CN102220538B - Sintered neodymium-iron-boron preparation method capable of improving intrinsic coercivity and anticorrosive performance - Google Patents
Sintered neodymium-iron-boron preparation method capable of improving intrinsic coercivity and anticorrosive performance Download PDFInfo
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Abstract
The invention discloses a sintered neodymium-iron-boron preparation method capable of improving intrinsic coercivity and anticorrosive performance. On the basis of a double-alloy preparation process, Ce-enriched multicomponent rare-based alloy with high amorphous forming ability is used as an auxiliary alloy, and the decrystallizatoin of crystal boundary phase structure is realized by gas quenching cooling in a sintering tempering process. In the invention, the intrinsic coercivity is obviously improved, the anticorrosive weight loss is greatly reduced, the magnetic performance and anticorrosive performance are high, and the method can be widely used in the field of production of high-performance anticorrosive sintered neodymium-iron-boron material.
Description
Technical field
The present invention relates to a kind of sintered NdFeB preparation method, particularly a kind of sintered NdFeB preparation method who improves HCJ and corrosion resistance nature.
Background technology
Sintered NdFeB has the highest saturated magnetic energy product and maximum HCJ in existing permanent magnet material, be widely used in various fields such as electronics, automobile, computer, electric power, machinery, the energy, environmental protection, national defence, medicine equipments.Sintered neodymium iron boron material is prepared from by powder metallurgical technique, and its microstructure comprises that mainly principal phase is (near Nd
2Fe
14The B phase) and rich rare-earth phase consist of (annotate: other has boron-rich phase, when the atomic percent of boron in the sintered NdFeB less than 6.5% the time, this phase can be ignored).Rich rare-earth phase sintering process forms generally is distributed in grain boundaries, has consisted of Grain-Boundary Phase/crystal boundary structure.The main component of rich rare-earth phase is generally the intermetallic compound of rare-earth-iron, and wherein the rare earth atom percentage composition often is higher than 75%.Rich rare-earth phase plays the degaussing exchange-coupling interaction in magnet, be conducive to coercitive raising, because its fusing point is lower than principal phase, also is conducive to the densification of sintering simultaneously.But because the corrosion resistance nature of rich rare-earth phase is relatively poor, also so that the corrosion resistance nature of sintered neodymium iron boron material reduces greatly, limited its application in severe environment.
The main corrosion mechanism of sintered neodymium iron boron material comprises oxidation corrosion and galvanic corrosion.The powder metallurgical technique of sintered neodymium iron boron material has determined that its density is limited, therefore exists a large amount of oxidation corrosion passages at grain boundaries, and easily forms chain reaction, accelerated oxidation after the oxidation.As other metallic substance, exist galvanic corrosion mechanism between the Grain-Boundary Phase of sintered NdFeB and the crystal grain principal phase.For sintered neodymium iron boron material, the corrosion potential of its Grain-Boundary Phase is lower, and volume fraction is little, so the local corrosion galvanic cell of the large negative electrode form of primary anode has brought the larger corrosion electric current density of Grain-Boundary Phase, has accelerated intergranular corrosion and destruction.Therefore, improve the corrosion resistance nature of sintered neodymium iron boron material, key is Grain-Boundary Phase.
Traditionally, modifying Grain-Boundary Phase is by multiple other elements of compound interpolation in material prescription, realizes the reduction of the rich neodymium phase of crystal boundary fusing point.Typically two patent ZL87106209.7 and the ZL91103569.9 such as Sumitomo Special Metal Co., Ltd discloses respectively " production method with rare-earth permanent magnet of excellent corrosion resistance " and " rare-earth permanent magnet with excellent corrosion resistance ", points out that the interpolation of Co, Al element in single alloy prior can effectively improve the corrosion resisting property of rare-earth permanent magnet.Rare-earth permanent magnet over-all properties corresponding to the material prescription that relates in these two patents and production method is lower, does not solve the associated problem of high performance sintered neodymium-iron-boron material erosion resistance.
Pairing gold method is to modify a kind of advanced method of Grain-Boundary Phase, preparation high performance sintered neodymium-iron-boron.Its operational path is to design respectively the composition of main and auxiliary alloy corresponding to principal phase and Grain-Boundary Phase; Control the microstructure of sintered neodymium iron boron material by the ratio of controlling main and auxiliary alloy.By pairing gold method can the optimization design sintered neodymium iron boron material crystal boundary, effectively improve its comprehensive magnetic energy and corrosion resistance nature.In the typical pairing gold process, the composition of auxiliary alloy carries out Composition Design on the rich rare-earth phase basis of the sintered NdFeB of single alloy prior preparation, still contains the multiple elements such as Fe, B that easily cause oxidation corrosion and galvanic corrosion.
In recent years, based on the pairing gold process, the research worker has proposed the preparation method of multiple modification sintered NdFeB Grain-Boundary Phase.Chinese patent ZL200510050000.3 has invented " add nano-silicon nitride in the Grain-Boundary Phase and improve neodymium iron boron working temperature and solidity to corrosion method ", by in the rich rare earth intermetallic compound that consists of Grain-Boundary Phase, adding corrosion resistant nano-si 3 n 4 ceramics particle, reach the effect that reduces corrosion electric current density, improved corrosion resistance nature.But nano-oxide particles does not change the chemical component of rich rare-earth phase intermetallic compound, and its high-melting-point is unfavorable for the subsequent techniques such as liquid phase sintering of sintered NdFeB, therefore addition have to very limited, also comparatively limited for the improvement of corrosion resistance nature.Chinese patent ZL200610053144.9 has invented " preparation method of high corrosion resistance sintered neodymium iron boron ", with sintering behind the NdFeB magnetic powder copper coating, realizes Grain-Boundary Phase to the uniform particles parcel and reaches the degaussing coupling effect.But electroplate granular size obviously greater than the gauge about Grain-Boundary Phase 2-4nm in the desirable microstructure, therefore, electroplate the too much crystal boundary composition of introducing and to cause declining to a great extent of magnetic energy product, particularly saturation magnetization.Chinese patent ZL200610038444.X proposes to utilize non magnetic rare earth based block metal glass (with Nd based on the pairing gold process
65Co
25Al
15Be main body) as auxiliary alloy and in conjunction with the resistance of oxidation of quick process for cooling with the enhancing Grain-Boundary Phase, obtained the lifting of corrosion resistance nature.Yet with Nd
65Co
25Al
15Comparatively limited for the auxiliary alloy glass forming ability of main body, realize that on this basis crystal boundary is decrystallized and the corrosion resistance nature lifting is higher for processing requirement.
Summary of the invention
Technical problem solved by the invention is to provide a kind of sintered NdFeB preparation method who improves HCJ and corrosion resistance nature, it with rich Ce composite multi-component rare earth based alloy with high amorphous formation ability, low melting point, nonferromagnetic as the auxiliary alloy in the pairing gold process, reach the microstructure of improving Sintered NdFeB magnet, improve the effect of sintered neodymium iron boron material HCJ and corrosion resistance nature.
The technical solution that realizes the object of the invention is: a kind of sintered NdFeB preparation method who improves HCJ and corrosion resistance nature may further comprise the steps:
Step 1, preparation neodymium iron boron master alloying is prepared into alloy cast ingot with the neodymium iron boron master alloying or utilizes rapid hardening slab technique to be prepared into slab, carries out homogenizing thermal treatment for alloy cast ingot;
Step 2 is prepared auxiliary alloy, and the atomic percent of auxiliary alloy is (Ce-La-Pr-Nd)
100-x-y-zCo
xAl
yM
z, wherein M is one or both and the above mixing among Ga, Cu, the Nb, 20≤x≤30,5≤y≤15,0≤z≤5, and each rare earth element at the total composition Atom of auxiliary alloy percentage composition is: Ce:25-30%; La:20-25%; Pr:0-5%; Nd:5-15%;
Step 3, the auxiliary alloy of melting obtains auxiliary alloy cast ingot, utilizes melt spinning method technique to be prepared into the rapid hardening thin slice, then carries out crystallization and thermal treatment;
Step 4 is carried out respectively the broken and follow-up dehydrogenation of hydrogen explosion to main and auxiliary alloy and is processed;
Step 5 is mixed main and auxiliary alloy hydrogen flour material, and adds lubricant, antioxidant, gasoline, utilizes airflow milling to grind;
Step 6 after the powder mixing treatment after grinding, places magnetic field vertical orientated, through becoming blank behind magnetic field die mould and the cold isostatic compaction;
Step 7 with the vacuum sintering of die mould blank, is carried out double tempering thermal treatment again, and the cooling of afterwards material gas being quenched obtains having the sintered NdFeB of higher HCJ and high-corrosion resistance.
The present invention compared with prior art, have remarkable advantage: the present invention with rich Ce composite multi-component rare earth based alloy with high amorphous formation ability, low melting point, nonferromagnetic as the auxiliary alloy in the pairing gold process, help not only to realize that non-magnetic Grain-Boundary Phase evenly wraps up the desirable microstructure of neodymium iron boron crystal grain, and it is lower to use this auxiliary alloy to require for the rate of cooling of material sintering tempering process, with gas Grain-Boundary Phase decrystallized that technique can realize material of quenching.The sintered neodymium iron boron material that obtains according to the present invention, its corrosion resistance nature has carried out the acceleration experiment with measuring in environmental laboratory, measure magnet is placed 96h in the environment of 121 ± 2 ℃, 2 normal atmosphere and 100% humidity weightless situation, the result shows the magnet that the present invention obtains, compare with the comparative sample that single alloy comparative sample and the conventional pairing technology for gold of undressed main-phase alloy magnet, identical component obtain, weightlessness significantly reduces.Simultaneously Magnetic Measurement is the result also show, HCJ also significantly improves.The present invention can be widely used in high-coercive force, corrosion-resistant high performance sintered neodymium-iron-boron material preparation.
Below in conjunction with accompanying drawing the present invention is described in further detail.
Description of drawings
Accompanying drawing is the sintered NdFeB preparation method schema of raising HCJ of the present invention and corrosion resistance nature.
Embodiment
By reference to the accompanying drawings, the present invention improves the sintered NdFeB preparation method of HCJ and corrosion resistance nature, may further comprise the steps:
Step 1, preparation neodymium iron boron master alloying is prepared into alloy cast ingot with the neodymium iron boron master alloying or utilizes rapid hardening slab technique to be prepared into slab, carries out homogenizing thermal treatment for alloy cast ingot; Alloy ingot homogenization thermal treatment temp is 950-1150 ℃, and the time is 3-20h.
Step 2 is prepared auxiliary alloy, and the atomic percent of auxiliary alloy is (Ce-La-Pr-Nd)
100-x-y-zCo
xAl
yM
z, wherein M is one or both and the above mixing among Ga, Cu, the Nb, 20≤x≤30,5≤y≤15,0≤z≤5, and each rare earth element at the total composition Atom of auxiliary alloy percentage composition is: Ce:25-30%; La:20-25%; Pr:0-5%; Nd:5-15%.
Step 3, the auxiliary alloy of melting obtains auxiliary alloy cast ingot, utilizes melt spinning method technique to be prepared into the rapid hardening thin slice, then carries out crystallization and thermal treatment; The roller speed scope of melt spinning method technique is at 2-40m/s, and auxiliary alloy thin band crystallization temperature is 200-400 ℃, and the time is more than 10 minutes.
Step 4 is carried out respectively the broken and follow-up dehydrogenation of hydrogen explosion to main and auxiliary alloy and is processed; The temperature that dehydrogenation is processed is 500-550 ℃, and the time is 2-4h.
Step 5 is mixed main and auxiliary alloy hydrogen flour material, and adds lubricant, antioxidant, gasoline, utilizes airflow milling to grind; Lubricant, antioxidant, gasoline addition are respectively 0.05-0.1%, 0.5-3% and the 1-5% of powdered alloy gross weight, and the average grain size range is at 2-6 μ m after grinding.Wherein, lubricant, antioxidant are commercial products, please two product that holy novel material institute buys from Tianjin, i.e. neodymium iron boron lubricant agent special and oxidation inhibitor.
Step 6 after the powder mixing treatment after grinding, places magnetic field vertical orientated, through becoming blank behind magnetic field die mould and the cold isostatic compaction; The alignment magnetic field size is 1.5-2T, and die mould pressure size in magnetic field is 5-10MPa, waits static pressure die mould pressure size to be 100-200Mpa.
Step 7 with the vacuum sintering of die mould blank, is carried out double tempering thermal treatment again, and the cooling of afterwards material gas being quenched obtains having the sintered NdFeB of higher HCJ and high-corrosion resistance.Wherein vacuum sintering temperature is 950-1150 ℃, and the time is 2-6h; Double tempering thermal treatment is specially: be cooled to below 90 ℃ behind 850-950 ℃ of insulation 2-4h, be warming up to 450-550 ℃ again, gas is quenched to below 90 ℃ behind the insulation 2-4h.
Below in conjunction with embodiment the present invention is done further detailed description:
Embodiment 1
Step 1, preparation neodymium iron boron master alloying, its composition atomic ratio is Nd
12.6Dy
1.4Al
2.3Cu
0.2Nb
0.4B
6.5Fe
76.6, utilize water cooled copper mould that master alloying is cast as the Nd-Fe-B alloys ingot casting, for alloy cast ingot 1000 ℃ of homogenization of composition vacuum heat treatment of carrying out 8h.
Step 2, prepare auxiliary alloy, the atomic percent of auxiliary alloy is Ce
29La
22Pr
3.5Nd
10.5Co
25Al
10
Step 3, the auxiliary alloy of melting obtain auxiliary alloy cast ingot, utilize the rapid hardening thin sheet preparation technique to prepare the rapid hardening thin slice, and roller speed is 40m/s, and auxiliary alloy thin band after 20 minutes, is cooled to room temperature 400 ℃ of vacuum heat treatment.
Step 4, that main and auxiliary alloy is carried out respectively the hydrogen explosion is broken, processes 550 ℃ of dehydrogenations of carrying out 2h.
Step 5, the hydrogen flour material of main and auxiliary alloy was mixed by weight 97: 3, and add the lubricant of weight ratio 0.1%, 3% antioxidant, 5% gasoline, utilize airflow milling to be ground to average grain granularity 6 μ m.
Step 6, the powder after will grinding become blank with the vertical orientated die mould of the pressure of 8MPa in the magnetic field of 1.7T, and then carry out 150MPa etc. the static pressure secondary press.
Step 7, place vacuum at 1050 ℃ of sintering 4h the blank that suppresses, behind 900 ℃ of insulation 3h, be cooled to below 90 ℃ afterwards, be warming up to again 500 ℃ of insulation 3h after gas quench to below 90 ℃.
As the contrast for preparing sample with above-mentioned technique, with major-minor alloy by weight 97: 3 corresponding compositions, prepare comparative sample with single alloy prior, its atomic percent consists of Nd:12.6%, Dy:1.5%, Al:2.4%, Cu:0.2%, Nb:0.4%, B:6.4%, Fe:75.2%, Co:0.4%, Ce:0.4%, La:0.4%, Pr:0.1%, fragmentation under identical processing condition, batch mixing, orientation die mould, in the high vacuum heat treatment furnace with identical temperature rise rate sintering and tempering; Design the auxiliary alloy formula of rich rare earth, Fu Tie, boracic with conventional pairing gold process, the composition atomic percent of its auxiliary alloy is Nd:30%, Fe:24%, Co:35%, B:6%, Al:1%, Cu:4%, according to main and auxiliary weight alloy than 97: 3 batch mixings, fragmentation under identical processing condition, batch mixing, orientation die mould, in the high vacuum heat treatment furnace with identical temperature rise rate sintering and tempering.Together with the single alloy sample with the preparation of master alloying composition, amount to three contrast samples.Weightless situation after measuring the HCJ of four samples and in the environment of 121 ℃, 2 normal atmosphere and 100% humidity, placing 96h, result such as following table:
Embodiment 2
Step 1, preparation neodymium iron boron master alloying, its composition atomic ratio is Nd
12.6Dy
1.4Al
2.3Cu
0.2Nb
0.4B
6.5Fe
76.6, utilize rapid hardening slab technique that master alloying is cast as the Nd-Fe-B alloys slab.
Step 2, prepare auxiliary alloy, the atomic percent of auxiliary alloy is Ce
25La
20Nd
5Co
30Al
15Ga
5
Step 3, the auxiliary alloy of melting obtain auxiliary alloy cast ingot, utilize the rapid hardening thin sheet preparation technique to prepare the rapid hardening thin slice, and roller speed is 5m/s, and auxiliary alloy sheet behind 200 ℃ of vacuum heat treatment 1h, is cooled to room temperature.
Step 4, that main and auxiliary alloy is carried out respectively the hydrogen explosion is broken, processes 500 ℃ of dehydrogenations of carrying out 4h.
Step 5, the hydrogen flour material of main and auxiliary alloy was mixed by weight 88: 12, and add the lubricant of weight ratio 0.05%, 1% antioxidant, 1% gasoline, utilize airflow milling to be ground to average grain granularity 4 μ m.
Step 6, the powder after will grinding become blank with the vertical orientated die mould of the pressure of 10MPa in the magnetic field of 2T, and then carry out 200MPa etc. the static pressure secondary press.
Step 7, place vacuum at 1150 ℃ of sintering 2h the blank that suppresses, behind 950 ℃ of insulation 2h, be cooled to below 90 ℃ afterwards, be warming up to again 450 ℃ of insulation 2h after, gas is quenched to below 90 ℃.
As the contrast for preparing sample with above-mentioned technique, with major-minor alloy by weight 88: 12 corresponding compositions, prepare comparative sample with single alloy prior, its atomic percent consists of Nd:11.9%, Dy:1.3%, Al:3.4%, Cu:0.2%, Nb:0.4%, B:5.9%, Fe:70.1%, Co:2.6%, Ce:2.1%, La:1.7%, Ga:0.4%, fragmentation under identical processing condition, batch mixing, orientation die mould, with identical temperature rise rate sintering and tempering, gas is quenched to room temperature in the high vacuum heat treatment furnace; Design the auxiliary alloy formula of rich rare earth, Fu Tie, boracic with conventional pairing gold process, the composition atomic percent of its auxiliary alloy is Nd:30%, Fe:24%, Co:35%, B:6%, Al:1%, Cu:4%, according to main and auxiliary weight alloy than 88: 12 batch mixings, fragmentation under identical processing condition, batch mixing, orientation die mould, with identical temperature rise rate sintering and tempering, gas is quenched to room temperature in the high vacuum heat treatment furnace.Together with the single alloy sample with the preparation of master alloying composition, amount to three contrast samples.Weightless situation after measuring the HCJ of four samples and in the environment of 121 ℃, 2 normal atmosphere and 100% humidity, placing 96h, result such as following table:
Embodiment 3
Step 1, preparation neodymium iron boron master alloying, its composition atomic ratio is Nd
11.8Dy
2.0Tb
0.2Al
2.0Cu
0.2Nb
0.2B
6.1Fe
77.5, utilize water cooled copper mould that master alloying is cast as the Nd-Fe-B alloys ingot casting, the alloy ingot casting is 1100 ℃ of homogenization of composition vacuum heat treatment of carrying out 5h.
Step 2, prepare auxiliary alloy, the atomic percent of auxiliary alloy is Ce
27La
25Pr
5Nd
15Co
20Al
5Ga
2Cu
1
Step 3, the auxiliary alloy of melting obtain auxiliary alloy cast ingot, utilize the rapid hardening thin sheet preparation technique to prepare the rapid hardening thin slice, and roller speed is 20m/s, and auxiliary alloy sheet after 40 minutes, is cooled to room temperature 300 ℃ of vacuum heat treatment.
Step 4, that main and auxiliary alloy is carried out respectively the hydrogen explosion is broken, processes 525 ℃ of dehydrogenations of carrying out 3h.
Step 5, the hydrogen flour material of main and auxiliary alloy was mixed by weight 92: 8, and add the lubricant of weight ratio 0.075%, 0.5% antioxidant, 3% gasoline, utilize airflow milling to be ground to average grain granularity 2 μ m.
Step 6, the powder after will grinding become blank with the vertical orientated die mould of the pressure of 5MPa in the magnetic field of 1.5T, and then carry out 100MPa etc. the static pressure secondary press.
Step 7, place vacuum at 950 ℃ of sintering 6h the blank that suppresses, behind 850 ℃ of insulation 4h, be cooled to below 90 ℃ afterwards, be warming up to again 550 ℃ of insulation 4h after gas quench to below 90 ℃.
As the contrast for preparing sample with above-mentioned technique, with major-minor alloy by weight 92: 8 corresponding compositions, prepare comparative sample with single alloy prior, its atomic percent consists of Nd:12.0%, Dy:1.9%, Al:2.1%, Cu:0.2%, Nb:0.2%, B:5.8%, Fe:73.9%, Co:0.9%, Ce:1.3%, La:1.2%, Pr:0.2%, Ga:0.1%, Tb:0.2%, fragmentation under identical processing condition, batch mixing, orientation die mould, with identical temperature rise rate sintering and tempering, gas is quenched to room temperature in the high vacuum heat treatment furnace; Design the auxiliary alloy formula of rich rare earth, Fu Tie, boracic with conventional pairing gold process, the composition atomic percent of its auxiliary alloy is Nd:30%, Fe:24%, Co:35%, B:6%, Al:1%, Cu:4%, according to main and auxiliary weight alloy than 92: 8 batch mixings, fragmentation under identical processing condition, batch mixing, orientation die mould, with identical temperature rise rate sintering and tempering, gas is quenched to room temperature in the high vacuum heat treatment furnace.Together with the single alloy sample with the preparation of master alloying composition, amount to three contrast samples.Weightless situation after measuring the HCJ of four samples and in the environment of 121 ℃, 2 normal atmosphere and 100% humidity, placing 96h, result such as following table:
Sample according to above-described embodiment preparation is compared with comparative sample, and HCJ significantly improves, and corrosion-resistant weightlessness declines to a great extent, and therefore, the inventive method can be used for improving HCJ and the corrosion resistance nature of sintered neodymium iron boron material.
Claims (7)
1. sintered NdFeB preparation method who improves HCJ and corrosion resistance nature is characterized in that may further comprise the steps:
Step 1, preparation neodymium iron boron master alloying is prepared into alloy cast ingot with the neodymium iron boron master alloying or utilizes rapid hardening slab technique to be prepared into slab, carries out homogenizing thermal treatment for alloy cast ingot or slab;
Step 2 is prepared auxiliary alloy, and the atomic percent of auxiliary alloy is (Ce-La-Pr-Nd)
100-x-y-zCo
xAl
yM
z, wherein M is one or both and the above mixing among Ga, Cu, the Nb, 20≤x≤30,5≤y≤15,0≤z≤5, and each rare earth element at the total composition Atom of auxiliary alloy percentage composition is: Ce:25-30%; La:20-25%; Pr:0-5%; Nd:5-15%;
Step 3, the auxiliary alloy of melting obtains auxiliary alloy cast ingot, utilizes melt spinning method technique to be prepared into the rapid hardening thin slice, then carries out crystallization and thermal treatment;
Step 4 is carried out respectively the broken and follow-up dehydrogenation of hydrogen explosion to main and auxiliary alloy and is processed;
Step 5 is mixed main and auxiliary alloy hydrogen flour material, and adds lubricant, antioxidant, gasoline, utilizes airflow milling to grind;
Step 6 after the powder mixing treatment after grinding, places magnetic field vertical orientated, through becoming blank behind magnetic field die mould and the cold isostatic compaction;
Step 7 with the vacuum sintering of die mould blank, is carried out double tempering thermal treatment again, and the cooling of afterwards material gas being quenched obtains having the sintered NdFeB of higher HCJ and high-corrosion resistance.
2. the sintered NdFeB preparation method of raising HCJ according to claim 1 and corrosion resistance nature, it is characterized in that: alloy ingot homogenization thermal treatment temp is 950-1150 ℃ in the step 1, the time is 3-20h.
3. the sintered NdFeB preparation method of raising HCJ according to claim 1 and corrosion resistance nature, it is characterized in that: the roller of melt spinning method technique speed scope is at 2-40m/s in the step 3, auxiliary alloy thin band crystallization temperature is 200-400 ℃, and the time is more than 10 minutes.
4. the sintered NdFeB preparation method of raising HCJ according to claim 1 and corrosion resistance nature is characterized in that: the temperature that dehydrogenation is processed in the step 4 is 500-550 ℃, and the time is 2-4h.
5. the sintered NdFeB preparation method of raising HCJ according to claim 1 and corrosion resistance nature, it is characterized in that: lubricant, antioxidant, gasoline addition are respectively 0.05-0.1%, 0.5-3% and the 1-5% of powdered alloy gross weight in the step 5, and the average grain size range is at 2-6 μ m after grinding.
6. the sintered NdFeB preparation method of raising HCJ according to claim 1 and corrosion resistance nature, it is characterized in that: the alignment magnetic field size is 1.5-2T in the step 6, magnetic field die mould pressure size is 5-10MPa, waits static pressure die mould pressure size to be 100-200MPa.
7. the sintered NdFeB preparation method of raising HCJ according to claim 1 and corrosion resistance nature, it is characterized in that: the vacuum sintering temperature is 950-1150 ℃ in the step 7, the time is 2-6h; Double tempering thermal treatment is specially: be cooled to below 90 ℃ behind 850-950 ℃ of insulation 2-4h, be warming up to 450-550 ℃ again, gas is quenched to below 90 ℃ behind the insulation 2-4h.
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