CN107895620B - A kind of high Fe content samarium-cobalt permanent-magnetic material and preparation method - Google Patents
A kind of high Fe content samarium-cobalt permanent-magnetic material and preparation method Download PDFInfo
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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
- H01F1/0555—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 pressed, sintered or bonded together
- H01F1/0557—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 pressed, sintered or bonded together sintered
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C1/00—Making non-ferrous alloys
- C22C1/04—Making non-ferrous alloys by powder metallurgy
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C30/02—Alloys containing less than 50% by weight of each constituent containing copper
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Abstract
A kind of high Fe content samarium-cobalt permanent-magnetic material and preparation method, the expression formula of the high Fe content samarium-cobalt permanent-magnetic material are Sm1‑pMp(Co1‑x‑y‑wFexCuyZrw)z, wherein M is at least one of selected element Pr, La, Ce, Nd, Y, Dy, Er, and p=0.02~0.15, x=0.28~0.36, y=0.04~0.08, w=0.015~0.025, z=7.5~8.2, z are magnesium-yttrium-transition metal and rare earth ratio.The present invention uses multistep sintering process, improves high Fe content Sm1‑pMp(Co1‑x‑y‑wFexCuyZrw)zThe squareness of permanent-magnet material solves the problems, such as that iron content increases squareness decline and magnetic property is caused to decline, has achieved the purpose that improve maximum magnetic energy product by improving Fe content.Magnetic property are as follows: remanent magnetism Br=11.18~12.07kGs, maximum magnetic energy product (BH) max=28~34MGOe, squareness Hk/Hcj=0.311~0.504, coercivity H j=21.32~26.94kOe.
Description
Technical field
The present invention relates to technical field of magnetic materials more particularly to a kind of high Fe content samarium-cobalt permanent-magnetic material and preparation sides
Method improves high Fe content samarium-cobalt permanent-magnetic material squareness.
Background technique
Permanent-magnet material as a kind of important functional material, be widely applied to computer technology, that micro- communication technology,
Each key areas such as auto industry, aircraft industry, automatic technology, instrumental technique.2:17 type samarium-cobalt permanent-magnetic material is due to tool
There are high saturation magnetization, high-coercive force, high Curie temperature and good corrosion resistance, so that it becomes in many industries
The optimal selection of permanent-magnet material.With more more and more urgent to clean energy resource demand at present, high-performance needed for wind-driven generator
Permanent magnetism is also increasingly valued by people, and furthermore in aerospace field, high performance magnet means loss of weight, therefore 2:17
Type samarium cobalt permanent magnet has very wide application prospect.
In order to improve the maximum magnetic energy product of samarium-cobalt material, improving its iron content is also a kind of very effective method.But
Deteriorate squareness when iron content is relatively high often so as to cause the decline of magnetic energy product, the purpose of design is not achieved.Squareness is
Therefore structure sensitive factor must also prepare the samarium cobalt permanent magnet of high squareness on the basis of optimizing components by improving technique.
Existing sintering process is mostly once sintered molding, that is, is warming up to a certain temperature and cools down afterwards for a period of time, complete
At sintering process, it is mainly sintered to obtain the higher magnet of density, then carries out subsequent heat treatment.In the present invention, using more
Step sintering, may be implemented higher magnet density, available bigger cell structure is shown in Fig. 2.Fe element is in heat treatment process
Middle to enter in the phase intracellular of 2:17R, big cell structure size could receive more Fe elements, so as to improve magnet
The content of middle iron prepares the samarium-cobalt magnet of high Fe content.
Summary of the invention
The present invention solves the problems, such as: overcoming the problems, such as that existing high Fe content samarium cobalt permanent magnet squareness of holding is very poor, provides a kind of high
Iron content samarium-cobalt permanent-magnetic material and preparation method, to improve high Fe content samarium-cobalt permanent-magnetic material squareness.
To achieve the above object, it has been found that by using step sintering method, i.e., is carried out in the environment of high vacuum short
Then the first sintering of time is sintered 1-2h under argon gas hot environment, when being cooled to certain temperature and being sintered certain again
Between, it may finally reach and improve high Fe content SmCo sintered magnet density increase cell structure size and make microstructure more
Uniformly to improve the purpose of squareness.
The present invention provides a kind of samarium-cobalt permanent-magnetic materials, and the samarium-cobalt permanent-magnetic material iron content is in 20wt% or more, expression
Formula is Sm1-pMp(Co1-x-y-wFexCuyZrw)z, wherein M is at least one of selected element Pr, La, Ce, Nd, Y, Dy, Er, p
=0.01~0.15, q=0.01~0.02, x=0.28~0.32, y=0.04~0.06, w=0.015~0.025, z=7.5
~8.0, z are magnesium-yttrium-transition metal and rare earth ratio, remanent magnetism Br=11.18~12.07kGs, maximum magnetic energy product (BH) max
=28~34MGOe, squareness Hk/Hcj=0.311~0.504, coercivity H j=21.32~26.94kOe.
The preferred Pr of M, p=0.08~0.13, x=0.28~0.33, y=0.04~0.06, w=0.015~
0.025, z=7.6~7.8.
The preferred Pr of M, p=0.1, x=0.30, y=0.06, w=0.02, z=7.7.
The preferred Pr of M, p=0.1, x=0.32, y=0.06, w=0.02, z=7.7.
The preparation method of the samarium-cobalt permanent-magnetic material of high Fe content of the present invention, comprising the following steps:
The first step, melting ingot casting
Target component alloy is configured, target component master alloy is put in vacuum arc melting furnace and is refined to alloy molten solution in uniform
State, current interruption form alloy pig；Overturning alloy pig, melt back 3~5 times, the uniform alloy pig of the ingredient of system.
Second step, powder processed
By Sm obtained1-pMp(Co1-x-y-wFexCuyZrw)zAlloy pig is crushed to by pulverizer can be by the thick of 80 meshes
Then powder obtains the Sm that partial size is 3~5 μm using ball mill or airflow milling1-pMp(Co1-x-y-wFexCuyZrw)zPowder；
Third step, pressing under magnetic field and isostatic cool pressing
Powder after drying is formed in pressing under magnetic field machine, the green body of high-orientation is obtained, then in cold isostatic press
In 200
Pressure maintaining 1h under conditions of MPa, further compacting obtains green compact；
4th step, step sintering and heat treatment
By Sm made from third step1-pMp(Co1-x-y-wFexCuyZrw)zMagnet is put into the burner hearth of vacuum heat treatment furnace, is adjusted
Vacuum degree is saved in vacuum heat treatment furnace to 2 × 10-3~4 × 10-3Pa keeps high vacuum to 1160-1180 DEG C and protects in this temperature
Temperature sintering 15-40min, then passes to high-purity argon gas (argon gas volume fraction is 99.99% or more) to 0.1 × 105~0.3 ×
105Pa is sintered 1-2h at a temperature of 1200-1215 DEG C, is cooled to 1175-1195 DEG C and is sintered 0-4h again, then in 1140-
After 1180 DEG C of solid solutions, Sm is made1-pMp(Co1-x-y-wFexCuyZrw)zAlloy；Then the alloy is put under the protection of argon gas
Enter quenching-in water, being made has TbCu7The SmCo1:7H single-phase alloy of structure；Then under 780~850 DEG C of high temperature heat preservation 8~
12h then slowly cools to 400-500 DEG C with the speed of 0.4~0.7 DEG C/min, is quenched to room temperature after keeping the temperature 8-10h.
The advantages of the present invention over the prior art are that: the Fe content in the present invention is very high；The present invention is by using more
Sintering process is walked, ensure that high squareness while improving Fe content, to be prepared for the high Fe content SmCo of high squareness
Permanent magnetism；High Fe content samarium-cobalt permanent-magnetic material coercivity with higher prepared by the present invention；Samarium-cobalt permanent-magnetic material side of the invention
Shape degree and maximum magnetic energy product are higher, so as to improve big and stable magnetic field, are conducive to the service efficiency for improving material；This
Invention, which improves iron content, can reduce cost, have broad application prospects in new energy industry and aerospace field.
Detailed description of the invention
Fig. 1 is the preparation heat treatment process process of magnet of the present invention；
Fig. 2 is the TEM micro-structure diagram of magnet of the present invention；
Fig. 3 is 1 sample Sm of the embodiment of the present invention0.90Pr0.10(Co0.62Fe0.30Cu0.06Zr0.02)7.7Magnet demagnetization curve；
Fig. 4 is 2 sample Sm of the embodiment of the present invention0.90Pr0.10(Co0.62Fe0.30Cu0.06Zr0.02)7.7Magnet demagnetization curve；
Fig. 5 is 3 sample Sm of the embodiment of the present invention0.90Pr0.10(Co0.62Fe0.30Cu0.06Zr0.02)7.7Magnet demagnetization curve；
Fig. 6 is 4 sample Sm of the embodiment of the present invention0.90Pr0.10(Co0.62Fe0.30Cu0.06Zr0.02)7.7Magnet demagnetization curve；
Fig. 7 is 5 sample Sm of the embodiment of the present invention0.90Pr0.10(Co0.60Fe0.32Cu0.06Zr0.02)7.7Magnet demagnetization curve；
Fig. 8 is 6 sample Sm of the embodiment of the present invention0.90Pr0.10(Co0.60Fe0.32Cu0.06Zr0.02)7.7Magnet demagnetization curve.
Specific embodiment
Below in conjunction with drawings and examples, the present invention is described in further detail.
As shown in Figure 1, a kind of high Fe content samarium-cobalt permanent-magnetic material preparation method of the present invention, includes the following steps:
The first step, melting ingot casting
Target component alloy is configured, target component master alloy is put in vacuum arc melting furnace and is refined to alloy molten solution in uniform
State, current interruption form alloy pig；Overturning alloy pig, melt back 3~5 times, the uniform alloy pig of the ingredient of system.
Step 2: powder processed
By Sm obtained1-pMp(Co1-x-y-wFexCuyZrw)zAlloy pig is crushed to by pulverizer can be by the thick of 80 meshes
Then powder obtains the Sm that partial size is 3~5 μm using ball mill or airflow milling1-pMp(Co1-x-y-wFexCuyZrw)zPowder；
Third step, pressing under magnetic field and isostatic cool pressing
Powder after drying is formed in pressing under magnetic field machine, the green body of high-orientation is obtained, then in cold isostatic press
In 200
Pressure maintaining 1h under conditions of MPa, further compacting obtains green compact；
4th step, step sintering and heat treatment
By Sm made from third step1-pMp(Co1-x-y-wFexCuyZrw)zMagnet is put into the burner hearth of vacuum heat treatment furnace, is adjusted
Vacuum degree is saved in vacuum heat treatment furnace to 2 × 10-3~4 × 10-3Pa keeps high vacuum to 1160-1180 DEG C and protects in this temperature
Temperature sintering 15-40min, then passes to high-purity argon gas to 0.1 × 105~0.3 × 105Pa is sintered at a temperature of 1200-1215 DEG C
1-2h is cooled to 1175-1195 DEG C and is sintered 0-4h again, and then after 1140-1180 DEG C of solid solution, Sm is made1-pMp(Co1-x-y- wFexCuyZrw)zAlloy；Then the alloy is quenched into the water under the protection of argon gas, being made has TbCu7Structure
SmCo1:7H single-phase alloy；Then 8~12h is kept the temperature under 780~850 DEG C of high temperature, then with the speed of 0.4~0.7 DEG C/min
400-500 DEG C is slowly cooled to, room temperature is quenched to after keeping the temperature 8-10h, obtains required sample.
The aging technique of the following example: 810 DEG C of heat preservations slowly cool to 400 DEG C for 24 hours, with the speed of 0.5 DEG C/min, protect
It is quenched to room temperature after warm 10h, obtains required sample.
Embodiment 1: Sm processed0.90Pr0.10(Co0.62Fe0.30Cu0.06Zr0.02)7.7Permanent-magnet material is added without in sintering process
The sintering of three steps
The first step, melting ingot casting
Configuration target component is Sm0.90Pr0.10(Co0.62Fe0.30Cu0.06Zr0.02)7.7Alloy puts target component master alloy
It refines to alloy molten solution in vacuum arc melting furnace in uniform state, current interruption forms alloy pig；Overturn alloy pig, melt back 3~5
It is secondary, the uniform alloy pig of the ingredient of system.
Second step, powder processed
By Sm obtained0.90Pr0.10(Co0.62Fe0.30Cu0.06Zr0.02)7.7Alloy pig is crushed to by pulverizer to be passed through
Then the coarse powder of 80 meshes obtains the Sm that partial size is 3~5 μm using ball mill or airflow milling0.90Pr0.10
(Co0.62Fe0.30Cu0.06Zr0.02)7.7Powder；
Third step, pressing under magnetic field and isostatic cool pressing
Powder after drying is formed in pressing under magnetic field machine, the green body of high-orientation is obtained, then in cold isostatic press
In 200
Pressure maintaining 1h under conditions of MPa, further compacting obtains green compact；
Step 4: step sintering and heat treatment
By Sm made from third step0.90Pr0.10(Co0.62Fe0.30Cu0.06Zr0.02)7.7Permanent-magnet material green compact, at 1180 DEG C
First sintering 20min is carried out under high vacuum environment, is sintered 1h under 1210 DEG C of ar gas environment, in 1170 DEG C of solid solution 4h, is quenched
Fire arrives room temperature, finally carries out timeliness.
It is handled by high temperature sintering solution treatment and secondary time effect, realizes Sm0.90Pr0.10
(Co0.62Fe0.30Cu0.06Zr0.02)7.7The change of magnet microstructure and the Redistribution of element of inside, the average cell prepared by
Cell structure of the diameter in 120nm or so.
The magnetic property of sample is measured with permanent-magnet material measuring system NIM-500C.Its magnetic parameter is as shown in table 1.
1. embodiment of table, 1 sample Sm0.90Pr0.10(Co0.62Fe0.30Cu0.06Zr0.02)7.7Magnetic property
Br (kGs) is remanent magnetism, and Hcj (kOe) is coercivity, and (BH) max (MGOe) is maximum magnetic energy product, and Hk/Hcj is rectangular
Degree, coercivity size when Hk is 0.9Br, similarly hereinafter.
Embodiment 2: Sm processed0.90Pr0.10(Co0.62Fe0.30Cu0.06Zr0.02)7.71h the is added in sintering process for permanent-magnet material
The sintering of three steps.
The present embodiment and the difference of embodiment 1 are only that: being dropped after being sintered 1h under 1210 DEG C of ar gas environment in the 4th step
Temperature is sintered 1h to 1190 DEG C again, carries out fixation rates under the conditions of then same.Obtain target sample.
The magnetic property of sample is measured with permanent-magnet material measuring system NIM-500C.Its magnetic parameter is as shown in table 2.
2. embodiment of table, 2 sample Sm0.90Pr0.10(Co0.62Fe0.30Cu0.06Zr0.02)7.7Magnetic property
Embodiment 3: Sm processed0.90Pr0.10(Co0.62Fe0.30Cu0.06Zr0.02)7.7High temperature permanent magnetic material is added in sintering process
The sintering of 2h third step.
The present embodiment and the difference of embodiment 2 are only that: being dropped after being sintered 1h under 1210 DEG C of ar gas environment in the 4th step
Temperature is sintered 2h to 1190 DEG C again, carries out fixation rates under the conditions of then same.Obtain target sample.
The magnetic property of sample is measured with permanent-magnet material measuring system NIM-500C.Its magnetic parameter is as shown in table 3.
3. embodiment of table, 3 sample Sm0.90Pr0.10(Co0.62Fe0.30Cu0.06Zr0.02)7.7Magnetic property
Embodiment 4: Sm processed0.90Pr0.10(Co0.62Fe0.30Cu0.06Zr0.02)7.7High temperature permanent magnetic material is added in sintering process
The sintering of 4h third step.
The present embodiment and the difference of embodiment 2 are only that: being dropped after being sintered 1h under 1210 DEG C of ar gas environment in the 4th step
Temperature is sintered 4h to 1190 DEG C again, carries out fixation rates under the conditions of then same.Obtain target sample.
The magnetic property of sample is measured with permanent-magnet material measuring system NIM-500C.Its magnetic parameter is as shown in table 4.
4. embodiment of table, 4 sample Sm0.90Pr0.10(Co0.62Fe0.30Cu0.06Zr0.02)7.7Magnetic property
Best multistep sintering process is determined by aforementioned four embodiment, i.e. third time sintering time is 2h, in embodiment 5
With in embodiment 6 by further increasing iron content, it was demonstrated that the preparation process is to improving high Fe content samarium-cobalt permanent-magnetic material side
The applicability of shape degree.
Embodiment 5: Sm processed0.90Pr0.10(Co0.60Fe0.32Cu0.06Zr0.02)7.7High temperature permanent magnetic material is not added in sintering process
Enter third step sintering.
The first step, melting ingot casting
Configuration target component is Sm0.90Pr0.10(Co0.60Fe0.32Cu0.06Zr0.02)7.7Alloy puts target component master alloy
It refines to alloy molten solution in vacuum arc melting furnace in uniform state, current interruption forms alloy pig；Overturn alloy pig, melt back 3~5
It is secondary, the uniform alloy pig of the ingredient of system.
Second step, powder processed
By Sm obtained0.90Pr0.10(Co0.60Fe0.32Cu0.06Zr0.02)7.7Alloy pig is crushed to by pulverizer to be passed through
Then the coarse powder of 80 meshes obtains the powder that partial size is 3~5 μm using ball mill or airflow milling；
Third step, pressing under magnetic field and isostatic cool pressing
Powder after drying is formed in pressing under magnetic field machine, the green body of high-orientation is obtained, then in cold isostatic press
Pressure maintaining 1h under conditions of middle 200MPa, further compacting obtains green compact；
Step 4: step sintering and heat treatment
By Sm made from third step0.90Pr0.10(Co0.60Fe0.32Cu0.06Zr0.02)7.7Permanent-magnet material green compact, at 1175 DEG C
First sintering 25min is carried out under high vacuum environment, is sintered 1h under 1205 DEG C of ar gas environment, in 1155 DEG C of solid solution 4h, is quenched
Fire arrives room temperature, finally carries out timeliness.
It is handled by high temperature sintering solution treatment and secondary time effect, realizes Sm0.90Pr0.10
(Co0.60Fe0.32Cu0.06Zr0.02)7.7The change of magnet microstructure and the Redistribution of element of inside, the average cell prepared by
Cell structure of the diameter in 120nm or so.
The magnetic property of sample is measured with permanent-magnet material measuring system NIM-500C.Its magnetic parameter is as shown in table 5.
5. embodiment of table, 5 sample Sm0.90Pr0.10(Co0.60Fe0.32Cu0.06Zr0.02)7.7Magnetic property
Embodiment 6: Sm processed0.90Pr0.10(Co0.60Fe0.32Cu0.06Zr0.02)7.7High temperature permanent magnetic material is added in sintering process
The sintering of 2h third step.
The present embodiment and the difference of embodiment 5 are only that: being dropped after being sintered 1h under 1205 DEG C of ar gas environment in the 4th step
Temperature is sintered 2h to 1185 DEG C again, carries out fixation rates under the conditions of then same.Obtain target sample.
The magnetic property of sample is measured with permanent-magnet material measuring system NIM-500C.Its magnetic parameter is as shown in table 6.
6. embodiment of table, 6 sample Sm0.90Pr0.10(Co0.60Fe0.32Cu0.06Zr0.02)7.7Magnetic property
By comparison in the present invention, using its squareness of the magnet of two-step sintering method Hk/HcjReachable 50.2% and 50.4%,
61.4% and 35.1%, maximum magnetic energy product (BH) max difference have less been respectively increased using the magnet squareness of two-step sintering method
Improve 10.9% and 6.0%, the very good solution problem of high Fe content samarium-cobalt magnet squareness difference, and magnet coercivity
In 22kOe or more, to provide high-performance and stable magnet provides solution, therefore this preparation method have it is wide
Application prospect.
As shown in figure 3, not being added under conditions of the third step sintering opposing magnetic field Shi Jia, remanent magnetism decline is very fast, the side of causing
Shape degree is very poor, fails to meet the requirements using the high Fe content samarium cobalt permanent magnet body of normal process preparation at this time.
As shown in figure 4, when third step sintering 1h is added, it can be found that the coercivity of magnet increases, and in opposing magnetic field
Middle remanent magnetism decline is slack-off, and squareness increases.
As shown in figure 5, magnet squareness is improved again compared with the third step sintering that 1h is added when third step sintering 2h is added,
And BH line is straight line, at this point, magnet can keep stable in demagnetizing field, squareness improves a lot, and magnet meets at this time
The requirement used.
As shown in fig. 6, the squareness of magnet declines instead, comprehensive magnetic energy when the third step sintering of 4h is added
Deteriorate.
As shown in fig. 7, not using third step to be sintered magnet obtained with demagnetizing field when further increasing iron content
Increase remanent magnetism to be gradually reduced, squareness is lower.
As shown in figure 8, third step sintering 2h is added after improving iron content, in sintering can equally significantly improve the side of magnet
Shape degree, this example demonstrate the applicability of preparation method of the present invention.
It should be noted that those skilled in the art are that this hair may be implemented completely according to the various embodiments described above of the present invention
The content of bright independent claims and the full scope of appurtenance realizes process and the same the various embodiments described above of method, and this hair
Bright do not elaborate partly belongs to techniques well known.
Specific embodiment described in the invention only part specific embodiment of the present invention, but protection scope of the present invention
It is not limited thereto, the variation or replace that any those skilled in the art can readily occur in the technical scope disclosed by the present invention
It changes, should be covered by the protection scope of the present invention.
Claims (2)
1. a kind of high Fe content samarium-cobalt permanent-magnetic material, it is characterised in that: the permanent-magnet material Sm0.90Pr0.10
(Co0.62Fe0.30Cu0.06Zr0.02)7.7Using step sintering method, first sintering is carried out under 1180 DEG C of high vacuum environment
20min is sintered 1h under 1210 DEG C of ar gas environment, is cooled to 1190 DEG C and is sintered 2h again.
2. the preparation method of high Fe content samarium-cobalt permanent-magnetic material as described in claim 1, it is characterised in that: it includes following step
It is rapid:
The first step, melting ingot casting
Configuration target component is Sm0.90Pr0.10(Co0.62Fe0.30Cu0.06Zr0.02)7.7Target component master alloy is put in very by alloy
Empty arc-melting furnace is refined to alloy molten solution in uniform state, and current interruption forms alloy pig；Overturning alloy pig, melt back 3~5 times,
The uniform alloy pig of the ingredient of system；
Second step, powder processed
By Sm obtained0.90Pr0.10(Co0.62Fe0.30Cu0.06Zr0.02)7.7Alloy pig is crushed to by pulverizer can be by 80 mesh
Then the coarse powder of sieve obtains the Sm that partial size is 3~5 μm using ball mill or airflow milling0.90Pr0.10
(Co0.62Fe0.30Cu0.06Zr0.02)7.7Powder；
Third step, pressing under magnetic field and isostatic cool pressing
Powder after drying is formed in pressing under magnetic field machine, the green body of high-orientation is obtained, then in cold isostatic press
Pressure maintaining 1h under conditions of 200MPa, further compacting obtains green compact；
Step 4: step sintering and heat treatment
By Sm made from third step0.90Pr0.10(Co0.62Fe0.30Cu0.06Zr0.02)7.7Permanent-magnet material green compact, in 1180 DEG C of Gao Zhen
First sintering 20min is carried out under Altitude, is sintered 1h under 1210 DEG C of ar gas environment, in 1170 DEG C of solid solution 4h, is quenched into
Room temperature finally carries out timeliness；4th step, which is sintered after 1h under 1210 DEG C of ar gas environment, to be cooled to 1190 DEG C and is sintered 2h again.
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