CN106802078A - A kind of neodymium iron boron high vacuum pressure sintering furnace - Google Patents
A kind of neodymium iron boron high vacuum pressure sintering furnace Download PDFInfo
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- CN106802078A CN106802078A CN201710001775.4A CN201710001775A CN106802078A CN 106802078 A CN106802078 A CN 106802078A CN 201710001775 A CN201710001775 A CN 201710001775A CN 106802078 A CN106802078 A CN 106802078A
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- neodymium iron
- iron boron
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B5/00—Muffle furnaces; Retort furnaces; Other furnaces in which the charge is held completely isolated
- F27B5/04—Muffle furnaces; Retort furnaces; Other furnaces in which the charge is held completely isolated adapted for treating the charge in vacuum or special atmosphere
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B5/00—Muffle furnaces; Retort furnaces; Other furnaces in which the charge is held completely isolated
- F27B5/06—Details, accessories, or equipment peculiar to furnaces of these types
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B5/00—Muffle furnaces; Retort furnaces; Other furnaces in which the charge is held completely isolated
- F27B5/06—Details, accessories, or equipment peculiar to furnaces of these types
- F27B5/18—Arrangement of controlling, monitoring, alarm or like devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B5/00—Muffle furnaces; Retort furnaces; Other furnaces in which the charge is held completely isolated
- F27B5/06—Details, accessories, or equipment peculiar to furnaces of these types
- F27B2005/062—Cooling elements
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Abstract
The present invention relates to a kind of neodymium iron boron high vacuum pressure sintering furnace, the neodymium iron boron high vacuum pressure sintering furnace includes：Pressure vessel, vacuum system, heating insulation system, compression system, cooling system, fast cooling system, electric-control system；Fast cooling system includes：Cooler, heat-insulated door switch mechanism, forced convertion fan, cooler is connected by pipeline with the heating work area in pressure vessel, and form circulation air passage structure, the hot gas in heating work area is blown to cooler by forced convertion fan, heating work area is passed through again through circulating line after hot gas cooling and be blown to cooler, such circulating cooling realizes rapid cooling, and heat-insulated door switch mechanism is arranged on the position between the heating work area of pressure vessel and cooler, and whether control air-flow circulates；Sealing uses combination sealing coil structures, including two high-pressure seal rings and a vaccum seal ring.Sintering furnace vacuum of the invention is high, slip is low, rapid cooling speed very fast, and the neodymium iron boron magnetic body performance of sintering is higher.
Description
Technical field
The present invention relates to rare-earth permanent-magnet material technical field, more particularly to a kind of neodymium iron boron high vacuum pressure sintering furnace.
Background technology
Sintered NdFeB, with excellent magnetic property, is widely used in the energy, hands over as third generation rare earth permanent-magnetic material
The industries such as logical, machinery, medical treatment, IT, household electrical appliances, it is continuous to rare earth permanent magnet neodymium iron boron industry in particular with the development of information technology
New purposes is brought, is that more wide market prospects are carried out in neodymium iron boron industrial zone.
Coercivity H j is one of most important technical parameter of permanent magnet.Improving coercivity can improve the maximum magnetic energy of magnet
Product (BH) m, can improve permanent magnet anti-demagnetization capability in use, improve its stability.At present, the pure ternary that prepared by laboratory
Sintered Nd-Fe-B magnet, remanent magnetism Br, maximum magnetic energy product have exceeded the 90% of theoretical value, and coercivity is also not up to theoretical
The 20% of value, the potentiality for improving coercivity H j are also very big.
At present, improving the coercitive approach of sintered Nd-Fe-B permanent magnet mainly has two aspects：One is to replace to carry by element
It is high by 2:14:The K1 (magnetocrystalline anisotropy constant) of 1 phase, for example, replace Nd by with part Dy and Tb, can effectively improve magnet
Coercivity.But in rare earth resources, the content of Dy and Tb is relatively low, expensive, micro can only add；Two is to improve knot of tissue
Structure, including border structure regulation and control and crystal grain thinning two ways, wherein in terms of crystal grain refinement, to obtain fine grained texture, leading to
Often need to reduce sintering temperature, reduce sintering time, and such measure can reduce the consistency of magnet, and then remanent magnetism is influenceed,
Therefore how Comprehensive Control consistency and fine grain be solve problem key.
Pressure sintering technology is to improve liquid phase sintered material consistency, the best mode of crystal grain thinning tissue, is closed in hard
Golden Material Field obtains widespread adoption, the performance of General Promotion hard alloy.Sintered neodymium iron boron material is similar with hard alloy,
Belong to liquid sintering technology together, but because the requirement of the difference to pressure sintering equipment of material character has difference again.One side
Face, neodymium iron boron property is active, and the vacuum requirement to equipment is very high, typically requires that end vacuum is less than 2.0 × 10-3Pa, slip
Less than 0.5Pa/h, far above the vacuum technique index of hard alloy pressure sintering furnace, (end vacuum is less than less than 1Pa, slip
5Pa/h)；On the other hand, vacuum-sintering and pressure sintering two step of the normal pressures sintering process including base substrate, and the pressure of neodymium iron boron
Power sintering process includes vacuum-sintering, pressure sintering and the step of fast quenching three, the purpose of fast quenching be in order to retain phase relation during sintering,
Do not produce phase transformation, it is desirable to 200 DEG C of time is cooled to from 1100 DEG C less than 20min (empty stove), and hard alloy pressure sintering furnace
Rapid cooling be mainly improve production efficiency, same temperature conditionss cool time is about 2h.
The content of the invention
In view of above-mentioned analysis, the present invention is intended to provide a kind of neodymium iron boron high vacuum pressure sintering furnace, is used to solve now
Have that hard alloy pressure sintering furnace vacuum is low, slip is high, rapid cooling speed cannot meet the problems such as requiring.
The purpose of the present invention is mainly achieved through the following technical solutions：
A kind of neodymium iron boron high vacuum pressure sintering furnace, the neodymium iron boron high vacuum pressure sintering furnace includes：Pressure vessel,
Vacuum system, heating insulation system, compression system, cooling system, fast cooling system, electric-control system；
Heating insulation system includes heating system and heat insulation structural, is arranged at the inside of pressure vessel；
Cooling system includes water tank, cooling tower, water pump, and water tank, cooling tower, water pump are arranged on beyond pressure vessel, and logical
Piping is connected and is passed through pressure vessel, connects to form circulation with the heat exchange structure inside pressure vessel, and pipeline is provided with valve
And flow switch；
Vacuum system, compression system, electric-control system are respectively connected with pressure vessel；
Fast cooling system includes：Cooler, heat-insulated door switch mechanism, forced convertion fan；
Cooler is connected by pipeline with the heating work area in pressure vessel, and forms circulation air passage structure；
The hot gas in heating work area is blown to cooler by forced convertion fan, is passed through again through circulating line after hot gas cooling
Heating work area is simultaneously blown to cooler, and such circulating cooling realizes rapid cooling；
Heat-insulated door switch mechanism is arranged on the position between the heating work area of pressure vessel and cooler, and control air-flow is
No circulation.
Vacuum system is made up of the form that mechanical pump, lobe pump are combined with diffusion pump, and mechanical pump is connected with lobe pump, Roots
Pump is connected with diffusion pump, and diffusion pump is connected with pressure vessel.
The end vacuum of vacuum system is less than 2.0 × 10-3Pa, slip are less than 0.5Pa/h.
The sealing of all parts of high pressure sealing is needed to use combination sealing in neodymium iron boron high vacuum pressure sintering furnace
Coil structures；
Combination sealing coil structures are arranged in the seal groove for needing the position of sealing to set, and including two high-pressure seal rings
With a vaccum seal ring；
Be clipped in the middle for vaccum seal ring by two high-pressure seal rings, and two component contacts for being sealed with needs respectively, and
Two high-pressure seal rings and a vaccum seal ring are in impaction state under installment state；
High-pressure seal ring, the width of vaccum seal ring are respectively less than the width of seal groove.
The heater for heating insulation system is molybdenum heater, and maximum operating temperature is 1300 DEG C；
Temperature homogeneity is less than or equal to ± 5 DEG C to heating insulation system under vacuum conditions, and temperature is uniform under pressure state
Property be less than or equal to ± 5 DEG C；
The highest heating rate for heating insulation system is 15 DEG C/min.
It is pressure medium, maximum working pressure 10MPa that pressure system uses argon gas.
The temperature in the heating work area of pressure vessel is less than from 1100 DEG C of times for dropping to 200 DEG C using fast cooling system
20min。
Electric-control system realizes that temperature, pressure are automatically controlled using industrial computer.
The heating work area size of neodymium iron boron high vacuum pressure sintering furnace is：200×200×300mm3~800 × 800
×3200mm3。
It is a kind of using the neodymium iron boron NbFeB sintered method of high vacuum pressure sintering furnace, steps of the method are：
Step 1：In the heating work area that neodymium iron boron base substrate is positioned over inside sintering furnace pressure vessel, fire door is closed；
Step 2：Vacuum system is opened to sintering stove evacuation, until vacuum is less than 2.0 × 10 in stove-3Pa；
Step 3：Heating system is opened, the hydrogen of the remnants in additive and powder that heated up by required process conditions, removed,
Then heat to sintering temperature and held for some time carries out vacuum-sintering；
Step 4：Open compression system to furnace pressure and reach required sintering pressure, while insulation, pressurize carry out pressure burning
Knot；
Step 5：Fast cooling system is opened, makes Sintered NdFeB magnet fast cooling to less than 200 DEG C；
Step 6：Temper is carried out, Sintered NdFeB magnet is obtained.
The present invention has the beneficial effect that：
1st, the present invention, can be by the combination sealing coil structures comprising two high-pressure seal rings and a vaccum seal ring simultaneously
Meet vacuum and high pressure sealing requirement, end vacuum is less than 2.0 × 10-3Pa, slip are less than 0.5Pa/h, it is ensured that neodymium iron boron is pre-
The high vacuum seal of sintering process and the high pressure sealing of pressure sintering process, obtain the magnet of low oxygen content；
2nd, the design that the present invention passes through fast cooling system, is capable of achieving cooldown rate small from 1100 DEG C of times for being cooled to 200 DEG C
In 20min (empty stove), retain phase relation during sintering, phase transformation is not produced, to obtain high magnetic characteristics.
Other features and advantages of the present invention will be illustrated in the following description, and be become from specification aobvious and easy
See, or understood by implementing the present invention.The purpose of the present invention and other advantages can be wanted by the specification, right write
Specifically noted structure in book and accompanying drawing is asked to realize and obtain.
Brief description of the drawings
Accompanying drawing is only used for showing the purpose of specific embodiment, and is not considered as limitation of the present invention, in whole accompanying drawing
In, identical reference symbol represents identical part.
Fig. 1 is a kind of structural representation of neodymium iron boron high vacuum pressure sintering furnace；
Fig. 2-1 is a kind of installment state schematic diagram of the combination sealing coil structures of neodymium iron boron high vacuum pressure sintering furnace；
Fig. 2-2 illustrates for a kind of high-pressure work state of combination sealing coil structures of neodymium iron boron high vacuum pressure sintering furnace
Figure；
Fig. 2-3 illustrates for a kind of vacuum work state of combination sealing coil structures of neodymium iron boron high vacuum pressure sintering furnace
Figure
In figure：1- electric-control systems, 2- cooling systems, 3- fast cooling systems, 4- vacuum systems, 5- compression systems, 6- pressure hold
Device, 7- heating insulation system, 8- high-pressure seal rings, 9- vaccum seal rings.
Specific embodiment
The preferred embodiments of the present invention are specifically described below in conjunction with the accompanying drawings, wherein, accompanying drawing constitutes the application part, and
It is used to explain principle of the invention together with embodiments of the present invention.
A kind of neodymium iron boron high vacuum pressure sintering furnace, the neodymium iron boron high vacuum pressure sintering furnace includes：Pressure vessel
6th, vacuum system 4, heating insulation system 7, compression system 5, cooling system 2, fast cooling system 3, electric-control system 1；
Heating insulation system 7 includes heating system and heat insulation structural, is arranged at the inside of pressure vessel 6；Heating system
For being that the heating work area in pressure vessel heats, heat insulation structural is used for the heat completely cut off outside heating work area and pressure vessel
Transmission, reaches heat insulation effect.
Cooling system 2 includes water tank, cooling tower, water pump, and water tank, cooling tower, water pump are arranged on beyond pressure vessel, and logical
Piping is connected and is passed through pressure vessel 6, connects to form circulation with the heat exchange structure inside pressure vessel 6, and pipeline is provided with valve
Door and flow switch, for cooling down the pressure vessel 6 of sintering furnace, drawing electrode, vacuum system 4 etc., for protecting sintering furnace
Safety；
Vacuum system 4, compression system 5, electric-control system 1 are respectively connected with pressure vessel 6；
Fast cooling system 3 includes：Cooler, heat-insulated door switch mechanism, forced convertion fan；
Cooler is connected by pipeline with the heating work area in pressure vessel 6, and forms circulation air passage structure；
The hot gas in heating work area is blown to cooler by forced convertion fan, is passed through again through circulating line after hot gas cooling
Heating work area is simultaneously blown to cooler, and such circulating cooling realizes rapid cooling；
Heat-insulated door switch mechanism is arranged on the position between the heating work area of pressure vessel 6 and cooler, controls air-flow
Whether circulate.
Vacuum system 4 is made up of the form that mechanical pump, lobe pump are combined with diffusion pump, and mechanical pump is connected with lobe pump, sieve
Thatch pump is connected with diffusion pump, and diffusion pump is connected with pressure vessel 6.
The end vacuum of vacuum system 4 is less than 2.0 × 10-3Pa, slip are less than 0.5Pa/h.
Neodymium iron boron uses combination sealing coil structures with the sealing of high vacuum pressure sintering furnace all parts；
Combination sealing coil structures are arranged in the seal groove for needing the position of sealing to set, and including two high-pressure seal rings
8 and a vaccum seal ring 9；
Be clipped in the middle for vaccum seal ring 9 by two high-pressure seal rings 8, and two component contacts for being sealed with needs respectively,
And two high-pressure seal rings 8 and a vaccum seal ring 9 are in impaction state under installment state；
High-pressure seal ring 8, the width of vaccum seal ring 9 are respectively less than the width of seal groove.
Sealing structure as shown in Figure 2, initial contact force is uneven, during work under internal pressure effect, along active force
Direction is moved, and changes its cross sectional shape, the also respective change of the contact on sealing surface, as its maximum PmaxMore than medium
During pressure, do not leak, produce sealing effectiveness.Under high-pressure work state, vacuum and high-pressure seal ring 8 are deformed,
Maximum contact pressure P ＞ PInternal pressure, in the maximum distortion degree of sealing ring, pressure is bigger, and sealing effectiveness is better.Vacuum work shape
During state, without deformation, the contact for only relying on the deformation formation of vaccum seal ring 9 is sealed high-pressure seal ring 8, due to fire door
And the problem of furnace shell machining accuracy, and fire door is difficult to be completely secured with the cooperation of furnace shell during use, causes vacuum sealing
The deformation extent of circle 9 is not enough to maintain contact P ＞ PAirState, leakage phenomenon will be produced, it is impossible to meet neodymium iron boron burning
The high vacuum requirement of knot.In the form of two high-pressure seal rings 8 are combined with a vaccum seal ring 9, mended in fire door inner surface
A high-pressure seal ring 8 is filled, is used to compensate because fire door and furnace shell cannot be closed during fire door and furnace shell machining accuracy or use
Reason coordinates the too low problem of caused contact, improves vacuum-packed effect.
The heater for heating insulation system 7 is molybdenum heater, and maximum operating temperature is 1300 DEG C；
Temperature homogeneity is less than or equal to ± 5 DEG C to heating insulation system 7 under vacuum conditions, and temperature is uniform under pressure state
Property be less than or equal to ± 5 DEG C；
The highest heating rate for heating insulation system 7 is 15 DEG C/min.
It is pressure medium, maximum working pressure 10MPa that pressure system uses argon gas.
When rapid cooling technique is implemented, insulated door is opened, and start forced convertion fan, hot gas is quickly flowed to cooler
Rapidly cooled down, passage of the gas after cooling through having installed enters hot-zone.So move in circles, realize pressure vessel 6
The time that the temperature in heating work area drops to 200 DEG C from 1100 DEG C is less than 20min.
Electric-control system 1 realizes that temperature, pressure are automatically controlled using industrial computer.
The heating work area size of neodymium iron boron high vacuum pressure sintering furnace is：200×200×300mm3~800 × 800
×3200mm3。
It is a kind of using the neodymium iron boron NbFeB sintered method of high vacuum pressure sintering furnace, steps of the method are：
Step 1：In the heating work area that neodymium iron boron base substrate is positioned over inside sintering furnace pressure vessel 6, fire door is closed；
Step 2：4 pairs of sintering stove evacuations of vacuum system are opened, until vacuum is less than 2.0 × 10 in stove-3Pa；
Step 3：Heating system is opened, the hydrogen of the remnants in additive and powder that heated up by required process conditions, removed,
Then heat to sintering temperature and held for some time carries out vacuum-sintering；
Step 4：Open compression system 5 to furnace pressure and reach required sintering pressure, while insulation, pressurize carry out pressure burning
Knot；
Step 5：Fast cooling system 3 is opened, makes Sintered NdFeB magnet fast cooling to less than 200 DEG C；
Step 6：Temper is carried out, Sintered NdFeB magnet is obtained.
It is (Nd using sintered magnet composition of the present invention0.955Dy0.045)15.56(Fe0.9905Al0.0095)78.15B6.29Neodymium iron
Boron, through vacuum metling, rapid hardening slab, the powder that hydrogen is broken, airflow milling obtains about 4 μm of particle mean size.Through orientation moulding, isostatic cool pressing
Obtain base substrate.
It is sintered by two kinds of techniques：One sinters for traditional vacuum, 1080 DEG C of vacuum-sintering temperature, soaking time 2h,
Then it is quickly cooled to room temperature and takes out sintering feed；Another technique carries out vacuum-sintering+pressure sintering using the present invention, and vacuum is burnt
1040 DEG C of junction temperature, soaking time 60min, and lead to argon pressurization to 9.5MPa in backward stove sinters 60min, after the completion of it is quick
It is cooled to room temperature and takes out sintering feed.
Two kinds of sintering feeds are processed via identical tempering process and obtains final product sintered NdFeB magnet.After tested, traditional vacuum
The relative density of sintered magnet is 96.8%, about 10.3 μm of average grain size；Through the relative density of vacuum+pressure sintering magnet
It is 99.5%, about 5.7 μm of average grain size.As can be seen here, through vacuum+pressure sintering, the relative density of magnet is significantly lifted,
Crystallite dimension is significantly refined, it will help obtain excellent magnetic property.
In sum, a kind of neodymium iron boron high vacuum pressure sintering furnace is the embodiment of the invention provides, the present invention is by bag
Combination sealing coil structures containing two high-pressure seal rings and a vaccum seal ring, can simultaneously meet vacuum and high pressure sealing will
Ask, end vacuum is less than 2.0 × 10-3Pa, slip are less than 0.5Pa/h, it is ensured that the high vacuum seal of neodymium iron boron pre-sintering process
And the high pressure sealing of pressure sintering process, obtain the magnet of low oxygen content；By the design of fast cooling system, cooling speed is capable of achieving
Rate is cooled to 200 DEG C of time from 1100 DEG C less than 20min (empty stove), retains phase relation during sintering, phase transformation is not produced, to obtain
Obtain high magnetic characteristics.Experiments verify that, the relative density of the magnet sintered using sintering furnace of the invention is significantly lifted, crystallite dimension
Significantly refine
The above, the only present invention preferably specific embodiment, but protection scope of the present invention is not limited thereto,
Any one skilled in the art the invention discloses technical scope in, the change or replacement that can be readily occurred in,
Should all be included within the scope of the present invention.
Claims (10)
1. a kind of neodymium iron boron high vacuum pressure sintering furnace, it is characterised in that the neodymium iron boron high vacuum pressure sintering furnace includes：
Pressure vessel, vacuum system, heating insulation system, compression system, cooling system, fast cooling system, electric-control system；
The heating insulation system includes heating system and heat insulation structural, is arranged at the inside of the pressure vessel；
The cooling system includes water tank, cooling tower, water pump, and the water tank, cooling tower, water pump are arranged on beyond pressure vessel,
And connected by pipeline and be passed through the pressure vessel, connect to form circulation with the heat exchange structure inside the pressure vessel, institute
State pipeline and be provided with valve and flow switch；
The vacuum system, compression system, electric-control system are respectively connected with the pressure vessel；
The fast cooling system includes：Cooler, heat-insulated door switch mechanism, forced convertion fan；
The cooler is connected by pipeline with the heating work area in the pressure vessel, and forms circulation air passage structure；
The hot gas in heating work area is blown to cooler by the forced convertion fan, is passed through again through circulating line after hot gas cooling
Heating work area is simultaneously blown to cooler, and such circulating cooling realizes rapid cooling；
The heat-insulated door switch mechanism is arranged on the position between the heating work area of the pressure vessel and cooler, controls gas
Whether stream circulates.
2. neodymium iron boron according to claim 1 high vacuum pressure sintering furnace, it is characterised in that the vacuum system is by machine
Form that tool pump, lobe pump are combined with diffusion pump is constituted, and the mechanical pump is connected with the lobe pump, the lobe pump with it is described
Diffusion pump is connected, and the diffusion pump is connected with the pressure vessel.
3. neodymium iron boron according to claim 2 high vacuum pressure sintering furnace, it is characterised in that the pole of the vacuum system
Limit vacuum is less than 2.0 × 10-3Pa, slip are less than 0.5Pa/h.
4. neodymium iron boron according to claim 1 high vacuum pressure sintering furnace, it is characterised in that the neodymium iron boron Gao Zhen
The sealing of all parts of high pressure sealing is needed to use combination sealing coil structures in empty pressure sintering furnace；
The combination sealing coil structures are arranged in the seal groove for needing the position of sealing to set, and including two high-pressure seal rings
With a vaccum seal ring；
Be clipped in the middle for the vaccum seal ring by two high-pressure seal rings, and two parts with needs sealing connect respectively
Touch, and two high-pressure seal rings and a vaccum seal ring are in impaction state under installment state；
The high-pressure seal ring, the width of vaccum seal ring are respectively less than the width of seal groove.
5. neodymium iron boron according to claim 1 high vacuum pressure sintering furnace, it is characterised in that the heating insulation system
Heater be molybdenum heater, and maximum operating temperature be 1300 DEG C；
Temperature homogeneity is less than or equal to ± 5 DEG C to the heating insulation system under vacuum conditions, and temperature is uniform under pressure state
Property be less than or equal to ± 5 DEG C；
The highest heating rate of the heating insulation system is 15 DEG C/min.
6. neodymium iron boron according to claim 1 high vacuum pressure sintering furnace, it is characterised in that the pressure system is used
Argon gas is pressure medium, maximum working pressure 10MPa.
7. neodymium iron boron according to claim 1 high vacuum pressure sintering furnace, it is characterised in that use the fast cooling system
The time that the temperature in the heating work area of the pressure vessel drops to 200 DEG C from 1100 DEG C is less than 20min.
8. neodymium iron boron according to claim 1 high vacuum pressure sintering furnace, it is characterised in that the electric-control system is used
Industrial computer realizes that temperature, pressure are automatically controlled.
9. according to any described neodymium iron boron high vacuum pressure sintering furnace of claim 1 to 8, it is characterised in that the neodymium iron
The heating work area size of boron high vacuum pressure sintering furnace is：200×200×300mm3~800 × 800 × 3200mm3。
10. a kind of usage right requires the NbFeB sintered side of 1 to 9 any described neodymium iron boron high vacuum pressure sintering furnace
Method, it is characterised in that steps of the method are：
Step 1：In the heating work area that neodymium iron boron base substrate is positioned over inside sintering furnace pressure vessel, fire door is closed；
Step 2：Vacuum system is opened to sintering stove evacuation, until vacuum is less than 2.0 × 10 in stove-3Pa；
Step 3：Heating system is opened, the hydrogen of the remnants in additive and powder that heated up by required process conditions, removed, then
It is warming up to sintering temperature and held for some time carries out vacuum-sintering；
Step 4：Open compression system to furnace pressure and reach required sintering pressure, while insulation, pressurize carry out pressure sintering；
Step 5：Fast cooling system is opened, makes Sintered NdFeB magnet fast cooling to less than 200 DEG C；
Step 6：Temper is carried out, Sintered NdFeB magnet is obtained.
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| CN205066449U (en) * | 2015-10-23 | 2016-03-02 | 赣州嘉通新材料有限公司 | Be used for three multi -functional room fritting furnaces of neodymium iron boron permanent magnet |
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2017
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|---|---|---|---|---|
| CN2168996Y (en) * | 1993-07-03 | 1994-06-15 | 王者凡 | Assembled sealing ring |
| CN2567535Y (en) * | 2002-09-02 | 2003-08-20 | 董中天 | Neodymium-iron-boron permanent-magnet material multifunction vacuum fritting furnace |
| CN101418386A (en) * | 2007-10-26 | 2009-04-29 | 中国科学院金属研究所 | Equipment for preparing multifunctional amorphous composite material |
| CN104616880A (en) * | 2013-11-04 | 2015-05-13 | 三环瓦克华（北京）磁性器件有限公司 | Method for producing sintered NdFeB magnets |
| CN205066449U (en) * | 2015-10-23 | 2016-03-02 | 赣州嘉通新材料有限公司 | Be used for three multi -functional room fritting furnaces of neodymium iron boron permanent magnet |
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