Sintered samarium-cobalt magnet with high coercive force and high mechanical property and preparation method of sintered samarium-cobalt magnet

Abstract

The invention relates to a high-coercivity and high-mechanical property sintered samarium-cobalt magnet and a preparation method thereof, and belongs to the technical field of preparation of samarium-cobalt magnets. The preparation method of the samarium-cobalt magnet comprises the steps that Sm, Co, Fe, Cu and Zr are smelted according to the proportion, an alloy cast ingot is obtained, then the alloy cast ingot is subjected to crushing and jet milling, and samarium-cobalt alloy powder is obtained; the samarium cobalt alloy powder and FeCoNiCuTiAl high-entropy alloy powder are mixed, and mixed powder is obtained; pressing the mixed powder under a magnetic field to obtain a pressed blank, and performing cold isostatic pressing on the pressed blank to obtain a static pressed blank; sintering the static pressure blank to obtain a sintered blank; and carrying out heat treatment on the sintered blank to prepare the samarium-cobalt magnet. The bending strength of the obtained samarium-cobalt magnet is 130 MPa or above, and the coercive force of the obtained samarium-cobalt magnet is 37.0 kOe or above.

Description

A sintered samarium cobalt magnet with high coercivity and high mechanical properties and its preparation method Technical Field

[0001] This invention relates to the field of samarium-cobalt magnet preparation technology, and in particular to a sintered samarium-cobalt magnet with high coercivity and high mechanical properties and its preparation method. Background Technology

[0002] Samarium cobalt (SMC) permanent magnets of type 2:17 are high-performance rare-earth permanent magnet materials. With their high Curie temperature, excellent temperature stability, and good corrosion resistance, they occupy an irreplaceable position in extreme environment applications such as aerospace, precision instruments, and high-temperature permanent magnet motors. As technology continues to advance, the demand for permanent magnet materials is evolving towards "high temperature, high speed, high load, and high reliability." The application scenarios of SMC permanent magnets, especially in extreme environments, place stringent requirements on coercivity and mechanical properties.

[0003] Currently, the main research direction focuses on improving magnetic or mechanical properties individually, neglecting the coupling relationship between the two. This approach fails to meet the comprehensive requirements of high-end devices for both high coercivity and high mechanical performance. For example, in improving coercivity, methods mainly involve doping with rare earth elements (Gd or Ce) or transition metals (Zr or Ti) to optimize the phase structure, or controlling domain wall pinning sites through heat treatment processes. In improving mechanical performance, methods mainly involve adding binders and surface coatings.

[0004] In summary, none of the existing technologies have resolved the core contradiction between "improved mechanical properties and lost magnetic properties". Summary of the Invention

[0005] Based on the above analysis, the present invention aims to provide a sintered samarium cobalt magnet with high coercivity and high mechanical properties and its preparation method. The resulting 2:17 type samarium cobalt permanent magnet material not only has high coercivity, but also high bending strength.

[0006] On one hand, the present invention provides a method for preparing a sintered samarium cobalt magnet with high coercivity and high mechanical properties, comprising the following steps:

[0007] S1: Powder preparation: Sm, Co, Fe, Cu and Zr are smelted in proportion to obtain an alloy ingot, which is then crushed and air-jet milled to obtain samarium-cobalt alloy powder; S2: Powder mixing: The samarium-cobalt alloy powder is mixed with FeCoNiCuTiAl high-entropy alloy powder to obtain a mixed powder; S3: Pressing: The mixed powder is pressed under a magnetic field to obtain a pressed blank, which is then subjected to cold isostatic pressing to obtain a statically pressed blank; S4: Sintering: The statically pressed blank is sintered to obtain a sintered blank; S5: Heat treatment: The sintered blank is heat-treated to obtain a samarium-cobalt magnet.

[0008] Further, in step S1, Sm is 24~27% wt.%, Co is 47.5~50.8 wt.%, Fe is 16~19 wt.%, Cu is 4~5.5 wt.%, and Zr is 2~3 wt.%.

[0009] Furthermore, the samarium-cobalt alloy powder has a particle size of 4~7μm.

[0010] Further, in step S2, the mass ratio of the samarium cobalt alloy powder to the FeCoNiCuTiAl high-entropy alloy powder is (99~99.9):(1~0.1).

[0011] Furthermore, the chemical composition of the FeCoNiCuTiAl high-entropy alloy powder includes: Fe: 15~21 wt.%, Co: 16~20 wt.%, Ni: 16~20 wt.%, Cu: 17~22 wt.%, Ti: 12~17 wt.%, Al: 5~10 wt.%.

[0012] Furthermore, in step S3, the strength of the magnetic field is 1.5~2.5T, and the pressure of the cold isostatic pressing is 200~300MPa.

[0013] Furthermore, in step S4, the sintering temperature is 1200~1250℃, and the sintering time is 1~4 hours.

[0014] Further, in step S5, the heat treatment includes solution treatment and aging treatment; the temperature of the solution treatment is 1150~1190℃, and the time of the solution treatment is 2~6 hours; the temperature of the aging treatment is 810~860℃, and the time of the aging treatment is 12~24 hours.

[0015] Furthermore, the obtained samarium cobalt magnet has a bending strength of over 130 MPa and a coercivity of over 37.0 kOe.

[0016] On the other hand, the present invention provides a sintered samarium cobalt magnet with high coercivity and high mechanical properties, which is obtained by the preparation method described in the present invention.

[0017] Compared with existing technologies, this invention achieves at least one of the following beneficial effects: 1. This invention targets 2:17 type samarium cobalt permanent magnet materials, combining them with FeCoNiCuTiAl high-entropy alloys, and then pressing, sintering, and heat-treating to obtain 2:17 type samarium cobalt magnets. The FeCoNiCuTiAl high-entropy alloy forms a dispersed phase in the samarium cobalt alloy, introducing a second phase pinning that works synergistically with the original cell wall pinning to improve coercivity. Furthermore, as a heterogeneous nucleation core, it refines the samarium cobalt grains, enhances the matrix strength and toughness, absorbs some stress, reduces stress concentration, and improves the mechanical properties of the samarium cobalt material. The resulting samarium cobalt magnet has a bending strength of over 130 MPa and a coercivity of over 37.0 kOe.

[0018] 2. In this invention, FeCoNiCuTiAl high-entropy alloy is added to the 2:17 type samarium cobalt permanent magnet material and the mass ratio of the two is controlled to be (99~99.9):(1~0.1). The mutual coordination of the components in the FeCoNiCuTiAl high-entropy alloy effectively solves the contradiction between "improvement of mechanical properties and loss of magnetic properties" in the traditional method.

[0019] In this invention, the above-described technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of this invention will be set forth in the following description, and some advantages may become apparent from the description or be learned by practicing the invention. The objects and other advantages of this invention can be realized and obtained from what is particularly pointed out in the description and drawings. Attached Figure Description

[0020] The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts.

[0021] Figure 1 is an elemental distribution detection diagram of the magnet obtained in Comparative Example 1; Figure 2 is an elemental distribution detection diagram of the magnet obtained in Example 1. Detailed Implementation

[0022] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0023] Samarium cobalt (SMC) permanent magnets of type 2:17 are high-performance rare-earth permanent magnet materials. With their high Curie temperature, excellent temperature stability, and good corrosion resistance, they occupy an irreplaceable position in extreme environment applications such as aerospace, precision instruments, and high-temperature permanent magnet motors. As technology continues to advance, the demand for permanent magnet materials is evolving towards "high temperature, high speed, high load, and high reliability." The application scenarios of SMC permanent magnets, especially in extreme environments, place stringent requirements on coercivity and mechanical properties.

[0024] Currently, the main research direction focuses on improving magnetic or mechanical properties individually, neglecting the coupling relationship between the two. This fails to meet the comprehensive requirements of high-end devices for both high coercivity and high mechanical performance. For example, in improving coercivity, methods mainly include doping with rare earth elements (Gd or Ce) or transition metals (Zr or Ti) to optimize the phase structure, or controlling domain wall pinning sites through heat treatment processes. In improving mechanical performance, methods mainly involve adding binders and surface coatings.

[0025] Therefore, this invention provides a method for preparing a sintered samarium cobalt magnet with high coercivity and high mechanical properties, comprising the following steps: S1: Powder preparation, Sm, Co, Fe, Cu and Zr are smelted in proportion to obtain an alloy ingot, and then the alloy ingot is crushed and air jet milled to obtain samarium cobalt alloy powder; S2: Powder mixing, the samarium cobalt alloy powder is mixed with FeCoNiCuTiAl high-entropy alloy powder to obtain a mixed powder; S3: Pressing, the mixed powder is pressed under a magnetic field to obtain a pressed blank, and then the pressed blank is subjected to cold isostatic pressing to obtain a statically pressed blank; S4: Sintering, the statically pressed blank is sintered to obtain a sintered blank; S5: Heat treatment, the sintered blank is heat treated to obtain a samarium cobalt magnet.

[0026] Compared with existing technologies, this invention targets 2:17 type samarium cobalt permanent magnet materials. It combines samarium cobalt with a FeCoNiCuTiAl high-entropy alloy, and after pressing, sintering, and heat treatment, produces 2:17 type samarium cobalt magnets. The FeCoNiCuTiAl high-entropy alloy forms a dispersed phase in the samarium cobalt alloy, introducing a second phase pinning that synergistically enhances coercivity with the original cell wall pinning. Furthermore, as a heterogeneous nucleation core, it refines the samarium cobalt grains, enhances the matrix strength and toughness, absorbs some stress, reduces stress concentration, and improves the mechanical properties of the samarium cobalt material. The resulting samarium cobalt magnet has a bending strength exceeding 130 MPa and a coercivity exceeding 37.0 kOe.

[0027] Specifically, in step S1, Sm is 24~27% wt.%, Co is 47.5~50.8 wt.%, Fe is 16~19 wt.%, Cu is 4~5.5 wt.%, and Zr is 2~3 wt.%.

[0028] Specifically, the samarium-cobalt alloy powder has a particle size of 4~7μm.

[0029] It should be noted that in this invention, the particle size of the samarium-cobalt alloy powder is controlled to be 4~7μm. If the particle size is too fine, the powder is easily oxidized, has poor flowability, and is difficult to form; while if the particle size is too coarse, it will reduce the magnetic properties and make orientation operations difficult.

[0030] Therefore, selecting samarium-cobalt alloy powder with a particle size range of 4-7 μm can ensure both good magnetic properties and formability of the magnet. This particle size range avoids oxidation and flowability problems caused by excessively fine powder, and also avoids damage to the orientation and magnetic properties of the magnet by excessively coarse powder.

[0031] Specifically, in step S2, the mass ratio of the samarium cobalt alloy powder to the FeCoNiCuTiAl high-entropy alloy powder is (99~99.9):(1~0.1).

[0032] It should be noted that this invention mixes FeCoNiCuTiAl high-entropy alloy powder with samarium cobalt alloy powder, which not only improves the magnetic properties of samarium cobalt magnets but also enhances their mechanical properties, such as bending strength. This invention controls the doping amount of FeCoNiCuTiAl high-entropy alloy powder to within 1%. Excessive doping can easily reduce the proportion of the main phase, deteriorating both magnetic and mechanical properties.

[0033] Specifically, the chemical composition of FeCoNiCuTiAl high-entropy alloy powder includes: Fe: 15~21 wt.%, Co: 16~20 wt.%, Ni: 16~20 wt.%, Cu: 17~22 wt.%, Ti: 12~17 wt.%, Al: 5~10 wt.%.

[0034] It should be noted that the FeCoNiCuTiAl high-entropy alloy forms a dispersed phase in the samarium-cobalt alloy, introducing a second-phase pinning effect that synergizes with the original cell wall pinning to improve coercivity. Furthermore, as a heterogeneous nucleation core, it can refine the samarium-cobalt grains, enhance the matrix strength and toughness, while absorbing some stress, reducing stress concentration, and improving the mechanical properties of samarium-cobalt materials.

[0035] The introduction of Fe can increase saturation magnetization and remanence.

[0036] Co is the core constituent element of the samarium-cobalt main phase, forming a 2:17 type basic metal compound with samarium.

[0037] Ni elements are distributed at grain boundaries and act as pinning agents. They also form trace amounts of rare earth nickel compounds with a small amount of Sm, which can inhibit the abnormal growth of the main phase grains.

[0038] Cu and Sm form a Cu-rich cell wall phase, which helps to improve coercivity.

[0039] Ti and Al elements interact with Sm and Co, with Al dispersed in the main phase and Ti dispersed in the matrix, thereby improving mechanical properties.

[0040] Specifically, in step S3, the magnetic field strength is 1.5~2.5T, and the cold isostatic pressure is 200~300MPa.

[0041] In this invention, the strength of the magnetic field can be 1.5T, 1.6T, 1.7T, 1.8T, 1.9T, 2.0T, 2.1T, 2.2T, 2.3T, 2.4T or 2.5T.

[0042] In this invention, the pressure of cold isostatic pressing can be 200MPa, 210MPa, 220MPa, 230MPa, 240MPa, 250MPa, 260MPa, 270MPa, 280MPa, 290MPa or 300MPa.

[0043] Specifically, in step S4, the sintering temperature is 1200~1250℃, and the sintering time is 1~4 hours.

[0044] It should be noted that in this invention, the samarium cobalt alloy powder and FeCoNiCuTiAl high-entropy alloy powder need to be pressed, sintered, and heat-treated after mixing. During the sintering stage, the sintering temperature and time need to be controlled. If the sintering temperature is too high, abnormal growth of the main phase grains will occur, resulting in over-liquid phase sintering, which in turn leads to deterioration of magnetic and mechanical properties. If the sintering time is too long, the magnet will experience uneven segregation, destroying the normal cellular structure, which will also lead to deterioration of magnetic and mechanical properties. Simultaneously, excessively high temperatures and excessively long times will cause the magnet to bulge and crack, causing irreversible damage.

[0045] Therefore, the sintering temperature in this invention can be 1200℃, 1210℃, 1220℃, 1230℃, 1240℃, or 1250℃. The sintering time can be 1 hour, 1.5 hours, 2 hours, 2.5 hours, 3 hours, 3.5 hours, or 4 hours.

[0046] Specifically, in step S5, the heat treatment includes solution treatment and aging treatment; the temperature of the solution treatment is 1150~1190℃, and the time of the solution treatment is 2~6 hours; the temperature of the aging treatment is 810~860℃, and the time of the aging treatment is 12~24 hours.

[0047] It should be noted that after sintering, heat treatment is required in this invention. The heat treatment includes solution treatment and aging treatment, and the temperature and time of solution treatment and aging treatment need to be controlled.

[0048] If the solution treatment temperature is too high, approaching the sintering temperature, it is equivalent to secondary sintering, causing the grains to grow a second time. Subsequent aging cannot refine the grains, resulting in coarse grains and deteriorating magnetic and mechanical properties. Therefore, the solution treatment temperature can be 1150℃, 1155℃, 1160℃, 1165℃, 1170℃, 1175℃, 1180℃, 1185℃, or 1190℃.

[0049] If the solution treatment time is too long, it can easily lead to grain coarsening, damage the hard magnetization structure, and also deteriorate the magnetic and mechanical properties. Therefore, the solution treatment time can be 2 hours, 2.5 hours, 3 hours, 3.5 hours, 4 hours, 4.5 hours, 5 hours, 5.5 hours, or 6 hours.

[0050] If the aging temperature is too high, the Cu-rich cell wall phase tends to coarsen, weakening the pinning effect. If the aging time is too long, the cell wall phase grows excessively, destroying the cellular structure. Both excessively high aging temperatures and excessively long aging times will deteriorate the magnetic and mechanical properties.

[0051] Therefore, the aging treatment temperature of the present invention can be 810℃, 815℃, 820℃, 825℃, 830℃, 835℃, 840℃, 845℃, 850℃, 855℃ or 860℃; the aging treatment time can be 12 hours, 13 hours, 14 hours, 15 hours, 16 hours, 17 hours, 18 hours, 19 hours, 20 hours, 21 hours, 22 hours, 23 hours or 24 hours.

[0052] This invention provides a sintered samarium cobalt magnet with high coercivity and high mechanical properties, obtained by the preparation method described in this invention. The samarium cobalt alloy powder is mixed with FeCoNiCuTiAl high-entropy alloy powder, and then pressed, sintered, and heat-treated to obtain the samarium cobalt magnet. The resulting 2:17 type samarium cobalt permanent magnet material not only has high coercivity but also high bending strength. The bending strength of the obtained samarium cobalt magnet is above 130 MPa, and the coercivity is above 37.0 kOe.

[0053] To more clearly describe the present invention, the following embodiments and comparative examples are provided for further illustration.

[0054] Example 1: The preparation method of samarium cobalt magnet includes the following steps: S1: powder preparation, 2: the composition of the 17-type samarium cobalt magnet includes: Sm 26.1 wt.%, Co 49.8 wt.%, Fe 16.3 wt.%, Cu 4.8 wt.%, Zr 3 wt.%. Sm, Co, Fe, Cu, and Zr were smelted in a specific ratio to obtain an alloy ingot. The alloy ingot was then crushed and subjected to an air jet mill to obtain samarium-cobalt alloy powder with a particle size of 6.2 μm. S2: Powder mixing. The samarium-cobalt alloy powder was mixed with FeCoNiCuTiAl high-entropy alloy powder at a mass ratio of 99.9:0.1 in a double-cone three-dimensional motion mixer for 6 hours to obtain a mixed powder. The FeCoNiCuTiAl high-entropy alloy powder composition was: Fe: 17.91 wt.%, Co: 18.9 wt.%, Ni: 18.82 wt.%, Cu: 20.38 wt.%, Al: 8.65 wt.%, Ti: 15.34 wt.%. wt.%; S3: Pressing, pressing the mixed powder under a 1.7T magnetic field to obtain a pressed blank, and then cold isostatic pressing the pressed blank at 280MPa to obtain a statically pressed blank; S4: Sintering, sintering the statically pressed blank at a sintering temperature of 1200℃ for 2 hours to obtain a sintered blank; S5: Heat treatment, heat treating the sintered blank, including solution treatment and aging treatment; the solution treatment temperature is 1175℃ and the solution treatment time is 3 hours; the aging treatment temperature is 820℃ and the aging treatment time is 20 hours to obtain a samarium cobalt magnet.

[0055] Example 2 The preparation process of Example 2 is largely the same as that of Example 1, except that the mass ratio of samarium cobalt alloy powder to FeCoNiCuTiAl high-entropy alloy powder in Example 2 is 99.7:0.3.

[0056] Example 3 and Example 2 are prepared in a similar manner to Example 1, except that in Example 2, the mass ratio of samarium cobalt alloy powder to FeCoNiCuTiAl high-entropy alloy powder is 99.5:0.5.

[0057] Example 4 and Example 3 are prepared in a similar manner to Example 1, except that the mass ratio of samarium cobalt alloy powder to FeCoNiCuTiAl high-entropy alloy powder is 99.0:1.0 in Example 3.

[0058] Example 5 The preparation process of Example 5 is largely the same as that of Example 1, except that the FeCoNiCuTiAl high-entropy alloy powder in Example 5 has the following composition: Fe: 16.78 wt.%, Co: 18.9 wt.%, Ni: 18.82 wt.%, Cu: 21.51 wt.%, Al: 8.65 wt.%, Ti: 15.34 wt.%.

[0059] Example 6 The preparation process of Example 6 is largely the same as that of Example 1, except that the FeCoNiCuTiAl high-entropy alloy powder in Example 6 has the following composition: Fe: 15.62 wt.%, Co: 18.9 wt.%, Ni: 18.82 wt.%, Cu: 22.67 wt.%, Al: 8.65 wt.%, Ti: 15.34 wt.%.

[0060] Example 7: The preparation process of Example 7 is largely the same as that of Example 1, except that the sintering temperature in Example 7 is 1240℃ and the sintering time is 2 hours to obtain a sintered blank; heat treatment is performed on the sintered blank, which includes solution treatment and aging treatment; the solution treatment temperature is 1170℃ and the solution treatment time is 3 hours; the aging treatment temperature is 810℃ and the aging treatment time is 20 hours to obtain a samarium cobalt magnet.

[0061] Comparative Example 1: The preparation process of Comparative Example 1 is largely the same as that of Example 1, except that Comparative Example 1 does not contain FeCoNiCuTiAl high-entropy alloy powder.

[0062] Comparative Example 2 was prepared in a similar manner to Example 1, except that the mass ratio of samarium cobalt alloy powder to FeCoNiCuTiAl high-entropy alloy powder was 98.5:1.5.

[0063] Comparative Example 3 was prepared in a similar manner to Example 1, except that the composition of the high-entropy alloy powder in Comparative Example 3 was: Al: 13wt%, Mg: 11.7wt%, Zn: 31.4wt%, Cu: 30.5wt%, Si: 13.4wt%.

[0064] Comparative Example 4 was prepared in a similar manner to Example 1, except that the composition of the FeCoNiCuTiAl high-entropy alloy powder in Comparative Example 4 was as follows: Fe: 13.8 wt.%, Co: 21.2 wt.%, Ni: 15.4 wt.%, Cu: 16.89 wt.%, Al: 11.2 wt.%, Ti: 21.51 wt.%.

[0065] Comparative Example 5 was prepared in a manner similar to that of Example 1, except that the composition of the FeCoNiCuTiAl high-entropy alloy powder in Comparative Example 5 was as follows: Fe: 20.96 wt.%, Co: 19.64 wt.%, Ni: 19.75 wt.%, Cu: 21.57 wt.%, Al: 18.08 wt.%.

[0066] Comparative Example 6 was prepared in a similar manner to Example 1, except that the sintering temperature in Comparative Example 6 was 1260°C.

[0067] Comparative Example 7 was prepared in a similar manner to Example 1, except that the solution treatment temperature in Comparative Example 7 was 1200°C.

[0068] Comparative Example 8 was prepared in a similar manner to Example 1, except that the aging treatment temperature in Comparative Example 8 was 880°C.

[0069] The performance tests were conducted on the above embodiments and comparative examples, mainly including remanence, coercivity, magnetic energy product and bending strength. The test results are shown in Table 1.

[0070] Table 1 Performance Test Results

[0071] As can be seen from Examples 1-7 and Comparative Examples 1-8, and with reference to Table 1 and Figures 1-2, the invention targets 2:17 type samarium cobalt permanent magnet materials. It combines these materials with a FeCoNiCuTiAl high-entropy alloy, followed by pressing, sintering, and heat treatment to produce 2:17 type samarium cobalt magnets. The resulting samarium cobalt magnets exhibit a bending strength exceeding 130 MPa and a coercivity exceeding 37.0 kOe.

[0072] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for preparing a sintered samarium cobalt magnet with high coercivity and high mechanical properties, characterized in that, Includes the following steps: S1: Powder preparation: Sm, Co, Fe, Cu and Zr are smelted in proportion to obtain an alloy ingot, which is then crushed and air-jet milled to obtain samarium-cobalt alloy powder; S2: Powder mixing: The samarium-cobalt alloy powder is mixed with FeCoNiCuTiAl high-entropy alloy powder to obtain a mixed powder; S3: Pressing: The mixed powder is pressed under a magnetic field to obtain a pressed billet, which is then subjected to cold isostatic pressing to obtain a statically pressed billet; S4: Sintering, the statically pressed blank is sintered to obtain a sintered blank; S5: Heat treatment, the sintered blank is heat treated to obtain a samarium cobalt magnet.

2. The method for preparing a sintered samarium cobalt magnet with high coercivity and high mechanical properties according to claim 1, characterized in that, In step S1, Sm is 24~27% wt.%, Co is 47.5~50.8 wt.%, Fe is 16~19 wt.%, Cu is 4~5.5 wt.%, and Zr is 2~3 wt.%.

3. The method for preparing a sintered samarium cobalt magnet with high coercivity and high mechanical properties according to claim 1, characterized in that, The samarium-cobalt alloy powder has a particle size of 4~7μm.

4. The method for preparing a sintered samarium cobalt magnet with high coercivity and high mechanical properties according to claim 1, characterized in that, In step S2, the mass ratio of the samarium cobalt alloy powder to the FeCoNiCuTiAl high-entropy alloy powder is (99~99.9):(1~0.1).

5. The method for preparing a sintered samarium cobalt magnet with high coercivity and high mechanical properties according to claim 1, characterized in that, The chemical composition of FeCoNiCuTiAl high-entropy alloy powder includes: Fe: 15~21 wt.%, Co: 16~20 wt.%, Ni: 16~20 wt.%, Cu: 17~22 wt.%, Ti: 12~17 wt.%, Al: 5~10 wt.%.

6. The method for preparing a sintered samarium cobalt magnet with high coercivity and high mechanical properties according to claim 1, characterized in that, In step S3, the magnetic field strength is 1.5~2.5T, and the cold isostatic pressure is 200~300MPa.

7. The method for preparing a sintered samarium cobalt magnet with high coercivity and high mechanical properties according to claim 1, characterized in that, In step S4, the sintering temperature is 1200~1250℃, and the sintering time is 1~4 hours.

8. The method for preparing a sintered samarium cobalt magnet with high coercivity and high mechanical properties according to claim 1, characterized in that, In step S5, the heat treatment includes solution treatment and aging treatment; the solution treatment temperature is 1150~1190℃, and the solution treatment time is 2~6 hours; the aging treatment temperature is 810~860℃, and the aging treatment time is 12~24 hours.

9. The method for preparing a sintered samarium cobalt magnet with high coercivity and high mechanical properties according to claim 1, characterized in that, The obtained samarium cobalt magnet has a bending strength of over 130 MPa and a coercivity of over 37.0 kOe.

10. A sintered samarium cobalt magnet with high coercivity and high mechanical properties, characterized in that, Obtained by the preparation method according to any one of claims 1-9.

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