CN102360653A - Flexible rare earth bonded magnet with roll anisotropy and manufacturing method thereof - Google Patents
Flexible rare earth bonded magnet with roll anisotropy and manufacturing method thereof Download PDFInfo
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Abstract
The invention discloses a flexible rare earth bonded magnet with roll anisotropy and a manufacturing method thereof. The magnet comprises the following components in part by mass: 94 to 97 parts of anisotropic rare earth composite permanent magnet powder, 2.8 to 5.5 parts of binder and 0.2 to 0.5 part of processing aid, wherein the anisotropic rare earth composite permanent magnet powder comprises anisotropic ferrite permanent magnet powder, anisotropic samarium-iron-nitrogen permanent magnet powder, anisotropic neodymium-iron-nitrogen permanent magnet powder and neodymium-iron-boron permanent magnet powder with roll anisotropy. The anisotropic rare earth composite permanent magnet powder is subjected to surface treatment by using a surface treatment agent. A permanent magnet product with the thickness of 0.35 to 8mm and the maximum width of 1,000mm can be manufactured by processing the components by a calendering method; the disadvantages of various conventional permanent magnet materials are overcome; and a magnetic material which has a thin wall, large length-diameter ratio, high flexibility and higher magnetic performance can be manufactured under the condition that an oriented magnetic field is not required to be applied.
Description
Technical Field
The invention relates to the field of magnetic materials, in particular to a rolling anisotropic flexible rare earth bonded magnet and a manufacturing method thereof.
Background
The permanent magnetic material is an important branch of electronic materials, and the performance of the permanent magnetic material directly reflects the development level of the electronic materials in a country. With the wide application of high-performance permanent magnetic materials in the industries of computers, automobiles, aerospace, office equipment, household appliances, medical treatment and the like, the market demand of the high-performance permanent magnetic materials is gradually increased year by year.
At present, most of high-performance permanent magnet materials in the market are rare earth bonded magnets; the rare earth bonded magnet is a magnet prepared by mixing rare earth permanent magnet powder with a certain proportion of a binder and processing the mixture according to a certain processing technology, and the final form of the rare earth bonded magnet can be divided into a rigid rare earth bonded magnet and a flexible rare earth bonded magnet. The magnetic energy product of the existing rigid rare earth bonded magnet is 64-160 kJ/m3Since the bonded permanent magnetic material is rigid, the thickness and flexibility of the product are limited, so that a thin-wall magnetic device with a large length-diameter ratio cannot be manufactured, and the requirements of electronic equipment on light weight, portability and high reliability are difficult to meet. The existing flexible rare earth bonded magnet comprises a flexible bonded ferrite magnet and an isotropic flexible rare earth bonded magnet, wherein the maximum energy product of the flexible bonded ferrite magnet is only 14kJ/m3About, the maximum energy product of isotropic flexible rare earth bonded magnet is also 50kJ/m3Below, they are far from meeting the performance requirements of electronic devices; if the performance of the magnet is improved by increasing the filling amount of the magnetic powder, the magnet gradually loses flexibility, and the magnet cannot be molded seriously, so that the requirement of practical use cannot be met.
The rare earth bonded magnet is mostly processed by adopting the production process of injection molding or extrusion molding at present; injection molding is a complete set of production process in which magnetic powder and a binder (for example, the binder is commonly used in the field such as nylon 6, polyamide and polyester) are uniformly mixed, dried granules are prepared through a mixing and granulating part, then the granules are conveyed to a heating chamber by a spiral material guide rod to be heated, and finally the granules are injected into a mold to be molded and cooled; the extrusion process is substantially the same as injection molding, and the only difference is that the heated pellets are extruded into a mold through a hole. However, the two production processes both require a high-energy orientation magnetic field to be applied during the molding process to achieve a good orientation effect of the produced rare earth bonded magnet and to achieve a high magnetic property of the produced rare earth bonded magnet, which makes the production process of the rare earth bonded magnet complicated.
Therefore, it is urgent to manufacture a magnetic material having a thin wall, a large aspect ratio, good flexibility and high magnetic performance without applying a high-energy orientation magnetic field.
Disclosure of Invention
The embodiment of the invention provides a rolling anisotropic flexible rare earth bonded magnet and a manufacturing method thereof, so that a magnetic material with thin wall, large length-diameter ratio, good flexibility and higher magnetic performance can be manufactured under the condition of not applying a high-energy orientation magnetic field.
The purpose of the invention is realized by the following technical scheme:
a calendered anisotropic flexible rare earth bonded magnet comprising the components: anisotropic rare earth composite permanent magnetic powder, a binder and a processing aid; the weight ratio of each component to the total weight is as follows:
94-97 parts of anisotropic rare earth composite permanent magnetic powder;
2.8 to 5.5 portions of adhesive;
0.2-0.5 parts of processing aid;
the anisotropic rare earth composite permanent magnet powder is subjected to surface treatment by a surface treatment agent.
Preferably, the respective anisotropic rare earth composite permanent magnetic powder comprises the following components:
anisotropic ferrite permanent magnet powder, anisotropic samarium iron nitrogen permanent magnet powder, anisotropic neodymium iron nitrogen permanent magnet powder and neodymium iron nitrogen permanent magnet powder with rolling anisotropy;
the mass ratio of each component before surface treatment to the total amount of the anisotropic rare earth composite permanent magnetic powder is as follows:
the neodymium iron boron permanent magnet powder with rolling anisotropy comprises: 89-96 parts;
the anisotropic ferrite permanent magnetic powder comprises: 2-5 parts;
anisotropic samarium iron nitrogen permanent magnet powder comprises: 1-3 parts;
anisotropic neodymium iron nitrogen permanent magnetic powder comprises: 1 to 3 portions.
Preferably, the respective components of the surface treatment agent comprise: silane coupling agent, epoxy resin and Mannich modified amine resin normal temperature curing agent; wherein:
the mass of the silane coupling agent is 0.5-1% of the total mass of the anisotropic rare earth composite permanent magnetic powder before surface treatment,
the mass of the epoxy resin is 1-2% of the total mass of the anisotropic rare earth composite permanent magnetic powder before surface treatment,
the mass of the Mannich modified amine resin normal temperature curing agent is 50-80% of that of the epoxy resin.
Preferably, the corresponding binder is at least one of chlorinated polyethylene, nitrile rubber, acetic acid-vinyl acetate copolymer, chlorosulfonated polyethylene, and thermoplastic elastomer.
Preferably, the corresponding processing aids are a lubricant and a plasticizer in a mass ratio of 1: 1.
A manufacturing method of a rolled anisotropic flexible rare earth bonded magnet is used for manufacturing the rolled anisotropic flexible rare earth bonded magnet in the technical scheme, and comprises the following steps:
A. carrying out surface treatment on the anisotropic rare earth composite permanent magnetic powder by using a surface treating agent;
B. mixing the anisotropic rare earth composite permanent magnetic powder, the binder and the processing aid according to a preset proportion;
C. crushing the mixed product and enabling the crushed product to pass through a standard sieve with 12 meshes;
D. carrying out one-pass calendering molding on the undersize product on a calender to form a magnetic sheet;
E. and overlapping the magnetic sheets and rolling again to obtain the rolling anisotropic flexible rare earth bonded magnet.
According to the technical scheme provided by the invention, the rolled anisotropic flexible rare earth bonded magnet provided by the embodiment of the invention is formed by mutually rolling and bonding 94-97 parts of anisotropic rare earth composite permanent magnet powder, 2.8-5.5 parts of bonding agent and 0.2-0.5 part of processing aid; the anisotropic rare earth composite permanent magnet powder in the embodiment of the invention takes the neodymium iron boron permanent magnet powder with rolling anisotropy as a main necessary component and is supplemented with the anisotropic ferrite permanent magnet powder, and the mixed powder of the neodymium iron boron permanent magnet powder with rolling anisotropy and the anisotropic ferrite permanent magnet powder is rolled and oriented in the rolling process, so that the magnetic material with thin wall, large length-diameter ratio, good flexibility and higher magnetic performance can be prepared under the condition of not applying a high-energy orientation magnetic field.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic flow chart illustrating a method for manufacturing a magnet according to an embodiment of the present invention;
FIG. 2 is a first schematic view of a method for manufacturing a magnet according to an embodiment of the present invention;
fig. 3 is a schematic diagram illustrating a manufacturing method of a magnet according to an embodiment of the present invention.
Detailed Description
In the following, the technical solutions in the embodiments of the present invention are clearly and completely described with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
The following first describes a detailed description of a rolled anisotropic flexible rare earth bonded magnet provided by an embodiment of the present invention.
The calendering anisotropic flexible rare earth bonded magnet provided by the embodiment of the invention is a calendering anisotropic flexible rare earth bonded magnet, and the calendering anisotropic flexible rare earth bonded magnet comprises the following components: anisotropic rare earth composite permanent magnetic powder, a binder and a processing aid; the weight ratio of each component to the total weight is as follows:
94-97 parts of anisotropic rare earth composite permanent magnetic powder;
2.8 to 5.5 portions of adhesive;
0.2-0.5 parts of processing aid;
the anisotropic rare earth composite permanent magnet powder is subjected to surface treatment by a surface treatment agent.
Specifically, specific embodiments of the components of the calendered anisotropic flexible rare earth bonded magnet are as follows:
(1) the corresponding anisotropic rare earth composite permanent magnetic powder comprises the following components: anisotropic ferrite permanent magnet powder, anisotropic samarium iron nitrogen permanent magnet powder, anisotropic neodymium iron nitrogen permanent magnet powder and neodymium iron nitrogen permanent magnet powder with rolling anisotropy;
the mass ratio of each component before surface treatment to the total amount of the anisotropic rare earth composite permanent magnetic powder is as follows:
the neodymium iron boron permanent magnet powder with rolling anisotropy comprises: 89-96 parts;
the anisotropic ferrite permanent magnetic powder comprises: 2-5 parts;
anisotropic samarium iron nitrogen permanent magnet powder comprises: 1-3 parts;
anisotropic neodymium iron nitrogen permanent magnetic powder comprises: 1-3 parts;
that is, the anisotropic ferrite permanent magnet powder, the anisotropic samarium-iron-nitrogen permanent magnet powder, and the anisotropic neodymium-iron-nitrogen permanent magnet powder together account for: 4 to 11 portions.
The anisotropic ferrite permanent magnet powder, the anisotropic samarium iron nitrogen permanent magnet powder and the anisotropic neodymium iron nitrogen permanent magnet powder adopted in the embodiment of the invention respectively refer to ferrite permanent magnet powder, samarium iron nitrogen permanent magnet powder and neodymium iron nitrogen permanent magnet powder which have anisotropy and can be obtained by commercial means in the prior art. The neodymium iron boron permanent magnet powder with rolling anisotropy adopted by the embodiment of the invention is a neodymium iron boron permanent magnet powder with a particle shape similar to a sheet shape, can also be obtained by means of commercial sale, and has rolling anisotropy; when the sheet-shaped anisotropic permanent magnetic powder is subjected to rolling forming, the normal direction of the sheet-shaped anisotropic permanent magnetic powder is parallel to the thickness direction of the sheet material due to the action of the constant-speed roller, so that the sheet-shaped anisotropic permanent magnetic powder generates certain stress orientation, the easy magnetization axis of the permanent magnetic powder is parallel to the thickness direction of the sheet material, and finally, the magnetic performance of the sheet material in the thickness direction is far higher than that of the sheet material in other directions. Due to the adoption of the neodymium iron boron permanent magnet powder with rolling anisotropy, the rolling anisotropy flexible rare earth bonded magnet provided by the embodiment of the invention does not need to apply a high-energy directional magnetic field in the production process, and has better flexibility and better magnetic performance compared with the rare earth bonded magnet manufactured by the existing generation process; meanwhile, the neodymium iron boron permanent magnet powder which generates anisotropy in the rolling process also has the advantages of thin wall, large length-diameter ratio and the like of the manufactured magnet far superior to those of the rare earth bonded magnet manufactured by the existing production process.
(2) In order to improve the compatibility between the permanent magnetic powder and the binder and improve the magnetic performance of the manufactured magnet, the anisotropic rare earth composite permanent magnetic powder adopted by the invention needs to be subjected to surface treatment by a surface treatment agent, and an organic protective layer is formed on the surface of the magnetic powder. The components of the corresponding surface treating agent comprise a silane coupling agent, epoxy resin and a Mannich modified amine resin normal-temperature curing agent in the prior art; the mass of the silane coupling agent is 0.5-1% of the total mass of the anisotropic rare earth composite permanent magnet powder before surface treatment, the mass of the epoxy resin is 1-2% of the total mass of the anisotropic rare earth composite permanent magnet powder before surface treatment, the mass of the Mannich modified amine resin normal temperature curing agent is 50-80% of the mass of the epoxy resin, and the total mass of the anisotropic rare earth composite permanent magnet powder after surface treatment accounts for 94-97 parts of the total mass of the rolled anisotropic flexible rare earth bonded magnet to be prepared. When the surface treating agent is used for treating the anisotropic rare earth composite permanent magnetic powder, the silane coupling agent and the epoxy resin are coated on the surface of the magnetic powder, and the Mannich modified amine resin normal-temperature curing agent can be used for curing the silane coupling agent and the epoxy resin layer coated on the surface of the magnetic powder at normal temperature, so that an organic protective layer with certain strength is formed on the surface of the magnetic powder particles. The organic protective layer can enhance the bonding strength between the magnetic powder and the binder, and can further solidify the magnetic powder and the binder under the action of the temperature of the roller in the process of further processing the magnetic powder, thereby effectively preventing the magnetic performance loss caused by the influence of the rolling temperature on the magnetic powder in the processing process.
(3) The binder adopted by the invention can be one or more of chlorinated polyethylene, nitrile rubber, acetic acid-vinyl acetate copolymer, chlorosulfonated polyethylene and thermoplastic elastomer which are commonly used by people in the field; the corresponding thermoplastic elastomer is a kind of elastomer having rubber elasticity at normal temperature and plastic molding at high temperature, and the current main categories include: styrene-based thermoplastic elastomers, olefin-based thermoplastic elastomers, diene-based thermoplastic elastomers, vinyl chloride-based thermoplastic elastomers, polyurethane-based thermoplastic elastomers, and the like.
(4) The processing aid adopted by the invention can be a lubricant and a plasticizer which are commonly used by people in the field, and the mass ratio of the lubricant to the plasticizer is preferably 1: 1; for example: the corresponding lubricant can be lubricating oil, silicone oil, fatty acid amide, oleic acid, polyester, synthetic ester, carboxylic acid and the like in the prior art; the corresponding plasticizers can be phthalates, phosphates, benzoates, alkylsulfonates, etc., as known in the art.
The following describes a method for manufacturing a rolled anisotropic flexible rare earth bonded magnet according to an embodiment of the present invention in detail.
As shown in fig. 1, the method for manufacturing a rolled anisotropic flexible rare earth bonded magnet according to the embodiment of the present invention may be used for manufacturing the rolled anisotropic flexible rare earth bonded magnet described in the above technical solution, and includes the following specific steps:
A. carrying out surface treatment on the anisotropic rare earth composite permanent magnetic powder by using a surface treating agent;
specifically, the total mass of the anisotropic rare earth composite permanent magnet powder after surface treatment (namely, a value between 94 parts and 97 parts of the total mass of the rolled anisotropic flexible rare earth bonded magnet) is determined according to the total mass of the rolled anisotropic flexible rare earth bonded magnet to be prepared; secondly, determining the total mass of the anisotropic rare earth composite permanent magnetic powder before surface treatment and the using amount of each surface treatment agent according to the total mass of the anisotropic rare earth composite permanent magnetic powder after surface treatment and the proportioning scheme of the surface treatment agent to be adopted (for example, any scheme in the table 3 can be adopted); secondly, determining the mass of the required anisotropic ferrite permanent magnet powder, anisotropic samarium iron nitrogen permanent magnet powder, anisotropic neodymium iron nitrogen permanent magnet powder and calendered anisotropic neodymium iron nitrogen permanent magnet powder according to the total mass of the anisotropic rare earth composite permanent magnet powder before surface treatment and the component proportion scheme of the anisotropic rare earth composite permanent magnet powder (for example, any scheme in the table 2 can be adopted); then, sequentially weighing anisotropic ferrite permanent magnet powder, anisotropic samarium iron nitrogen permanent magnet powder, anisotropic neodymium iron nitrogen permanent magnet powder, neodymium iron nitrogen permanent magnet powder with calendering anisotropy, silane coupling agent, epoxy resin and Mannich modified amine resin normal-temperature curing agent according to the calculation result; finally, diluting the silane coupling agent, the epoxy resin and the Mannich modified amine resin normal temperature curing agent with water, and pouring the diluted silane coupling agent, the epoxy resin and the Mannich modified amine resin normal temperature curing agent, the anisotropic ferrite permanent magnet powder, the anisotropic samarium iron nitrogen permanent magnet powder, the anisotropic neodymium iron nitrogen permanent magnet powder and the neodymium iron boron permanent magnet powder with calendering anisotropy into a stirrer to be uniformly stirred, so that an organic protective layer is formed on the surface of the anisotropic rare earth composite permanent magnet powder; the specific processing equipment and processing parameters involved in this step of operation can be implemented using the technical solutions conventionally used by those skilled in the art.
B. Mixing the anisotropic rare earth composite permanent magnetic powder, the binder and the processing aid according to a preset proportion;
specifically, determining the mass of the required adhesive and the processing aid according to the total mass of the anisotropic rare earth composite permanent magnetic powder subjected to surface treatment calculated in the step A and weighing the mass; the weighed binder and processing aid are put into a mixing device (for example, the corresponding mixing device can be conventional equipment in the field such as an open mill, an internal mixer and a screw continuous mixer in the prior art, but the internal mixer is preferably selected) together with the anisotropic rare earth composite permanent magnet powder after surface treatment, and are mixed, so that the binder and the processing aid are uniformly dispersed into the permanent magnet powder. The specific processing equipment and processing technological parameters involved in the operation of the step can be implemented by adopting the technical scheme conventionally used by a person with ordinary skill in the art in the prior art, but the processing temperature of the mixing device is preferably kept at 90-110 ℃.
Further, the mixing process shown in fig. 2 is taken as an example to describe the present step in more detail; reference numeral 21 denotes a mixed powder composed of a binder, a processing aid and anisotropic rare earth composite permanent magnet powder; reference numeral 22 denotes a set of opposed differential rolls of a kneading apparatus of the prior art. When the mixed powder 21 composed of the binder, the processing aid and the anisotropic rare earth composite permanent magnet powder passes through the differential rollers, the two rollers in the pair of rolling differential rollers extrude the mixed powder 21 at different rotating speeds, so that the binder and the processing aid are uniformly dispersed in the permanent magnet powder and generate a series of physical changes, and finally, a uniform mixed product 23 is formed.
C. Crushing the mixed product and enabling the crushed product to pass through a standard sieve with 12 meshes;
specifically, the product after mixing is crushed by a crushing device in the prior art, and the obtained granules are screened by a standard sieve of 12 meshes to obtain granules with the granularity smaller than 12 meshes. The crushing device, the 12-mesh standard sieve and the specific crushing process and screening process involved in the operation can be implemented by adopting the technical scheme conventionally used by a person with ordinary skill in the art in the prior art.
D. Carrying out one-pass calendering molding on the undersize product on a calender to form a magnetic sheet;
specifically, calendering molding is a common method for producing a bonded magnet by calendering a pellet into a sheet-like material; the calender is common equipment for finishing the calendering molding process in the prior art; in the method for manufacturing the rolled anisotropic flexible rare earth bonded magnet according to the embodiment of the present invention, it is preferable to use a large-sized calender for rolling. And C, carrying out one-time rolling molding on the undersize product containing the binder, the processing aid and the anisotropic rare earth composite permanent magnet powder treated in the step C through a rolling machine to form the magnetic sheet. Flux sheets are generally thin, also commonly referred to as "thin flux sheets," and their thickness is related to the process parameters of the calender. The specific processing equipment and processing technological parameters involved in the operation of the step can be implemented by adopting the technical scheme conventionally used by a person with ordinary skill in the art in the prior art, but the processing temperature of the calender is preferably kept at 40-50 ℃.
Further, as shown in fig. 3, in one embodiment of the present invention, a constant rolling mill 32 is used for rolling, and the undersize 31 containing the binder, the processing aid, and the anisotropic rare earth composite permanent magnet powder after the step C is rolled on the constant rolling mill 32 in one pass, thereby forming the flux sheet 33.
E. And overlapping the magnetic sheets and rolling again to obtain the rolling anisotropic flexible rare earth bonded magnet.
Specifically, the magnetic sheets are overlapped and rolled again to obtain the rolling anisotropic flexible rare earth bonded magnet with the thickness of 0.35mm to 8mm and the maximum width of 1000 mm. The magnetic energy product of the rolled anisotropic flexible rare earth bonded magnet can reach more than 10MGOe (MGOe is the unit of the magnetic energy product), and the rolled anisotropic flexible rare earth bonded magnet can be made into almost infinite shapes, mechanical, physical and magnetic sections such as sheets, strips, plates and the like through rolling forming, and can even be directly processed into thin-wall structural components with complex shapes, so that the defects of permanent magnet materials in the market can be completely overcome.
Furthermore, for the micro special motor, the rolling anisotropic flexible rare earth bonded magnet provided by the embodiment of the invention can enable the micro special motor to have good static characteristics and dynamic characteristics, simplify the magnetic circuit design of the motor, and enable the motor to have stability without being interfered by an external magnetic field; meanwhile, because the raw materials adopted by the magnet have higher high coercive force and intrinsic coercive force, higher magnetomotive force and air gap magnetic field can be provided, the volume of the motor can be reduced, the output of the motor is increased, the efficiency is improved, and the energy is saved and the consumption is reduced; the method has important practical significance for the development of modularization, combination and mechanical and electrical integration of the micro-special motor.
In addition, the rolling orientation characteristic of the neodymium iron boron permanent magnet powder with rolling anisotropy is utilized by the rolling anisotropic flexible rare earth bonded magnet manufactured by the rolling forming process, so that the bonded rare earth magnet with higher performance is manufactured by adopting lower magnetic powder content. Compared with the compression molding rare earth magnets which are produced in industrial batch and have the same magnetic energy product, the mass percentage of the rare earth magnetic powder is reduced by more than 5 percent, thereby effectively saving the rare earth resources in China.
In order to facilitate understanding of the rolled anisotropic flexible rare earth bonded magnet and the method for manufacturing the same according to the embodiments of the present invention, a detailed description will be given below of the implementation process thereof with reference to the accompanying drawings by way of example.
First, the component contents of several sets of the rolled anisotropic flexible rare earth bonded magnets described in this document are provided, and as shown in table 1, the parts shown in this table refer to the mass ratio of each component to the total amount of the rolled anisotropic flexible rare earth bonded magnets.
Table 1:
| examples | Anisotropic rare earth composite permanent magnetic powder | Binder | Processing aid |
| Example one | 94 parts of | 5.5 parts of | 0.5 portion |
| Example two | 95 parts of | 4.5 parts of | 0.5 portion |
| EXAMPLE III | 96.5 portions | 3.3 parts of | 0.2 part |
| Example four | 94.5 portions of | 5.25 parts of | 0.25 part |
| EXAMPLE five | 95.5 parts | 4.25 parts of | 0.25 part |
| EXAMPLE six | 96 portions of | 3.8 parts of | 0.2 part |
| EXAMPLE seven | 97 portions of | 2.8 parts of | 0.2 part |
For each of the examples of rolled anisotropic flexible rare earth bonded magnets described in table 1, the anisotropic rare earth composite permanent magnetic powder in each example may be arranged in accordance with the component proportion scheme of the anisotropic rare earth composite permanent magnetic powder shown in table 2, which is the mass ratio of each component of the anisotropic rare earth composite permanent magnetic powder to the total amount of the anisotropic rare earth composite permanent magnetic powder.
Table 2:
each set of anisotropic rare earth composite permanent magnet powder described in table 2 can be subjected to surface treatment according to the proportioning scheme of any set of surface treatment agent provided in table 3, and the total mass of the anisotropic rare earth composite permanent magnet powder subjected to the surface treatment accounts for 94-97 parts of the total mass of the rolled anisotropic flexible rare earth bonded magnet to be prepared; the component contents of the surface treating agent which can be adopted when the corresponding anisotropic rare earth composite permanent magnet powder is subjected to surface treatment are shown in table 3;
table 3:
the following further describes the first embodiment, the second embodiment and the third embodiment mentioned in the above tables.
Example one
In this example, 94 parts of anisotropic rare earth composite permanent magnet powder subjected to surface treatment, 5.5 parts of binder and 0.5 part of processing aid are used. In the anisotropic rare earth composite permanent magnet powder after surface treatment, the anisotropic neodymium iron nitrogen permanent magnet powder after surface treatment accounts for 3 parts of the total amount of the anisotropic rare earth composite permanent magnet powder after surface treatment, the anisotropic samarium iron nitrogen permanent magnet powder after surface treatment accounts for 3 parts of the total amount of the anisotropic rare earth composite permanent magnet powder after surface treatment, the anisotropic ferrite powder after surface treatment accounts for 5 parts of the total amount of the anisotropic rare earth composite permanent magnet powder after surface treatment, and the neodymium iron boron permanent magnet powder with calendaring anisotropy after surface treatment accounts for 89 parts of the total amount of the anisotropic rare earth composite permanent magnet powder after surface treatment.
The surface treatment agent content adopted by the anisotropic rare earth composite permanent magnetic powder after surface treatment is as follows: the mass of the silane coupling agent is 0.5 percent of the total mass of the anisotropic rare earth composite permanent magnetic powder before surface treatment, the mass of the epoxy resin is 1 percent of the total mass of the anisotropic rare earth composite permanent magnetic powder before surface treatment, and the mass of the Mannich modified amine resin normal temperature curing agent is 50 percent of the mass of the epoxy resin.
The calendering process of the magnetic powder comprises the following steps: the temperature of an internal mixer used for mixing is 90-110 ℃, the internal mixed product is crushed and passes through a 12-mesh standard net, and the temperature of a calender is 40-50 ℃. The properties of the finally obtained magnet are shown in table 4.
Table 4:
| (BH)max(MGOe) | Br(KGs) | Hcj(kOe) | Hcb(kOe) |
| 10.41 | 6.80 | 16.13 | 5.90 |
wherein,
(BH) max (mgoe) in the table represents the maximum energy product of the magnet;
br (KGs) in the table represents the remanence of the magnet;
hcj (koe) in the table represents the intrinsic coercivity of the magnet;
hcb (koe) in the table represents the magnetic coercive force of the magnet;
the above performance indexes are english units of the magnetic performance indexes in the prior art, and are represented by the abbreviations known to those skilled in the art, and the abbreviations in the following list also have corresponding meanings, which are not described in detail.
In contrast to the prior art anisotropic rare earth magnetic powder having no rolling orientation, the magnetic properties of the magnet obtained by magnetic field orientation are shown in table 5.
Table 5:
| (BH)max(MGOe) | Br(KGs) | Hcj(kOe) | Hcb(kOe) |
| 8.22 | 5.90 | 15.36 | 5.36 |
example two
In this example, 95 parts of anisotropic rare earth composite permanent magnet powder after surface treatment, 4.5 parts of binder and 0.5 part of processing aid are used. In the anisotropic rare earth composite permanent magnet powder after surface treatment, the anisotropic neodymium iron nitrogen permanent magnet powder after surface treatment accounts for 3 parts of the total amount of the anisotropic rare earth composite permanent magnet powder after surface treatment, the anisotropic samarium iron nitrogen permanent magnet powder after surface treatment accounts for 3 parts of the total amount of the anisotropic rare earth composite permanent magnet powder after surface treatment, the anisotropic ferrite powder after surface treatment accounts for 4 parts of the total amount of the anisotropic rare earth composite permanent magnet powder after surface treatment, and the neodymium iron boron permanent magnet powder with calendaring anisotropy after surface treatment accounts for 90 parts of the total amount of the anisotropic rare earth composite permanent magnet powder after surface treatment.
The surface treatment agent content adopted by the anisotropic rare earth composite permanent magnetic powder after surface treatment is as follows: the mass of the silane coupling agent is 0.7 percent of the total mass of the anisotropic rare earth composite permanent magnetic powder before surface treatment, the mass of the epoxy resin is 1.5 percent of the total mass of the anisotropic rare earth composite permanent magnetic powder before surface treatment, and the mass of the Mannich modified amine resin normal temperature curing agent is 60 percent of the mass of the epoxy resin.
The calendering process of the magnetic powder comprises the following steps: the temperature of an internal mixer used for mixing is 90-110 ℃, the internal mixed product is crushed and passes through a 12-mesh standard net, and the temperature of a calender is 40-50 ℃. The properties of the finally obtained magnet are shown in table 6.
Table 6:
| (BH)max(MGOe) | Br(KGs) | Hcj(kOe) | Hcb(kOe) |
| 11.5 | 7.20 | 15.92 | 6.1 |
in contrast to the prior art anisotropic rare earth magnetic powder having no rolling orientation property, the magnetic properties of the magnet obtained by the magnetic field orientation are shown in table 7.
Table 7:
| (BH)max(MGOe) | Br(KGs) | Hcj(kOe) | Hcb(kOe) |
| 8.5 | 6.10 | 15.21 | 5.6 |
EXAMPLE III
In this example, 96.5 parts of anisotropic rare earth composite permanent magnet powder subjected to surface treatment, 3.3 parts of binder and 0.2 part of processing aid are used. In the anisotropic rare earth composite permanent magnet powder after surface treatment, the anisotropic neodymium iron nitrogen permanent magnet powder after surface treatment accounts for 3 parts of the total amount of the anisotropic rare earth composite permanent magnet powder after surface treatment, the anisotropic samarium iron nitrogen permanent magnet powder after surface treatment accounts for 2 parts of the total amount of the anisotropic rare earth composite permanent magnet powder after surface treatment, the anisotropic ferrite powder after surface treatment accounts for 4 parts of the total amount of the anisotropic rare earth composite permanent magnet powder after surface treatment, and the neodymium iron boron permanent magnet powder with rolling anisotropy after surface treatment accounts for 92 parts of the total amount of the anisotropic rare earth composite permanent magnet powder after surface treatment.
The surface treatment agent content adopted by the anisotropic rare earth composite permanent magnetic powder after surface treatment is as follows: the mass of the silane coupling agent is 0.8 percent of the total mass of the anisotropic rare earth composite permanent magnetic powder before surface treatment, the mass of the epoxy resin is 1.8 percent of the total mass of the anisotropic rare earth composite permanent magnetic powder before surface treatment, and the mass of the Mannich modified amine resin normal temperature curing agent is 70 percent of the mass of the epoxy resin.
The calendering process of the magnetic powder comprises the following steps: the temperature of an internal mixer used for mixing is 90-110 ℃, the internal mixed product is crushed and passes through a 12-mesh standard net, and the temperature of a calender is 40-50 ℃. The properties of the finally obtained magnet are shown in table 8.
Table 8:
| (BH)max(MGOe) | Br(KGs) | Hcj(kOe) | Hcb(kOe) |
| 12.4 | 7.60 | 15.12 | 6.8 |
in contrast to the prior art anisotropic rare earth magnetic powder having no rolling orientation property, the magnetic properties of the magnet obtained by the magnetic field orientation are shown in table 9.
Table 9:
| (BH)max(MGOe) | Br(KGs) | Hcj(kOe) | Hcb(kOe) |
| 9.0 | 6.50 | 15.02 | 6.1 |
the implementation of the embodiment of the invention can manufacture the permanent magnet product with the thickness of 0.5mm to 1200mm, and makes up the defects of the existing various permanent magnet materials, thereby providing a magnetic material with thin wall, large length-diameter ratio, good flexibility and higher magnetic performance for various permanent magnet application industries.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (6)
1. A calendered anisotropic flexible rare earth bonded magnet characterized by the components comprising: anisotropic rare earth composite permanent magnetic powder, a binder and a processing aid; the weight ratio of each component to the total weight is as follows:
94-97 parts of anisotropic rare earth composite permanent magnetic powder;
2.8 to 5.5 portions of adhesive;
0.2-0.5 parts of processing aid;
the anisotropic rare earth composite permanent magnet powder is subjected to surface treatment by a surface treatment agent.
2. The calendered anisotropic flexible rare earth bonded magnet of claim 1 wherein the anisotropic rare earth composite permanent magnet powder comprises the following components:
anisotropic ferrite permanent magnet powder, anisotropic samarium iron nitrogen permanent magnet powder, anisotropic neodymium iron nitrogen permanent magnet powder and neodymium iron nitrogen permanent magnet powder with rolling anisotropy;
the mass ratio of each component before surface treatment to the total amount of the anisotropic rare earth composite permanent magnetic powder is as follows:
the neodymium iron boron permanent magnet powder with rolling anisotropy comprises: 89-96 parts;
the anisotropic ferrite permanent magnetic powder comprises: 2-5 parts;
anisotropic samarium iron nitrogen permanent magnet powder comprises: 1-3 parts;
anisotropic neodymium iron nitrogen permanent magnetic powder comprises: 1 to 3 portions.
3. The calendered anisotropic flexible rare earth bonded magnet according to claim 1 or 2, wherein the composition of the surface treatment agent comprises: silane coupling agent, epoxy resin and Mannich modified amine resin normal temperature curing agent; wherein:
the mass of the silane coupling agent is 0.5-1% of the total mass of the anisotropic rare earth composite permanent magnetic powder before surface treatment,
the mass of the epoxy resin is 1-2% of the total mass of the anisotropic rare earth composite permanent magnetic powder before surface treatment,
the mass of the Mannich modified amine resin normal temperature curing agent is 50-80% of that of the epoxy resin.
4. The calendered anisotropic flexible rare earth bonded magnet according to claim 1 or 2, wherein the binder is at least one of chlorinated polyethylene, nitrile rubber, acetic acid-vinyl acetate copolymer, chlorosulfonated polyethylene, and thermoplastic elastomer.
5. The calendered anisotropic flexible rare earth bonded magnet according to claim 1 or 2, wherein the processing aid is a lubricant and a plasticizer at a mass ratio of 1: 1.
6. A method of producing a rolled anisotropic flexible rare earth bonded magnet, for producing the rolled anisotropic flexible rare earth bonded magnet according to any one of claims 1 to 6, characterized in that: the method comprises the following steps:
A. carrying out surface treatment on the anisotropic rare earth composite permanent magnetic powder by using a surface treating agent;
B. mixing the anisotropic rare earth composite permanent magnetic powder, the binder and the processing aid according to a preset proportion;
C. crushing the mixed product and enabling the crushed product to pass through a standard sieve with 12 meshes;
D. carrying out one-pass calendering molding on the undersize product on a calender to form a magnetic sheet;
E. and overlapping the magnetic sheets and rolling again to obtain the rolling anisotropic flexible rare earth bonded magnet.
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Effective date of registration: 20190725 Address after: 236000 Yingzhou Economic Development Zone, Fuyang City, Anhui Province Patentee after: Beikuang magnetic materials (Fuyang) Co., Ltd. Address before: 100070 Beijing Fengtai District South Fourth Ring West Road 188 18 District 23 Building 4 Floor Patentee before: North Polytron Technologies Inc |