CN105374487A - Corrosion-resistant high-performance rare earth permanent magnet material - Google Patents
Corrosion-resistant high-performance rare earth permanent magnet material Download PDFInfo
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- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
- H01F1/04—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys
- H01F1/047—Alloys characterised by their composition
- H01F1/053—Alloys characterised by their composition containing rare earth metals
- H01F1/055—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5
- H01F1/057—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
- H01F1/0571—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
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- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
- H01F1/04—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys
- H01F1/047—Alloys characterised by their composition
- H01F1/053—Alloys characterised by their composition containing rare earth metals
- H01F1/055—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5
- H01F1/057—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
- H01F1/0571—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes
- H01F1/0575—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes pressed, sintered or bonded together
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Abstract
The invention relates to a corrosion-resistant high-performance rare earth permanent magnet material. The corrosion-resistant high-performance rare earth permanent magnet material is prepared from, by weight, 20-35% of rare earth elements, 0.8-1.5% of boron, 0.02-0.2% of tungsten, 0.5-5% of silicon, 0.1-3% of vanadium, 0.02-0.5% of gallium, 0.02-0.5% of zirconium, 0.02-0.5% of chromium, 0.5-5% of copper and the balance iron and inevitable impurities. The rare earth permanent magnet material has high corrosion resistance and excellent mechanical performance and is low in cost and high in stability, a preparation method is simple, and large-scale industrial production can be easily achieved.
Description
Technical field
The invention belongs to alloy field, be all greatly improved and rare earth permanent-magnetic material with low cost in particular to a kind of corrosion-resistant high-performance ability and mechanical property.
Background technology
Since 1966, added a newcomer in permanent magnetic material, it is exactly " rare-earth permanent magnet ".Due to the performance of rare earth permanent-magnetic material excellence, its application that appears as opens the brand-new gate of a fan.Particularly the third generation rare earth permanent-magnetic material neodymium iron boron of nineteen eighty-three appearance, is the permanent magnetic material that in the world today, magnetic is the strongest always.
Nd-Fe-B rare earth permanent magnetic material is the important foundation material supporting modern society, closely bound up with the life of people.Little of wrist-watch, camera, recorder, CD player, VCD machine, hard disc of computer, CD drive, arrive greatly automobile, generating
Machine, aerotrain, Medical Instruments etc., permanent magnetic material is omnipresent.Magnetic material is filled with in low-carbon (LC) life, rare earth permanent magnet NdFeB material plays very important role, in wind power generation, hybrid power/electric automobile, energy-conservation household electrical appliances etc., all be unable to do without rare earth permanent-magnetic material, the rare earth permanent magnet variable-frequency motor etc. wherein in the rare earth permanent-magnet synchronization motor of direct current permanent magnetic Wind turbines, hybrid electric vehicle, convertible frequency air-conditioner all have employed Nd-Fe-B rare earth permanent magnetic material.
But the rich neodymium of sintered NdFeB has high electro-chemical activity mutually, and the structure of sintered magnet is fine and close not, there is a large amount of hole, and corrosion-resistant high-performance is poor, greatly limit its scope of application.As in room temperature humid air, the oxidation of the oxidation of magnet mainly iron; In 150 DEG C of dry gas or moisture, the mainly oxidation of neodymium, these all will significantly reduce the magnetic property of magnet.The corrosion mechanism of NdFeB magnet is electrochemical corrosion.Nd in magnet
2fe
14the electrochemical potentials of B, rich neodymium phase is different, causes electrochemical reaction and forms primary cell.When the pollutant of magnet surface forms galvanic circle, the neodymium (-2.4V) of electronegative potential becomes anode and oxidized.Due to neodymium anode and Nd
2fe
14the relative quantity difference of B negative electrode is very large, forms primary anode and large negative electrode.Rich neodymium bears very large corrosion electric current density mutually, and therefore along crystal boundary accelerated corrosion, form intercrystalline corrosion, this will cause magnet coercive force to decline.
Summary of the invention
The invention provides a kind of corrosion-resistant high-performance rare-earth permanent magnet material, this rare earth permanent-magnetic material has high-corrosion resistance, good mechanical performance, and with low cost, and stability is high, and manufacture method is simple, easily realizes large-scale industrial production.
Specifically, a kind of corrosion-resistant high-performance rare-earth permanent magnet material, comprises rare earth element, iron, boron, tungsten, silicon, vanadium, gallium, zirconium, chromium, copper, the percentage by weight of each component is: rare earth element 20-35%, boron 0.8-1.5%, tungsten 0.02-0.2%, silicon 0.5-5%, vanadium 0.1-3%, gallium 0.02-0.5%, zirconium 0.02-0.5%, chromium 0.02-0.5%, copper 0.5-5%, surplus is iron and inevitable impurity.
In the execution mode that the present invention one is concrete, the corrosion-resistant high-performance rare-earth permanent magnet material of described one, comprises rare earth element, iron, boron, tungsten, silicon, vanadium, gallium, zirconium, chromium, copper, the percentage by weight of each component is: rare earth element 20-35%, boron 0.8-1.5%, tungsten 0.02-0.2%, silicon 0.5-5%, vanadium 0.1-3%, gallium 0.02-0.5%, zirconium 0.02-0.5%, chromium 0.02-0.5%, copper 0.5-5%, surplus is iron and inevitable impurity, and rare earth element is the combination of neodymium, cerium, dysprosium and ytterbium.
In the execution mode that the present invention one is concrete, the corrosion-resistant high-performance rare-earth permanent magnet material of described one, wherein the weight ratio of neodymium, cerium, dysprosium and ytterbium is 20:0.5:2:1.5.
In the execution mode that the present invention one is concrete, the corrosion-resistant high-performance rare-earth permanent magnet material of described one, comprises rare earth element, iron, boron, tungsten, silicon, vanadium, gallium, zirconium, chromium, copper, the percentage by weight of each component is: boron 1.0%, tungsten 0.1%, silicon 3%, vanadium 1.5%, gallium 0.3%, zirconium 0.1%, chromium 0.2%, copper 3%, neodymium 20%, cerium 0.5%, dysprosium 2%, ytterbium 1.5%, surplus is iron and inevitable impurity.
In the execution mode that the present invention one is concrete, the corrosion-resistant high-performance rare-earth permanent magnet material of the one stated, comprises rare earth element, iron, boron, tungsten, silicon, vanadium, gallium, zirconium, chromium, copper, the percentage by weight of each component is: boron 1.2%, tungsten 0.14%, silicon 2%, vanadium 2%, gallium 0.15%, zirconium 0.3%, chromium 0.4%, copper 2%, neodymium 24%, cerium 0.6%, dysprosium 2.4%, ytterbium 1.8%, surplus is iron and inevitable impurity.
In the execution mode that the present invention one is concrete, the corrosion-resistant high-performance rare-earth permanent magnet material of described one, comprises rare earth element, iron, boron, tungsten, silicon, vanadium, gallium, zirconium, chromium, copper, the percentage by weight of each component is: boron 1.4%, tungsten 0.06%, silicon 1%, vanadium 2.5%, gallium 0.45%, zirconium 0.4%, chromium 0.1%, copper 4.5%, neodymium 28%, cerium 0.7%, dysprosium 2.8%, ytterbium 2.1%, surplus is iron and inevitable impurity.
Corrosion-resistant high-performance rare-earth permanent magnet material of the present invention can adopt common production equipment conventionally to prepare.Such as, concrete steps can comprise:
(1) raw material prepare: prepared burden by weight ratio by the raw material removed through surface;
(2) ingot casting: raw material is added in smelting furnace, vacuumize, and under 0.05MPa argon shield, carry out melting and be cast into ingot, then ingot casting is put Homogenization Treatments in a vacuum furnace, the temperature of described process is 900-960 DEG C, and the time is 8-10 hour;
(3) powder process: the ingot casting of Homogenization Treatments is carried out hydrogen fragmentation, to the alloy powder of 200-250 μm, then carries out Dehydroepiandrosterone derivative;
(4) pressing under magnetic field: above-mentioned magnetic is placed on orientation in the magnetic field of 1.2T-2.0T, compressing with the pressure of 10MPa-20MPa;
(5) sinter: sinter in vacuum air-quenching furnace, sintering temperature is 1100-1180 DEG C, and sintering time is 4-5 hour;
(6) Ageing Treatment: the magnet sintered is carried out double tempering heat treatment, tempering heat treatment temperature is 900-1000 DEG C for the first time, and the time is 4-5 hour, and second time tempering heat treatment temperature is 400-600 DEG C, and the time is 7-9 hour;
(7) magnetize, the magnet prepared is magnetized again, to obtain final product through above-mentioned steps.
Rare earth permanent-magnetic material of the present invention has high-corrosion resistance, good mechanical performance, and with low cost, and stability is high, and manufacture method is simple, easily realizes large-scale industrial production.
Embodiment
Below in conjunction with embodiment, the invention will be further described.
Embodiment 1:
A kind of corrosion-resistant high-performance rare-earth permanent magnet material, comprise rare earth element, iron, boron, tungsten, silicon, vanadium, gallium, zirconium, chromium, copper, the percentage by weight of each component is: boron 1.0%, tungsten 0.1%, silicon 3%, vanadium 1.5%, gallium 0.3%, zirconium 0.1%, chromium 0.2%, copper 3%, neodymium 20%, cerium 0.5%, dysprosium 2%, ytterbium 1.5%, surplus is iron and inevitable impurity;
Concrete steps comprise:
(1) raw material prepare: prepared burden by weight ratio by the raw material removed through surface;
(2) ingot casting: raw material is added in smelting furnace, vacuumize, and under 0.05MPa argon shield, carry out melting and be cast into ingot, then ingot casting is put Homogenization Treatments in a vacuum furnace, the temperature of described process is 950 DEG C, and the time is 9 hours;
(3) powder process: the ingot casting of Homogenization Treatments is carried out hydrogen fragmentation, to the alloy powder of 200 μm, then carries out Dehydroepiandrosterone derivative;
(4) pressing under magnetic field: above-mentioned magnetic is placed on orientation in the magnetic field of 1.5T, compressing with the pressure of 20MPa;
(5) sinter: sinter in vacuum air-quenching furnace, sintering temperature is 1100 DEG C, and sintering time is 5 hours;
(6) Ageing Treatment: the magnet sintered is carried out double tempering heat treatment, tempering heat treatment temperature is 950 DEG C for the first time, and the time is 5 hours, and second time tempering heat treatment temperature is 500 DEG C, and the time is 8 hours;
(7) magnetize, the magnet prepared is magnetized again, to obtain final product through above-mentioned steps.
Embodiment 2:
A kind of corrosion-resistant high-performance rare-earth permanent magnet material, comprise rare earth element, iron, boron, tungsten, silicon, vanadium, gallium, zirconium, chromium, copper, the percentage by weight of each component is: boron 1.2%, tungsten 0.14%, silicon 2%, vanadium 2%, gallium 0.15%, zirconium 0.3%, chromium 0.4%, copper 2%, neodymium 24%, cerium 0.6%, dysprosium 2.4%, ytterbium 1.8%, surplus is iron and inevitable impurity;
Concrete steps comprise:
(1) raw material prepare: prepared burden by weight ratio by the raw material removed through surface;
(2) ingot casting: raw material is added in smelting furnace, vacuumize, and under 0.05MPa argon shield, carry out melting and be cast into ingot, then ingot casting is put Homogenization Treatments in a vacuum furnace, the temperature of described process is 900 DEG C, and the time is 10 hours;
(3) powder process: the ingot casting of Homogenization Treatments is carried out hydrogen fragmentation, to the alloy powder of 230 μm, then carries out Dehydroepiandrosterone derivative;
(4) pressing under magnetic field: above-mentioned magnetic is placed on orientation in the magnetic field of 1.2T, compressing with the pressure of 15MPa;
(5) sinter: sinter in vacuum air-quenching furnace, sintering temperature is 1100 DEG C, and sintering time is 5 hours;
(6) Ageing Treatment: the magnet sintered is carried out double tempering heat treatment, tempering heat treatment temperature is 1000 DEG C for the first time, and the time is 4 hours, and second time tempering heat treatment temperature is 600 DEG C, and the time is 9 hours;
(7) magnetize, the magnet prepared is magnetized again, to obtain final product through above-mentioned steps.
Embodiment 3:
A kind of corrosion-resistant high-performance rare-earth permanent magnet material, comprise rare earth element, iron, boron, tungsten, silicon, vanadium, gallium, zirconium, chromium, copper, the percentage by weight of each component is: boron 1.4%, tungsten 0.06%, silicon 1%, vanadium 2.5%, gallium 0.45%, zirconium 0.4%, chromium 0.1%, copper 4.5%, neodymium 28%, cerium 0.7%, dysprosium 2.8%, ytterbium 2.1%, surplus is iron and inevitable impurity;
Concrete steps comprise:
(1) raw material prepare: prepared burden by weight ratio by the raw material removed through surface;
(2) ingot casting: raw material is added in smelting furnace, vacuumize, and under 0.05MPa argon shield, carry out melting and be cast into ingot, then ingot casting is put Homogenization Treatments in a vacuum furnace, the temperature of described process is 960 DEG C, and the time is 9 hours;
(3) powder process: the ingot casting of Homogenization Treatments is carried out hydrogen fragmentation, to the alloy powder of 250 μm, then carries out Dehydroepiandrosterone derivative;
(4) pressing under magnetic field: above-mentioned magnetic is placed on orientation in the magnetic field of 1.8T, compressing with the pressure of 12MPa;
(5) sinter: sinter in vacuum air-quenching furnace, sintering temperature is 1180 DEG C, and sintering time is 5 hours;
(6) Ageing Treatment: the magnet sintered is carried out double tempering heat treatment, tempering heat treatment temperature is 900 DEG C for the first time, and the time is 5 hours, and second time tempering heat treatment temperature is 400 DEG C, and the time is 9 hours;
(7) magnetize, the magnet prepared is magnetized again, to obtain final product through above-mentioned steps.
Comparative example 1:
A kind of corrosion-resistant high-performance rare-earth permanent magnet material, comprise rare earth element, iron, boron, silicon, vanadium, gallium, zirconium, chromium, copper, the percentage by weight of each component is: boron 1.0%, silicon 3%, vanadium 1.5%, gallium 0.3%, zirconium 0.1%, chromium 0.2%, copper 3%, neodymium 20%, cerium 0.5%, dysprosium 2%, ytterbium 1.5%, surplus is iron and inevitable impurity; Preparation method is with embodiment 1.
Comparative example 2:
A kind of corrosion-resistant high-performance rare-earth permanent magnet material, comprise rare earth element, iron, boron, tungsten, silicon, vanadium, zirconium, chromium, copper, the percentage by weight of each component is: boron 1.0%, tungsten 0.1%, silicon 3%, vanadium 1.5%, zirconium 0.1%, chromium 0.2%, copper 3%, neodymium 20%, cerium 0.5%, dysprosium 2%, ytterbium 1.5%, surplus is iron and inevitable impurity; Preparation method is with embodiment 1.
Comparative example 3:
A kind of corrosion-resistant high-performance rare-earth permanent magnet material, comprise rare earth element, iron, boron, tungsten, silicon, vanadium, gallium, zirconium, copper, the percentage by weight of each component is: boron 1.0%, tungsten 0.1%, silicon 3%, vanadium 1.5%, gallium 0.3%, zirconium 0.1%, copper 3%, neodymium 20%, cerium 0.5%, dysprosium 2%, ytterbium 1.5%, surplus is iron and inevitable impurity; Preparation method is with embodiment 1.
Comparative example 4:
A kind of corrosion-resistant high-performance rare-earth permanent magnet material, comprise rare earth element, iron, boron, tungsten, silicon, vanadium, gallium, zirconium, chromium, copper, the percentage by weight of each component is: boron 1.0%, tungsten 0.1%, silicon 3%, vanadium 1.5%, gallium 0.3%, zirconium 0.1%, chromium 0.2%, copper 3%, neodymium 20%, dysprosium 2.5%, ytterbium 1.5%, surplus is iron and inevitable impurity; Preparation method is with embodiment 1.
Comparative example 5:
A kind of corrosion-resistant high-performance rare-earth permanent magnet material, comprise rare earth element, iron, boron, tungsten, silicon, vanadium, gallium, zirconium, chromium, copper, the percentage by weight of each component is: boron 1.0%, tungsten 0.1%, silicon 3%, vanadium 1.5%, gallium 0.3%, zirconium 0.1%, chromium 0.2%, copper 3%, neodymium 20%, cerium 0.5%, dysprosium 3.5%, surplus is iron and inevitable impurity; Preparation method is with embodiment 1.
Embodiment 4: the Performance Detection of the corrosion-resistant high-performance rare-earth permanent magnet material of the present invention
The permanent magnetic material different temperatures curve measurement system NIM200C of China National Measuring Science Research Inst. and universal testing machine CMT51505 is adopted to measure the magnetic property of embodiment 1-3 and reference examples 1-5 and mechanical property, PCT is adopted to test (temperature 125 DEG C, 100%RH, 0.25MPa, time 100h) measure weightlessness, to detect decay resistance of the present invention.The results are shown in Table 1.
The performance of table 1 rare earth permanent-magnetic material of the present invention
| Weightless mg/cm 2 | (BH) max(MGOe) | H cj(kOe) | Bending strength (MPa) | |
| Embodiment 1 | 0.23 | 38.91 | 29.78 | 390.06 |
| Embodiment 2 | 0.21 | 38.63 | 29.56 | 389.83 |
| Embodiment 3 | 0.20 | 38.72 | 29.87 | 389.51 |
| Comparative example 1 | 0.64 | 33.81 | 28.38 | 323.24 |
| Comparative example 2 | 0.56 | 33.43 | 21.14 | 317.32 |
| Comparative example 3 | 0.45 | 37.13 | 26.77 | 310.25 |
| Comparative example 4 | 0.29 | 34.12 | 22.19 | 342.83 |
| Comparative example 5 | 0.30 | 32.36 | 23.89 | 367.95 |
As can be drawn from Table 1, rare earth permanent-magnetic material of the present invention improve corrosion-resistant high performance while, there is higher coercive force and bending strength, and stable magnetic energy product (BH)
max; Each component of the present invention is worked in coordination with mutually, indispensable, after comparative example 1-3 omits tungsten, gallium, chromium respectively, and decay resistance, coercive force H
cjand bending strength all can decline; Adopt the rare earth element of the combination of neodymium, cerium, dysprosium and ytterbium also can improve decay resistance, coercive force and bending strength, and comparative example 4-5 prove that eliminating certain rare earth element can make decay resistance, coercive force and bending strength decline.
Claims (7)
1. a corrosion-resistant high-performance rare-earth permanent magnet material, comprise rare earth element, iron, boron, tungsten, silicon, vanadium, gallium, zirconium, chromium, copper, the percentage by weight of each component is: rare earth element 20-35%, boron 0.8-1.5%, tungsten 0.02-0.2%, silicon 0.5-5%, vanadium 0.1-3%, gallium 0.02-0.5%, zirconium 0.02-0.5%, chromium 0.02-0.5%, copper 0.5-5%, surplus is iron and inevitable impurity.
2. the corrosion-resistant high-performance rare-earth permanent magnet material of one according to claim 1, its rare earth elements is the combination of neodymium, cerium, dysprosium and ytterbium.
3. the corrosion-resistant high-performance rare-earth permanent magnet material of one according to claim 2, wherein the weight ratio of neodymium, cerium, dysprosium and ytterbium is 20:0.5:2:1.5.
4. the corrosion-resistant high-performance rare-earth permanent magnet material of the one according to claim 1-3, comprises rare earth element, iron, boron, tungsten, silicon, vanadium, gallium, zirconium, chromium, copper, and the percentage by weight of each component is: boron 1.0%, tungsten 0.1%, silicon 3%, vanadium 1.5%, gallium 0.3%, zirconium 0.1%, chromium 0.2%, copper 3%, neodymium 20%, cerium 0.5%, dysprosium 2%, ytterbium 1.5%, surplus is iron and inevitable impurity.
5. the corrosion-resistant high-performance rare-earth permanent magnet material of the one according to claim 1-3, comprises rare earth element, iron, boron, tungsten, silicon, vanadium, gallium, zirconium, chromium, copper, and the percentage by weight of each component is: boron 1.2%, tungsten 0.14%, silicon 2%, vanadium 2%, gallium 0.15%, zirconium 0.3%, chromium 0.4%, copper 2%, neodymium 24%, cerium 0.6%, dysprosium 2.4%, ytterbium 1.8%, surplus is iron and inevitable impurity.
6. the corrosion-resistant high-performance rare-earth permanent magnet material of the one according to claim 1-3, comprises rare earth element, iron, boron, tungsten, silicon, vanadium, gallium, zirconium, chromium, copper, and the percentage by weight of each component is: boron 1.4%, tungsten 0.06%, silicon 1%, vanadium 2.5%, gallium 0.45%, zirconium 0.4%, chromium 0.1%, copper 4.5%, neodymium 28%, cerium 0.7%, dysprosium 2.8%, ytterbium 2.1%, surplus is iron and inevitable impurity.
7. a preparation method for the corrosion-resistant high-performance rare-earth permanent magnet material described in any one of claim 1-6, comprises the following steps:
(1) raw material prepare: prepared burden by weight ratio by the raw material removed through surface;
(2) ingot casting: raw material is added in smelting furnace, vacuumize, and under 0.05MPa argon shield, carry out melting and be cast into ingot, then ingot casting is put Homogenization Treatments in a vacuum furnace, the temperature of described process is 900-960 DEG C, and the time is 8-10 hour;
(3) powder process: the ingot casting of Homogenization Treatments is carried out hydrogen fragmentation, to the alloy powder of 200-250 μm, then carries out Dehydroepiandrosterone derivative;
(4) pressing under magnetic field: above-mentioned magnetic is placed on orientation in the magnetic field of 1.2T-2.0T, compressing with the pressure of 10MPa-20MPa;
(5) sinter: sinter in vacuum air-quenching furnace, sintering temperature is 1100-1180 DEG C, and sintering time is 4-5 hour;
(6) Ageing Treatment: the magnet sintered is carried out double tempering heat treatment, tempering heat treatment temperature is 900-1000 DEG C for the first time, and the time is 4-5 hour, and second time tempering heat treatment temperature is 400-600 DEG C, and the time is 7-9 hour;
(7) magnetize, the magnet prepared is magnetized again, to obtain final product through above-mentioned steps.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510941590.2A CN105374487A (en) | 2015-12-16 | 2015-12-16 | Corrosion-resistant high-performance rare earth permanent magnet material |
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