High-elasticity neodymium-iron-boron composite material and preparation method thereof

Abstract

The application relates to the field of neodymium-iron-boron magnetic materials, and particularly discloses a high-elasticity neodymium-iron-boron composite material and a preparation method thereof. The preparation method of the high-elasticity neodymium-iron-boron composite material comprises the following steps: spraying a first elastic material onto neodymium-iron-boron magnetic material powder being stirred, air-drying, and obtaining surface-treated neodymium-iron-boron magnetic material powder; spraying a second elastic material onto the surface-treated neodymium-iron-boron magnetic material powder being stirred, air-drying, and obtaining neodymium-iron-boron magnetic material premix; mixing, granulating and injection molding the neodymium-iron-boron magnetic material premix, and the temperature is 250-300 DEG C; the elastic modulus of the first elastic material is 50-80 GPa, the elastic modulus of the second elastic material is 1-20 GPa, the melting point of the first elastic material is greater than 300 DEG C, and the melting point of the second elastic material is 250-300 DEG C. The high-elasticity neodymium-iron-boron composite material prepared by the preparation method has the advantages of small elastic modulus, good impact resistance and difficulty in breaking.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of neodymium iron boron magnetic material, more particularly, it relates to a high elasticity neodymium iron boron composite material and a preparation method thereof. BACKGROUND

[0002] Neodymium magnet is also called neodymium iron boron magnet, which is a tetragonal crystal formed by neodymium, iron and boron. Neodymium iron boron permanent magnet is a permanent magnet based on intermetallic compound Nd2Fe 14 B. The main components are rare earth element neodymium (Nd), iron (Fe) and boron (B). Among them, the rare earth element is mainly neodymium (Nd), and other rare earth metals such as dysprosium (Dy) and praseodymium (Pr) can be used to replace it in order to obtain different properties. Iron can also be partially replaced by other metals such as cobalt (Co) and aluminum (Al), and the content of boron is small, but it plays an important role in forming intermetallic compounds with tetragonal crystal structure, which makes the compound have high saturation magnetization, high uniaxial anisotropy and high Curie temperature.

[0003] In the related art, the third generation of rare earth permanent magnet neodymium iron boron is the strongest permanent magnet in contemporary magnets, and its main raw materials include rare earth metal neodymium 29%-32.5%, metal element iron 63.95-68.65%, non-metallic element boron 1.1-1.2%, added dysprosium 0.6-8%, niobium 0.3-0.5%, aluminum 0.3-0.5%, copper 0.05-0.15% and other elements; the production process includes: batching, smelting ingot / strip casting, powder making, molding, sintering tempering, magnetic detection, grinding processing, pin cutting processing, electroplating and finished product. Among them, batching is the basis, and sintering tempering is the key. Although the above-mentioned traditional rare earth permanent magnet neodymium iron boron has strong magnetism, it is very fragile, which becomes a defect that hinders the rare earth permanent magnet neodymium iron boron to broaden the application field. SUMMARY

[0004] In order to provide a rare earth permanent magnet neodymium iron that has good elasticity and is not easy to break while maintaining strong magnetism, the present application provides a high elasticity neodymium iron boron composite material and a preparation method thereof.

[0005] In the first aspect, the present application provides a preparation method of a high elasticity neodymium iron boron composite material, which adopts the following technical scheme:

[0006] A preparation method of a high elasticity neodymium iron boron composite material, comprising the following steps:

[0007] Step 1, uniformly stir the neodymium iron boron magnetic material powder;

[0008] Step 2, spray the first elastic material onto the neodymium iron boron magnetic material powder being stirred, and then air dry to obtain the surface-treated neodymium iron boron magnetic material powder;

[0009] Step 3, continue to stir the surface-treated Nd-Fe-B magnetic material powder at a constant speed, spray the second elastic material onto the stirring surface-treated Nd-Fe-B magnetic material powder, and then air dry to obtain a Nd-Fe-B magnetic material premix;

[0010] Step 4, mix and granulate the Nd-Fe-B magnetic material premix at a temperature of 250-300℃, and then injection mold the granulated material into a high-elasticity Nd-Fe-B composite material of a desired shape;

[0011] The first elastic material has an elastic modulus of 50-80GPa, and the second elastic material has an elastic modulus of 1-20GPa. The first elastic material has a melting point greater than 300℃, and the second elastic material has a melting point of 250-300℃.

[0012] By using the above technical solution, since the Nd-Fe-B magnetic material is brittle and easy to break, and has an elastic modulus in the range of 100-180GPa, and since the first elastic material has an elastic modulus in the range of 50-80GPa and the second elastic material has an elastic modulus in the range of 1-20GPa, the first elastic material is coated on the surface of the Nd-Fe-B magnetic material, and the second elastic material is coated on the surface of the first elastic material. The first elastic material is used to transition the Nd-Fe-B magnetic material and the second elastic material, so that the first elastic material with a larger elastic modulus can be closely connected with the Nd-Fe-B magnetic material, and the first elastic material and the second elastic material can reduce the elastic modulus of the Nd-Fe-B magnetic material and reduce the brittleness of the Nd-Fe-B, thereby reducing the breakage rate of the Nd-Fe-B when colliding.

[0013] Since the first elastic material has a melting point greater than 300℃, the second elastic material has a melting point of 250-300℃, and the granulation temperature in step 4 is also 250-300℃, in step 4, the first elastic material will not melt, and the second elastic material will not completely melt, but will be in a molten state, so that the Nd-Fe-B magnetic material is formed at the same time, and each particle of the Nd-Fe-B magnetic material is coated with the first elastic material and the second elastic material in turn. The high-elasticity Nd-Fe-B composite material finally obtained not only has a strong magnetism, but also has a small elastic modulus.

[0014] Optionally, the step 1 further includes the following pretreatment method: etching the Nd-Fe-B magnetic material powder with an acid solution.

[0015] Optionally, the acid solution is 3-6% HNO3, 1-2% HCL, 3-5% H2SO4, 2-3% H3PO4, or 65-75g / L C2H2O4.

[0016] By adopting the technical scheme, the acid solution with a proper concentration can etch the surface of the neodymium-iron-boron magnetic material particle with a smooth surface into a disordered groove, so that the first elastic material is more stably connected with the neodymium-iron-boron magnetic material, thereby ensuring that the first elastic material is more stably connected with the neodymium-iron-boron magnetic material, and finally, the high-elasticity neodymium-iron-boron composite material prepared has a relatively strong magnetism and a relatively small elastic modulus.

[0017] Optionally, the first elastic material is metal aluminum.

[0018] By adopting the technical scheme, since the elastic modulus of the metal aluminum is in the range of 50-70 GPa, and the melting temperature is 500-600℃, the metal aluminum meets the requirement of the first elastic material of the application, and is relatively low in price and economic and practical.

[0019] Optionally, the second elastic material is polyimide.

[0020] By adopting the technical scheme, since the elastic modulus of the polyimide is in the range of 3-4 GPa, and the melting temperature is 250-300℃, the polyimide meets the requirement of the second elastic material of the application, and is relatively low in price and economic and practical.

[0021] Optionally, the neodymium-iron-boron magnetic material is prepared from 60-70 parts of iron, 0.8-1 part of boron, 15-25 parts of praseodymium-neodymium, 9-15 parts of cerium, 0.1-0.4 parts of cobalt, 0.05-0.1 parts of aluminum, 0.05-0.2 parts of titanium, 0.05-0.2 parts of niobium, and 0.1-0.3 parts of copper, wherein the parts are all weight parts.

[0022] By adopting the technical scheme, the neodymium-iron-boron magnetic material prepared from the iron, boron, praseodymium-neodymium, cerium, cobalt, aluminum, titanium, niobium and copper has a relatively strong magnetism.

[0023] Optionally, in the step 2, the first elastic material is sprayed onto the neodymium-iron-boron magnetic material powder being stirred, the stirring speed is 30-50 rpm, and then the neodymium-iron-boron magnetic material powder is air-dried for 20-40 h to obtain the surface-treated neodymium-iron-boron magnetic material powder.

[0024] By adopting the technical scheme, under the spraying and air-drying conditions, the first elastic material is uniformly coated on the surface of the neodymium-iron-boron magnetic material, the solvent of the first elastic material is completely volatilized, and the first elastic material is firmly adhered to the surface of the neodymium-iron-boron magnetic material, so that the second elastic material can also be firmly adhered to the surface of the neodymium-iron-boron magnetic material to form the high-elasticity neodymium-iron-boron composite material with a small elastic modulus and easy to resist fracture.

[0025] Optionally, the step 3 continues to uniformly stir the surface-treated Nd-Fe-B magnetic material powder at a speed of 30-50 rpm, and the second elastic material is sprayed onto the stirring surface-treated Nd-Fe-B magnetic material powder, and then air-dried for 20-40 h to obtain the Nd-Fe-B magnetic material premix.

[0026] By using the above technical solution, under the above spraying and air-drying conditions, the second elastic material can be uniformly coated on the surface of the first elastic material, the solvent of the second elastic material is completely volatilized, the second elastic material is firmly adhered to the surface of the first elastic material, and a high-elasticity Nd-Fe-B composite material with small elastic modulus and easy to resist fracture is formed.

[0027] Optionally, the step 4 mixes and granulates the Nd-Fe-B magnetic material premix, the temperature of each section of the extruder is 250-255℃, 250-255℃, 255-260℃, 255-260℃, 260-265℃, and 260-265℃, and the rotation speed is 50-70 rpm, and the granulated pellets are injection molded into a high-elasticity Nd-Fe-B composite material with a desired shape.

[0028] By using the above technical solution, the mixing and granulation conditions of the Nd-Fe-B magnetic material premix make the second elastic material in an initial molten state, while maintaining the first elastic material and the second elastic material adhered to the surface of the Nd-Fe-B magnetic material in sequence, the Nd-Fe-B magnetic material premix is tightly bonded, and finally a high-elasticity Nd-Fe-B composite material with good fracture resistance is formed.

[0029] In a second aspect, the application provides a high-elasticity Nd-Fe-B composite material, which adopts the following technical solution:

[0030] A high-elasticity Nd-Fe-B composite material is prepared by the above method for preparing a high-elasticity Nd-Fe-B composite material.

[0031] By using the above technical solution, the high-elasticity Nd-Fe-B composite material prepared by the method for preparing a high-elasticity Nd-Fe-B composite material of the application has high magnetic properties and low elastic modulus.

[0032] In summary, the application has the following beneficial effects:

[0033] 1. In this application, the first elastic material and the second elastic material can reduce the elastic modulus of the NdFeB magnet, reduce the brittleness of the NdFeB, and thus reduce the NdFeB impact fracture rate; and the first elastic material is used as a transition between the NdFeB magnet and the second elastic material, so that the first elastic material with a larger elastic modulus can be tightly connected with the NdFeB magnet, and better reduce the elastic modulus of the NdFeB magnet; the first elastic material will not melt, and the second elastic material will not completely melt, but will be in a molten state, so that when the NdFeB magnet is formed, each particle of the NdFeB magnet is sequentially coated with the first elastic material and the second elastic material, so that the finally obtained high-elasticity NdFeB composite material has a small elastic modulus while maintaining strong magnetism;

[0034] 2. In this application, since hydrochloric acid or phosphoric acid solution can etch disordered grooves on the smooth surface of NdFeB magnet, ensuring a more stable connection between the first elastic material and the NdFeB magnet, the resulting high-elasticity NdFeB composite material has a small elastic modulus while maintaining strong magnetism.

[0035] 3. The neodymium iron boron magnetic material prepared from iron, boron, praseodymium, neodymium, cerium, cobalt, aluminum, titanium, niobium and copper in this application has strong magnetism. Detailed Implementation

[0036] The present application will be further described in detail below with reference to embodiments and comparative examples.

[0037] The raw material sources for the following examples and comparative examples are provided: All raw materials used in the examples and comparative examples are commercially available; Liquid polyimide: Grade PI liquid, purchased from DuPont, USA; Liquid ABS resin: Product number PU-825A05, Brand Zhongen, purchased from Anhui Zhongen Chemical Co., Ltd.; The rubber can be any rubber with an elastic modulus below 1 GPa. The liquid rubber used in the examples and comparative examples, Grade LNBR40, Model N41, purchased from Dongguan Ante Plastic Raw Materials Co., Ltd.; Liquid polyamide, Brand Shuangfeng, purchased from Wuxi Qianguang Chemical Raw Materials Co., Ltd.

[0038] Preparation of neodymium iron boron magnetic powder:

[0039] Raw materials: 67.22kg iron powder, 0.95kg boron powder, 20.20kg praseodymium-neodymium powder, 11kg cerium powder, 0.2kg cobalt powder, 0.08kg aluminum powder, 0.1kg titanium powder, 0.1kg niobium powder, 0.15kg copper powder; The above raw materials are fed into a European-style mill by a bucket elevator for grinding to the required particle size of 50-100μm, then screened by a sieve, and finally collected and bagged by a powder collector.

[0040] An embodiment of a highly elastic neodymium iron boron composite material

[0041] Example 1

[0042] A high-elasticity neodymium-iron-boron composite material and a preparation method thereof, the preparation steps of which are as follows:

[0043] Pre-treatment: soak the neodymium-iron-boron magnetic material powder in 3% hydrochloric acid for 30 min, etch the neodymium-iron-boron magnetic material powder, and then centrifuge the neodymium-iron-boron magnetic material powder at a speed of 100 rpm for 10 min to pre-treat the neodymium-iron-boron magnetic material powder;

[0044] Step 1: uniformly stir the pre-treated neodymium-iron-boron magnetic material powder at a speed of 30 rpm;

[0045] Step 2: spray 5% of liquid aluminum by weight of the neodymium-iron-boron magnetic material powder onto the stirring neodymium-iron-boron magnetic material powder; the spraying air pressure is 0.3 MPa; the spraying speed is 30 cm / s; the stirring speed during spraying is 40 rpm, and then air dry for 24 h to obtain the surface-treated neodymium-iron-boron magnetic material powder;

[0046] Step 3: continue to uniformly stir the surface-treated neodymium-iron-boron magnetic material powder at a speed of 40 rpm, and spray 7% of liquid polyimide by weight of the neodymium-iron-boron magnetic material powder onto the stirring surface-treated neodymium-iron-boron magnetic material powder; the spraying air pressure is 0.3 MPa; the spraying speed is 30 cm / s; the stirring speed during spraying is 40 rpm, and then air dry for 24 h to obtain the neodymium-iron-boron magnetic material premix;

[0047] Step 4: mix and granulate the neodymium-iron-boron magnetic material premix, the temperature of each section of the extruder is 255℃, 255℃, 260℃, 260℃, 265℃, 265℃, the rotating speed is 60 rpm, the injection molding temperature is 265℃, the pressure is 40 MPa, and the granulated material is injection molded into a high-elasticity neodymium-iron-boron composite material of a required shape.

[0048] Example 2

[0049] The difference from Example 1 is that the liquid polyimide in Step 3 is replaced by an equal weight of liquid ABS resin.

[0050] Example 3

[0051] The difference from Example 1 is that the liquid aluminum in Step 2 is replaced by an equal weight of liquid nano calcium carbonate, and the particle size of the nano calcium carbonate is 100-500 nm.

[0052] Comparative Example 1

[0053] The difference from Example 1 is that Step 2 is different, and the air drying step is not performed.

[0054] The specific steps are as follows: step 2, spraying 5% of liquid aluminum in weight of the Nd-Fe-B magnetic material powder to the Nd-Fe-B magnetic material powder being stirred; spraying air pressure, 0.3 MPa; spraying speed, 30 cm / s; the stirring speed during spraying is 40 rpm, to obtain the surface-treated Nd-Fe-B magnetic material powder in a sticky state.

[0055] Comparative Example 2

[0056] The difference from Example 1 is that: step 2 and step 3 are carried out at the same time;

[0057] The specific steps are as follows: step 2, spraying 5% of liquid aluminum in weight of the Nd-Fe-B magnetic material powder and 7% of liquid polyimide in weight of the Nd-Fe-B magnetic material powder to the Nd-Fe-B magnetic material powder being stirred; spraying air pressure, 0.3 MPa; spraying speed, 30 cm / s; the stirring speed during spraying is 40 rpm, and then air-drying for 48 h, to obtain the Nd-Fe-B magnetic material premix.

[0058] Comparative Example 3

[0059] The difference from Example 1 is that: step 2 is not carried out;

[0060] The specific steps are as follows:

[0061] Pre-treatment: soaking the Nd-Fe-B magnetic material powder in 3% hydrochloric acid for 30 min, etching the Nd-Fe-B magnetic material powder, and then centrifuging the Nd-Fe-B magnetic material powder at a speed of 100 rpm for 10 min, to pre-treat the Nd-Fe-B magnetic material powder;

[0062] Step 1, uniformly stirring the pre-treated Nd-Fe-B magnetic material powder at a speed of 30 rpm;

[0063] Step 2, spraying 7% of liquid polyimide in weight of the Nd-Fe-B magnetic material powder to the pre-treated Nd-Fe-B magnetic material powder being stirred; spraying air pressure, 0.3 MPa; spraying speed, 30 cm / s; the stirring speed during spraying is 40 rpm, and then air-drying for 24 h, to obtain the Nd-Fe-B magnetic material premix;

[0064] Step 3, mixing and granulating the Nd-Fe-B magnetic material premix, the temperature of each section of the extruder is 255℃, 255℃, 260℃, 260℃, 265℃, 265℃, the rotating speed is 60 rpm, the injection molding temperature is 265℃, the pressure is 40 MPa, and the granulated pellets are injection molded into the high-elasticity Nd-Fe-B composite material with the required shape.

[0065] Comparative Example 4

[0066] The difference from Example 1 is that: step 3 is not carried out;

[0067] The specific steps are as follows:

[0068] Pre-treatment: The Nd-Fe-B magnetic material powder was soaked in 3% hydrochloric acid for 30 min to etch the powder, and then centrifuged at 100 rpm for 10 min to pre-treat the powder;

[0069] Step 1: The pre-treated Nd-Fe-B magnetic material powder was stirred at 30 rpm;

[0070] Step 2: 5% by weight of the Nd-Fe-B magnetic material powder of liquid aluminum was sprayed onto the stirring Nd-Fe-B magnetic material powder; the spraying air pressure was 0.3 MPa; the spraying speed was 30 cm / s; the stirring speed during spraying was 40 rpm, and then air-dried for 24 h to obtain the surface-treated Nd-Fe-B magnetic material powder;

[0071] Step 3: The surface-treated Nd-Fe-B magnetic material powder was mixed and granulated, the extruder temperature was 255℃, 255℃, 260℃, 260℃, 265℃, 265℃, the rotation speed was 60 rpm, the injection molding temperature was 265℃, the pressure was 40 MPa, and the granulated pellets were injection molded into the desired shape of the high-elasticity Nd-Fe-B composite material.

[0072] Comparative Example 5

[0073] The difference from Example 1 is that Step 4 is different.

[0074] The specific steps are as follows: Step 4, the Nd-Fe-B magnetic material premix is mixed and granulated, the extruder temperature is 330℃, 330℃, 335℃, 335℃, 340℃, 340℃, the rotation speed is 60 rpm, the injection molding temperature is 340℃, the pressure is 40 MPa, and the granulated pellets are injection molded into the desired shape of the high-elasticity Nd-Fe-B composite material.

[0075] Comparative Example 6

[0076] The difference from Example 1 is that the liquid aluminum in Step 2 is replaced by an equal weight of liquid polyamide.

[0077] Comparative Example 7

[0078] The difference from Example 1 is that the liquid polyimide in Step 3 is replaced by an equal weight of liquid rubber.

[0079] Comparative Example 8

[0080] A commercially available Nd-Fe-B rare earth magnetic material was used; model: N40; manufacturer: Ningbo Xihao Magnetic Material Co., Ltd.

[0081] Performance test

[0082] The high-elasticity neodymium-iron-boron composite material prepared in Examples 1 to 3 and Comparative Examples 1 to 8 is subjected to performance testing to detect the residual magnetism induction intensity, the maximum magnetic energy product, the elastic modulus and the impact strength; the detection of the residual magnetism induction intensity and the maximum magnetic energy product is based on GB / T3217 Permanent Magnet (Hard Magnet) Material Magnetic Property Test Method; the detection of the elastic modulus is based on GB / T22315-2008 Metal Material Elastic Modulus and Poisson's Ratio Test Method; the detection of the impact strength is based on GB / T3808-2002 Pendulum Impact Tester; and the test results are shown in Table 1 below.

[0083] Table 1

[0084]

[0085] In combination with Examples 1, 2 and 3, it can be seen that when the elastic modulus of the first elastic material is in the range of 50-80 GPa and the melting temperature is greater than 300℃, the elastic modulus of the second elastic material is between 1-20 GPa and the melting temperature is between 250-300℃, the high-elasticity neodymium-iron-boron composite material prepared has a reduced elastic modulus and an increased impact strength while maintaining a high magnetism, and thus the breakage rate during collision is reduced.

[0086] In combination with Examples 1 and Comparative Examples 1 and 2, it can be seen that the step 2 of Comparative Example 1 is not air-dried, and the step 1 and step 2 of Comparative Example 2 are mixed, which causes the first elastic material and the second elastic material to not be distributed layer by layer on the surface of the neodymium-iron-boron magnetic material but to be mixed and adhered; thus, the high-elasticity neodymium-iron-boron composite material prepared in Comparative Example 1 and Comparative Example 2 has a less reduced elastic modulus and a less increased impact strength while maintaining a high magnetism, and thus the breakage rate during collision is higher than that of the Examples.

[0087] In combination with Examples 1 and Comparative Examples 3 and 4, it can be seen that Comparative Example 3 does not have the step 2, and Comparative Example 4 does not have the step 3, and thus the high-elasticity neodymium-iron-boron composite material prepared in Comparative Example 3 and Comparative Example 4 is not in the layer-by-layer gradual coating manner of the present application, and the high-elasticity neodymium-iron-boron composite material prepared in Comparative Example 3 and Comparative Example 4 has a less reduced elastic modulus and a less increased impact strength while maintaining a high magnetism, and thus the breakage rate during collision is higher than that of the Examples.

[0088] In combination with Examples 1 and Comparative Example 5, it can be seen that the temperature of the mixed granulation is increased in Comparative Example 5, which causes the second elastic material on the surface of the neodymium-iron-boron magnetic material to be completely melted, and thus the uniformity of the second elastic material coated on each neodymium-iron-boron powder particle is reduced, and the high-elasticity neodymium-iron-boron composite material prepared has a less reduced elastic modulus and a less increased impact strength, and thus the breakage rate during collision is higher than that of the Examples.

[0089] In combination with Example 1 and Comparative Examples 6 and 7, it can be seen that the first elastic material in Comparative Example 6 uses polyamide, and the elastic modulus is not within the scope of protection of the present application; the second elastic material in Comparative Example 7 uses rubber, and the elastic modulus is not within the scope of protection of the present application, so the elastic modulus of the high-elasticity neodymium-iron-boron composite material prepared in Comparative Examples 6 and 7 is reduced by a small amount, the impact resistance is increased by a small amount, and the breakage rate during collision is higher than that of Example 1.

[0090] In combination with Example 1 and Comparative Example 8, it can be seen that Comparative Example 8 is a commercially available neodymium-iron-boron rare earth magnet, and the elastic modulus of the high-elasticity neodymium-iron-boron composite material prepared in Example 1 is 1 / 2 of the commercially available neodymium-iron-boron rare earth magnet of Comparative Example 8, and the impact resistance is increased by a larger amount, indicating that the high-elasticity neodymium-iron-boron composite material prepared in the present application has high elasticity and is not prone to breakage.

[0091] The specific embodiments are merely illustrative of the present application, and are not a limitation of the present application. Those skilled in the art can make modifications to the embodiments without creative contribution after reading the present specification, and the modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A method of producing a high-elasticity neodymium-iron-boron composite material, characterized by, The method comprises the following steps: Step 1, uniformly stirring the Nd-Fe-B magnetic material powder; Step 2, spraying the first elastic material onto the stirring Nd-Fe-B magnetic material powder, and then air-drying to obtain the surface-treated Nd-Fe-B magnetic material powder; Step 3, continuously uniformly stirring the surface-treated Nd-Fe-B magnetic material powder, spraying the second elastic material onto the stirring surface-treated Nd-Fe-B magnetic material powder, and then air-drying to obtain the Nd-Fe-B magnetic material premix; Step 4, mixing and granulating the Nd-Fe-B magnetic material premix at a temperature of 250-300℃, and then injection-molding the granulated material into the high-elasticity Nd-Fe-B composite material with a required shape; The first elastic material has an elastic modulus of 50-80GPa, and the second elastic material has an elastic modulus of 1-20GPa; the first elastic material has a melting point greater than 300℃, and the second elastic material has a melting point of 250-300℃; The first elastic material is aluminum; The second elastic material is polyimide; In the step 4, the temperature of each section of the extruder is 250-255℃, 250-255℃, 255-260℃, 255-260℃, 260-265℃, and 260-265℃, and the rotating speed is 50-70rpm.

2. The method for preparing a highly elastic NdFeB composite material according to claim 1, characterized in that, Before the step 1, the Nd-Fe-B magnetic material powder is etched by using an acid solution.

3. The method for preparing a highly elastic NdFeB composite material according to claim 1, characterized in that, The Nd-Fe-B magnetic material is prepared from 60-70 parts of iron, 0.8-1 part of boron, 15-25 parts of praseodymium and neodymium, 9-15 parts of cerium, 0.1-0.4 parts of cobalt, 0.05-0.1 parts of aluminum, 0.05-0.2 parts of titanium, 0.05-0.2 parts of niobium, and 0.1-0.3 parts of copper.

4. The method for preparing a highly elastic NdFeB composite material according to claim 1, characterized in that, In the step 2, the first elastic material is sprayed onto the stirring Nd-Fe-B magnetic material powder at a stirring speed of 30-50rpm, and then air-dried for 20-40h to obtain the surface-treated Nd-Fe-B magnetic material powder.

5. The method for preparing a highly elastic NdFeB composite material according to claim 1, characterized in that, In the step 3, the surface-treated Nd-Fe-B magnetic material powder is continuously stirred at a speed of 30-50rpm, the second elastic material is sprayed onto the stirring surface-treated Nd-Fe-B magnetic material powder, and then air-dried for 20-40h to obtain the Nd-Fe-B magnetic material premix.

6. A high flexibility neodymium-iron-boron composite material, characterized by The high-elasticity Nd-Fe-B composite material is prepared by the method of any one of claims 1-5.

Images