CN109654888A - A kind of high-frequency impulse discharge sintering system - Google Patents
A kind of high-frequency impulse discharge sintering system Download PDFInfo
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- CN109654888A CN109654888A CN201811556901.3A CN201811556901A CN109654888A CN 109654888 A CN109654888 A CN 109654888A CN 201811556901 A CN201811556901 A CN 201811556901A CN 109654888 A CN109654888 A CN 109654888A
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- frequency
- discharge sintering
- vacuum
- sintering furnace
- cushion block
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- 238000005245 sintering Methods 0.000 title claims abstract description 65
- 239000000463 material Substances 0.000 claims abstract description 21
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910002804 graphite Inorganic materials 0.000 claims description 27
- 239000010439 graphite Substances 0.000 claims description 27
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 26
- 238000001816 cooling Methods 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- 239000003990 capacitor Substances 0.000 claims description 9
- 238000005259 measurement Methods 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- PTVDYARBVCBHSL-UHFFFAOYSA-N copper;hydrate Chemical compound O.[Cu] PTVDYARBVCBHSL-UHFFFAOYSA-N 0.000 claims description 2
- 239000004575 stone Substances 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 11
- 238000002360 preparation method Methods 0.000 abstract description 7
- 238000010438 heat treatment Methods 0.000 abstract description 6
- 239000013078 crystal Substances 0.000 abstract description 4
- 239000002131 composite material Substances 0.000 abstract description 3
- 239000000470 constituent Substances 0.000 abstract description 3
- 238000001953 recrystallisation Methods 0.000 abstract description 3
- 208000037656 Respiratory Sounds Diseases 0.000 abstract description 2
- 230000007547 defect Effects 0.000 abstract description 2
- 239000002105 nanoparticle Substances 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 12
- 239000000843 powder Substances 0.000 description 6
- 230000005611 electricity Effects 0.000 description 4
- 238000003466 welding Methods 0.000 description 4
- 230000006837 decompression Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
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- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000002500 effect on skin Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000011812 mixed powder Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000000137 annealing Methods 0.000 description 1
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- 230000015572 biosynthetic process Effects 0.000 description 1
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- 230000001276 controlling effect Effects 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
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- 230000008014 freezing Effects 0.000 description 1
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- 230000001105 regulatory effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000001291 vacuum drying Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D11/00—Arrangement of elements for electric heating in or on furnaces
- F27D11/08—Heating by electric discharge, e.g. arc discharge
- F27D11/10—Disposition of electrodes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
- B22F3/105—Sintering only by using electric current other than for infrared radiant energy, laser radiation or plasma ; by ultrasonic bonding
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D19/00—Arrangements of controlling devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D7/00—Forming, maintaining, or circulating atmospheres in heating chambers
- F27D7/06—Forming or maintaining special atmospheres or vacuum within heating chambers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D9/00—Cooling of furnaces or of charges therein
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B7/00—Heating by electric discharge
- H05B7/02—Details
- H05B7/06—Electrodes
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B7/00—Heating by electric discharge
- H05B7/02—Details
- H05B7/144—Power supplies specially adapted for heating by electric discharge; Automatic control of power, e.g. by positioning of electrodes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D7/00—Forming, maintaining, or circulating atmospheres in heating chambers
- F27D7/06—Forming or maintaining special atmospheres or vacuum within heating chambers
- F27D2007/066—Vacuum
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D9/00—Cooling of furnaces or of charges therein
- F27D2009/0002—Cooling of furnaces
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D9/00—Cooling of furnaces or of charges therein
- F27D2009/0002—Cooling of furnaces
- F27D2009/001—Cooling of furnaces the cooling medium being a fluid other than a gas
- F27D2009/0013—Cooling of furnaces the cooling medium being a fluid other than a gas the fluid being water
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D19/00—Arrangements of controlling devices
- F27D2019/0003—Monitoring the temperature or a characteristic of the charge and using it as a controlling value
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D19/00—Arrangements of controlling devices
- F27D2019/0028—Regulation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Abstract
The present invention relates to a kind of high-frequency impulse discharge sintering systems, belong to the technical field of hard material and composite material preparation；Including high-frequency discharge sintering furnace, electric control box and the high frequency pulse power supply to be interconnected by conducting wire；The high-frequency discharge sintering furnace includes footstock, pedestal and the vacuum furnace chamber between footstock and pedestal, high frequency pulse power supply includes AC transformer, AC/DC convertor and DC voltage regulator three parts, and the positive-negative output end of power supply is connected to the electrode both ends of high-frequency impulse discharge sintering furnace；High-frequency electrical pulses, which flow down, can comprehensively utilize the effects such as skin, neighbouring, dielectric and electric discharge, enhance the high quality and high efficiency connection between micro-nano particle constituent element；The periodical power on/off of high-frequency pulse current can effectively reduce joule heating effect, avoid growing up for crystal grain, while electric pulse can generate the effect of power to dislocation, improve dislocation mobility, promote recrystallization；Effectively heal to the defects of crackle of material internal, the material for preparing inner tight, haveing excellent performance.
Description
Technical field
The present invention relates to a kind of high-frequency impulse discharge sintering systems, belong to the technology neck of hard material and composite material preparation
Domain.
Background technique
Pulsed current annealing, can be in a very short period of time electric energy, thermal energy, strain energy as a kind of extreme nonequilibrium process
It is input in material, to influence the behaviors such as the nano-crystallization of material recovery and recrystallization, phase transformation, crystal grain refinement and amorphous, is
Improve the effective ways of material structure and performance.Therefore, pulse current is sent out in material preparation, processing, forming and use process
Wave increasingly important role.
At this stage, discharge plasma sintering method (SPS) be used as advanced PM technique, be widely used in metal,
The preparation of ceramics and composite material, especially in field of nanocomposite materials.Its working principle is exactly to be filled using special power supply
The low-frequency d pulse current for setting generation loads on the powdered block after cold pressing, generates joule in powder particle contact site
Heat generates heat discharge not in contact with position.Compared with traditional powder metallurgic method, SPS sintering technology required temperature is low and heating is fast
Rate is fast, and the material prepared by SPS sintering technology tiny, high densification feature with crystal grain is with a wide range of applications.
But the scantling of SPS sintering preparation is smaller, it is difficult to meet industrial actual demand.
High-frequency current has significant skin effect and kindred effect, and high-frequency welding speed is big, and welding heat affected zone is small
It is widely used in the welding of thin-wall tube, and the raw material that powder metallurgic method prepares material is the DC pulse using powder as unit
It flows through particle and can flow through granule boundary and generate and discharge, and then realize the formation of sintered neck under the effect of the pressure.Therefore, in powder
Passing to high-frequency pulse current when the sintering of end can make full use of the effects such as skin, neighbouring, dielectric and electric discharge, realize that polynary multidimensional is more
High quality and high efficiency connection between scale micro-nano constituent element.
Summary of the invention
The present invention is that the scantling of solution discharge plasma sintering method (SPS) preparation is smaller, it is difficult to meet actual production
The technical issues of demand, provides a kind of high-frequency impulse discharge sintering system, using high-frequency current skin effect and kindred effect
It prepares large-sized, function admirable and meets the functional material of actual demand.
In order to solve the above technical problems, the technical scheme adopted by the invention is as follows: a kind of high-frequency impulse discharge sintering system,
Including high-frequency discharge sintering furnace, electric control box and the high frequency pulse power supply to be interconnected by conducting wire；
The high-frequency discharge sintering furnace includes footstock, pedestal and the vacuum furnace chamber between footstock and pedestal, the footstock
Top is connected with pressure motor, and the intracavitary top and bottom of the vacuum drying oven are opposite respectively to be provided with electric pole plate and lower electrode
The middle upper portion of plate, the electric pole plate middle lower portion and lower electrode plate is vertically connected with top electrode and lower electrode, institute respectively
The upper end of the lower end and lower electrode of stating top electrode is connected separately with cushion block and lower cushion block, sets between the upper cushion block and lower cushion block
It is equipped with graphite jig, upper cushion block and lower cushion block partly extend in graphite jig, the bottom of the upper cushion block in graphite jig
Portion and the top of lower cushion block are equipped with graphite paper and lower graphite paper respectively；Upper graphite paper and lower graphite paper in graphite jig it
Between place sintering block materials；The lateral wall of the high-frequency discharge sintering furnace is provided with equipped with outer water circulating cooling pipe, and electric discharge is burnt
Side is equipped with vacuum pump outside freezing of a furnace, and vacuum pump is connected by vacuum valve, vacuum tube and vacuum furnace chamber；The discharge sintering furnace
Side is additionally provided with vacuum and takes out interface, K type survey hole of thermocouple, aspirating hole, baffled observation window.
The electric control box is equipped with power switch, pressure electric machine controller, controller for vacuum pump, sintering temperature control
Device, display and indicator light；
The high frequency pulse power supply includes AC transformer, AC/DC convertor and DC voltage regulator three parts, power supply it is positive and negative
Output end is connected to the electrode both ends of high-frequency impulse discharge sintering furnace.
High-frequency impulse discharge sintering system work process of the present invention are as follows: the mixed-powder of material to be sintered is mounted in graphite mo(u)ld
In tool, and place it in sintering furnace；Open vacuum pump switch button, regulating stove chamber internal vacuum；It is cold to open outer water circulation
But it switchs, carries out circulating cooling；High frequency pulse power supply is opened, high-frequency pulse current is passed to mixed-powder, while controlling sintering
Temperature and on-load pressure；The high-frequency pulse current of output by heat electrode be input to the conductive powder in graphite jig,
The effects such as skin, neighbouring, dielectric and electric discharge that significantly become occur for grain Contact Boundary, to prepare large-sized, function admirable and expire
The functional material of sufficient actual demand.
Further, the high frequency pulse power supply output rectangular wave, power magnitude 0-60KW, voltage magnitude 0-20V,
Pulse frequency is 0-5KHz, and pulse width is 20-5000 μ s.
Further, DC voltage regulator includes four bridge arms, and the output end of two of them bridge arm and AC/DC convertor is simultaneously
Connection, and the centre of bridge arm and one end of transformer primary side connect, the centre of another bridge arm and transformer primary side it is another
End connection；Output end in remaining other two bridge arm is parallel with capacitor C and connect with high-frequency discharge sintering furnace, and a bridge
The centre of arm and one end of transformer secondary connect, and the centre of another bridge arm and one end of transformer secondary connect.
Foregoing circuit works first part as AC transformer, and alternating current 10kv is used through AC transformer decompression for exchange 380V
Family power supply, secondary lateral load connect inductance and resistor, provide buffering to quadergy, keep curent change gentle, be conducive to work.
Circuit works second part as AC/DC convertor, is illustrated as Three-phase full-bridge rectification circuit, capacitor C1 can be realized
Filtering, reducing harmonic wave influences.Three-phase bridge rectifier circuit is the IGBT property controlled device and anti-paralleled diode entirely, by by left-to-right and
It sequentially sequentially turns on from top to bottom, anti-paralleled diode afterflow simultaneously gives load quadergy feedback.
Circuit works Part III as DC voltage regulator, realizes that circuit is to hand over straight AC converting circuit, rectified electricity indirectly
The direct current that road provides first passes through single-phase bridge inverter circuit and switchs to alternating current, and inverter circuit generates pulse electricity by phased method
Pressure, through being the supply load of effective low pressure with centre tapped transformer pressure-reducing, inversion alternating current is again straight through single-phase bridge rectification
Galvanic electricity makes to generate on capacitor C2 and stablizes high-frequency pulse current, uses for high-frequency impulse discharge sintering furnace.
Compared with prior art the invention has the following advantages:
1, high-frequency impulse discharge sintering system of the present invention overcomes the material ruler of SPS sintering furnace preparation compared with SPS sintering system
It is very little smaller, generally it is only used for laboratory conditions, it is difficult to the technical issues of meeting Practical Project demand.
2, high-frequency electrical pulses, which flow down, can comprehensively utilize the effects such as skin, neighbouring, dielectric and electric discharge, enhance micro-nano particle constituent element
Between high quality and high efficiency connection.
3, the periodical power on/off of high-frequency pulse current can effectively reduce joule heating effect, avoid growing up for crystal grain, simultaneously
Electric pulse can generate the effect of power to dislocation, improve dislocation mobility, promote recrystallization.
4, high energy pulse electric current can heal the defects of crackle effectively to material internal, prepare inner tight, performance
Excellent material.
Detailed description of the invention
Fig. 1 is high-frequency impulse discharge sintering system structure diagram；
Fig. 2 is high-frequency impulse discharge sintering furnace structure and electric control box schematic diagram；
Fig. 3 is the circuit diagram of high frequency pulse power supply.
It is marked in figure as follows:
1- pedestal, electrode plate under 2-, electrode under 3-, 4- lower cushion block, 5- graphite jig, 6- are sintered block materials, the upper cushion block of 7-, 8-
Top electrode, 9- electric pole plate, 10- footstock, 11- pressure motor, 12- vacuum tube, 13- vacuum valve, 14- vacuum pump, 15- water inlet
Valve, 16- outlet valve, the outer water circulating cooling pipe of 17-, the upper graphite paper of 18-, graphite paper under 19-, 20- vacuum furnace chamber, 21- conducting wire,
22- power switch, 23- pressure electric machine controller, 24- controller for vacuum pump, 25- sintering temperature controller, 26- display, 27-
Electric control box, 28- indicator light, 29- high-frequency impulse discharge sintering furnace, 30- AC transformer, 31- AC/DC convertor, 32- are straight
Flow pressure regulator, 33- inductance, 34- resistor, the 35-IGBT property controlled device entirely, 36- anti-paralleled diode, 37- capacitor C1, 38- change
Depressor, 39- capacitor C2, 40- high frequency pulse power supply.
Specific embodiment
Below in conjunction with specific embodiment, the invention will be further described.
A kind of high-frequency impulse discharge sintering system, including the high-frequency discharge sintering furnace to be interconnected by conducting wire
29, electric control box 27 and high frequency pulse power supply 40；
The high-frequency discharge sintering furnace 29 includes footstock 10, pedestal 1 and the vacuum furnace chamber 20 between footstock 10 and pedestal 1,
The top of the footstock 10 is connected with pressure motor 11, and the top and bottom in the vacuum furnace chamber 20 are opposite respectively to be provided with
The middle upper portion of electric pole plate 9 and lower electrode plate 2,9 middle lower portion of electric pole plate and lower electrode plate 2 vertically connects respectively
There are a top electrode 8 and lower electrode 3, the upper end of the lower end of the top electrode 8 and lower electrode 3 is connected separately with cushion block 7 and lower cushion block
4, graphite jig 5 is provided between the upper cushion block 7 and lower cushion block 4, upper cushion block 7 and lower cushion block 4 partly extend to graphite mo(u)ld
In tool 5, the bottom of the upper cushion block 7 in graphite jig 5 and the top of lower cushion block 4 are equipped with upper graphite paper 18 and lower stone respectively
Black paper 19；Sintering block materials 6 are placed between upper graphite paper 18 and lower graphite paper 19 in graphite jig 5；The high-frequency discharge
The lateral wall of sintering furnace 29 is provided with equipped with outer water circulating cooling pipe 17, and 29 outside side of discharge sintering furnace is equipped with vacuum pump 14,
Vacuum pump 14 is connect by vacuum valve 13, vacuum tube 12 with vacuum furnace chamber 20；The side of the discharge sintering furnace 29 is additionally provided with very
Empty pump interface, K type survey hole of thermocouple, aspirating hole, baffled observation window.
The electric control box 27 is equipped with power switch 22, pressure electric machine controller 23, controller for vacuum pump 24, sintering temperature
Spend controller 25, display 26 and indicator light 28；
The high frequency pulse power supply 40 includes 32 three parts of AC transformer 30, AC/DC convertor 31 and DC voltage regulator, electricity
The positive-negative output end in source is connected to the electrode both ends of high-frequency impulse discharge sintering furnace 29.
The side of the furnace body is equipped with vacuum and takes out interface, K type survey hole of thermocouple, aspirating hole, baffled observation
Window.Air charging system is mainly made of charge valve, suspended body flowmeter, gas ducting etc.；The control of temperature is by temperature digital display journey
Sequence control, and A.T.C is carried out according to process curve set by user, it also may be implemented to manually adjust temperature control.
The furnace bottom is integral type welding structure, and inside has water-cooling groove, and furnace bottom is equipped with heating electrode hole, pressure head sealing
Seat etc..
The vacuum-sintering furnace body inside and outside wall is water flowing cooling, upper and lower flange group between 304 stainless steels and inside and outside wall
It is welded into cylindrical structure, Flange Plane opens up seal groove.
Further, the high frequency pulse power supply 40 exports rectangular wave, power magnitude 0-60KW, voltage magnitude 0-
20V, pulse frequency 0-5KHz, pulse width are 20-5000 μ s.
Further, DC voltage regulator 32 includes four bridge arms, the output of two of them bridge arm and AC/DC convertor 31
End is in parallel, and the centre of a bridge arm is connect with one end of 38 primary side of transformer, and the centre of another bridge arm and transformer 38 are former
The other end on side connects；Output end in remaining other two bridge arm is parallel with capacitor C239 and with high-frequency discharge sintering furnace 29
Connection, and the centre of a bridge arm is connect with the one end on the secondary side of transformer 38, the centre of another bridge arm and the secondary side of transformer 38
One end connection.
The AC/DC convertor 31 of the high frequency pulse power supply 40 includes three by the IGBT property controlled device 35 and inverse parallel entirely
The bridge arm that diode 36 is formed by connecting.Four bridge arms of DC voltage regulator 32 are also the IGBT property controlled device 35 and inverse parallel two entirely
The bridge arm that pole pipe 36 is formed by connecting.
Foregoing circuit works first part as AC transformer 30, and alternating current 10kv is exchange through the decompression of AC transformer 30
380V user's power supply, secondary lateral load connect inductance 33 and resistor 34, provide buffering to quadergy, keep curent change gentle,
Be conducive to work.
Circuit works second part as AC/DC convertor 31, is illustrated as Three-phase full-bridge rectification circuit, capacitor C1 37 can
Realize filtering, reducing harmonic wave influences.Three-phase bridge rectifier circuit is the IGBT property controlled device 35 and anti-paralleled diode 36 entirely, by by
Left-to-right and sequentially sequentially turn on from top to bottom, load quadergy feedback is simultaneously given in 36 afterflow of anti-paralleled diode.
Circuit works Part III as DC voltage regulator 32, realizes that circuit is to hand over straight AC converting circuit indirectly, rectified
The direct current that circuit provides first passes through single-phase bridge inverter circuit and switchs to alternating current, and inverter circuit generates pulse by phased method
Voltage, through being the supply load of effective low pressure with the decompression of centre tapped transformer 38, inversion alternating current is again through single-phase bridge rectification
For direct current, makes to generate on capacitor C239 and stablize high-frequency pulse current, used for high-frequency impulse discharge sintering furnace.
Further, inlet valve 15 and outlet valve 16 are provided on the outer water circulating cooling pipe 17.
It further include mainly by water inlet pipe, return pipe, electric contact pressure by the water-cooling system that outer water circulating cooling pipe 17 forms
Table, valve and pipeline composition pass through pipeline supply vacuum unit, furnace body, heating electrode etc..Water-cooling system and 27 phase of electric control box
Even, when hydraulic pressure is low, sound-light alarm is carried out automatically, and automatically cut off heating power supply function, to ensure equipment safety.
Further, the top electrode 8 and lower electrode 3 are red copper water cooled electrode；Vacuum tube 12 connect with vacuum pump 14 and adopts
With metal bellows, vacuum measurement is measured by resistance vacuum gauge.Vacuum pump 14 is a sliding vane rotary pump, passes through high vacuum valve, vacuum
Regulate, pressure vacuum gauge, vacuum deflation valve, vacuum line etc. are connect with furnace body, and there are inflatable interfaces.
Further, the top of the discharge sintering furnace 29 is additionally provided with bell, and the bell uses Double water-cooled structure；
The water flowing between 304 stainless steels and inside and outside wall of bell inner wall is cooling, and bell is equipped with pressure head seal receptacle.
The pressurization of pressure motor 11 is realized that compression system is by hydraulic station, and pressurize oil cylinder, pressure sensing by compression system
Device, the composition such as pressurization displacement sensor, and controlled by solenoid valve by control system, maximum output pressure 10T can hand
It is dynamic to adjust moulding pressure, moulding pressure can also be automatically adjusted.
Inflation in furnace chamber is realized that air charging system is mainly by charge valve, suspended body flowmeter, gas ducting by air charging system
Deng composition, maximum inflation pressure≤0.02 MPa.
The control of sintering temperature is to carry out to automatically control by temperature digital display programmed controller, and maximum sintering temperature is reachable
1800℃.Electric control box 27 includes: button, indicator light, alarm, air switch, contactor etc..
Whole sintering furnace in the operating condition, there is under-voltage hydraulic pressure, overtemperature, overcurrent automatic interlock and alarm, protection to cut
The function of disconnected main power source.Alarm condition is sound, light indicating mode.
Claims (6)
1. a kind of high-frequency impulse discharge sintering system, which is characterized in that the high frequency including being interconnected by conducting wire is put
Electric sintering furnace (29), electric control box (27) and high frequency pulse power supply (40)；
The high-frequency discharge sintering furnace (29) includes footstock (10), pedestal (1) and true between footstock (10) and pedestal (1)
The top of empty furnace chamber (20), the footstock (10) is connected with pressure motor (11), the top and bottom in the vacuum furnace chamber (20)
Portion is opposite respectively to be provided with electric pole plate (9) and lower electrode plate (2), electric pole plate (9) middle lower portion and lower electrode plate
(2) middle upper portion is vertically connected with top electrode (8) and lower electrode (3), the lower end of the top electrode (8) and lower electrode respectively
(3) upper end is connected separately with cushion block (7) and lower cushion block (4), is provided with stone between the upper cushion block (7) and lower cushion block (4)
Black mold (5), upper cushion block (7) and lower cushion block (4) partly extend in graphite jig (5), are located at upper in graphite jig (5)
The bottom of cushion block (7) and the top of lower cushion block (4) are equipped with graphite paper (18) and lower graphite paper (19) respectively；Graphite jig
(5) sintering block materials (6) is placed between the upper graphite paper (18) and lower graphite paper (19) in；The high-frequency discharge sintering furnace
(29) lateral wall is provided with equipped with outer water circulating cooling pipe (17), and the external side of discharge sintering furnace (29) is equipped with vacuum pump
(14), vacuum pump (14) is connect by vacuum valve (13), vacuum tube (12) with vacuum furnace chamber (20)；The discharge sintering furnace (29)
Side be additionally provided with vacuum take out interface, K type survey hole of thermocouple, aspirating hole, baffled observation window；
The electric control box (27) is equipped with power switch (22), pressure electric machine controller (23), controller for vacuum pump (24), burns
Junction temperature controller (25), display (26) and indicator light (28)；
The high frequency pulse power supply (40) includes AC transformer (30), AC/DC convertor (31) and DC voltage regulator (32) three
Part, the positive-negative output end of power supply are connected to the electrode both ends of high-frequency impulse discharge sintering furnace (29).
2. a kind of high-frequency impulse discharge sintering system according to claim 1, which is characterized in that the high frequency pulse power supply
(40) output rectangular wave, power magnitude 0-60KW, voltage magnitude 0-20V, pulse frequency 0-5KHz, pulse width are
20-5000μs。
3. a kind of high-frequency impulse discharge sintering system according to claim 1 or 2, which is characterized in that DC voltage regulator
It (32) include four bridge arms, two of them bridge arm is in parallel with the output end of AC/DC convertor (31), and the centre of a bridge arm
It is connect with one end of transformer (38) primary side, the centre of another bridge arm is connect with the other end of transformer (38) primary side；Remaining
Other two bridge arm in output end be parallel with capacitor C2(39) and with high-frequency discharge sintering furnace (29) it connect, and a bridge arm
The one end on centre and transformer (38) secondary side connect, the centre of another bridge arm is connect with the one end on transformer (38) pair side.
4. a kind of high-frequency impulse discharge sintering system according to claim 1 or 2, which is characterized in that the outer water circulation
Inlet valve (15) and outlet valve (16) are provided on cooling tube (17).
5. a kind of high-frequency impulse discharge sintering system according to claim 1 or 2, which is characterized in that the top electrode (8)
It is red copper water cooled electrode with lower electrode (3)；Vacuum tube (12) is connect using metal bellows with vacuum pump (14), vacuum measurement by
Resistance vacuum gauge measurement.
6. a kind of high-frequency impulse discharge sintering system according to claim 4, which is characterized in that the discharge sintering furnace
(29) bell is additionally provided at the top of, the bell uses Double water-cooled structure；Bell inner wall be 304 stainless steels and inside and outside wall it
Between water flowing it is cooling, bell is equipped with pressure head seal receptacle.
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| CN110105068A (en) * | 2019-04-30 | 2019-08-09 | 合肥工业大学 | A kind of molding method of thermoelectric material Fast Sintering |
| CN112157265A (en) * | 2020-09-30 | 2021-01-01 | 西部金属材料股份有限公司 | Method and equipment for preparing metal fiber porous material by resistance sintering |
| CN112872360A (en) * | 2021-01-13 | 2021-06-01 | 太原理工大学 | Mixed forming method of iron-based wear-resistant material |
| CN114686718A (en) * | 2022-05-31 | 2022-07-01 | 太原理工大学 | Laser additive manufacturing AlCoCrFeNi2Eutectic high-entropy alloy and strengthening method thereof |
| WO2023121127A1 (en) * | 2021-12-21 | 2023-06-29 | 포스코홀딩스 주식회사 | Heater for vertical sintering furnace |
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| CN114686718A (en) * | 2022-05-31 | 2022-07-01 | 太原理工大学 | Laser additive manufacturing AlCoCrFeNi2Eutectic high-entropy alloy and strengthening method thereof |
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