CN110895985A - Mixed rare earth sintered neodymium-iron-boron permanent magnet and preparation method thereof - Google Patents
Mixed rare earth sintered neodymium-iron-boron permanent magnet and preparation method thereof Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
- H01F1/04—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys
- H01F1/047—Alloys characterised by their composition
- H01F1/053—Alloys characterised by their composition containing rare earth metals
- H01F1/055—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5
- H01F1/057—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
- H01F1/0571—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes
- H01F1/0575—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes pressed, sintered or bonded together
- H01F1/0577—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes pressed, sintered or bonded together sintered
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0253—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing permanent magnets
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0253—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing permanent magnets
- H01F41/0266—Moulding; Pressing
Abstract
The invention discloses a mixed rare earth sintered neodymium-iron-boron permanent magnet which comprises a mixed rare earth main phase and a Re-Fe-B main phase. The invention also discloses a preparation method of the mixed rare earth sintered neodymium iron boron permanent magnet. The invention utilizes the double-main-phase technology to ensure that the main phase of the mixed rare earth and the main phase of Re-Fe-B are respectively present in the magnet, and the two main phases are respectively subjected to targeted aging treatment from high temperature to low temperature, thereby optimizing the distribution and the microstructure of grain boundary phases in the magnet and ensuring that the magnet has higher coercive force.
Description
Technical Field
The invention relates to the field of rare earth permanent magnet material preparation, in particular to a mixed rare earth sintered neodymium iron boron permanent magnet and a preparation method thereof.
Background
The neodymium iron boron permanent magnet is a third-generation permanent magnet material, and is widely applied to the fields of the electronic industry, aerospace, medical appliances, wind power generation, electric automobiles, robots and the like due to the excellent comprehensive magnetic property of the material, so that the neodymium iron boron permanent magnet is the most widely applied permanent magnet material in the current market. The rare earth permanent magnet manufacturing industry mainly uses praseodymium-neodymium alloy as a raw material to manufacture neodymium-iron-boron permanent magnets, and light rare earth in China contains a large amount of La and Ce rare earth elements, so that the light rare earth is difficult to be effectively utilized.
The sintered Nd-Fe-B magnet is the permanent magnet material with the best magnetic performance at present and is most widely applied. The mixed rare earth alloy is added by using the traditional alloying method, so that the negative influence on the remanence and the coercive force of the neodymium iron boron magnet is large, and the magnetic performance is difficult to meet the application requirement.
Disclosure of Invention
The invention provides a mixed rare earth sintered neodymium iron boron permanent magnet and a preparation method thereof, which utilize a double-main-phase technology to ensure that a main phase of mixed rare earth and a main phase of Re-Fe-B exist in the magnet respectively, thereby ensuring that the magnet has higher magnetic performance.
The technical scheme is as follows:
the mixed rare earth sintered neodymium-iron-boron permanent magnet comprises a mixed rare earth main phase and a Re-Fe-B main phase, wherein the general formula of the Re-Fe-B main phase in percentage by mass is as follows: ReaFe 100-a-b-cBbc; the general formula of the mass percent of the main phase of the mixed rare earth is as follows: (MMxRe1-x) Fe 100-a-b-cBc, wherein MM is a mixed rare earth element, and the mass percent of MM is as follows: 48 percent of Ce, 20 to 35 percent of La, 78 to 7 percent of Pr4, 10 to 20 percent of Nd, less than or equal to 0.3 percent of Sm, less than or equal to 1 percent of Fe, less than or equal to 0.8 percent of Mg, less than or equal to 0.2 percent of Si, less than or equal to 0.03 percent of Ca, less than or equal to 0.02 percent of S, and less than or equal to 0.01 percent of P; m in Mb includes: one or more of Nb, V, Ti, Co, Cr, Mo, Mn, Ni, Ga, Zr, Ta, Ag, Au, Al, Pb, Cu and Si, wherein Re comprises: one or more elements of Pr, Nd, Sm, Eu, Gd, Ho, Dy and Tb, wherein a is more than or equal to 25 and less than or equal to 35, b is more than or equal to 0.5 and less than or equal to 2, c is more than or equal to 0.8 and less than or equal to 1.5, and x is more than or equal to 0.1 and less than or equal to 1.
Furthermore, a is more than or equal to 29 and less than or equal to 32, b is more than or equal to 0.5 and less than or equal to 2, c is more than or equal to 0.9 and less than or equal to 1, and x is more than or equal to 0.3 and less than or equal to 0.5.
Furthermore, the Re-Fe-B main phase accounts for 10-95% of the total mass of the mixed rare earth sintered neodymium-iron-boron permanent magnet, and the mixed rare earth main phase accounts for 5-90% of the total mass of the mixed rare earth sintered neodymium-iron-boron permanent magnet.
Furthermore, the main phase of the mixed rare earth accounts for 10-30% of the total mass of the mixed rare earth sintered neodymium-iron-boron permanent magnet.
A preparation method of a mixed rare earth sintered neodymium iron boron permanent magnet comprises the following steps:
respectively batching according to the components of the Re-Fe-B alloy with high HA content and the mixed rare earth alloy with low HA content, respectively obtaining rapid hardening melt-spun strips of two alloys with the thickness of 0.2-0.5 mm by adopting a rapid hardening melt-spun technology, and respectively preparing magnetic powder with the average particle size of 2-5 mu m from the rapid hardening melt-spun strips of the two alloys through hydrogen crushing and air flow milling;
mixing the two kinds of magnetic powder under the protection of nitrogen, mixing for 1-3 h in a mixing tank, performing orientation molding in a 1.5-2T magnetic field after uniform mixing, and preparing a green body through cold isostatic pressing;
and (3) sintering the green body in a vacuum sintering furnace at the sintering temperature of 1000-1150 ℃ for 1-10 h to obtain a sintered magnet, and tempering the sintered magnet to obtain the mixed rare earth sintered neodymium-iron-boron permanent magnet.
Preferably, the Re-Fe-B with high HA forms the Re-Fe-B major phase and the misch metal with low HA forms the misch metal major phase.
Preferably, the tempering treatment may include: high-temperature tempering treatment and low-temperature tempering treatment.
Preferably, the high-temperature tempering treatment is performed by selecting at least one temperature between 800 and 950 ℃; the low-temperature tempering treatment is performed for 2-10 hours at least one selected temperature of 400-650 ℃.
Preferably, the cold isostatic pressing pressure is 200 MPa.
The invention has the technical effects that:
(1) the invention utilizes the double-main-phase technology to ensure that the main phase of the mixed rare earth and the main phase of Re-Fe-B exist in the magnet respectively, thereby ensuring that the magnet has higher magnetic performance.
The heterogeneous sintered neodymium-iron-boron magnet manufactured by the double-main-phase alloy method can effectively avoid magnetic attenuation caused by addition of La and Ce elements, and realizes partial substitution of La and Ce for Pr and Nd. The sintering and tempering process can effectively adjust the distribution of the main phase and the grain boundary phase, and has a decisive effect on the final magnetic property of the magnet. The selection of proper sintering and tempering processes has important significance for optimizing the microstructure of the mixed rare earth-added neodymium iron boron magnet and improving the magnetic performance.
(2) The aging treatment is respectively carried out on the two main phases from high temperature to low temperature, so that the distribution and the microstructure of the grain boundary phase in the magnet are optimized, and the magnet has higher coercive force.
(3) The mixed rare earth sintered neodymium-iron-boron permanent magnet produced by using the mixed rare earth can obviously reduce the raw material cost for producing the magnet, and is beneficial to the comprehensive utilization of rare earth elements.
The proportion of each component of La, Ce, Pr and Nd in Mischmetal (MM) maintains the proportion in ore, and because the separation process flow is reduced, the Mischmetal alloy has obvious price advantage, is beneficial to the balanced utilization of rare earth resources, can well fill the application requirement between ferrite and neodymium iron boron, and has important significance for promoting the healthy and stable development of rare earth permanent magnets.
According to the characteristics of rare earth resources in China, the price of the mixed rare earth metal obtained by chemically treating the baiyunebo ore is only about one fifth of that of praseodymium-neodymium alloy, the mixed rare earth is used for partially replacing praseodymium-neodymium alloy to prepare and produce the sintered permanent magnet, the comprehensive utilization of the rare earth resources can be promoted, and the industrial cost of the sintered neodymium-iron-boron permanent magnet is reduced.
Detailed Description
The following description sufficiently illustrates specific embodiments of the invention to enable those skilled in the art to practice and reproduce it.
The preparation method of the mixed rare earth sintered neodymium iron boron permanent magnet comprises the following specific steps:
step 1: according to high HARe-Fe-B alloy of (A) and Low HAThe components of the mixed rare earth alloy are respectively proportioned, and the quick-setting melt-spun strips of two alloys with the thickness of 0.2-0.5 mm are respectively obtained by adopting a quick-setting melt-spun technology, and are respectively prepared into magnetic powder with the average particle size of 2-5 mu m through hydrogen crushing and jet milling;
step 2: mixing the two kinds of magnetic powder according to a ratio under the protection of nitrogen, mixing for 1-3 h in a mixing tank, carrying out orientation molding under a magnetic field of 1.5-2T after uniform mixing, and preparing a green body through cold isostatic pressing at 200 MPa;
and step 3: sintering the green body in a vacuum sintering furnace at the sintering temperature of 1000-1150 ℃ for 1-10 h to obtain a sintered magnet;
and 4, step 4: and tempering different main phases existing in the sintered magnet to obtain the mixed rare earth sintered neodymium-iron-boron permanent magnet.
The tempering treatment may include: multi-stage high-temperature tempering treatment and low-temperature tempering treatment. The multistage tempering treatment is to select one or more temperatures between 800 ℃ and 950 ℃ to carry out high-temperature tempering heat treatment for 2 to 10 hours, and select one or more temperatures between 400 ℃ and 650 ℃ to carry out low-temperature tempering heat treatment for 2 to 10 hours. Tempering treatment is carried out aiming at different main phases existing in the magnet, so that the distribution and the microstructure of grain boundary phases in the magnet are optimized, and the magnet has higher coercive force.
The mixed rare earth sintered Nd-Fe-B permanent magnet comprises a mixed rare earth main phase and a Re-Fe-B main phase.
High HAThe Re-Fe-B forms a Re-Fe-B main phase, and the general formula of the mass percent of the Re-Fe-B main phase is as follows: reaFe100-a-b- cMbBc。MbWherein M is one or more of Nb, V, Ti, Co, Cr, Mo, Mn, Ni, Ga, Zr, Ta, Ag, Au, Al, Pb, Cu and Si, Re is one or more of Pr, Nd, Sm, Eu, Gd, Ho, Dy and Tb, and B is boron, wherein a is more than or equal to 25 and less than or equal to 35, B is more than or equal to 0.5 and less than or equal to 2, c is more than or equal to 0.8 and less than or equal to 1.5, and x is more than or equal to 0.1 and less than or equal to 1.
Low HAThe mixed rare earth forms a mixed rare earth main phase, and the mass percentage general formula of the mixed rare earth main phase is as follows: (MM)xRe1-x)Fe100-a-b-cMbBcMM is mixed rare earth elements, and the mass percentages of the components in the mixed rare earth elements are as follows: ce>48％，La 20～35％，Pr4～7％，Nd 10～20％，Sm≤0.3％，Fe≤1％，Mg≤0.8％，Si≤0.2％，Ca≤0.03％，S≤0.02％，P≤0.01％，MbWherein M is one or more of Nb, V, Ti, Co, Cr, Mo, Mn, Ni, Ga, Zr, Ta, Ag, Au, Al, Pb, Cu and Si, Re is one or more of Pr, Nd, Sm, Eu, Gd, Ho, Dy and Tb, and B is boron, wherein a is more than or equal to 25 and less than or equal to 35, B is more than or equal to 0.5 and less than or equal to 2, c is more than or equal to 0.8 and less than or equal to 1.5, and x is more than or equal to 0.1 and less than or equal to 1. a. b, c and x are constants.
In the preferred embodiment, a is more than or equal to 29 and less than or equal to 32, b is more than or equal to 0.5 and less than or equal to 2, c is more than or equal to 0.9 and less than or equal to 1, and x is more than or equal to 0.3 and less than or equal to 0.5.
In the preferred embodiment, the Re-Fe-B main phase accounts for 10-95% of the total mass of the mixed rare earth sintered Nd-Fe-B permanent magnet, and the mixed rare earth main phase accounts for 5-90% of the total mass of the mixed rare earth sintered Nd-Fe-B permanent magnet. Furthermore, the main phase of the mixed rare earth accounts for 10-30% of the total mass of the mixed rare earth sintered neodymium-iron-boron permanent magnet.
When the rare earth permanent magnet contains two or more kinds of mixed rare earth permanent magnet main phases, the components of each mixed rare earth permanent magnet main phase are different.
The present invention will be described in further detail with reference to the following examples, but the present invention is not limited to the following examples:
comparative example 1
The mass percentage is (MM)0.625Re0.375)30FebalB1Cu0.1Al0.2And (PrNd)30FebalB1Cu0.1Al0.5Zr0.1The main phase alloy is respectively prepared into powder with the average powder granularity of less than 3.5 mu m by adopting the process flows of rapid hardening melt spinning, hydrogen crushing and jet milling. The mass ratio of 3: 7 (MM)30FebalB1Cu0.1Al0.2And (PrNd)30FebalB1Cu0.1Al0.5Zr0.1Adding lubricant and antioxidant into the magnetic powder, mixing, orienting and molding the magnetic powder in a 2T magnetic field under the protection of nitrogen, and cold isostatic pressing at 200MPa to obtain a green body. Putting the green body into a vacuum sintering furnace, sintering at 1060 ℃ and preserving heat for 4 hours; then tempering at 900 deg.C for 3h, and then tempering at 540 deg.C for 2h to obtain magnet with magnetic properties shown in Table 1As shown.
Example 1
The mass percentage is (MM)0.625Re0.375)30FebalB1Cu0.1Al0.2And (PrNd)30FebalB1Cu0.1Al0.5Zr0.1The main phase alloy is respectively prepared into powder with the average powder granularity of less than 3.5 mu m by adopting the process flows of rapid hardening melt spinning, hydrogen crushing and jet milling. The mass ratio of 3: 7 (MM)30FebalB1Cu0.1Al0.2And (PrNd)30FebalB1Cu0.1Al0.5Zr0.1Adding lubricant and antioxidant into the magnetic powder, mixing, orienting and molding the magnetic powder in a 2T magnetic field under the protection of nitrogen, and cold isostatic pressing at 200MPa to obtain a green body. Putting the green body into a vacuum sintering furnace, sintering at 1060 ℃ and preserving heat for 4 hours; then carrying out high-temperature tempering heat treatment at 900 ℃ for 3h, then carrying out primary low-temperature tempering treatment at 540 ℃ for 2h, and carrying out secondary low-temperature tempering treatment at 500 ℃ for 2 h. The magnetic properties of the obtained magnet are shown in Table 1.
TABLE 1
| Performance parameter | Br/kGs | Hcj/kOe | (BH)max/MGOe | Squareness/%) |
| Comparative example 1 | 13.52 | 8.948 | 41.76 | 75.6 |
| Example 1 | 13.66 | 9.533 | 43.37 | 77.5 |
Comparative example 2
The mass percentage is (MM)30FebalB1Cu0.1Al0.2And (PrNd)30FebalB1Cu0.1Al0.5Zr0.1The main phase alloy is respectively prepared into powder with the average powder granularity of less than 3.5 mu m by adopting the process flows of rapid hardening melt spinning, hydrogen crushing and jet milling. The mass ratio of 3: 13 (MM)30FebalB1Cu0.1Al0.2And (PrNd)30FebalB1Cu0.1Al0.5Zr0.1Adding lubricant and antioxidant into the magnetic powder, mixing, orienting and molding the magnetic powder in a 2T magnetic field under the protection of nitrogen, and cold isostatic pressing at 200MPa to obtain a green body. Putting the green body into a vacuum sintering furnace, sintering at 1060 ℃ and preserving heat for 4 hours; then carrying out high-temperature tempering heat treatment at 900 ℃ for 3h, and then carrying out low-temperature tempering treatment at 540 ℃ for 2 h. The magnetic properties of the obtained magnet are shown in Table 2.
Example 2
The mass percentage is (MM)30FebalB1Cu0.1Al0.2And (PrNd)30FebalB1Cu0.1Al0.5Zr0.1The main phase alloy is respectively prepared into powder with the average powder granularity of less than 3.5 mu m by adopting the process flows of rapid hardening melt spinning, hydrogen crushing and jet milling. The mass ratio of 3: 13 (MM)30FebalB1Cu0.1Al0.2And (PrNd)30FebalB1Cu0.1Al0.5Zr0.1Adding lubricant and antioxidant into the magnetic powder, mixing, orienting and molding the magnetic powder in a 2T magnetic field under the protection of nitrogen, and cold isostatic pressing at 200MPa to obtain a green body. Putting the green body into a vacuum sintering furnace, sintering at 1060 ℃ and preserving heat for 4 hours; then carrying out high-temperature tempering heat treatment at 900 ℃ for 3h, then carrying out primary low-temperature tempering treatment at 540 ℃ for 2h, and carrying out secondary low-temperature tempering treatment at 500 ℃ for 2 h. The magnetic properties of the obtained magnet are shown in Table 2.
TABLE 2
Comparative example 3
The mass percentage is (MM)30FebalB1Cu0.1Al0.2And (PrNd)30FebalB1Cu0.1Al0.5Zr0.1The main phase alloy is respectively prepared into powder with the average powder granularity of less than 3.5 mu m by adopting the process flows of rapid hardening melt spinning, hydrogen crushing and jet milling. The mass ratio of 3: 7 (MM)30FebalB1Cu0.1Al0.2And (PrNd)30FebalB1Cu0.1Al0.5Zr0.1Adding lubricant and antioxidant into the magnetic powder, mixing, orienting and molding the magnetic powder in a 2T magnetic field under the protection of nitrogen, and cold isostatic pressing at 200MPa to obtain a green body. Putting the green body into a vacuum sintering furnace, sintering at 1060 ℃ and preserving heat for 4 hours; then carrying out high-temperature tempering heat treatment at 900 ℃ for 3h, and then carrying out low-temperature tempering treatment at 485 ℃ for 2 h. The magnetic properties of the obtained magnet are shown in Table 3.
Example 3
The mass percentage is (MM)30FebalB1Cu0.1Al0.2And (PrNd)30FebalB1Cu0.1Al0.5Zr0.1The main phase alloy is respectively prepared into powder with the average powder granularity of less than 3.5 mu m by adopting the process flows of rapid hardening melt spinning, hydrogen crushing and jet milling. The mass ratio of 3: 7 (MM)30FebalB1Cu0.1Al0.2And (PrNd)30FebalB1Cu0.1Al0.5Zr0.1Adding lubricant and antioxidant into the magnetic powder, mixing, orienting and molding the magnetic powder in a 2T magnetic field under the protection of nitrogen, and cold isostatic pressing at 200MPa to obtain a green body. Putting the green body into a vacuum sintering furnace, sintering at 1060 ℃ and preserving heat for 4 hours; then carrying out high-temperature tempering heat treatment at 900 ℃ for 3h, then carrying out primary low-temperature tempering treatment at 540 ℃ for 2h, and carrying out secondary low-temperature tempering treatment at 485 ℃ for 2 h. The magnetic properties of the obtained magnet are shown in Table 3.
Example 4
The mass percentage is (MM)30FebalB1Cu0.1Al0.2And (PrNd)30FebalB1Cu0.1Al0.5Zr0.1The main phase alloy is respectively prepared into powder with the average powder granularity of less than 3.5 mu m by adopting the process flows of rapid hardening melt spinning, hydrogen crushing and jet milling. The mass ratio of 3: 7 (MM)30FebalB1Cu0.1Al0.2And (PrNd)30FebalB1Cu0.1Al0.5Zr0.1Adding lubricant and antioxidant into the magnetic powder, mixing, orienting and molding the magnetic powder in a 2T magnetic field under the protection of nitrogen, and cold isostatic pressing at 200MPa to obtain a green body. Putting the green body into a vacuum sintering furnace, sintering at 1060 ℃ and preserving heat for 4 hours; then carrying out high-temperature tempering heat treatment at 900 ℃ for 3h, then carrying out primary low-temperature tempering treatment at 540 ℃ for 2h, and carrying out secondary low-temperature tempering treatment at 500 ℃ for 2 h. The magnetic properties of the obtained magnet are shown in Table 3.
TABLE 3
| Performance parameter | Br/kGs | Hcj/kOe | (BH)max/MGOe | Squareness/%) |
| Comparative example 3 | 12.67 | 6.084 | 32.18 | 74.0 |
| Example 3 | 13.08 | 6.566 | 36.11 | 76.3 |
| Example 4 | 13.04 | 6.417 | 35.50 | 76.7 |
The terminology used herein is for the purpose of description and illustration, rather than of limitation. As the present invention may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalences of such meets and bounds are therefore intended to be embraced by the appended claims.
Claims (9)
1. The mixed rare earth sintered neodymium-iron-boron permanent magnet is characterized by comprising a mixed rare earth main phase and a Re-Fe-B main phase, wherein the general formula of the Re-Fe-B main phase in percentage by mass is as follows: reaFe100-a-b-cMbBc(ii) a The general formula of the mass percent of the main phase of the mixed rare earth is as follows: (MM)xRe1-x)Fe100-a-b-cMbBcMM is mixed rare earth elements, and the mass percent of MM is as follows: ce>48％，La 20～35％，Pr4～7％，Nd 10～20％，Sm≤0.3％，Fe≤1％，Mg≤0.8％，Si≤0.2％，Ca≤0.03％，S≤0.02％，P≤0.01％；MbM in (1) includes: one or more of Nb, V, Ti, Co, Cr, Mo, Mn, Ni, Ga, Zr, Ta, Ag, Au, Al, Pb, Cu and Si, wherein Re comprises: one or more elements of Pr, Nd, Sm, Eu, Gd, Ho, Dy and Tb, wherein a is more than or equal to 25 and less than or equal to 35, b is more than or equal to 0.5 and less than or equal to 2, c is more than or equal to 0.8 and less than or equal to 1.5, and x is more than or equal to 0.1 and less than or equal to 1.
2. The mixed rare earth sintered NdFeB permanent magnet as claimed in claim 1 wherein a is 29. ltoreq. a.ltoreq.32, b is 0.5. ltoreq. b.ltoreq.2, c is 0.9. ltoreq. c.ltoreq.1, and x is 0.3. ltoreq. x.ltoreq.0.5.
3. The sintered ndfeb permanent magnet of claim 1, wherein the primary phase of Re-Fe-B is 10% to 95% of the total mass of the sintered ndfeb permanent magnet and the primary phase of misch metal is 5% to 90% of the total mass of the sintered ndfeb permanent magnet.
4. The misch metal sintered ndfeb permanent magnet of claim 1, wherein the misch metal primary phase comprises 10% to 30% of the total mass of the misch metal sintered ndfeb permanent magnet.
5. A preparation method of a mixed rare earth sintered neodymium iron boron permanent magnet comprises the following steps:
according to high HARe-Fe-B alloy of (A) and Low HAThe components of the mixed rare earth alloy are respectively proportioned, and the thickness of the mixed rare earth alloy is obtained by adopting a rapid hardening and strip throwing technology0.2-0.5 mm of rapid hardening and flapping sheets of two alloys, and respectively preparing magnetic powder with the average particle size of 2-5 mu m by hydrogen crushing and airflow milling the rapid hardening and flapping sheets of the two alloys;
mixing the two kinds of magnetic powder under the protection of nitrogen, mixing for 1-3 h in a mixing tank, performing orientation molding in a 1.5-2T magnetic field after uniform mixing, and preparing a green body through cold isostatic pressing;
and (3) sintering the green body in a vacuum sintering furnace at the sintering temperature of 1000-1150 ℃ for 1-10 h to obtain a sintered magnet, and tempering the sintered magnet to obtain the mixed rare earth sintered neodymium-iron-boron permanent magnet.
6. The method for preparing mixed rare earth sintered NdFeB permanent magnet as claimed in claim 5, wherein the H is highARe-Fe-B of (A) forms the Re-Fe-B main phase, low in HAThe misch metal of (a) forms a misch metal main phase.
7. The method for preparing the mixed rare earth sintered neodymium-iron-boron permanent magnet according to claim 5, wherein the tempering treatment comprises the following steps: high-temperature tempering treatment and low-temperature tempering treatment.
8. The method for preparing the mixed rare earth sintered neodymium-iron-boron permanent magnet according to claim 7, wherein the high-temperature tempering treatment is performed by selecting at least one temperature between 800 ℃ and 950 ℃; the low-temperature tempering treatment is performed for 2-10 hours at least one selected temperature of 400-650 ℃.
9. The method for preparing the misch metal sintered neodymium-iron-boron permanent magnet according to claim 5, wherein the pressure of the cold isostatic pressing is 200 MPa.
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| CN201911076569.5A Pending CN110895985A (en) | 2019-11-06 | 2019-11-06 | Mixed rare earth sintered neodymium-iron-boron permanent magnet and preparation method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112750586A (en) * | 2020-12-28 | 2021-05-04 | 包头稀土研究院 | Mixed rare earth sintered neodymium-iron-boron permanent magnet and preparation method thereof |
| CN113223842A (en) * | 2021-04-24 | 2021-08-06 | 宁波市镇海兴强磁性材料有限公司 | High-stability neodymium iron boron magnet and preparation method thereof |
| EP4152349A1 (en) * | 2021-09-16 | 2023-03-22 | Yantai Dongxing Magnetic Materials Inc. | Method for preparing ndfeb magnets including lanthanum or cerium |
| CN116825462A (en) * | 2023-08-17 | 2023-09-29 | 宁波恒宏磁业有限公司 | Vehicle-mounted Gao Wen-iron-boron-resistant permanent magnet and preparation method thereof |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112750586A (en) * | 2020-12-28 | 2021-05-04 | 包头稀土研究院 | Mixed rare earth sintered neodymium-iron-boron permanent magnet and preparation method thereof |
| CN112750586B (en) * | 2020-12-28 | 2024-03-29 | 包头稀土研究院 | Mixed rare earth sintered NdFeB permanent magnet and preparation method thereof |
| CN113223842A (en) * | 2021-04-24 | 2021-08-06 | 宁波市镇海兴强磁性材料有限公司 | High-stability neodymium iron boron magnet and preparation method thereof |
| CN113223842B (en) * | 2021-04-24 | 2022-11-15 | 宁波市镇海兴强磁性材料有限公司 | High-stability neodymium iron boron magnet and preparation method thereof |
| EP4152349A1 (en) * | 2021-09-16 | 2023-03-22 | Yantai Dongxing Magnetic Materials Inc. | Method for preparing ndfeb magnets including lanthanum or cerium |
| CN116825462A (en) * | 2023-08-17 | 2023-09-29 | 宁波恒宏磁业有限公司 | Vehicle-mounted Gao Wen-iron-boron-resistant permanent magnet and preparation method thereof |
| CN116825462B (en) * | 2023-08-17 | 2024-04-09 | 宁波恒宏磁业有限公司 | Vehicle-mounted Gao Wen-iron-boron-resistant permanent magnet and preparation method thereof |
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