CN104505207B - Big L/D ratio radial hot pressing permanent-magnetic clamp and preparation method thereof - Google Patents
Big L/D ratio radial hot pressing permanent-magnetic clamp and preparation method thereof Download PDFInfo
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- CN104505207B CN104505207B CN201410776421.3A CN201410776421A CN104505207B CN 104505207 B CN104505207 B CN 104505207B CN 201410776421 A CN201410776421 A CN 201410776421A CN 104505207 B CN104505207 B CN 104505207B
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Abstract
The invention belongs to the preparation field of permanent-magnet material, more particularly to a kind of big L/D ratio radial hot pressing permanent-magnet alloy ring and preparation method thereof, the permanent-magnetic clamp is by weight percentage in the chemical composition of use state：The mass percent that RE accounts for total metal in rare earth metal RE, RE ' sums 26~35%, rare earth metal is 18~26%, B 0.7~1.1%, TM 0.5~5%, and remaining is Fe；Wherein RE is Nd and/or Pr, RE ' are one or more rare earth elements in Y, La, Ce, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu；TM is one or more transition elements in Co, Ni, Mn, Cr, Al, Sn, Ga, Ti, Zn, Zr, Mo, Ag, W, Nb and Cu；The permanent-magnetic clamp has 2 14 1 type RE permanent magnetic alloy phases；The magnetic energy product of the permanent-magnetic clamp is more than 40MGOe, and draw ratio is 1~5.Compared with magnet ring of the draw ratio less than 1 prepared by traditional reverse hot extrusion, time and materials are saved, production cost is greatly reduced, available for equipment such as high energy efficiency motor and high speed engines.
Description
Technical field
The invention belongs to the manufacture field of rare earth permanent-magnetic material, more particularly to a kind of low cost, high-performance, big L/D ratio,
Hot pressing permanent-magnetic clamp of radial orientation and preparation method thereof.
Background technology
At present, the preparation method of permanent-magnetic clamp mainly has permanent magnet to splice permanent-magnetic clamp, isotropism bonded permanent magnet ring, radial take
To sintering permanent magnet ring, reverse hot extrusion permanent-magnetic clamp.Easily there is Magnetic field inhomogeneity in stitching portion in splicing permanent-magnetic clamp；Isotropism is bonded
Permanent-magnetic clamp is isotropism and density is relatively low, therefore magnetic property is relatively low, and magnetic energy product scope is 6~10MGOe；Using powder metallurgy
Radial orientation sintering permanent magnet ring prepared by method, due to the limitation of alignment magnetic field, the size of magnet ring is extremely restricted, it is difficult to real
Existing high wall, the preparation of thin-walled magnet ring, simultaneously because largely being shunk during powder metallurgy sintered, prevent magnet ring from newly net forming,
Add the subsequent machining cost of magnet ring；Reverse hot extrusion permanent-magnetic clamp have excellent magnetic property, newly net forming, can be made it is thin
The advantages of wall pieces, but to be typically not greater than two ends performance after 30mm, shaping extremely uneven, it is necessary to remove for its length, causes production
The unnecessary raising of cost.The technique and product for once preparing overlength magnet ring of the draw ratio more than or equal to 1 in the prior art are (long
Footpath is than referring to the length of permanent-magnetic clamp and the ratio of overall diameter), have not been reported so far.
The content of the invention
In view of the above-mentioned problems, the invention provides a kind of low cost, high-performance, (i.e. draw ratio is more than or equal to big L/D ratio
1) radial hot pressing permanent-magnetic clamp and preparation method thereof.
To achieve the above object, technical scheme is as follows：
A kind of big L/D ratio radial hot pressing permanent-magnetic clamp, the permanent-magnetic clamp use state chemical composition by weight percentage
For：The mass percent that RE accounts for total metal in rare earth metal RE, RE ' sums 26~35%, rare earth metal is 18~26%, B
0.7~1.1%, TM 0.5~5%, remaining is Fe；Wherein RE be Nd and/or Pr, RE ' be selected from Y, La, Ce, Sm, Eu, Gd,
One or more rare earth elements in Tb, Dy, Ho, Er, Tm, Yb, Lu；TM be selected from Co, Ni, Mn, Cr, Al, Sn, Ga, Ti,
One or more transition elements in Zn, Zr, Mo, Ag, W, Nb and Cu；The permanent-magnetic clamp has 2-14-1 type RE permanent magnetic alloys
Phase；
The permanent-magnetic clamp is prepared using following technique：It is each that fast quenching prepares rare earth-Fe-B amorphous nano-crystallines strip → be broken into magnetic
It is micro- with shred crystalline substance to same sex rare earth-Fe-B magnetics → be hot pressed into theoretical density isotropism magnet ring → forward direction hot extrusion molding
The permanent-magnetic ring of radial orientation of tissue.
The RE ' is preferably one or more rare earth elements in Dy, Y, Ce, Sm, Ho；
The TM is preferably one or more transition elements in Nb, Ga, Al, Cu, Co, Mn, Cr, Ti, Zn.
In the hot pressing, gland 3 is moved downward in hot pressing, is compacted magnetic and is produced metallurgical binding.
In positive hot extrusion process, when gland 8 is moved down in hot extrusion, isotropism magnet ring flows downwards
Become, obtain the permanent-magnetic clamp of radial orientation.
The magnetic energy product of the permanent-magnetic clamp is more than 40MGOe, and coercivity is more than 11.15kOe, and remanent magnetism is more than 11.3kGs, draw ratio
For 1~5.
It is complete crystalline state to prepare the powder that the amorphous nano-crystalline rapid tempering belt of the permanent-magnetic clamp is made, or comprising part amorphous state,
Crystallite dimension is less than 100nm, and the particle diameter of powder particle is 0.2~2mm.
A kind of preparation method of big L/D ratio radial hot pressing permanent-magnetic clamp, this method comprises the following steps：
A) the fast quenching amorphous nano-crystalline thin ribbons of rare earth-Fe-B are prepared：Alloyage raw material is matched by alloying component, rare earth Nd is fitted
Work as excess, to offset smelting scaling loss, smelting ingot casting is carried out to alloy raw material, remelted fast quenching obtains rare earth-Fe-B amorphous nanos
Brilliant strip；
B) magnetic isotropy rare earth-Fe-B magnetics are prepared：The fast quenching amorphous nano-crystalline thin ribbons of rare earth-Fe-B are crushed magnetic is made
Isotropism rare earth-Fe-B magnetics；
C) hot pressing：By rare earth-Fe-B magnetics, hot pressing turns into theoretical density isotropism annular magnet under argon gas protection；
D) hot extrusion：It is micro- with shred crystalline substance by the positive hot extrusion molding of obtained theoretical density isotropism annular magnet
Tissue, big L/D ratio, the hot pressing rare earth-Fe-B permanent-magnetic clamps of radial orientation.
In step a, melting temperature is 1350~1390 DEG C.
In step c, gland 3 is moved downward in hot pressing, is compacted magnetic and is produced metallurgical binding；Vacuum is higher than 1 × 10- 2Pa, hot pressing temperature is 500~600 DEG C, and hot pressing pressure is 200~250MPa, and the heat-insulation pressure keeping time is 1~2min.
In step d, when gland 8 is moved down in hot extrusion, rheology occurs downwards for isotropism magnet ring；Vacuum is higher than 1
×10-2Pa, extrusion temperature is 850~950 DEG C.
The beneficial effects of the present invention are：
The present invention uses forward extrusion and large deformation ratio, can once prepare the overlength magnet ring that draw ratio is more than or equal to 1,
The maximum feature of the preparation method is that the permanent-magnet alloy ring magnetic uniformity prepared is very excellent, is prepared with traditional reverse hot extrusion
Magnet ring of the draw ratio less than 1 compare, greatly reduce production cost, for high-performance permanent magnet ring extensive use have very
Significance.
The present invention prepares theoretical density magnet using hot pressing/thermal deformation, by positive hot extrusion technique, utilizes nanocrystalline fast quenching
Strip, prepares big L/D ratio, theoretical density, the highly-textured radial magnet rings of rare earth-Fe-B, while reduction production cost, keeps high
Magnetic property.
Brief description of the drawings
Hot-die used in the big L/D ratio radial hot pressing permanent-magnetic clamp preparation method step c for the present invention Fig. 1 is signed an undertaking figure.
Fig. 2 a sign an undertaking for hot extruding die used in the big L/D ratio radial hot pressing permanent-magnetic clamp preparation method step d of the present invention
Composition (when hot extrusion starts).
Fig. 2 b sign an undertaking for hot extruding die used in the big L/D ratio radial hot pressing permanent-magnetic clamp preparation method step d of the present invention
Composition (when hot extrusion is completed).
Reference
The hot pressing core bar of 1 hot pressing die sleeve 2
The hot pressing raw material powder of gland 4 in 3 hot pressing
Mould under the hot pressing of 5 hot pressing packing ring 6
Gland in the hot extrusion of 7 hot extrusion core bar 8
The hot extrusion raw material blank of 9 hot extrusion die sleeve 10
The hot extrusion lower die-sleeve of 11 hot extrusion die cavity 12
Magnet ring after the hot extrusion of 13 hot extrusion packing ring 14
Embodiment
With reference to the accompanying drawings and examples, the embodiment to the present invention is described in further detail.
The principle of the present invention is：It is excellent that hot pressing/thermal deformation rare earth-Fe-B permanent magnets do not need magnetic field orientating to be obtained with
Different crystal orientation, its formation mechenism be isotropic Re-Fe-B magnets after hot pressing in thermal deformation process, due to
RE2Fe14The preferential growth of crystal grain and pass through border liquid phase institute in the rotation of B Grain Boundary Sliding, crystal grain, forming core and recrystallization process
The grain sliding of promotion and rotation, make RE2Fe14B magnetic principal phase directions of easy axis form excellent crystal perpendicular to rheology direction
Orientation, increases substantially remanent magnetism and magnetic energy product.Therefore, radial permanent magnetic ring can be prepared using hot pressing/thermal deformation technology.
The low cost of the present invention, high-performance big L/D ratio radial hot pressing permanent-magnetic clamp permanent-magnetic clamp use state it is chemical into
Divide and be by weight percentage：RE accounts for the mass percent of total metal in rare earth metal RE, RE ' sums 26~35%, rare earth metal
For 18~26%, B 0.7~1.1%, TM 0.5~5%, remaining is Fe；Wherein RE be Nd and/or Pr, RE ' be selected from Y, La,
One or more rare earth elements in Ce, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu；TM be selected from Co, Ni, Mn, Cr,
One or more transition elements in Al, Sn, Ga, Ti, Zn, Zr, Mo, Ag, W, Nb and Cu；The permanent-magnetic clamp has 2-14-1 types
RE permanent magnetic alloy phase.The magnetic energy product of the permanent-magnetic clamp is more than 40MGOe, draw ratio 1~5.
Above-mentioned low cost, the preparation technology flow of high-performance big L/D ratio radial hot pressing permanent-magnetic clamp include preparing rare earth-Fe-
The fast quenching amorphous nanogold strips of B → prepare magnetic isotropy rare earth-Fe-B alloy powders → hot pressing → hot extrusion.
Low cost, the preparation method of high-performance big L/D ratio radial hot pressing rare earth-Fe-B permanent-magnetic clamps of the present invention, including such as
Lower step：
A) the fast quenching amorphous nanogold strips of rare earth-Fe-B are prepared：Alloyage raw material is matched by alloying component, to alloyed powder
It is last further to smelt, and on 1350-1390 DEG C of molten alloy, the water-cooled copper roller for then spraying rotation, obtain rare earth-Fe-B fast
Quench amorphous nano-crystalline strip, be complete crystalline state, or comprising part amorphous state, crystallite dimension is less than 100nm；
B) magnetic isotropy rare earth-Fe-B alloy powders are prepared：Magnetic is made in the fast quenching amorphous nano-crystalline thin ribbons of rare earth-Fe-B
Isotropism rare earth-Fe-B magnetics, the particle diameter of magnetic powder particle is 0.2~2mm；
C) hot pressing：With the mould shown in Fig. 1, the wherein top of raw material powder 4 is gland 3 in hot pressing, and lower section is hot pressing packing ring 5,
By rare earth-Fe-B alloy powders, hot pressing turns into theoretical density isotropism annular magnet under argon gas protection, wherein, vacuum is higher than
1×10-2Pa, hot pressing temperature is 500~600 DEG C, and hot pressing pressure is 200-250MPa, and the heat-insulation pressure keeping time is 1-2min；Institute
State in hot pressing, gland 3 is moved downward in hot pressing, be compacted magnetic and produce metallurgical binding.
D) hot extrusion：The theoretical density isotropism annular magnet is placed in the mould shown in Fig. 2 a, the lower section of raw material powder 4 is removed
Hot pressing packing ring 5, there is hot extrusion die cavity 11 between hot extrusion lower die-sleeve 12 and hot extrusion core bar 7, vacuum higher than 1 ×
10-2Pa argon gas protects lower 850~950 DEG C of forward extrusions to be thermoformed into big L/D ratio radial hot pressing rare earth-Fe-B permanent-magnetic clamps, hot extrusion
After the completion of pressure as shown in Figure 2 b；In positive hot extrusion process, when gland 8 is moved down in hot extrusion, isotropism magnet ring
Rheology occurs downwards, into hot extrusion die cavity 11, the permanent-magnetic clamp of the radial orientation of shape needed for obtaining.
Embodiment 1
The low cost of embodiment 1, high-performance, big L/D ratio, radial hot pressing permanent-magnetic clamp its chemical composition are by weight percentage
For：B 0.7%；Nd 26% in rare earth metal RE, RE ' sums 26%, RE, RE ' are that 0, TM is Al, Cu, Co, wherein Al
0.5%th, Cu 0.6% and Co 0.9%；Remaining is Fe.
Low cost, the preparation method of high-performance big L/D ratio radial hot pressing rare earth-Fe-B permanent-magnetic clamps of embodiment 1, including
Following steps：
A) the fast quenching amorphous nanogold strips of rare earth-Fe-B are prepared：Alloyage raw material is matched by alloying component, to alloyed powder
It is last further to smelt, and the acquisition fast quenching amorphous nano-crystalline thins of rare earth-Fe-B on 1350 DEG C of molten alloys, the water-cooled copper roller of rotation
Band；
B) magnetic isotropy rare earth-Fe-B alloy powders are prepared：Magnetic is made in the fast quenching amorphous nano-crystalline thin ribbons of rare earth-Fe-B
Isotropism rare-earth-iron-boron alloy powder, average grain size is 50nm, and the particle diameter of powder is 0.2-2mm；
C) hot pressing：In vacuum 1 × 10-2Pa, 500 DEG C of hot pressing temperature, hot pressing pressure are 200MPa, heat-insulation pressure keeping 1min bars
Under part, the hot pressing of the rare earth-Fe-B alloy powders is turned into theoretical density isotropism annular magnet；
D) hot extrusion：By the theoretical density isotropism annular magnet in vacuum 5 × 10-3850 DEG C of forward extrusions of Pa heat into
Type is big L/D ratio radial hot pressing rare earth-Fe-B magnet rings.
Under above-mentioned preparation process condition, the magnetic energy product 46MGsOe of prepared permanent-magnet alloy ring, draw ratio is 1, coercive
Power is 12.6kOe, and remanent magnetism is 13.35kGs.
Embodiment 2
The low cost of embodiment 2, high-performance big L/D ratio radial hot pressing permanent-magnetic clamp its chemical composition are by weight percentage：
B 1.1%；The middle Dy 0.6% of Nd 12% in rare earth metal RE, RE ' sums 30%, RE, Pr 6%, RE ', Y 2.4%, Ce
3% and Sm 6%；TM be Nb, Ga, wherein Nb 0.1%, Ga 0.4%, remaining is Fe.
Low cost, the preparation method of high-performance big L/D ratio radial hot pressing rare earth-Fe-B permanent-magnetic clamps of embodiment 2, including
Following steps：
A) the fast quenching amorphous nanogold strips of rare earth-Fe-B are prepared：Alloyage raw material is matched by alloying component, to alloyed powder
It is last further to smelt, and the acquisition fast quenching amorphous nano-crystalline thins of rare earth-Fe-B on 1390 DEG C of molten alloys, the water-cooled copper roller of rotation
Band；
B) magnetic isotropy rare earth-Fe-B alloy powders are prepared：Magnetic is made in the fast quenching amorphous nano-crystalline thin ribbons of rare earth-Fe-B
Isotropism rare-earth-iron-boron alloy powder, average grain size is 72nm, and the particle diameter of powder is 0.2-2mm；
C) hot pressing：In vacuum 1 × 10-2Pa, 600 DEG C of hot pressing temperature, hot pressing pressure are 250MPa, heat-insulation pressure keeping 1min bars
Under part, the hot pressing of the rare earth-Fe-B alloy powders is turned into theoretical density isotropism annular magnet；
D) hot extrusion：By the theoretical density isotropism annular magnet in vacuum 2 × 10-3The lower 900 DEG C of forward extrusion heat of Pa
It is shaped to big L/D ratio radial hot pressing rare earth-Fe-B magnet rings.
Under above-mentioned preparation process condition, the magnetic energy product 45.8MGsOe of prepared permanent-magnet alloy ring, draw ratio is 2, is rectified
Stupid power is 11.15kOe, and remanent magnetism is 14.01kGs.
Embodiment 3
The low cost of embodiment 3, high-performance big L/D ratio radial hot pressing permanent-magnetic clamp its chemical composition are by weight percentage：
B 1%；Nd 21% in rare earth metal RE, RE ' sums 35%, RE, RE ' middle Dy 0.7%, Y 2.8%, Ce 3.5%, Sm
7%；TM is Nb, Cu, Mn, Ga, wherein Nb 0.5%, Cu 0.5%, Mn 1%, Co 2.6% and Ga 0.4%；Remaining is Fe.
Low cost, the preparation method of high-performance big L/D ratio radial hot pressing rare earth-Fe-B permanent-magnetic clamps of embodiment 3, including
Following steps：
A) the fast quenching amorphous nanogold strips of rare earth-Fe-B are prepared：Alloyage raw material is matched by alloying component, to alloyed powder
It is last further to smelt, and in 1380 DEG C of molten alloys, be then ejected into the water-cooled copper roller of rotation, obtain rare earth-Fe-B fast quenchings
Amorphous nano-crystalline strip；
B) magnetic isotropy rare earth-Fe-B alloy powders are prepared：Magnetic is made in the fast quenching amorphous nano-crystalline thin ribbons of rare earth-Fe-B
Isotropism rare-earth-iron-boron alloy powder, average grain size is 58nm, and the particle diameter of powder is 0.2~2mm；
C) hot pressing：In vacuum 1 × 10-2Pa, 600 DEG C of hot pressing temperature, hot pressing pressure are 200MPa, heat-insulation pressure keeping 1min bars
Under part, the hot pressing of the rare earth-Fe-B alloy powders is turned into theoretical density isotropism annular magnet；
D) hot extrusion：By the theoretical density isotropism annular magnet in vacuum 1 × 10-2The lower 950 DEG C of forward extrusion heat of Pa
It is shaped to big L/D ratio radial hot pressing rare earth-Fe-B magnet rings.
Under above-mentioned preparation process condition, the magnetic energy product 48MGsOe of prepared permanent-magnet alloy ring, draw ratio is 5, coercive
Power is 11.2kOe, and remanent magnetism is 14.1kGs.
Embodiment 4
The low cost of embodiment 4, high-performance big L/D ratio radial hot pressing permanent-magnetic clamp its chemical composition are by weight percentage：
B 1%；The middle Dy 0.3% of Nd 24% in rare earth metal RE, RE ' sums 30%, wherein RE, RE ', Y 2.7% and Ho 3%；
TM is Cr, Al, Ti, Zn, wherein Cr 0.5%, Al 0.5%, Ti 1% and Zn 2%；Remaining is Fe.
Low cost, the preparation method of high-performance big L/D ratio radial hot pressing rare earth-Fe-B permanent-magnetic clamps of embodiment 4, including
Following steps：
A) the fast quenching amorphous nanogold strips of rare earth-Fe-B are prepared：Alloyage raw material is matched by alloying component, to alloyed powder
It is last further to smelt, and in 1390 DEG C of molten alloys, be then ejected into the water-cooled copper roller of rotation, obtain rare earth-Fe-B fast quenchings
Amorphous nano-crystalline strip；
B) magnetic isotropy rare earth-Fe-B alloy powders are prepared：Magnetic is made in the fast quenching amorphous nano-crystalline thin ribbons of rare earth-Fe-B
Isotropism rare-earth-iron-boron alloy powder, average grain size is 80nm, and the particle diameter of powder is 0.2~2mm；
C) hot pressing：In vacuum 1 × 10-2Pa, 550 DEG C of hot pressing temperature, hot pressing pressure are 200MPa, heat-insulation pressure keeping 2min bars
Under part, the hot pressing of the rare earth-Fe-B alloy powders is turned into theoretical density isotropism annular magnet；
D) hot extrusion：By the theoretical density isotropism annular magnet in vacuum 1 × 10-2Pa lower 850 DEG C of forward extrusions heat into
Type is big L/D ratio radial hot pressing rare earth-Fe-B magnet rings.
Under above-mentioned preparation process condition, the magnetic energy product 45MGsOe of prepared permanent-magnet alloy ring, draw ratio is 3, coercive
Power is 12.1kOe, and remanent magnetism is 11.3kGs.
Claims (10)
1. a kind of big L/D ratio radial hot pressing permanent-magnetic clamp, it is characterised in that：
The permanent-magnetic clamp is by weight percentage in the chemical composition of use state：Rare earth metal RE, RE ' sums 26 ~ 35%, rare earth
The mass percent that RE accounts for total metal in metal is 18 ~ 26%, B 0.7 ~ 1.1%, TM 0.5 ~ 5%, and remaining is Fe；Wherein RE is Nd
And/or Pr, RE ' are one or more rare earth elements in Y, La, Ce, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu；
TM is one or more transition elements in Co, Ni, Mn, Cr, Al, Sn, Ga, Ti, Zn, Zr, Mo, Ag, W, Nb and Cu；
The permanent-magnetic clamp has 2-14-1 type RE permanent magnetic alloy phases；
The permanent-magnetic clamp is prepared using following technique：It is each to same that fast quenching prepares rare earth-Fe-B amorphous nano-crystallines strip → be broken into magnetic
Property rare earth-Fe-B magnetics → be hot pressed into theoretical density isotropism magnet ring → forward direction hot extrusion molding be with the brilliant microscopic structure of shred
Permanent-magnetic ring of radial orientation；
Wherein, the draw ratio of the permanent-magnetic clamp is 1 ~ 5.
2. big L/D ratio radial hot pressing permanent-magnetic clamp as claimed in claim 1, it is characterised in that：
The RE ' is one or more rare earth elements in Dy, Y, Ce, Sm, Ho；
The TM is one or more transition elements in Nb, Ga, Al, Cu, Co, Mn, Cr, Ti, Zn.
3. big L/D ratio radial hot pressing permanent-magnetic clamp as claimed in claim 1, it is characterised in that：
In the hot pressing, gland in hot pressing（3）Move downward, be compacted magnetic and produce metallurgical binding.
4. big L/D ratio radial hot pressing permanent-magnetic clamp as claimed in claim 1, it is characterised in that：
In positive hot extrusion process, when gland in hot extrusion（8）When moving down, rheology occurs downwards for isotropism magnet ring,
Obtain the permanent-magnetic clamp of radial orientation.
5. big L/D ratio radial hot pressing permanent-magnetic clamp as claimed in claim 1, it is characterised in that：
The magnetic energy product of the permanent-magnetic clamp is more than 40MGOe, and coercivity is more than 11.15kOe, and remanent magnetism is more than 11.3kGs.
6. big L/D ratio radial hot pressing permanent-magnetic clamp as claimed in claim 1, it is characterised in that：
It is complete crystalline state to prepare the powder that the amorphous nano-crystalline rapid tempering belt of the permanent-magnetic clamp is made, or includes part amorphous state, crystal grain
Size is less than 100nm, and the particle diameter of powder particle is 0.2 ~ 2mm.
7. a kind of preparation method of big L/D ratio radial hot pressing permanent-magnetic clamp as claimed in claim 1, it is characterised in that：This method
Comprise the following steps：
a）Prepare the fast quenching amorphous nano-crystalline thin ribbons of rare earth-Fe-B：Alloyage raw material, the appropriate mistake of rare earth Nd are matched by alloying component
Amount, to offset smelting scaling loss, smelting ingot casting is carried out to alloy raw material, it is thin that remelted fast quenching obtains rare earth-Fe-B amorphous nano-crystallines
Band；
b）Prepare magnetic isotropy rare earth-Fe-B magnetics：By the fast quenching amorphous nano-crystalline thin ribbons of rare earth-Fe-B it is broken be made magnetic it is each to
Same sex rare earth-Fe-B magnetics；
c）Hot pressing：By rare earth-Fe-B magnetics, hot pressing turns into theoretical density isotropism annular magnet under argon gas protection；
d）Hot extrusion：It is brilliant micro- group with shred by the positive hot extrusion molding of obtained theoretical density isotropism annular magnet
Knit, the hot pressing rare earth-Fe-B permanent-magnetic clamps of big L/D ratio, radial orientation；
Wherein, the permanent-magnetic clamp is by weight percentage in the chemical composition of use state：Rare earth metal RE, RE ' sums 26 ~
35%, the mass percent that RE accounts for total metal in rare earth metal is 18 ~ 26%, B 0.7 ~ 1.1%, TM 0.5 ~ 5%, and remaining is Fe；Its
Middle RE is Nd and/or Pr, RE ' are the one or more in Y, La, Ce, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu
Rare earth element；TM is one or more mistakes in Co, Ni, Mn, Cr, Al, Sn, Ga, Ti, Zn, Zr, Mo, Ag, W, Nb and Cu
Cross race's element；The permanent-magnetic clamp has 2-14-1 type RE permanent magnetic alloy phases；
The draw ratio of the permanent-magnetic clamp is 1 ~ 5.
8. the preparation method of big L/D ratio radial hot pressing permanent-magnetic clamp as claimed in claim 7, it is characterised in that：
In step a, melting temperature is 1350 ~ 1390 DEG C.
9. the preparation method of big L/D ratio radial hot pressing permanent-magnetic clamp as claimed in claim 7, it is characterised in that：
In step c, gland in hot pressing（3）Move downward, be compacted magnetic and produce metallurgical binding；Vacuum is higher than 1 × 10- 2Pa, hot pressing temperature is 500 ~ 600 DEG C, and hot pressing pressure is 200 ~ 250MPa, and the heat-insulation pressure keeping time is 1 ~ 2min.
10. the preparation method of big L/D ratio radial hot pressing permanent-magnetic clamp as claimed in claim 7, it is characterised in that：
In step d, gland in hot extrusion（8）When moving down, rheology occurs downwards for isotropism magnet ring；Vacuum higher than 1 ×
10-2Pa, extrusion temperature is 850 ~ 950 DEG C.
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| CN201410776421.3A CN104505207B (en) | 2014-12-15 | 2014-12-15 | Big L/D ratio radial hot pressing permanent-magnetic clamp and preparation method thereof |
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| CN201410776421.3A CN104505207B (en) | 2014-12-15 | 2014-12-15 | Big L/D ratio radial hot pressing permanent-magnetic clamp and preparation method thereof |
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| CN104505207B true CN104505207B (en) | 2017-09-29 |
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| CN109166720A (en) * | 2018-08-22 | 2019-01-08 | 浙江东阳东磁稀土有限公司 | A kind of method of continous way production hot extrusion radiation ring |
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| CN106975752A (en) * | 2016-01-19 | 2017-07-25 | 罗伯特·博世有限公司 | Method, magnet and motor for manufacturing magnet |
| TWI719259B (en) * | 2016-09-23 | 2021-02-21 | 日商日東電工股份有限公司 | Sintered body for forming rare earth sintered magnet and manufacturing method thereof |
| CN110753978B (en) * | 2017-05-19 | 2021-09-28 | 罗伯特·博世有限公司 | Thermally deformable magnet and method for producing same |
| CN107845467B (en) * | 2017-11-16 | 2020-08-21 | 浙江中杭新材料科技有限公司 | Sintered neodymium-iron-boron magnetic steel and preparation method thereof |
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| CN112885550A (en) * | 2021-01-14 | 2021-06-01 | 沈阳新橡树磁性材料有限公司 | Preparation method of high-density cerium-based hot-pressed rare earth magnetic steel |
| CN114334418B (en) * | 2021-12-29 | 2022-10-11 | 钢铁研究总院 | Combined type extrusion forming device and method suitable for neodymium iron boron permanent magnet ring |
| CN114974866B (en) * | 2022-05-09 | 2023-03-14 | 大连理工大学 | Integrated forming die for hot-pressing-hot-deformation rare earth permanent magnet ring and preparation method thereof |
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| US3977918A (en) * | 1975-04-07 | 1976-08-31 | Raytheon Company | Method of making magnets |
| JP2643267B2 (en) * | 1988-03-29 | 1997-08-20 | 大同特殊鋼株式会社 | Method for producing R-Fe-B anisotropic magnet |
| CN101202143B (en) * | 2007-11-09 | 2012-01-11 | 钢铁研究总院 | Preparation method of high performance radial hot pressing magnet ring |
| CN103918041B (en) * | 2011-11-14 | 2017-02-22 | 丰田自动车株式会社 | Rare-earth magnet and process for producing same |
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- 2014-12-15 CN CN201410776421.3A patent/CN104505207B/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109166720A (en) * | 2018-08-22 | 2019-01-08 | 浙江东阳东磁稀土有限公司 | A kind of method of continous way production hot extrusion radiation ring |
| CN109166720B (en) * | 2018-08-22 | 2020-11-13 | 浙江东阳东磁稀土有限公司 | Method for continuously producing hot extrusion radiation ring |
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