CN111952034A - High-temperature-resistant high-thermal-conductivity sintered neodymium-iron-boron permanent magnet and preparation method thereof - Google Patents
High-temperature-resistant high-thermal-conductivity sintered neodymium-iron-boron permanent magnet and preparation method thereof Download PDFInfo
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- 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
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- H01F1/053—Alloys characterised by their composition containing rare earth metals
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- 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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- C08K2003/385—Binary compounds of nitrogen with boron
Abstract
The invention discloses a high-temperature-resistant high-heat-conduction sintered neodymium-iron-boron permanent magnet and a preparation method thereof, wherein the permanent magnet comprises a main body, a plurality of radiating cores and a radiating coating; the upper and lower surfaces of the main body are penetrated and formed with a plurality of through holes, and the main body comprises the following raw materials in parts by weight: 150 parts of 120-iron, 25-28 parts of Nd, 7-8 parts of Pr, 8-10 parts of Sm, 3-5 parts of Gd, 5-7 parts of La, 3-4 parts of Co, 2-3 parts of B, 1-2 parts of Al, 0.2-0.5 part of Zr, 2-5 parts of antioxidant, 10-15 parts of carbon nano-tubes and 5-6 parts of aluminum nano-powder. The main body is prepared by adopting the formula, the temperature resistance of the sintered permanent magnet is improved by utilizing the characteristic that Sm element can improve the temperature resistance of the magnet, and the heat-conducting performance of the sintered permanent magnet is effectively improved by arranging a plurality of heat-radiating cores and a heat-radiating coating which are prepared by adopting the formula of the invention in a matching way, the self-heat-radiating performance is very good, heat can not be accumulated, and the normal operation of equipment is facilitated.
Description
Technical Field
The invention relates to the technical field of neodymium iron boron, in particular to a high-temperature-resistant high-heat-conduction sintered neodymium iron boron permanent magnet and a preparation method thereof.
Background
The sintered Nd-Fe-B permanent magnet is a permanent magnet with the strongest magnetism in the present generation, and becomes a rare earth permanent magnet material with the largest use amount due to the excellent characteristics of high magnetic energy product, high cost performance and the like, and is widely applied to a plurality of fields of electronic information, automobile industry, medical equipment, energy transportation and the like. With the rapid development of these fields, the service conditions of the sintered nd-fe-b magnet are becoming more and more strict.
However, the conventional sintered ndfeb permanent magnet is generally not resistant to high temperature, and particularly has low heat conductivity and poor self-heat dissipation performance, which causes heat accumulation and is not favorable for normal operation of equipment. Therefore, there is a need to develop a solution to the above problems.
Disclosure of Invention
In view of the above, the present invention is directed to the defects in the prior art, and the main objective of the present invention is to provide a sintered ndfeb permanent magnet with high temperature resistance and high thermal conductivity and a preparation method thereof, which can effectively solve the problems that the conventional sintered ndfeb permanent magnet is not high temperature resistant and has relatively low thermal conductivity.
In order to achieve the purpose, the invention adopts the following technical scheme:
a sintered Nd-Fe-B permanent magnet with high temperature resistance and high heat conductivity comprises a main body, a plurality of radiating cores and a radiating coating;
the upper and lower surfaces of the main body are penetrated and formed with a plurality of through holes, and the main body comprises the following raw materials in parts by weight: 150 parts of Fe 120, 25-28 parts of Nd, 7-8 parts of Pr, 8-10 parts of Sm, 3-5 parts of Gd, 5-7 parts of La, 3-4 parts of Co, 2-3 parts of B, 1-2 parts of Al, 0.2-0.5 part of Zr, 2-5 parts of antioxidant, 10-15 parts of carbon nano-tubes and 5-6 parts of aluminum nano-powder;
the plurality of radiating cores are respectively embedded in the corresponding through holes and are sintered together with the main body, the two end faces of the radiating cores are respectively flush with the upper surface and the lower surface of the main body, and the radiating cores comprise the following raw materials in parts by weight: 50-60 parts of graphene nano powder, 10-15 parts of nano ceramic, 10-15 parts of nano silver powder and 10-15 parts of nano copper powder;
the heat dissipation coating is coated on the outer surface of the main body and covers two end surfaces of the heat dissipation core, and the heat dissipation coating is a modified graphene heat dissipation coating and comprises the following raw materials in parts by weight: 50-55 parts of flake graphene, 8-10 parts of flake boron nitride, 70-80 parts of organic silicon resin, 1-2 parts of curing agent, 3-4 parts of dispersing agent and 2-3 parts of flatting agent.
Preferably, the antioxidant is adipic acid dihydrazide.
Preferably, the main body comprises the following raw materials in parts by weight: 140 parts of Fe, 26 parts of Nd, 8 parts of Pr, 9 parts of Sm, 4 parts of Gd, 6 parts of La, 4 parts of Co, 3 parts of B, 2 parts of Al, 0.4 part of Zr, 4 parts of antioxidant, 13 parts of carbon nanotubes and 6 parts of aluminum nanopowder.
Preferably, the heat dissipation core comprises the following raw materials in parts by weight: 55 parts of graphene nano powder, 14 parts of nano ceramic, 13 parts of nano silver powder and 12 parts of nano copper powder.
Preferably, the modified graphene heat dissipation coating comprises the following raw materials in parts by weight: 52 parts of flake graphene, 9 parts of flake boron nitride, 75 parts of organic silicon resin, 2 parts of curing agent, 3 parts of dispersing agent and 3 parts of leveling agent.
A preparation method of a high-temperature-resistant high-heat-conductivity sintered neodymium-iron-boron permanent magnet comprises the following steps:
(1) taking raw materials Fe, Nd, Pr, Sm, Gd, La, Co, B, Al and Zr according to a proportion, smelting an ingot, carrying out heat treatment on the ingot, crushing the ingot after heat treatment by hydrogen explosion, absorbing hydrogen for dehydrogenation, and then milling by adopting an air flow mill to prepare neodymium iron boron alloy powder;
(2) proportionally mixing an antioxidant, a carbon nanotube and nano aluminum powder with the neodymium iron boron alloy powder prepared in the step (1) in a resonant mode, and uniformly mixing the antioxidant, the carbon nanotube, the nano aluminum powder and the neodymium iron boron alloy powder under the protection of vacuum or inert gas;
(3) placing the mixture obtained in the step (2) into a mold, orienting in a magnetic field, and profiling to form a first green body, wherein a plurality of through holes are formed in the first green body;
(4) putting the first green body into another die, taking the graphene nano powder, the nano ceramic, the nano silver powder and the nano copper powder according to a certain proportion, uniformly mixing the graphene nano powder, the nano ceramic, the nano silver powder and the nano copper powder in a resonant sound mode to form mixed powder, and then pressing the mixed powder into each through hole in a high-pressure mode to form a second green body;
(5) performing isostatic pressing treatment on the second green body, then performing discharge plasma sintering, and performing three-stage tempering heat treatment to obtain a semi-finished product so as to form a main body and a heat dissipation core;
(6) taking the flaky graphene, the flaky boron nitride, the organic silicon resin, the curing agent, the dispersing agent and the flatting agent according to the proportion, blending to form the modified graphene heat dissipation coating, then coating the modified graphene heat dissipation coating on the outer surface of the semi-finished product, and placing the semi-finished product in an oven to be cured to form a heat dissipation layer, thus obtaining the finished product.
Compared with the prior art, the invention has obvious advantages and beneficial effects, and specifically, the technical scheme includes that:
the main body is prepared by adopting the formula, the temperature resistance of the sintered permanent magnet is improved by utilizing the characteristic that Sm element can improve the temperature resistance of the magnet, and the heat-conducting performance of the sintered permanent magnet is effectively improved by arranging a plurality of heat-radiating cores and a heat-radiating coating which are prepared by adopting the formula of the invention in a matching way, the self-heat-radiating performance is very good, heat can not be accumulated, and the normal operation of equipment is facilitated.
To more clearly illustrate the structural features and effects of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments:
drawings
FIG. 1 is a cross-sectional view of a preferred embodiment of the present invention.
The attached drawings indicate the following:
10. main body 11, through hole
20. Heat dissipation core 30 and heat dissipation coating
Detailed Description
Referring to fig. 1, a specific structure of a sintered ndfeb permanent magnet with high temperature resistance and high thermal conductivity according to a preferred embodiment of the invention is shown, which includes a main body 10, a plurality of heat dissipation cores 20 and a heat dissipation coating 30.
The upper and lower surfaces of the main body 10 are formed with a plurality of through holes 11, and the main body 10 comprises the following raw materials in parts by weight: 150 parts of 120-iron, 25-28 parts of Nd, 7-8 parts of Pr, 8-10 parts of Sm, 3-5 parts of Gd, 5-7 parts of La, 3-4 parts of Co, 2-3 parts of B, 1-2 parts of Al, 0.2-0.5 part of Zr, 2-5 parts of antioxidant, 10-15 parts of carbon nano-tubes and 5-6 parts of aluminum nano-powder. The antioxidant is adipic acid dihydrazide.
The plurality of heat dissipation cores 20 are respectively embedded in the corresponding through holes 11 and sintered with the main body 10, two end faces of the heat dissipation cores 20 are respectively flush with the upper surface and the lower surface of the main body 10, and the heat dissipation cores 20 comprise the following raw materials in parts by weight: 50-60 parts of graphene nano powder, 10-15 parts of nano ceramic, 10-15 parts of nano silver powder and 10-15 parts of nano copper powder.
The heat dissipation coating 30 is coated on the outer surface of the main body 10 and covers the two end surfaces of the heat dissipation core 20, and the heat dissipation coating 30 is a modified graphene heat dissipation coating, and comprises the following raw materials in parts by weight: 50-55 parts of flake graphene, 8-10 parts of flake boron nitride, 70-80 parts of organic silicon resin, 1-2 parts of curing agent, 3-4 parts of dispersing agent and 2-3 parts of flatting agent.
The invention also discloses a preparation method of the high-temperature-resistant high-heat-conductivity sintered neodymium iron boron permanent magnet, which comprises the following steps:
(1) taking raw materials Fe, Nd, Pr, Sm, Gd, La, Co, B, Al and Zr according to a proportion, smelting an ingot, carrying out heat treatment on the ingot, crushing the ingot after heat treatment by hydrogen explosion, absorbing hydrogen for dehydrogenation, and then adopting an air current mill to prepare powder, thus obtaining the neodymium iron boron alloy powder, wherein the heat treatment temperature of the ingot is 680 ℃.
(2) And (2) proportionally mixing the antioxidant, the carbon nanotubes and the nano aluminum powder with the neodymium iron boron alloy powder prepared in the step (1) by resonance sound, and uniformly mixing the antioxidant, the carbon nanotubes, the nano aluminum powder and the neodymium iron boron alloy powder under the protection of vacuum or inert gas.
(3) And (3) putting the mixture obtained in the step (2) into a mold, orienting in a magnetic field, and pressing to form a first green body, wherein a plurality of through holes 11 are formed in the first green body.
(4) And putting the first green body into another die, taking the graphene nano powder, the nano ceramic, the nano silver powder and the nano copper powder according to the proportion, uniformly mixing the graphene nano powder, the nano ceramic, the nano silver powder and the nano copper powder by resonance sound to form mixed powder, and then pressing the mixed powder into each through hole 11 in a high-pressure mode to form a second green body.
(5) And carrying out discharge plasma sintering on the second green body after isostatic pressing treatment, and carrying out three-stage tempering heat treatment to obtain a semi-finished product so as to form the main body 10 and the radiating core 20, wherein the isostatic pressing treatment pressure is 250MPa, the treatment time is 80s, the temperature of the first-stage tempering heat treatment is 900 ℃, the heat preservation time is 2.5h, the temperature of the second-stage tempering heat treatment is 650 ℃, the heat preservation time is 2h, the temperature of the third-stage tempering heat treatment is 600 ℃, and the heat preservation time is 1.5 h.
(6) And mixing the flaky graphene, the flaky boron nitride, the organic silicon resin, the curing agent, the dispersing agent and the flatting agent according to the proportion to prepare a modified graphene heat dissipation coating, then coating the modified graphene heat dissipation coating on the outer surface of the semi-finished product, and placing the semi-finished product in an oven to be cured to form a heat dissipation layer 30, thus obtaining the finished product.
The invention is explained in more detail below in a number of examples:
example 1:
a specific structure of a sintered NdFeB permanent magnet with high temperature resistance and high heat conduction comprises a main body 10, a plurality of radiating cores 20 and a radiating coating 30.
The upper surface and the lower surface of the main body 10 are provided with a plurality of through holes 11 in a penetrating way, and the main body comprises the following raw materials in parts by weight: 140 parts of Fe, 26 parts of Nd, 8 parts of Pr, 9 parts of Sm, 4 parts of Gd, 6 parts of La, 4 parts of Co, 3 parts of B, 2 parts of Al, 0.4 part of Zr, 4 parts of antioxidant, 13 parts of carbon nanotubes and 6 parts of aluminum nanopowder. The antioxidant is adipic acid dihydrazide.
The plurality of radiating cores 20 are respectively embedded in the corresponding through holes 11 and sintered with the main body 10, the two end faces of the radiating cores 20 are respectively flush with the upper surface and the lower surface of the main body 10, and the radiating cores comprise the following raw materials in parts by weight: 55 parts of graphene nano powder, 14 parts of nano ceramic, 13 parts of nano silver powder and 12 parts of nano copper powder.
The heat dissipation coating 30 is coated on the outer surface of the main body 10 and covers the two end surfaces of the heat dissipation core 20, and the heat dissipation coating 30 is a modified graphene heat dissipation coating, and comprises the following raw materials in parts by weight: 52 parts of flake graphene, 9 parts of flake boron nitride, 75 parts of organic silicon resin, 2 parts of curing agent, 3 parts of dispersing agent and 3 parts of leveling agent.
A preparation method of a high-temperature-resistant high-heat-conductivity sintered neodymium-iron-boron permanent magnet comprises the following steps:
(1) taking raw materials Fe, Nd, Pr, Sm, Gd, La, Co, B, Al and Zr according to a proportion, smelting an ingot, carrying out heat treatment on the ingot, crushing the ingot after heat treatment by hydrogen explosion, absorbing hydrogen for dehydrogenation, and then adopting an air current mill to prepare powder, thus obtaining the neodymium iron boron alloy powder, wherein the heat treatment temperature of the ingot is 680 ℃.
(2) And (2) proportionally mixing the antioxidant, the carbon nanotubes and the nano aluminum powder with the neodymium iron boron alloy powder prepared in the step (1) by resonance sound, and uniformly mixing the antioxidant, the carbon nanotubes, the nano aluminum powder and the neodymium iron boron alloy powder under the protection of vacuum or inert gas.
(3) And (3) putting the mixture obtained in the step (2) into a mold, orienting in a magnetic field, and pressing to form a first green body, wherein a plurality of through holes 11 are formed in the first green body.
(4) And putting the first green body into another die, taking the graphene nano powder, the nano ceramic, the nano silver powder and the nano copper powder according to the proportion, uniformly mixing the graphene nano powder, the nano ceramic, the nano silver powder and the nano copper powder by resonance sound to form mixed powder, and then pressing the mixed powder into each through hole 11 in a high-pressure mode to form a second green body.
(5) And carrying out discharge plasma sintering on the second green body after isostatic pressing treatment, and carrying out three-stage tempering heat treatment to obtain a semi-finished product so as to form the main body 10 and the radiating core 20, wherein the isostatic pressing treatment pressure is 250MPa, the treatment time is 80s, the temperature of the first-stage tempering heat treatment is 900 ℃, the heat preservation time is 2.5h, the temperature of the second-stage tempering heat treatment is 650 ℃, the heat preservation time is 2h, the temperature of the third-stage tempering heat treatment is 600 ℃, and the heat preservation time is 1.5 h.
(6) And mixing the flaky graphene, the flaky boron nitride, the organic silicon resin, the curing agent, the dispersing agent and the flatting agent according to the proportion to prepare a modified graphene heat dissipation coating, then coating the modified graphene heat dissipation coating on the outer surface of the semi-finished product, and placing the semi-finished product in an oven to be cured to form a heat dissipation layer 30, thus obtaining the finished product.
Through tests, the heat conductivity coefficient of the high-temperature-resistant high-heat-conductivity sintered neodymium iron boron permanent magnet prepared by the embodiment reaches 1005W/mK, the high-temperature-resistant high-heat-conductivity sintered neodymium iron boron permanent magnet has good heat dissipation performance, the remanence temperature coefficient is-0.085, the coercive force temperature coefficient is-0.436, the remanence temperature coefficient and the coercive force temperature coefficient are both obviously improved, and the temperature resistance of the sintered permanent magnet is improved by utilizing the characteristic that Sm element can improve the temperature resistance of the magnet.
Example 2:
a specific structure of a sintered NdFeB permanent magnet with high temperature resistance and high heat conduction comprises a main body 10, a plurality of radiating cores 20 and a radiating coating 30.
The upper and lower surfaces of the main body 10 are formed with a plurality of through holes 11, and the main body 10 comprises the following raw materials in parts by weight: 120 parts of Fe, 25 parts of Nd, 7 parts of Pr, 8 parts of Sm, 3 parts of Gd, 5 parts of La, 3 parts of Co, 2 parts of B, 1 part of Al, 0.2 part of Zr, 2 parts of antioxidant, 10 parts of carbon nanotubes and 5 parts of aluminum nanopowder. The antioxidant is adipic acid dihydrazide.
The plurality of heat dissipation cores 20 are respectively embedded in the corresponding through holes 11 and sintered with the main body 10, two end faces of the heat dissipation cores 20 are respectively flush with the upper surface and the lower surface of the main body 10, and the heat dissipation cores 20 comprise the following raw materials in parts by weight: 50 parts of graphene nano powder, 10 parts of nano ceramic, 10 parts of nano silver powder and 10 parts of nano copper powder.
The heat dissipation coating 30 is coated on the outer surface of the main body 10 and covers the two end surfaces of the heat dissipation core 20, and the heat dissipation coating 30 is a modified graphene heat dissipation coating, and comprises the following raw materials in parts by weight: 50 parts of flake graphene, 8 parts of flake boron nitride, 70 parts of organic silicon resin, 1 part of curing agent, 3 parts of dispersing agent and 2 parts of flatting agent.
The preparation method of this example is the same as that of example 1, and the preparation method of this example will not be described in detail.
Tests prove that the heat conductivity coefficient of the sintered neodymium iron boron permanent magnet with high heat resistance and high heat conductivity prepared by the embodiment reaches 995W/mK, the sintered neodymium iron boron permanent magnet with high heat dissipation performance has the advantages that the remanence temperature coefficient is-0.089, the coercive force temperature coefficient is-0.486, the remanence temperature coefficient and the coercive force temperature coefficient are both obviously improved, and the temperature resistance of the sintered permanent magnet is improved by utilizing the characteristic that Sm element can improve the temperature resistance of the magnet.
Example 3:
a specific structure of a sintered NdFeB permanent magnet with high temperature resistance and high heat conduction comprises a main body 10, a plurality of radiating cores 20 and a radiating coating 30.
The upper and lower surfaces of the main body 10 are formed with a plurality of through holes 11, and the main body 10 comprises the following raw materials in parts by weight: 150 parts of Fe, 28 parts of Nd, 7 parts of Pr, 10 parts of Sm, 5 parts of Gd, 7 parts of La, 4 parts of Co, 3 parts of B, 2 parts of Al, 0.5 part of Zr, 5 parts of antioxidant, 15 parts of carbon nanotubes and 6 parts of aluminum nanopowder. The antioxidant is adipic acid dihydrazide.
The plurality of heat dissipation cores 20 are respectively embedded in the corresponding through holes 11 and sintered with the main body 10, two end faces of the heat dissipation cores 20 are respectively flush with the upper surface and the lower surface of the main body 10, and the heat dissipation cores 20 comprise the following raw materials in parts by weight: 60 parts of graphene nano powder, 15 parts of nano ceramic, 15 parts of nano silver powder and 15 parts of nano copper powder.
The heat dissipation coating 30 is coated on the outer surface of the main body 10 and covers the two end surfaces of the heat dissipation core 20, and the heat dissipation coating 30 is a modified graphene heat dissipation coating, and comprises the following raw materials in parts by weight: 55 parts of flaky graphene, 10 parts of flaky boron nitride, 80 parts of organic silicon resin, 2 parts of curing agent, 4 parts of dispersing agent and 3 parts of leveling agent.
The preparation method of this example is the same as that of example 1, and the preparation method of this example will not be described in detail.
Through tests, the heat conductivity coefficient of the sintered neodymium iron boron permanent magnet with high heat resistance and high heat conductivity prepared by the embodiment reaches 990W/mK, the sintered neodymium iron boron permanent magnet with high heat conductivity has good heat dissipation performance, the temperature coefficient of remanence is-0.095, the temperature coefficient of coercive force is-0.489, the temperature coefficient of remanence and the temperature coefficient of coercive force are both obviously improved, and the temperature resistance of the sintered permanent magnet is improved by utilizing the characteristic that Sm element can improve the temperature resistance of the magnet.
Example 4:
a specific structure of a sintered NdFeB permanent magnet with high temperature resistance and high heat conduction comprises a main body 10, a plurality of radiating cores 20 and a radiating coating 30.
The upper and lower surfaces of the main body 10 are formed with a plurality of through holes 11, and the main body 10 comprises the following raw materials in parts by weight: 130 parts of Fe, 26 parts of Nd, 7.5 parts of Pr, 8.5 parts of Sm, 3.5 parts of Gd, 5.5 parts of La, 3.5 parts of Co, 2.5 parts of B, 1.5 parts of Al, 0.3 part of Zr, 3 parts of antioxidant, 12 parts of carbon nanotubes and 5.5 parts of aluminum nanopowder. The antioxidant is adipic acid dihydrazide.
The plurality of heat dissipation cores 20 are respectively embedded in the corresponding through holes 11 and sintered with the main body 10, two end faces of the heat dissipation cores 20 are respectively flush with the upper surface and the lower surface of the main body 10, and the heat dissipation cores 20 comprise the following raw materials in parts by weight: 54 parts of graphene nano powder, 12 parts of nano ceramic, 12 parts of nano silver powder and 14 parts of nano copper powder.
The heat dissipation coating 30 is coated on the outer surface of the main body 10 and covers the two end surfaces of the heat dissipation core 20, and the heat dissipation coating 30 is a modified graphene heat dissipation coating, and comprises the following raw materials in parts by weight: 52 parts of flake graphene, 8.5 parts of flake boron nitride, 74 parts of organic silicon resin, 1.5 parts of curing agent, 3.2 parts of dispersing agent and 2.4 parts of leveling agent.
The preparation method of this example is the same as that of example 1, and the preparation method of this example will not be described in detail.
Through tests, the heat conductivity coefficient of the high-temperature-resistant high-heat-conductivity sintered neodymium iron boron permanent magnet prepared by the embodiment reaches 992W/mK, the high-temperature-resistant high-heat-conductivity sintered neodymium iron boron permanent magnet has good heat dissipation performance, the remanence temperature coefficient is-0.091, the coercive force temperature coefficient is-0.471, the remanence temperature coefficient and the coercive force temperature coefficient are both obviously improved, and the temperature resistance of the sintered permanent magnet is improved by utilizing the characteristic that Sm element can improve the temperature resistance of the magnet.
Example 5:
a specific structure of a sintered NdFeB permanent magnet with high temperature resistance and high heat conduction comprises a main body 10, a plurality of radiating cores 20 and a radiating coating 30.
The upper and lower surfaces of the main body 10 are formed with a plurality of through holes 11, and the main body 10 comprises the following raw materials in parts by weight: 145 parts of Fe, 27 parts of Nd, 7.8 parts of Pr, 9.5 parts of Sm, 4.5 parts of Gd, 6.5 parts of La, 3.8 parts of Co, 2.8 parts of B, 1.4 parts of Al, 0.45 part of Zr, 4.5 parts of antioxidant, 14 parts of carbon nanotubes and 5.6 parts of aluminum nanopowder. The antioxidant is adipic acid dihydrazide.
The plurality of heat dissipation cores 20 are respectively embedded in the corresponding through holes 11 and sintered with the main body 10, two end faces of the heat dissipation cores 20 are respectively flush with the upper surface and the lower surface of the main body 10, and the heat dissipation cores 20 comprise the following raw materials in parts by weight: 58 parts of graphene nano powder, 14 parts of nano ceramic, 12 parts of nano silver powder and 13 parts of nano copper powder.
The heat dissipation coating 30 is coated on the outer surface of the main body 10 and covers the two end surfaces of the heat dissipation core 20, and the heat dissipation coating 30 is a modified graphene heat dissipation coating, and comprises the following raw materials in parts by weight: 53 parts of flake graphene, 9.5 parts of flake boron nitride, 78 parts of organic silicon resin, 1.7 parts of curing agent, 3.8 parts of dispersing agent and 2.6 parts of flatting agent.
The preparation method of this example is the same as that of example 1, and the preparation method of this example will not be described in detail.
Through tests, the heat conductivity coefficient of the sintered neodymium iron boron permanent magnet with high heat resistance and high heat conductivity prepared by the embodiment reaches 994W/mK, the sintered neodymium iron boron permanent magnet with high heat conductivity has good heat dissipation performance, the remanence temperature coefficient is-0.098, the coercive force temperature coefficient is-0.474, the remanence temperature coefficient and the coercive force temperature coefficient are both obviously improved, and the temperature resistance of the sintered permanent magnet is improved by utilizing the characteristic that Sm element can improve the temperature resistance of the magnet.
Example 6:
a specific structure of a sintered NdFeB permanent magnet with high temperature resistance and high heat conduction comprises a main body 10, a plurality of radiating cores 20 and a radiating coating 30.
The upper and lower surfaces of the main body 10 are formed with a plurality of through holes 11, and the main body 10 comprises the following raw materials in parts by weight: 138 parts of Fe, 27.5 parts of Nd, 7.6 parts of Pr, 8.8 parts of Sm, 4.3 parts of Gd, 6.5 parts of La, 3.4 parts of Co, 2.6 parts of B, 1.7 parts of Al, 0.35 parts of Zr, 3.4 parts of antioxidant, 14 parts of carbon nanotubes and 5.3 parts of aluminum nanopowder. The antioxidant is adipic acid dihydrazide.
The plurality of heat dissipation cores 20 are respectively embedded in the corresponding through holes 11 and sintered with the main body 10, two end faces of the heat dissipation cores 20 are respectively flush with the upper surface and the lower surface of the main body 10, and the heat dissipation cores 20 comprise the following raw materials in parts by weight: 54 parts of graphene nano powder, 12 parts of nano ceramic, 11 parts of nano silver powder and 14 parts of nano copper powder.
The heat dissipation coating 30 is coated on the outer surface of the main body 10 and covers the two end surfaces of the heat dissipation core 20, and the heat dissipation coating 30 is a modified graphene heat dissipation coating, and comprises the following raw materials in parts by weight: 54 parts of flake graphene, 8.9 parts of flake boron nitride, 79 parts of organic silicon resin, 1.8 parts of curing agent, 3.6 parts of dispersing agent and 2.9 parts of flatting agent.
The preparation method of this example is the same as that of example 1, and the preparation method of this example will not be described in detail.
Tests prove that the heat conductivity coefficient of the high-temperature-resistant high-heat-conductivity sintered neodymium iron boron permanent magnet prepared by the embodiment reaches 978W/mK, the high-temperature-resistant high-heat-conductivity sintered neodymium iron boron permanent magnet has good heat dissipation performance, the remanence temperature coefficient is-0.091, the coercive force temperature coefficient is-0.488, the remanence temperature coefficient and the coercive force temperature coefficient are both obviously improved, and the temperature resistance of the sintered permanent magnet is improved by utilizing the characteristic that Sm element can improve the temperature resistance of the magnet.
The design key points of the invention are as follows: the main body is prepared by adopting the formula, the temperature resistance of the sintered permanent magnet is improved by utilizing the characteristic that Sm element can improve the temperature resistance of the magnet, and the heat-conducting performance of the sintered permanent magnet is effectively improved by arranging a plurality of heat-radiating cores and a heat-radiating coating which are prepared by adopting the formula of the invention in a matching way, the self-heat-radiating performance is very good, heat can not be accumulated, and the normal operation of equipment is facilitated.
The technical principle of the present invention is described above in connection with specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be construed in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without inventive effort, which would fall within the scope of the present invention.
Claims (6)
1. The utility model provides a high temperature resistant high heat conduction sintered neodymium iron boron permanent magnet which characterized in that: comprises a main body, a plurality of radiating cores and a radiating coating;
the upper and lower surfaces of the main body are penetrated and formed with a plurality of through holes, and the main body comprises the following raw materials in parts by weight: 150 parts of Fe 120, 25-28 parts of Nd, 7-8 parts of Pr, 8-10 parts of Sm, 3-5 parts of Gd, 5-7 parts of La, 3-4 parts of Co, 2-3 parts of B, 1-2 parts of Al, 0.2-0.5 part of Zr, 2-5 parts of antioxidant, 10-15 parts of carbon nano-tubes and 5-6 parts of aluminum nano-powder;
the plurality of radiating cores are respectively embedded in the corresponding through holes and are sintered together with the main body, the two end faces of the radiating cores are respectively flush with the upper surface and the lower surface of the main body, and the radiating cores comprise the following raw materials in parts by weight: 50-60 parts of graphene nano powder, 10-15 parts of nano ceramic, 10-15 parts of nano silver powder and 10-15 parts of nano copper powder;
the heat dissipation coating is coated on the outer surface of the main body and covers two end surfaces of the heat dissipation core, and the heat dissipation coating is a modified graphene heat dissipation coating and comprises the following raw materials in parts by weight: 50-55 parts of flake graphene, 8-10 parts of flake boron nitride, 70-80 parts of organic silicon resin, 1-2 parts of curing agent, 3-4 parts of dispersing agent and 2-3 parts of flatting agent.
2. The sintered NdFeB permanent magnet of claim 1, wherein: the antioxidant is adipic acid dihydrazide.
3. The sintered NdFeB permanent magnet of claim 1, wherein: the main body comprises the following raw materials in parts by weight: 140 parts of Fe, 26 parts of Nd, 8 parts of Pr, 9 parts of Sm, 4 parts of Gd, 6 parts of La, 4 parts of Co, 3 parts of B, 2 parts of Al, 0.4 part of Zr, 4 parts of antioxidant, 13 parts of carbon nanotubes and 6 parts of aluminum nanopowder.
4. The sintered NdFeB permanent magnet of claim 1, wherein: the heat dissipation core comprises the following raw materials in parts by weight: 55 parts of graphene nano powder, 14 parts of nano ceramic, 13 parts of nano silver powder and 12 parts of nano copper powder.
5. The sintered NdFeB permanent magnet of claim 1, wherein: the modified graphene heat dissipation coating comprises the following raw materials in parts by weight: 52 parts of flake graphene, 9 parts of flake boron nitride, 75 parts of organic silicon resin, 2 parts of curing agent, 3 parts of dispersing agent and 3 parts of leveling agent.
6. The preparation method of the high-temperature-resistant high-thermal-conductivity sintered NdFeB permanent magnet according to any one of claims 1 to 5, characterized by comprising the following steps: the method comprises the following steps:
(1) taking raw materials Fe, Nd, Pr, Sm, Gd, La, Co, B, Al and Zr according to a proportion, smelting an ingot, carrying out heat treatment on the ingot, crushing the ingot after heat treatment by hydrogen explosion, absorbing hydrogen for dehydrogenation, and then milling by adopting an air flow mill to prepare neodymium iron boron alloy powder;
(2) proportionally mixing an antioxidant, a carbon nanotube and nano aluminum powder with the neodymium iron boron alloy powder prepared in the step (1) in a resonant mode, and uniformly mixing the antioxidant, the carbon nanotube, the nano aluminum powder and the neodymium iron boron alloy powder under the protection of vacuum or inert gas;
(3) placing the mixture obtained in the step (2) into a mold, orienting in a magnetic field, and profiling to form a first green body, wherein a plurality of through holes are formed in the first green body;
(4) putting the first green body into another die, taking the graphene nano powder, the nano ceramic, the nano silver powder and the nano copper powder according to a certain proportion, uniformly mixing the graphene nano powder, the nano ceramic, the nano silver powder and the nano copper powder in a resonant sound mode to form mixed powder, and then pressing the mixed powder into each through hole in a high-pressure mode to form a second green body;
(5) performing isostatic pressing treatment on the second green body, then performing discharge plasma sintering, and performing three-stage tempering heat treatment to obtain a semi-finished product so as to form a main body and a heat dissipation core;
(6) taking the flaky graphene, the flaky boron nitride, the organic silicon resin, the curing agent, the dispersing agent and the flatting agent according to the proportion, blending to form the modified graphene heat dissipation coating, then coating the modified graphene heat dissipation coating on the outer surface of the semi-finished product, and placing the semi-finished product in an oven to be cured to form a heat dissipation layer, thus obtaining the finished product.
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| CN113096911A (en) * | 2021-04-09 | 2021-07-09 | 赣州嘉通新材料有限公司 | High-performance multilayer sintered neodymium-iron-boron permanent magnet and preparation method thereof |
| CN114622258A (en) * | 2022-02-10 | 2022-06-14 | 宁波招宝磁业有限公司 | Preparation method of antioxidant coating of neodymium iron boron magnet |
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