CN102969111B - Low-cost high-resistivity cerium magnet and preparation method thereof - Google Patents

Low-cost high-resistivity cerium magnet and preparation method thereof Download PDF

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CN102969111B
CN102969111B CN201210505432.9A CN201210505432A CN102969111B CN 102969111 B CN102969111 B CN 102969111B CN 201210505432 A CN201210505432 A CN 201210505432A CN 102969111 B CN102969111 B CN 102969111B
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CN102969111A (en
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郑立允
李卫
朱明刚
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Central Iron and Steel Research Institute
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Abstract

The invention provides a kind of Low-cost high-resistivity cerium magnet and preparation method thereof.The powder materials of described cerium magnet is made up of the solid surfactant of Ce-Nd-Fe-B alloy powder and this powder surface coated, described solid surfactant is at least one in the fluoride of Li, Na, Mg, Ca, Sr, Ba, Nd, Dy, Tb, Gd or Ho or oxide, and solid surfactant is the 5%-15% of Ce-Nd-Fe-B alloy powder weight; The particle diameter of described Ce-Nd-Fe-B alloy powder is the micron order of 0.5-8 μm, and the particle diameter of solid surfactant is the nanoscale of 1-100nm.Cerium permanent-magnet alloy electricalresistivityρ of the present invention >=1.0m Ω cm, maximum magnetic energy product (BH) max >=32MGsOe.This magnet significantly will reduce eddy current loss, keep the low cost of motor and engine simultaneously, can be used for the equipment such as high energy efficiency motor and high speed engine.

Description

Low-cost high-resistivity cerium magnet and preparation method thereof
Technical field
The present invention relates to permanent magnetic material field, more particularly, relate to a kind of Low-cost high-resistivity cerium magnet and preparation method thereof, this cerium magnet has low cost and high resistivity.
Background technology
In recent years, the application of rare-earth permanent magnet, makes the permanent magnet synchronous motor (PMSM) that structure is simple, power factor is high, starting torque is large progressively substitute traditional electrical exciting motor at each industrial field.But, the rare-earth permanent magnet adopted in PMSM is conductor, during work there is eddy current in inside, and along with the raising of power of motor, the volume of permanent magnet becomes large, rotor weak heat-dissipating in addition, eddy current loss not only can cause higher temperatures liter, operating efficiency is reduced, permanent magnet loss of excitation may be caused in extreme circumstances, thus reduce motor performance.
Neodymium iron boron is one of important magnet in permanent magnet synchronous motor.Compared with second generation SmCo series permanent magnetic material, Nd-Fe-Bo permanent magnet material has larger cost advantage, but still higher compared with ferrite, and wherein neodymium metal accounts for more than 90% of the cost of raw material.Along with the continuous increase of Global Rare-earth Permanent Magnet material yield, the use amount of neodymium metal increases substantially, and price constantly rises, and causes very large pressure to magnetic materials production enterprise and user.
In natural rare earth resources, except neodymium, also have rich reserves and cheap rare earth metal Ce, La, Pr etc., wherein, Ce, La two kinds of constituent contents are the highest.In Rare Earth Mine, various rare earth element is symbiosis, and the cost of exploitation, separation, purification is higher, and causes serious environmental disruption.Utilize rare earth element ce, La to manufacture sintering Ce-Nd-Fe-B permanent magnetic material, both can reduce the cost of raw material of RE-Fe-B permanent magnet, can rare earth resources be fully utilized again, there is very important strategic importance.
But, Ce-Nd-Fe-B permanent magnetic material is also conductor, in order to not cause irreversible thermal reunite in machine operation process, guarantees original magnetic flux, fundamentally solve the thermal reunite problem of motor rare-earth permanent magnet, the eddy current loss of permanent magnet motor must be reduced.
The method of traditional minimizing permanent magnet motor eddy current loss is designed by rotor, and as segmentation magnet unit reduces eddy current loss, but cutting magnet will improve manufacturing cost greatly.
Another approach reducing permanent magnet motor eddy current loss is that the resistivity by improving permanent magnet reduces eddy current loss.Polymeric adhesion magnet has high resistivity due to the insulation effect of bonding agent, but their working temperature is subject to the softening restriction of macromolecular material, simultaneously because magnetic dilution effect makes its maximum magnetic energy product lower than similar sintered magnet several times.
Therefore, develop the Ce-Nd-Fe-B built-up magnet of a kind of low cost, high resistivity, significantly reduce the cost of rare-earth permanent magnet, reduce eddy current loss, improve electric efficiency, reduce institute's energy requirement, reduce CO 2discharge, keeps the low cost of motor simultaneously, can be used for high energy efficiency motor and high speed engine equipment, be of great significance to the high speed development in the energy-conserving and environment-protective field of China.
Summary of the invention
For the problems referred to above, the invention provides the cerium magnet permanent-magnet alloy and preparation method thereof of a kind of low cost, high resistivity, make this permanent-magnet alloy on the basis keeping original superior magnetic property, cost reduces, resistivity improves.
According to an aspect of the present invention, the invention provides a kind of Low-cost high-resistivity cerium magnet, be made up of powder metallurgy process, the powder materials of this cerium magnet is made up of the solid surfactant of Ce-Nd-Fe-B alloy powder and this powder surface coated, and the composition of described Ce-Nd-Fe-B alloy powder is Ce 30-xnd x(Fe, TM) ba1b yx is 6-29, ba1 is 68.5-69.2, y is 0.8-1.5, wherein, TM is one or more in Ga, Co, Cu, Nb, described solid surfactant is at least one in the fluoride of Li, Na, Mg, Ca, Sr, Ba, Nd, Dy, Tb, Gd or Ho or oxide, described solid surfactant is formed as the layer insulated, solid surfactant is the 5%-15% of Ce-Nd-Fe-B alloy powder weight, the particle diameter of described Ce-Nd-Fe-B alloy powder is micron order, and the particle diameter of solid surfactant is nanoscale.
The particle diameter of described Ce-Nd-Fe-B alloy powder is 0.5-8 μm, and the particle diameter of solid surfactant is 1-100nm.
Electricalresistivityρ >=1.0m Ω the cm of described Low-cost high-resistivity cerium magnet, maximum magnetic energy product (BH) max >=32MGsOe.
The resistivity of described Low-cost high-resistivity cerium magnet is 1.0-2.0m Ω cm, and magnetic energy product is 32-45MGsOe, and coercive force is 9-15kOe, and remanent magnetism is 10-15kGs.
According to a further aspect in the invention, there is provided a kind of preparation method of Low-cost high-resistivity cerium magnet, described method comprises the steps: (1) melting: be Ce by metal Nd, Ce, Fe, Ga, Co, Cu and alloy NdFe, BFe, DyFe according to component atoms percentage 30-xnd x(Fe, TM) ba1b ycarry out melting, x is 6-29, ba1 be 68.5-69.2, y is 0.8-1.5, and wherein, TM is one or more in Ga, Co, Cu, Nb, and adopt strip casting technique to prepare Ce-Nd-Fe-B alloy rapid-hardening flake, thickness is 0.2-0.5mm; (2) by described rapid-hardening flake, through hydrogen, broken and air-flow grinds the micron powder for for particle diameter being 0.5-8 μm; (3) in described micron powder, the inorganic nano solid surfactant that particle diameter is 1-100nm is added, put in high-energy ball milling tank, fill it up with in ball-milling medium absolute ethyl alcohol, acetone, normal heptane, n-hexane one or more, by solid surfactant high-energy ball milling, after powder drying after ball milling, obtain the flaky powder with surface insulation coating; (4) compressing by magnetic field orientating; (5) by hot-forming acquisition high-resistivity permanent magnetic alloy.
Described solid surfactant is at least one in the fluoride of Li, Na, Mg, Ca, Sr, Ba, Nd, Dy, Tb, Gd or Ho or oxide.
The additional proportion of described solid surfactant is the 5wt%-15wt% of airflow milling raw meal.
In step (3), High Energy Ball Milling Time is 1-8 hour, ratio of grinding media to material 10: 1-30: 1.
Magnetic field intensity during magnetic field orientating is compressing is 2T, and pressure is 160-300Mpa.
Hot-formingly refer to carry out in vacuum hotpressing stove shaping.
Vacuum degree in hot-forming process is higher than 1.0 × 10 -1pa, hot-forming temperature is 540-560 DEG C, and temperature retention time is 1-5min.
Compared with prior art, beneficial effect of the present invention is:
1, the dystectic inorganic nanoparticles doping permanent magnet used in the present invention, not only can improve the resistivity of magnet, keep the magnetic property that it is high simultaneously.
2, the present invention is while improving magnet resistive rate, reducing costs, give full play to the excellent magnetic energy of Ce-Nd-Fe-B magnet, by changing the microstructure of alloy after the kind of inorganic nanoparticles, content and doping, realize the Modulatory character of the resistivity of high resistivity inorganic nanoparticles doping vario-property Ce-Nd-Fe-B magnet, the Ce-Nd-Fe-B permanent-magnet alloy of high resistivity, high energy product can be prepared, electricalresistivityρ >=1.0m Ω cm, (BH) max >=32MGsOe;
3, high-resistivity permanent magnetic alloy of the present invention significantly can reduce eddy current loss, improves electric efficiency, reduces institute's energy requirement, reduces CO 2discharge, keeps the low cost of motor simultaneously, can be used for high energy efficiency motor and high speed engine equipment, can be used for hybrid vehicle, train, steamer, wind power generation etc.
Embodiment
The present invention is described in detail according to embodiment.
Principle of the present invention is: employing high-melting-point, insulative inorganic material nano-powder carry out solid surfactant high-energy ball milling to cerium Nd-Fe-Bo permanent magnet material powder, pass through high-energy ball milling, the mixture of permanent magnet alloy powder and solid inorganic nano powder is by abrading-ball impact extruded, the solid surfactant nano-powder of high resistivity embeds the surface of Ce-Nd-Fe-B alloyed powder, and the composition of Ce-Nd-Fe-B alloyed powder is Ce 30-xnd x(Fe, TM) ba1b yx is 6-29, ba1 is 68.5-69.2, y is 0.8-1.5, wherein, TM is one or more in Ga, Co, Cu, Nb, extruded by the repeated stock of abrading-ball subsequently, formed surface be covered with inorganic nanometer-powder insulating coating, anisotropy flaky powder, its c-axis all in sheet, be parallel to sheet surface, improved density and the anisotropy of material again by magnetic field orientating hot-pressing technique, obtain the magnet of multi-layer sheet structure.This magnet is different from the macromolecule bonded permanent magnet of traditional grain structure, the magnet c-axis of this multi-layer sheet structure is parallel to the direction of layer, the i.e. direction of magnetization, interlayer is due to the insulating effect of inorganic nano material, higher in the resistivity perpendicular to the direction of magnetization, the magnetic property keeping it high while obtaining high resistivity.
Specifically, powder materials in Low-cost high-resistivity cerium magnet in the present invention is made up of the solid surfactant of Ce-Nd-Fe-B alloy powder and this powder surface coated, described solid surfactant is Li, Na, Mg, Ca, Sr, Ba, Nd, Dy, Tb, at least one in the fluoride of Gd or Ho or oxide, described solid surfactant is formed as the layer insulated, solid surfactant is the 5%-15% of Ce-Nd-Fe-B alloy powder weight, the particle diameter of described Ce-Nd-Fe-B alloy powder is micron order, the particle diameter of solid surfactant is nanoscale.The particle diameter of described Ce-Nd-Fe-B alloy powder is 0.5-8 μm, and the particle diameter of solid surfactant is 1-100nm.Electricalresistivityρ >=1.0m Ω the cm of described Low-cost high-resistivity cerium magnet, maximum magnetic energy product (BH) max >=32MGsOe.The resistivity of described Low-cost high-resistivity cerium magnet is 1.0-2.0m Ω cm, and magnetic energy product is 32-45MGsOe, and coercive force is 9-15kOe, and remanent magnetism is 10-15kGs.
By the invention provides a kind of preparation method of Low-cost high-resistivity cerium magnet, described preparation method comprises the steps: (1) melting: be Ce by metal Nd, Ce, Fe, Ga, Co, Cu and alloy NdFe, BFe, DyFe according to component atoms percentage 30-xnd x(Fe, TM) ba1b ycarry out melting, x is 6-29, ba1 be 68.5-69.2, y is 0.8-1.5, and wherein, TM is one or more in Ga, Co, Cu, Nb, adopts strip casting technique to prepare Ce-Nd-Fe-B alloy rapid-hardening flake, thickness 0.2-0.5mm; (2) by described rapid-hardening flake, through hydrogen, broken and air-flow grinds the micron powder for for particle diameter being 0.5-8 μm; (3) in described micron powder, the inorganic nano solid surfactant that particle diameter is 1-100nm is added, put in high-energy ball milling tank, fill it up with in ball-milling medium absolute ethyl alcohol, acetone, normal heptane, n-hexane one or more, by solid surfactant high-energy ball milling, after powder drying after ball milling, obtain the flaky powder with surface insulation coating; (4) compressing by magnetic field orientating; (5) by hot-forming acquisition high-resistivity permanent magnetic alloy.Described solid surfactant is at least one in the fluoride of Li, Na, Mg, Ca, Sr, Ba, Nd, Dy, Tb, Gd or Ho or oxide.The additional proportion of described solid surfactant is the 5wt%-15wt% of airflow milling raw meal.In step (3), High Energy Ball Milling Time is 1-8 hour, ratio of grinding media to material 10: 1-30: 1.Magnetic field intensity during magnetic field orientating is compressing is 2T, and pressure is 160-300Mpa.Hot-formingly refer to carry out in vacuum hotpressing stove shaping.Vacuum degree in hot-forming process is higher than 1.0 × 10 -1pa, hot-forming temperature is 540-560 DEG C, and temperature retention time is 1-5min.Below by the permanent-magnet alloy that concrete description is obtained by method of the present invention, its test parameter and properties will illustrate hereinafter.
Embodiment of the present invention will be described below, and nationality is by embodiment, and feature of the present invention, advantage will become more obvious.
Embodiment 1:
Adopt preparation method of the present invention to prepare a kind of cerium magnet permanent-magnet alloy, in embodiment 1, the Ce-Nd-Fe-B alloying component of melting gained is Ce according to percentage 24nd 6(Fe, Co) 69.2b 0.8, first, described obtained Ce-Nd-Fe-B alloy is made rapid-hardening flake, grinds into micron powder through hydrogen fragmentation with air-flow, specifically, be 0.5 μm to 8 μm through hydrogen fragmentation with the micron powder particle diameter that air-flow grinds in embodiment 1, then adopt CaF 2nano powder is as solid surfactant, and the particle diameter of the solid surfactant selected is 1-100nm, this solid surfactant can form the layer of insulation at above-mentioned Ce-Nd-Fe-B alloy powder outer surface, its additional proportion is the 5wt% of airflow milling raw meal, the flaky powder with surface insulation coating is obtained by high-energy ball milling, wherein High Energy Ball Milling Time used is 1.5 hours, ratio of grinding media to material 30: 1, ball-milling medium absolute ethyl alcohol; Compressing in magnetic field, magnetic field 2T used, pressure is 180MPa; Finally, hot-forming acquisition high-resistivity permanent magnetic alloy, wherein hot-forming vacuum degree is higher than 1.0 × 10 -1pa, hot pressing temperature is 550 DEG C, and temperature retention time is 1min.
Under above-mentioned preparation process condition, the resistivity of prepared high-resistivity permanent magnetic alloy: 1.0m Ω cm, magnetic energy product 33MGsOe, coercive force is 11kOe, remanent magnetism 12kGs.All meet the needs to this high-resistivity permanent magnetic alloy in reality.
Embodiment 2:
Adopt preparation method of the present invention to prepare cerium magnet permanent-magnet alloy, in embodiment 2, the Ce-Nd-Fe-B alloying component of melting gained is Ce according to percentage 1nd 29(Fe, Ca) 69b 1, first, Ce-Nd-Fe-B alloy is made rapid-hardening flake, grinds into micron powder through hydrogen fragmentation with air-flow, specifically, be 0.5 μm to 8 μm through hydrogen fragmentation with the micron powder particle diameter that air-flow grinds, then adopt NdF 3nano powder is as solid surfactant, and the solid surfactant NdF selected 3the particle diameter of nano powder is 1-100nm, this solid surfactant can form the layer of insulation at above-mentioned Ce-Nd-Fe-B alloy powder outer surface, its additional proportion is the 10wt% of airflow milling raw meal, the flaky powder with surface insulation coating is obtained by high-energy ball milling, wherein High Energy Ball Milling Time used is 1.5 hours, ratio of grinding media to material 10: 1, ball-milling medium acetone; Compressing in magnetic field, magnetic field 2T used, pressure is 180MPa; Finally, hot-forming acquisition high-resistivity permanent magnetic alloy, wherein hot-forming vacuum degree is higher than 1.0 × 10 -1pa, hot pressing temperature is 550 DEG C, and temperature retention time is 5min.
Under above-mentioned preparation process condition, the resistivity of prepared high-resistivity permanent magnetic alloy: 1.1m Ω cm, magnetic energy product 32MGsOe, coercive force is 10kOe, remanent magnetism 12kGs.All meet the needs to this high resistance permanent-magnet alloy in reality.
Embodiment 3:
Adopting preparation method of the present invention to prepare cerium magnet permanent-magnet alloy, is Ce through the Ce-Nd-Fe-B alloying component of melting gained according to percentage in the present embodiment 16nd 14(Fe, Cu) 68.5b 1.5, first, Ce-Nd-Fe-B alloy is made rapid-hardening flake, grinds into micron powder through hydrogen fragmentation with air-flow, be 0.5 μm to 8 μm through hydrogen fragmentation with the micron powder particle diameter that air-flow grinds in the present embodiment, then adopt DyF 3nano powder is as solid surfactant, the particle diameter of this nano powder is 1-100nm, its additional proportion is the 5wt% of airflow milling raw meal, the flaky powder with surface insulation coating is obtained by high-energy ball milling, wherein High Energy Ball Milling Time used is 1.5 hours, ratio of grinding media to material 10: 1, ball-milling medium normal heptane; Compressing in magnetic field, magnetic field 2T used, pressure is 180MPa; Finally, hot-forming acquisition high-resistivity permanent magnetic alloy, wherein hot-forming vacuum degree is higher than 1.0 × 10 -1pa, hot pressing temperature is 550 DEG C, and temperature retention time is 1min.
Under above-mentioned preparation process condition, the resistivity of prepared high-resistivity permanent magnetic alloy: 1.0m Ω cm, magnetic energy product 45MGsOe, coercive force is 12kOe, remanent magnetism 14kGs.All meet the needs to this high resistance permanent-magnet alloy in reality.
Embodiment 4:
Adopting preparation method of the present invention to prepare cerium magnet permanent-magnet alloy, is Ce through the Ce-Nd-Fe-B alloying component of melting gained according to percentage in the present embodiment 10nd 20(Fe, Nb) 69b 1, first, Ce-Nd-Fe-B alloy is made rapid-hardening flake, grinds into micron powder through hydrogen fragmentation with air-flow, particularly, be 0.5 μm to 8 μm through hydrogen fragmentation with the micron powder particle diameter that air-flow grinds in the present embodiment, then adopt CaF 2nano powder is as solid surfactant, the particle diameter of this nano powder is 1-100nm, its additional proportion is the 15wt% of airflow milling raw meal, the flaky powder with surface insulation coating is obtained by high-energy ball milling, wherein High Energy Ball Milling Time used is 1 hour, ratio of grinding media to material 10: 1, ball-milling medium n-hexane; Compressing in magnetic field, magnetic field 2T used, pressure is 180MPa; Finally, hot-forming acquisition high-resistivity permanent magnetic alloy, wherein hot-forming vacuum degree is higher than 1.0 × 10 -1pa, hot pressing temperature is 550 DEG C, and temperature retention time is 1min.
Under above-mentioned preparation process condition, the resistivity 1.8m Ω cm of prepared high-resistivity permanent magnetic alloy, magnetic energy product 32MGsOe, coercive force is 12.5kOe, remanent magnetism 10.8kGs.All meet the needs to this high resistance permanent-magnet alloy in reality.
Embodiment 5
Adopt the method step identical with the step of the method for embodiment 1 to prepare cerium magnet permanent-magnet alloy, the alloy component range of smelting is in the same manner as in Example 1, and the kind of the present embodiment adjustment nano powder, namely selects NdF 3as solid surfactant, the particle size range of alloy powder and solid activator is same as the previously described embodiments, additional proportion is airflow milling raw meal, the namely 12wt% of the weight of Ce-Nd-Fe-B alloy powder, the flaky powder with surface insulation coating is obtained by high-energy ball milling, High Energy Ball Milling Time 8h, ratio of grinding media to material 20: 1, ball-milling medium is the mixture of n-hexane and normal heptane; Shaping magnetic field dens in dente beggar, magnetic field 2T used, pressure is 300MPa; Finally, hot-forming acquisition high-resistivity permanent magnetic alloy, wherein hot-forming vacuum degree is higher than 1.0 × 10 -1pa, hot pressing temperature is 540 DEG C, and temperature retention time is 3min.
Under above-mentioned preparation process condition, the resistivity of prepared high-resistivity permanent magnetic alloy: 2.0m Ω cm, magnetic energy product 40MGsOe, coercive force is 15kOe, remanent magnetism 15kGs.All meet the needs to this high resistance permanent-magnet alloy in reality.
Described TM element in Ce-Nd-Fe-B alloy in the present invention is trace element, and the percentage by weight of the addition of trace element is no more than 2%, but the interpolation of this trace element drastically increases the performance of magnetic alloy powder of the present invention.
Concise and to the point in order to what illustrate, repeat no more other embodiments, although only describe a part of embodiment in an embodiment, but what those skilled in the art should understand that is, the invention is not restricted to embodiment described here, such as, the preparation method of permanent-magnet alloy of the present invention can use different solid activator, as long as can meet identical effect, these changes include within the scope of the invention.Same, the present invention can use different ball-milling mediums.
The invention is not restricted to above-described embodiment, without departing from the present invention, can various changes and modifications be carried out.

Claims (10)

1. a Low-cost high-resistivity cerium magnet, it is characterized in that, be made up of powder metallurgy process, the powder materials of this cerium magnet is made up of the solid surfactant of Ce-Nd-Fe-B alloy powder and this powder surface coated, and the composition of described Ce-Nd-Fe-B alloy powder is Ce by weight percentage 30-xnd x(Fe, TM) balb yx is 6-29, ba1 is 68.5-69.2, y is 0.8-1.5, wherein, TM is one or more in Ga, Co, Cu, Nb, described solid surfactant is at least one in the fluoride of Li, Na, Mg, Ca, Sr, Ba, Nd, Dy, Tb, Gd or Ho or oxide, described solid surfactant is formed as the layer insulated, solid surfactant is the 5%-15% of Ce-Nd-Fe-B alloy powder weight, the particle diameter of described Ce-Nd-Fe-B alloy powder is micron order, and the particle diameter of solid surfactant is nanoscale; The resistivity of described cerium magnet is 1.0-2.0m Ω cm, and magnetic energy product is 32-45MGsOe.
2. Low-cost high-resistivity cerium magnet as claimed in claim 1, it is characterized in that: the particle diameter of described Ce-Nd-Fe-B alloy powder is 0.5-8 μm, the particle diameter of solid surfactant is 1-100nm.
3. Low-cost high-resistivity cerium magnet as claimed in claim 2, is characterized in that: the coercive force of described cerium magnet is 9-15kOe, and remanent magnetism is 10-15kGs.
4. a preparation method for Low-cost high-resistivity cerium magnet, is characterized in that: the preparation method of described cerium magnet comprises the steps:
(1) melting: be Ce according to component atoms percentage by metal Nd, Ce, Fe, Ga, Co, Cu and alloy NdFe, BFe, DyFe 30-xnd x(Fe, TM) balb ycarry out melting, x is 6-29, ba1 be 68.5-69.2, y is 0.8-1.5, and wherein, TM is one or more in Ga, Co, Cu, Nb, and adopt strip casting technique to prepare Ce-Nd-Fe-B alloy rapid-hardening flake, thickness is 0.2-0.5mm;
(2) by described rapid-hardening flake, through hydrogen, broken and air-flow grinds the micron powder for for particle diameter being 0.5-8 μm;
(3) in described micron powder, the inorganic nano solid surfactant that particle diameter is 1-100nm is added, put in high-energy ball milling tank, fill it up with in ball-milling medium absolute ethyl alcohol, acetone, normal heptane, n-hexane one or more, by solid surfactant high-energy ball milling, after powder drying after ball milling, obtain the flaky powder with surface insulation coating;
(4) compressing by magnetic field orientating;
(5) by hot-forming acquisition high-resistivity permanent magnetic alloy.
5. preparation method as claimed in claim 4, is characterized in that: described solid surfactant is at least one in the fluoride of Li, Na, Mg, Ca, Sr, Ba, Nd, Dy, Tb, Gd or Ho or oxide.
6. the preparation method as described in claim 4 or 5, is characterized in that: the additional proportion of described solid surfactant is the 5wt%-15wt% of airflow milling raw meal.
7. the preparation method as described in claim 4 or 5, is characterized in that: in step (3), High Energy Ball Milling Time is 1-8 hour, ratio of grinding media to material 10:1-30:1.
8. the preparation method as described in claim 4 or 5, is characterized in that: the magnetic field intensity during described magnetic field orientating is compressing is 2T, and pressure is 160-300MPa.
9. the preparation method as described in claim 4 or 5, is characterized in that: described hot-forming carry out in vacuum hotpressing stove shaping of referring to.
10. preparation method as claimed in claim 5, is characterized in that: the vacuum degree in described hot-forming process is higher than 1.0 × 10 -1pa, hot-forming temperature is 540-560 DEG C, and temperature retention time is 1-5min.
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CN104900360B (en) * 2015-05-28 2017-07-25 钢铁研究总院 A kind of permanent-magnet alloy for adding compound low price rare earth and preparation method thereof
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CN110379579A (en) * 2019-06-20 2019-10-25 杭州永磁集团有限公司 The preparation method of high resistivity 2:17 type samarium cobalt permanent magnet body

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