CN112103068A - Preparation method of high-magnetic-performance 1:5 pure samarium cobalt permanent magnet - Google Patents
Preparation method of high-magnetic-performance 1:5 pure samarium cobalt permanent magnet Download PDFInfo
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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
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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
- H01F1/0555—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 pressed, sintered or bonded together
- H01F1/0557—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 pressed, sintered or bonded together sintered
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Abstract
The invention discloses a preparation method of a high-magnetic-performance 1:5 pure samarium cobalt permanent magnet, which comprises the following steps: firstly, smelting and quickly solidifying and throwing slices; secondly, coarse crushing; thirdly, fine grinding to prepare powder; fourthly, pressing and forming; and fifthly, sintering. The invention has the beneficial effects that: two main phase alloy powders with close components and granularity are respectively prepared and respectively used as a samarium-rich phase and a cobalt-rich phase, and a magnet with stable temperature and compact density is obtained by utilizing the coupling effect between the two phases, so that the risks of volatilization and oxidation of samarium can be eliminated, and the magnetic performance is effectively improved.
Description
Technical Field
The invention relates to the field of permanent magnet materials, in particular to a preparation method of a high-magnetism 1:5 pure samarium cobalt permanent magnet.
Background
The 1:5 pure samarium cobalt permanent magnet material only contains samarium and cobalt elements as the name suggests, compared with the traditional 1:5 type samarium cobalt material, the component is monotonous and concentrated, the samarium element content in the alloy exceeds 34 percent, the physical property is relatively rigid, and the chemical property is active. Compared with 2:17 type samarium cobalt, 1:5 samarium cobalt magnet is easier to be magnetized and saturated in the magnetizing process, and the required magnetic field is smaller than that of 2:17 type samarium cobalt, so that the mechanical property is more excellent, the online magnetizing is facilitated, and the magnet is more favored in the application of certain automobile electronic products. In order to obtain better remanence performance, part of Sm is replaced by Pr in the traditional 1:5 samarium cobalt, and the permanent magnet material (SmPr) Co5 is prepared. In order to improve the performance of 1:5 samarium cobalt and reduce the cost in industrial production, elements such as Fe, Sn and the like are also added, which are the main components of the current 1:5 samarium cobalt. Although the magnetic energy product and the magnetic moment are enhanced, the magnet is easier to oxidize, unstable in magnetic property and easy to corrode in the preparation process. The 1:5 type pure samarium cobalt material has high magnetocrystalline anisotropy and high anisotropy field, and the theoretical maximum magnetic energy product reaches 31 MGOe. Because no Pr is contained, the corrosion resistance and the oxidation resistance of the alloy are superior to those of the traditional 1:5 type samarium cobalt. But the optimal performance window is narrow because the components are too single and concentrated (only consisting of metal samarium and metal cobalt). Meanwhile, in the process of preparing and sintering the 1:5 pure samarium cobalt permanent magnet material, because the samarium content is higher and is very sensitive to temperature, the samarium is very easy to oxidize and volatilize, the phase composition segregation of the magnet can be caused by the slight change of the samarium content, the density change of the sintered magnet is obvious, and the performance consistency and the stability are poor.
Chinese patent document CN110957090A discloses "a samarium cobalt 1: the type 5 permanent magnet material and the preparation method thereof are introduced according to the disclosure, and the samarium cobalt type 1:5 permanent magnet material comprises the following preparation raw materials in parts by weight: 34 to 36 percent of metal samarium and 64 to 66 percent of metal cobalt; the preparation method of the samarium cobalt 1:5 type permanent magnet material comprises the following steps: proportioning, smelting and casting, homogenizing and treating the casting, milling into powder by airflow milling, molding and sintering for aging. According to the samarium cobalt 1:5 type permanent magnet material provided by the invention, the 1:5 samarium cobalt quick-setting melt-spun strip is subjected to homogenization treatment and matched with a proper air flow grinding process, so that the residual magnetism and the coercive force performance of the 1:5 samarium cobalt permanent magnet are improved, the residual magnetism can reach over 9.8kGs, the coercive force can reach over 35kOe, the process can stabilize mass production, and the qualification rate can reach over 95%.
In the prior art, the temperature of homogenization heat treatment reaches 900-950 ℃, the time is 4-8 hours, although the magnetic performance can be promoted theoretically, the content of samarium in a 1:5 pure samarium cobalt permanent magnetic material is high, and samarium volatilization is easily caused by high-temperature and long-time heat treatment, so that the prior art still can not substantially get rid of the contradiction that the heat treatment can promote the magnetic performance and the heat treatment can cause the samarium volatilization so as to reduce the magnetic performance. Therefore, the prior art prolongs the production time, and inevitably increases the risks of samarium volatilization and oxidation in the heat treatment process.
Disclosure of Invention
Based on the problems, the invention provides a preparation method of a pure samarium cobalt permanent magnet with high magnetic property of 1:5, which is characterized in that two main phase alloy powders with close components and particle sizes are respectively prepared to serve as a samarium-rich phase and a cobalt-rich phase, and a magnet with stable temperature and compact density is obtained by utilizing the coupling effect between the two phases. The method has the advantages that the risks of samarium volatilization and oxidation are eliminated, and the magnetic performance and the sintering temperature range are effectively improved.
In order to realize the purpose of the invention, the invention adopts the following technical scheme: a preparation method of a high-magnetic-performance 1:5 pure samarium cobalt permanent magnet comprises the following steps:
firstly, smelting and quickly solidifying and throwing slices; weighing a certain amount of high-purity metal samarium and metal cobalt and putting the high-purity metal samarium and the metal cobalt into a vacuum rapid hardening melt-spun furnace; vacuumizing, heating, controlling the smelting temperature, and casting after refining the materials; repeating the operation once according to different samarium-cobalt ratios to respectively obtain samarium-rich phase rapid-solidification flail plates SmCoxCobalt-rich phase rapid-hardening melt-spun sheet SmCoy，x＜y；
Secondly, coarse crushing; rapidly solidifying samarium-rich phase to obtain SmCo melt spun sheetxCobalt-rich phase rapid-hardening melt-spun sheet SmCoyRespectively putting the powder into a mortar, crushing the powder by using a punch, and sieving coarse crushed powder obtained by crushing to obtain samarium-rich phase alloy coarse powder and cobalt-rich phase alloy coarse powder;
thirdly, fine grinding to prepare powder; mixing the two alloy coarse powders according to a proper proportion, and crushing by using an airflow mill to finally obtain a mixture of 1:5 samarium cobalt magnetic powder;
fourthly, pressing and forming; mixing the raw materials of 1: pressing and molding the 5 samarium cobalt magnetic powder by a molding press to obtain a molded blank;
fifthly, sintering; and placing the formed blank in a sintering furnace, vacuumizing, filling inert gas, heating and sintering, slowly cooling to 900 +/-50 ℃ after sintering, preserving heat and aging, and quickly cooling to room temperature to obtain a final finished product.
Preferably, in the first step, the rotation speed of a copper roller of the vacuum rapid hardening melt-spun furnace is 47 +/-10 r/min.
Preferably, in the first step, the thickness of the throwing sheet is 0.15-0.3 mm.
Preferably, in the step one, samarium-rich phase rapid hardening melt spun sheet SmCoxCobalt-rich phase rapid-hardening melt-spun sheet SmCoyIn the formula, x is more than or equal to 3.9 and less than or equal to y and less than or equal to 4.9, and y-x is less than or equal to 0.3.
Preferably, in the second step, a nitrogen gas pipe is connected to the ram head of the press, and nitrogen gas is introduced into the mortar through the nitrogen gas pipe.
Preferably, in the second step, a cooling device is arranged around the mortar.
Preferably, in the second step, the upper limit of the particle size range of the sieved cobalt-rich phase alloy coarse powder is smaller than the upper limit of the particle size range of the samarium-rich phase alloy coarse powder. Considering that the stability of the samarium-rich phase alloy coarse powder is poorer than that of the cobalt-rich phase alloy coarse powder, the alloy coarse powder is designed to be more than that of the cobalt-rich phase alloy coarse powder, so that the samarium content is ensured to be stable to the maximum extent; and secondly, the brittleness of the components of the samarium-rich phase alloy coarse powder is better than that of the cobalt-rich phase alloy coarse powder, so that the samarium-rich phase alloy coarse powder with larger particle size is easier to crush in the air flow milling process, the effective design of the particle sizes of two phases can ensure that the samarium-rich phase alloy coarse powder with better brittleness is not too small to crush, the consistency of the mixed two-phase alloy coarse powder is improved, and the coercive force of a final product is effectively improved.
Preferably, in the third step, a grinding aid is further added when the two alloy coarse powders are mixed; the addition amount of the grinding aid is 0.05% of the total mixed mass of the alloy coarse powder.
Preferably, in the fourth step, the forming magnetic field is 1.5-2.5T, and the isostatic pressure is 250 MPa.
Preferably, in the fifth step, the sintering temperature is 1150-1170 ℃, and the aging heat preservation time is 2 h.
Compared with the prior art, the preparation method of the pure samarium cobalt permanent magnet with high magnetic performance of 1:5 designed by the scheme has two differences:
firstly, the traditional scheme adopts a method of simultaneously putting two elements into smelting at one time; the scheme adopts the technical scheme that the samarium cobalt alloy with two different proportions is firstly smelted and then is respectively ground and then mixed in proportion according to the two different proportions. In the traditional scheme, the traditional scheme with one-time accurate proportioning is particularly sensitive to temperature during smelting, the temperature range is narrow to only change by 5 ℃ from top to bottom, and the defects of large samarium volatilization amount and difficulty in controlling grain boundaries exist. The two-phase composite process adopted by the scheme can completely avoid a specific temperature interval caused by a specific formula when the samarium-rich phase alloy and the cobalt-rich phase alloy are prepared by smelting, so that the effects of small samarium volatilization and convenient control of crystal boundary are realized, and the two alloys are crushed and mixed to still obtain the pure samarium cobalt permanent magnet with the required high magnetic property of 1: 5.
Secondly, the traditional scheme has a step of homogenization heat treatment, which can cause samarium volatilization and oxidation, and finally reduce the magnetic performance. In the scheme, a two-phase composite process is adopted, and the samarium-rich phase alloy and the cobalt-rich phase alloy are crushed and then mixed, so that the step of homogenization heat treatment is thoroughly abandoned, and the defects of volatilization and oxidation of samarium and final reduction of magnetic performance do not exist in the scheme.
In addition, there is a method of mixing an alloy having a high residual magnetic component characteristic with an alloy having a high coercive component characteristic to obtain a high-performance samarium-cobalt magnet, as described in CN103065788B, in view of a 2:17 samarium-cobalt or neodymium-iron-boron powder mixing method. However, the method ignores the special physicochemical property of pure samarium cobalt, namely that the pure samarium cobalt has concentrated and single components, is different from other alloys such as 2:17 samarium cobalt and the like, and has complex components and structures. Wherein, part of samarium is used as a liquid phase component, which is the guarantee of pure samarium cobalt sintering compactness and must prevent the introduction and volatilization of oxygen. And is different from 2: pure samarium cobalt and neodymium iron boron multicomponent alloy, pure samarium cobalt is very sensitive to sintering temperature, single element or particle size deviation can make sintering temperature difference huge (two phases of mixed alloy, one phase is sintered completely, crystal grain growth is obvious, and the other phase may not be sintered to form 1:5 phase), performance influence is difficult to depend on other element complementation, two phases of selective coupling effect can not be selected from the aspect of performance complementation, more physical and chemical properties and particle size control need to be considered for optimization and adjustment, and the scheme is innovative.
In conclusion, the beneficial effects of the invention are as follows: two main phase alloy powders with close components and granularity are respectively prepared and respectively used as a samarium-rich phase and a cobalt-rich phase, and a magnet with stable temperature and compact density is obtained by utilizing the coupling effect between the two phases, so that the risks of volatilization and oxidation of samarium can be eliminated, and the magnetic performance is effectively improved.
Detailed Description
The present invention will be further described with reference to specific embodiments and comparative examples.
Example 1
Firstly, smelting and quickly solidifying and throwing slices; SmCo according to the chemical formula4.3Weighing a certain amount of samarium metal with the purity of 99.95 percent and electrolytic cobalt with the purity of 99.98 percent into a vacuum rapid hardening melt-spun furnace according to the mixture ratio; vacuumizing, heating, controlling the smelting temperature to be 1600 +/-5 ℃, and refining the materials for 3min and then casting; then SmCo is added4.6The operation is repeated once to respectively obtain samarium-rich phase rapid hardening flail sheet SmCo4.3Cobalt-rich phase rapid-hardening melt-spun sheet SmCo4.6(ii) a The rotating speed of a copper roller of the vacuum rapid hardening melt-spun furnace is 47 r/min; the thickness of the throwing piece is 0.3 mm;
secondly, coarse crushing; rapidly solidifying samarium-rich phase to obtain SmCo melt spun sheet4.3Cobalt-rich phase rapid-hardening melt-spun sheet SmCo4.6Respectively putting the powder into a mortar, crushing the powder by using a punch, and sieving coarse crushed powder obtained by crushing to obtain samarium-rich phase alloy coarse powder and cobalt-rich phase alloy coarse powder; wherein the upper limit of the particle size range of the samarium-rich phase alloy coarse powder is 40 meshes, and the upper limit of the particle size range of the cobalt-rich phase alloy coarse powder is 50 meshes; the punching head of the punching machine is connected with a nitrogen pipe, and the nitrogen pipe introduces nitrogen into the mortar.
Thirdly, fine grinding to prepare powder; mixing the samarium-rich phase alloy coarse powder and the cobalt-rich phase alloy coarse powder according to the mass ratio of 1:2, and adding a grinding aid, wherein the grinding aid is zinc acetate, and the adding mass of the zinc acetate accounts for 0.05% of the total mass of the alloy coarse powder; crushing by using an airflow mill to finally obtain the powder with the weight ratio of 1:5 samarium cobalt magnetic powder;
fourthly, pressing and forming; mixing the raw materials of 1: pressing and molding the 5 samarium cobalt magnetic powder by a molding press, wherein the molding magnetic field is 2.0T, and the isostatic pressure is 250MPa to obtain a molded blank;
fifthly, sintering; placing the formed blank in a container in a sintering furnace, vacuumizing the container, filling inert gas, namely argon in the example, heating to 1165 ℃, sintering, preserving heat for 1.1 h, slowly cooling to 900 ℃, preserving heat for 2h, and rapidly cooling to room temperature to obtain a final finished product.
Example 2
Firstly, smelting and quickly solidifying and throwing slices; SmCo according to the chemical formula4.3Weighing a certain amount of samarium metal with the purity of 99.95 percent and electrolytic cobalt with the purity of 99.98 percent into a vacuum rapid hardening melt-spun furnace according to the mixture ratio; vacuumizing, heating, controlling the smelting temperature to be 1600 +/-5 ℃, and refining the materials for 3min and then casting; then SmCo is added4.6The operation is repeated once to respectively obtain samarium-rich phase rapid hardening flail sheet SmCo4.3Cobalt-rich phase rapid-hardening melt-spun sheet SmCo4.6(ii) a The rotating speed of a copper roller of the vacuum rapid hardening melt-spun furnace is 37 r/min; the thickness of the throwing piece is 0.22 mm;
secondly, coarse crushing; rapidly solidifying samarium-rich phase to obtain SmCo melt spun sheet4.3Cobalt-rich phase rapid-hardening melt-spun sheet SmCo4.6Respectively putting the powder into a mortar, crushing the powder by using a punch, and sieving coarse crushed powder obtained by crushing to obtain samarium-rich phase alloy coarse powder and cobalt-rich phase alloy coarse powder; wherein the upper limit of the particle size range of the samarium-rich phase alloy coarse powder is 30 meshes, and the upper limit of the particle size range of the cobalt-rich phase alloy coarse powder is 40 meshes; the punching head of the punching machine is connected with a nitrogen pipe, and the nitrogen pipe introduces nitrogen into the mortar.
Thirdly, fine grinding to prepare powder; mixing the samarium-rich phase alloy coarse powder and the cobalt-rich phase alloy coarse powder according to the mass ratio of 1:1, and simultaneously adding a grinding aid, wherein the grinding aid is aviation oil, and the adding mass of the aviation oil accounts for 0.05% of the total mass of the alloy coarse powder; crushing by using an airflow mill to finally obtain the powder with the weight ratio of 1:5 samarium cobalt magnetic powder;
fourthly, pressing and forming; mixing the raw materials of 1: pressing and molding the 5 samarium cobalt magnetic powder by a molding press, wherein the molding magnetic field is 1.8T, and the isostatic pressure is 250MPa to obtain a molded blank;
fifthly, sintering; and (3) placing the formed blank into a container of a sintering furnace, vacuumizing the container, filling inert gas, namely argon in the example, heating to 1160 ℃, sintering and preserving heat for 1 h, slowly cooling to 850 ℃ after sintering, preserving heat for 2h, and rapidly cooling to room temperature to obtain a final finished product.
Example 3
Firstly, smelting and quickly solidifying and throwing slices; SmCo according to the chemical formula4.3Respectively weighing a certain amount of samarium metal with the purity of 99.95 percent and electrolytic cobalt with the purity of 99.98 percent into a vacuum rapid hardening melt-spun furnace according to the mixture ratio; vacuumizing, heating, controlling the smelting temperature to be 1600 +/-5 ℃, and refining the materials for 3min and then casting; then SmCo is added4.6The operation is repeated once to respectively obtain samarium-rich phase rapid hardening flail sheet SmCo4.3Cobalt-rich phase rapid-hardening melt-spun sheet SmCo4.6(ii) a The rotating speed of a copper roller of the vacuum rapid hardening melt-spun furnace is 57 r/min; the thickness of the throwing piece is 0.15 mm;
secondly, coarse crushing; rapidly solidifying samarium-rich phase to obtain SmCo melt spun sheet4.3Cobalt-rich phase rapid-hardening melt-spun sheet SmCo4.6Respectively putting the powder into a mortar, crushing the powder by using a punch, and sieving coarse crushed powder obtained by crushing to obtain samarium-rich phase alloy coarse powder and cobalt-rich phase alloy coarse powder; wherein the upper limit of the particle size range of the samarium-rich phase alloy coarse powder is 30 meshes, and the upper limit of the particle size range of the cobalt-rich phase alloy coarse powder is 60 meshes; the punching head of the punching machine is connected with a nitrogen pipe, and the nitrogen pipe introduces nitrogen into the mortar.
Thirdly, fine grinding to prepare powder; mixing the samarium-rich phase alloy coarse powder and the cobalt-rich phase alloy coarse powder according to the mass ratio of 1:1, and adding a grinding aid, wherein the grinding aid is zinc acetate, and the adding mass of the zinc acetate accounts for 0.05% of the total mass of the alloy coarse powder; crushing by using an airflow mill to finally obtain the powder with the weight ratio of 1:5 samarium cobalt magnetic powder;
fourthly, pressing and forming; mixing the raw materials of 1: pressing and molding the 5 samarium cobalt magnetic powder by a molding press, wherein the molding magnetic field is 2.2T, and the isostatic pressure is 250MPa to obtain a molded blank;
fifthly, sintering; and (3) placing the formed blank into a container of a sintering furnace, vacuumizing the container, filling inert gas into the container, heating to 1165 ℃, sintering and preserving heat for 0.7 h, slowly cooling to 950 ℃, preserving heat for 2h, and rapidly cooling to room temperature to obtain a final finished product.
Comparative example 1
In the second step, the upper limit of the particle size range of the crushed samarium-rich phase alloy coarse powder and cobalt-rich phase alloy coarse powder is 40 meshes. The same as in example 1.
Comparative example 2
In the second step, the upper limit of the particle size range of the crushed samarium-rich phase alloy coarse powder is 50 meshes, and the upper limit of the particle size range of the cobalt-rich phase alloy coarse powder is 40 meshes. The same as in example 1.
Comparative example 3
In the second step, the upper limit of the particle size range of the crushed samarium-rich phase alloy coarse powder and cobalt-rich phase alloy coarse powder is 40 meshes, and the crushed samarium-rich phase alloy coarse powder and cobalt-rich phase alloy coarse powder are subjected to airflow milling respectively, airflow milled powder is uniformly mixed, and then the mixture is pressed and sintered to prepare the magnet. The same as in example 1.
Comparative example 4
In the first step, the ratio of samarium and cobalt is a single phase, namely, the precise ratio is adopted once, and the component ratio is consistent with that of the final product in the embodiment 1. The same as in example 1.
Table 1 performance test results of magnets of different embodiments
| Remanence (KG) | Intrinsic coercivity (KOe) | Maximum magnetic energy product (MGOe) | Hk（KOe） | Magnet Density (g/cm 3) | |
| Comparative example 1 | 8.81 | 20.94 | 19.08 | 14.32 | 7.78 |
| Comparative example 2 | 8.06 | ＞26.08 | 16.07 | 12.66 | 7.96 |
| Comparative example 3 | 9.13 | 11.09 | 20.04 | 8.27 | 7.56 |
| Comparative example 4 | 8.45 | 25.85 | 17.20 | 15.52 | 7.88 |
| Example 1 | 9.22 | 21.53 | 21.75 | 15.83 | 8.15 |
| Example 2 | 8.79 | 23.78 | 19.97 | 16.18 | 8.05 |
| Example 3 | 8.94 | 23.24 | 19.83 | 13.02 | 8.09 |
From the data, the method combining the granularity regulation and the coupling effect adopted by combining the chemical and physical characteristics of the pure samarium cobalt has the advantages that compared with the pure samarium cobalt sintering with a single component, the density of the magnet is effectively improved, and the magnetic performance is more excellent. Meanwhile, compared with fine powder mixing, the process has a remarkable effect on oxygen content control, and the obtained magnet has excellent coercive force. The whole preparation process has short working hours and low equipment requirement, thereby having good application prospect. .
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and the scope of the method for manufacturing a high-resistivity samarium cobalt magnet provided by the present invention should be subject to the claims.
Claims (10)
1. A preparation method of a high-magnetic-performance 1:5 pure samarium cobalt permanent magnet comprises the following steps:
firstly, smelting and quickly solidifying and throwing slices; weighing a certain amount of high-purity metal samarium and metal cobalt and putting the high-purity metal samarium and the metal cobalt into a vacuum rapid hardening melt-spun furnace; vacuumizing, heating, controlling the smelting temperature, and casting after refining the materials; repeating the operation once according to different samarium-cobalt ratios to respectively obtain samarium-rich phase rapid-solidification flail plates SmCoxCobalt-rich phase rapid-hardening melt-spun sheet SmCoy，x＜y；
Secondly, coarse crushing; rapidly solidifying samarium-rich phase to obtain SmCo melt spun sheetxCobalt-rich phase rapid-hardening melt-spun sheet SmCoyRespectively putting the powder into a mortar, crushing the powder by using a punch, and sieving coarse crushed powder obtained by crushing to obtain samarium-rich phase alloy coarse powder and cobalt-rich phase alloy coarse powder;
thirdly, fine grinding to prepare powder; mixing the two alloy coarse powders according to a proper proportion, and crushing by using an airflow mill to finally obtain a mixture of 1:5 samarium cobalt magnetic powder;
fourthly, pressing and forming; mixing the raw materials of 1: pressing and molding the 5 samarium cobalt magnetic powder by a molding press to obtain a molded blank;
fifthly, sintering; and placing the formed blank in a sintering furnace, vacuumizing, filling inert gas, heating and sintering, slowly cooling to 900 +/-50 ℃ after sintering, preserving heat and aging, and quickly cooling to room temperature to obtain a final finished product.
2. The method for preparing the high-magnetic-property 1:5 pure samarium cobalt permanent magnet according to the claim 1, which is characterized in that in the step one, the rotating speed of a copper roller of a vacuum rapid hardening melt-spun furnace is 47 +/-10 r/min.
3. The method for preparing the high-magnetic-property 1:5 pure samarium cobalt permanent magnet according to claim 1, which is characterized in that in the first step, the thickness of the throwing piece is 0.15-0.3 mm.
4. The method for preparing high magnetic property 1:5 pure samarium cobalt permanent magnet according to claim 1, which is characterized in that in the first step, a samarium-rich phase rapid hardening melt-spun sheet SmCoxCobalt-rich phase rapid-hardening melt-spun sheet SmCoyIn the formula, x is more than or equal to 3.9 and less than or equal to y and less than or equal to 4.9, and y-x is less than or equal to 0.3.
5. The method for preparing the high-magnetic-property 1:5 pure samarium cobalt permanent magnet according to the claim 1 or 2, characterized in that in the second step, a nitrogen pipe is connected to the stamping head of the stamping machine, and the nitrogen pipe introduces nitrogen into the mortar.
6. The method for preparing the high-magnetic-property 1:5 pure samarium cobalt permanent magnet according to the claim 1 or 2, which is characterized in that a cooling device is arranged around the mortar in the second step.
7. The method for preparing the high magnetic performance 1:5 pure samarium cobalt permanent magnet according to the claim 1 or 2, characterized in that in the second step, the upper limit of the particle size range of the sieved cobalt-rich phase alloy coarse powder is smaller than that of the samarium-rich phase alloy coarse powder.
8. The preparation method of the high magnetic property 1:5 pure samarium cobalt permanent magnet according to the claim 1 or 2, characterized in that in the third step, a grinding aid is added when the two alloy coarse powders are mixed; the addition amount of the grinding aid is 0.05% of the total mixed mass of the alloy coarse powder.
9. The method for preparing the high-magnetic-property 1:5 pure samarium cobalt permanent magnet according to the claim 1 or 2, which is characterized in that in the fourth step, the forming magnetic field is 1.5-2.5T, and the isostatic pressure is 250 MPa.
10. The preparation method of the high-magnetic-property 1:5 pure samarium cobalt permanent magnet according to the claim 1 or 2, which is characterized in that in the fifth step, the sintering temperature is 1150-1170 ℃, and the aging heat preservation time is 2 h.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113851318A (en) * | 2021-08-26 | 2021-12-28 | 杭州永磁集团有限公司 | Preparation method of high-performance bonded magnetic steel assembly |
| CN113851318B (en) * | 2021-08-26 | 2024-06-11 | 杭州永磁集团有限公司 | Preparation method of high-performance bonded magnetic steel assembly |
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