparing magnetostrictive composite materials. This method employs a strip-spinning method, using a copper roller to rapidly cool and control the preferred orientation of the magnetic Laves phase with magnetocrystalline anisotropy along the same crystal direction to obtain a composite material with a single crystal orientation. <110> or <112> By alternating layers of alloy strips with a single orientation and insulating organic polymer layers, a magnetostrictive composite material with preferred orientation in different directions was prepared. The magnetostrictive composite material has high density, compressive strength and magnetostriction coefficient, while the eddy current effect is low.
[0040] The primary objective of this application is to provide a method for preparing a magnetostrictive composite material, comprising the following steps:
[0041] Provide (Tb) x Dy 1-x )Fe y M z The alloy, wherein M includes one or more of Pr (praseodymium), Sm (samarium), Ho (holmium), Al (aluminum), Cu (copper), V (vanadium), Si (silicon), Mn (manganese), Ni (nickel), Co (cobalt), Ti (titanium), Cr (chromium), Zr (zirconium), Zn (zinc) and Nb (niobium), 0.25≤x≤0.35, 1.80≤y≤2.20, 0≤z≤0.2;
[0042] Using the belt-swing method to (Tb) x Dy 1-x )Fe y M z The alloy is melted and sprayed onto the surface of a rotating copper roller to prepare an alloy strip. In the thickness direction of the alloy strip, (Tb x Dy 1-x )Fe y M z The magnetic phases in the alloy are preferentially oriented along the same crystal direction; and
[0043] Alloy strips and insulating organic polymer layers are alternately stacked to form a laminate.
[0044] In some implementations, (Tb x Dy 1-x )Fe y M z Magnetic phase in alloy <110> or <112> Preferred orientation of crystal direction.
[0045] In some embodiments, the thickness and width of the alloy strip are not limited. For example, the thickness of the alloy strip can be any value between 45μm and 1000μm, or it can be 50μm, 80μm, 100μm, 120μm, 150μm, 200μm, 250μm, 280μm, 300μm, 330μm, 360μm, 400μm, 500μm, 600μm, 700μm, 800μm, or 900μm; the width of the alloy strip can be any value between 1mm and 20mm, or it can be 2mm, 3mm, 5mm, 8mm, 10mm, 12mm, 15mm, or 18mm.
[0046] In some embodiments, the thickness of each insulating organic polymer layer in the laminate can be independently 20 μm to 500 μm, for example, it can also be 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, 110 μm, 120 μm, 130 μm, 140 μm, 150 μm, 160 μm, 170 μm, 180 μm, 190 μm, 200 μm, 250 μm, 300 μm, 350 μm, 400 μm, or 450 μm.
[0047] In some embodiments, the thickness of the laminate can be any value between 5 mm and 30 mm, for example, it can also be 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, 25 mm, or 29 mm.
[0048] In some embodiments, the material of each insulating organic polymer layer in the laminate is not limited, and any insulating organic polymer material known in the art can be selected, preferably an insulating organic polymer material that can be used as an adhesive, specifically selected from one or more of epoxy resin, phenolic resin, phenolic resin, polymethyl methacrylate and polyvinyl alcohol acetal.
[0049] Preferably, the insulating polymer material is epoxy resin, such as E44 type epoxy resin, bisphenol S type epoxy resin, E51 type epoxy resin, H type epoxy resin, etc.
[0050] In some embodiments, the method of forming the laminate is not limited. For example, the insulating polymer can be coated onto the surface of the alloy strip, or the alloy strip can be laminated and then immersed in a solution of the insulating polymer material. It is understood that the process of forming the laminate may also include a curing step to cure the insulating polymer material into shape.
[0051] In some embodiments, the rotation speed of the copper roller can be any value between 50 r / min and 600 r / min, for example, it can also be 80 r / min, 100 r / min, 120 r / min, 150 r / min, 180 r / min, 200 r / min, 220 r / min, 250 r / min, 280 r / min, 300 r / min, 320 r / min, 330 r / min, 350 r / min, 380 r / min, 400 r / min, or 500 r / min.
[0052] In some embodiments, the copper roller is filled with water or liquid nitrogen. By filling the copper roller with water or liquid nitrogen, the alloy strip can be rapidly cooled and its internal crystals can be aligned along the same crystal direction. Preferably, cooling circulating water circulates inside the copper roller, with a water temperature of 16°C to 25°C.
[0053] In some implementations, in (Tb x Dy 1-x )Fe y M z In the alloy, the volume percentage of the magnetic phase (Tb,Dy)Fe2 is ≥90%.
[0054] In some implementations, (Tb) x Dy 1-x )Fe y M z The specific process parameters for alloy melting are as follows:
[0055] The vacuum level of the belt spinning furnace should be ≤2.5×10⁻⁶. -3 Pa, the pressure is adjusted to 0.015 MPa to 0.030 MPa by introducing inert gas. The inert gas can be argon and / or helium.
[0056] Furthermore, (Tb) x Dy 1-x )Fe y M z The heating process used for alloy melting can be smelting or high-frequency induction melting.
[0057] In some implementations, a belt-spinning furnace is used for melting (Tb). x Dy 1-x )Fe y M z The crucible used for the alloy can be a quartz crucible, and preferably, the nozzle width of the quartz crucible can be 1mm to 20mm.
[0058] In some implementations, (Tb x Dy 1-x )Fe y M z There are no restrictions on the preparation process of the alloy; any recognized preparation process in the field can be used. For example, a suspension melting process can be used, and the specific parameters of the suspension melting process can be as follows:
[0059] The vacuum level of the suspension melting furnace should be controlled to ≤2.5×10⁻⁶. -3 Pa, the pressure is adjusted to 0.015 MPa to 0.030 MPa by introducing inert gas. The inert gas can be argon and / or helium.
[0060] In one aspect, this application also provides a magnetostrictive composite material, which is prepared by the method for preparing magnetostrictive composite materials as described above.
[0061] In another aspect, this application provides a magnetic sensing device comprising the magnetostrictive composite material described above.
[0062] In some implementations, the magnetic sensing device can be a transducer, actuator, or sensor.
[0063] The present invention will be further described in detail below with reference to specific embodiments.
[0064] Example 1: Preparation of Magnetostrictive Composite Material
[0065] 1) Tb was prepared using a suspension melting process. 0.3 Dy 0.7 Fe2 alloy ingots;
[0066] 2) Tb 0.3 Dy 0.7 Fe2 alloy ingots are placed in the induction coil of a vacuum spinning furnace and evacuated to a vacuum level ≤ 2.0 × 10⁻⁶. -3 Pa, then argon gas is introduced until the pressure inside the furnace is 0.020 MPa;
[0067] 3) Under argon protection conditions, medium-frequency induction heating of Tb 0.3 Dy 0.7 Fe2 alloy ingots were melted; then the molten liquid alloy was sprayed onto a water-cooled copper roller rotating at 300 r / min to obtain Tb with a thickness of 200 μm and a width of 1.5 mm. 0.3 Dy 0.7 Fe2 alloy strip;
[0068] 4) Take the Tb obtained in step 3) 0.3 Dy 0.7 Fe2 alloy strips are alternately stacked with 200μm thick E44 type epoxy resin layers along their length to form a 15mm thick laminate. After standing for 2 hours, the desired result is obtained. Figure 1 The magnetostrictive composite material is shown. The XRD pattern of this magnetostrictive composite material is as follows. Figure 2 As shown. By Figure 2 It can be seen that, in the thickness direction of the magnetostrictive composite material, the magnetic phase is along... <110> Preferred crystal orientation. The magnetostrictive properties of this magnetostrictive composite material were tested using the standard resistance strain gauge method, and the results were as follows: Figure 3The magnetostriction curve shown has a saturation magnetostriction coefficient of 719 ppm. Tested according to GB / T7314-2017 standard, the room temperature compressive strength of this composite material is 45 MPa. The insulating organic polymer can interrupt the ferromagnetic circuit generated by eddy currents, effectively reducing eddy current losses in the magnetostrictive material under alternating magnetic fields.
[0069] Example 2: Preparation of Magnetostrictive Composite Material
[0070] 1) Tb was prepared using a suspension melting process. 0.27 Dy 0.73 Fe 1.95 alloy ingots;
[0071] 2) Tb 0.27 Dy 0.73 Fe 1.95 The alloy ingot is placed in the induction coil of a vacuum spinning furnace, and a vacuum is drawn until the vacuum level is ≤2.0×10⁻⁶. -3 Pa, then argon gas is introduced until the pressure inside the furnace is 0.030 MPa;
[0072] 3) Under argon protection conditions, medium-frequency induction heating of Tb 0.27 Dy 0.73 Fe 1.95 The alloy ingot was melted; then the molten liquid alloy was sprayed onto a water-cooled copper roller rotating at 400 r / min to obtain a Tb layer with a thickness of 150 μm and a width of 1.0 mm. 0.27 Dy 0.73 Fe 1.95 Alloy strip;
[0073] 4) Take the Tb obtained in step 3) 0.27 Dy 0.73 Fe 1.95 Alloy strips were alternately stacked with 150 μm thick bisphenol S-type epoxy resin layers along their length to form a 16 mm thick laminate. After standing for 5 hours, a magnetostrictive composite material was obtained. The XRD curve of this magnetostrictive composite material was tested, as shown below. Figure 4 As shown. By Figure 4 It can be seen that, in the thickness direction of the magnetostrictive composite material, the magnetic phase is along... <112> Preferred crystal orientation. The magnetostrictive properties of this magnetostrictive composite material were tested using the standard resistance strain gauge method, and the results were as follows: Figure 5 The magnetostriction curve shown has a saturation magnetostriction coefficient of 659 ppm. According to GB / T7314-2017 standard, the room temperature compressive strength of this composite material is 60 MPa. The insulating organic polymer can interrupt the ferromagnetic circuit generated by eddy currents, effectively reducing eddy current losses in the magnetostrictive material under alternating magnetic fields.
[0074] Example 3: Preparation of Magnetostrictive Composite Material
[0075] 1) Tb was prepared using a suspension melting process. 0.27 Dy 0.73 Fe 1.95 Al 0.05 alloy ingots;
[0076] 2) Tb 0.27 Dy 0.73 Fe 1.95 Al 0.05 The alloy ingot is placed in the induction coil of a vacuum spinning furnace, and a vacuum is drawn until the vacuum level is ≤2.0×10⁻⁶. -3 Pa, then argon gas is introduced until the pressure inside the furnace is 0.025 MPa;
[0077] 3) Under argon protection conditions, medium-frequency induction heating of Tb 0.27 Dy 0.73 Fe 1.95 Al 0.05 The alloy ingot was melted; then the molten liquid alloy was sprayed onto a water-cooled copper roller rotating at 450 r / min to obtain a Tb layer with a thickness of 120 μm and a width of 1.4 mm. 0.27 Dy 0.73 Fe 1.95 Al 0.05 Alloy strip;
[0078] 4) Take the Tb obtained in step 3) 0.27 Dy 0.73 Fe 1.95 Al 0.05 Alloy strips were alternately stacked with 50 μm thick E51 epoxy resin layers along their length to form a 10 mm thick laminate. After standing for 6 hours, a magnetostrictive composite material was obtained. XRD testing of this magnetostrictive composite material revealed that the magnetic phase was along the thickness direction of the composite material. <112> Preferred crystal orientation. The magnetostrictive properties of this magnetostrictive composite material were tested using the standard resistance strain gauge method, and the results were as follows: Figure 6 The magnetostriction curve shown has a saturation magnetostriction coefficient of 628 ppm. Tested according to GB / T 7314-2017 standard, the room temperature compressive strength of this composite material is 59 MPa. The insulating organic polymer can interrupt the ferromagnetic loop generated by eddy currents, effectively reducing eddy current losses in the magnetostrictive material under alternating magnetic fields.
[0079] Example 4: Preparation of Magnetostrictive Composite Material
[0080] 1) Tb was prepared using a suspension melting process. 0.27 Dy 0.73 Fe 1.95 Pr0.03 alloy ingots;
[0081] 2) Tb 0.27 Dy 0.73 Fe 1.95 Pr 0.03 The alloy ingot is placed in the induction coil of a vacuum spinning furnace, and a vacuum is drawn until the vacuum level is ≤1.5×10⁻⁶. -3 Pa, then argon gas is introduced until the pressure inside the furnace is 0.030 MPa;
[0082] 3) Under argon protection conditions, medium-frequency induction heating of Tb 0.27 Dy 0.73 Fe 1.95 Pr 0.03 The alloy ingot was melted; then the molten liquid alloy was sprayed onto a water-cooled copper roller rotating at 300 r / min to obtain a Tb layer with a thickness of 250 μm and a width of 1.2 mm. 0.27 Dy 0.73 Fe 1.95 Pr 0.03 Alloy strip;
[0083] 4) Take the Tb obtained in step 3) 0.27 Dy 0.73 Fe 1.95 Pr 0.03 Alloy strips were alternately stacked with 100 μm thick E44 epoxy resin layers along their length to form a 20 mm thick laminate. After standing for 3 hours, a magnetostrictive composite material was obtained. XRD testing of this magnetostrictive composite material revealed that the magnetic phase was along the thickness direction of the composite material. <110> Preferred crystal orientation. The magnetostrictive properties of this magnetostrictive composite material were tested using the standard resistance strain gauge method, and its saturation magnetostriction coefficient was 631 ppm. According to GB / T 7314-2017 standard, the room temperature compressive strength of this composite material was 63 MPa. The insulating organic polymer can interrupt the ferromagnetic circuit generated by eddy currents, effectively reducing eddy current losses in the magnetostrictive material under alternating magnetic fields.
[0084] Example 5: Preparation of Magnetostrictive Composite Material
[0085] 1) Tb was prepared using a suspension melting process. 0.27 Dy 0.73 Fe 1.95 Al 0.02 Cu 0.01 alloy ingots;
[0086] 2) Tb 0.27 Dy 0.73 Fe 1.95 Al 0.02 Cu0.01 The alloy ingot is placed in the induction coil of a vacuum spinning furnace, and a vacuum is drawn until the vacuum degree is ≤3.0×10⁻⁶. -3 Pa, then argon gas is introduced until the pressure inside the furnace is 0.025 MPa;
[0087] 3) Under argon protection conditions, medium-frequency induction heating of Tb 0.27 Dy 0.73 Fe 1.95 Al 0.02 Cu 0.01 The alloy ingot was melted; then the molten liquid alloy was sprayed onto a water-cooled copper roller rotating at 350 r / min to obtain a Tb layer with a thickness of 160 μm and a width of 1.1 mm. 0.27 Dy 0.73 Fe 1.95 Al 0.02 Cu 0.01 Alloy strip;
[0088] 4) Take the Tb obtained in step 3) 0.27 Dy 0.73 Fe 1.95 Al 0.02 Cu 0.01 Alloy strips were alternately stacked with 180 μm thick H-type epoxy resin layers along their length to form a 15 mm thick laminate. After standing for 6 hours, a magnetostrictive composite material was obtained. XRD testing of this magnetostrictive composite material revealed that the magnetic phase was along the thickness direction of the composite material. <110> Preferred crystal orientation. The magnetostrictive properties of this magnetostrictive composite material were tested using the standard resistance strain gauge method, and its saturation magnetostriction coefficient was 616 ppm. According to GB / T 7314-2017 standard, the room temperature compressive strength of this composite material was 57 MPa. The insulating organic polymer can interrupt the ferromagnetic circuit generated by eddy currents, effectively reducing eddy current losses in the magnetostrictive material under alternating magnetic fields.
[0089] Example 6: Preparation of Magnetostrictive Composite Material
[0090] 1) Tb was prepared using a suspension melting process. 0.27 Dy 0.73 Fe 1.95 Ti 0.01 Ni 0.01 alloy ingots;
[0091] 2) Tb 0.27 Dy 0.73 Fe 1.95 Ti 0.01 Ni 0.01 The alloy ingot is placed in the induction coil of a vacuum spinning furnace, and a vacuum is drawn until the vacuum level is ≤1.8×10⁻⁶. -3Pa, then argon gas is introduced until the pressure inside the furnace is 0.022 MPa;
[0092] 3) Under argon protection conditions, medium-frequency induction heating of Tb 0.27 Dy 0.73 Fe 1.95 Ti 0.01 Ni 0.01 The alloy ingot was melted; then the molten liquid alloy was sprayed onto a water-cooled copper roller rotating at 400 r / min to obtain a Tb layer with a thickness of 180 μm and a width of 1.2 mm. 0.27 Dy 0.73 Fe 1.95 Ti 0.01 Ni 0.01 Alloy strip;
[0093] 4) Take the Tb obtained in step 3) 0.27 Dy 0.73 Fe 1.95 Ti 0.01 Ni 0.01 Alloy strips were alternately stacked with 100 μm thick E44 epoxy resin layers along their length to form an 18 mm thick laminate. After standing for 3.5 hours, a magnetostrictive composite material was obtained. XRD testing of this magnetostrictive composite material revealed that the magnetic phase was along the thickness direction of the composite material. <112> Preferred crystal orientation. The magnetostrictive properties of this magnetostrictive composite material were tested using the standard resistance strain gauge method, and its saturation magnetostriction coefficient was 605 ppm. According to GB / T 7314-2017 standard, the room temperature compressive strength of this composite material was 68 MPa. The insulating organic polymer can interrupt the ferromagnetic circuit generated by eddy currents, effectively reducing eddy current losses in the magnetostrictive material under alternating magnetic fields.
[0094] The formulation parameters for preparing the magnetostrictive composite materials in Examples 1-6 above are shown in Table 1:
[0095] Table 1
[0096]
[0097] The performance test results of the magnetostrictive composite materials prepared in Examples 1 to 6 above are shown in Table 2:
[0098] Table 2
[0099] Serial Number Orientation Crystal Direction Magnetostriction coefficient (ppm) Compressive strength (MPa) Example 1 <110> 719 45 Example 2 <112> 659 60 Example 3 <112> 628 59 Example 4 <110> 631 63 Example 5 <110> 616 57 Example 6 <112> 605 68
[0100] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0101] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.
Claims
1. A method for preparing a magnetostrictive composite material, characterized in that, Includes the following steps: Provide (Tb) x Dy 1-x )Fe y M z Alloy, wherein M includes one or more of Pr, Sm, Ho, Al, Cu, V, Si, Mn, Ni, Co, Ti, Cr, Zr, Zn and Nb, 0.25≤x≤0.35, 1.80≤y≤2.20, 0≤z≤0.2; Using the belt-swing method to (Tb x Dy 1-x )Fe y M z The alloy is melted and sprayed onto the surface of a rotating copper roller to prepare an alloy strip. In the thickness direction of the alloy strip, the (Tb) x Dy 1-x )Fe y M z The magnetic phases in the alloy are preferentially oriented along the same crystal direction; and The alloy strip and the insulating organic polymer layer are alternately stacked to form a laminate; The thickness of the alloy strip is 45 μm to 1000 μm; the thickness of each insulating organic polymer layer in the laminate is independently 20 μm to 500 μm.
2. The method for preparing the magnetostrictive composite material according to claim 1, characterized in that, The (Tb) x Dy 1-x )Fe y M z Magnetic phase in alloy <110> or <112> Preferred orientation of crystal direction.
3. The method for preparing the magnetostrictive composite material according to claim 1, characterized in that, The width of the alloy strip is 1 mm to 20 mm.
4. The method for preparing the magnetostrictive composite material according to claim 1, characterized in that, The material of each insulating organic polymer layer in the laminate is independently selected from one or more of epoxy resin, phenolic resin, phenolic resin, polymethyl methacrylate, and polyvinyl acetal.
5. The method for preparing the magnetostrictive composite material according to any one of claims 1 to 4, characterized in that, When preparing the alloy strip, the copper roller satisfies at least one of the following characteristics: (1) The rotation speed is 50 r / min to 600 r / min; (2) The interior is filled with water or liquid nitrogen.
6. The method for preparing the magnetostrictive composite material according to any one of claims 1 to 4, characterized in that, In the (Tb) x Dy 1-x )Fe y M z In the alloy, the volume percentage of the magnetic phase (Tb,Dy)Fe2 is ≥90%.
7. The method for preparing the magnetostrictive composite material according to any one of claims 1 to 4, characterized in that, The (Tb) x Dy 1-x )Fe y M z The specific process parameters for alloy melting are as follows: The vacuum level of the belt spinning furnace should be ≤2.5×10⁻⁶. -3 Pa, the protective gas is introduced to regulate the pressure to 0.015 MPa~0.030 MPa.
8. The method for preparing the magnetostrictive composite material according to any one of claims 1 to 4, characterized in that, The (Tb) x Dy 1-x )Fe y M z The alloy is produced using a suspension melting process.
9. The method for preparing the magnetostrictive composite material according to claim 8, characterized in that, The specific parameters of the suspension melting process are as follows: the vacuum degree of the suspension melting furnace is controlled to be ≤2.5×10. -3 Pa, the protective gas is introduced to regulate the pressure to 0.015 MPa~0.030 MPa.
10. A magnetostrictive composite material, characterized in that, It is prepared by the method for preparing magnetostrictive composite material as described in any one of claims 1 to 9.
11. A magnetic induction device, characterized in that, Including the magnetostrictive composite material as described in claim 10.
12. The magnetic induction device according to claim 11, characterized in that, The magnetic sensing device includes a transducer, actuator, or sensor.