CN105386074A - Emission needle wetting method and automatic wetting device thereof - Google Patents
Emission needle wetting method and automatic wetting device thereof Download PDFInfo
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- CN105386074A CN105386074A CN201510788866.8A CN201510788866A CN105386074A CN 105386074 A CN105386074 A CN 105386074A CN 201510788866 A CN201510788866 A CN 201510788866A CN 105386074 A CN105386074 A CN 105386074A
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- emission needle
- thermoshield
- heating unit
- propelling agent
- ball
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G5/00—Cleaning or de-greasing metallic material by other methods; Apparatus for cleaning or de-greasing metallic material with organic solvents
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- Electron Sources, Ion Sources (AREA)
Abstract
The invention discloses an emission needle wetting method and an automatic wetting device of the method, and relates to the technical field of electric propulsion. The device comprises a vacuum cabin, a rack, an emission needle heat shield heating unit, a propellant heat shield heating unit, a motion unit and a control unit. The emission needle heat shield heating unit is connected with the motion unit and vertically corresponds to the propellant heat shield heating unit; the propellant heat shield heating unit is fixed to the rack, the motion unit is connected with the rack and is opposite to the emission needle heat shield heating unit, and the rack is arranged in the vacuum cabin; the control unit is connected with the emission needle heat shield heating unit and the propellant heat shield heating unit and transmits emission needle heating control information and propellant heating control information; and the control unit is connected with the motion unit and transmits the motion control information. Automatic wetting of an electric thruster emission needle can be achieved, and the advantages of being efficient, simple, reliable and high in repeating rate are achieved.
Description
Technical field
What the present invention relates to is a kind of technology of electric propulsion field, specifically a kind of emission needle wetting method and automatically infiltration apparatus.
Background technology
Needle-like Flied emission electric thruster is a kind of electric thruster based on liquid metal ion source technology, and liquid metal propelling agent is transported to transmitting needle point along the fine groove on emission needle surface, is ionized and accelerates ejection to produce thrust under highfield effect.In order to improve the mobility of propelling agent on emission needle surface, need the oxide film on removal emission needle surface and emission needle is infiltrated in liquid metal, but the infiltration realizing emission needle in vacuum environment being more difficult.
At present, the infiltration apparatus of emission needle mainly contains following four kinds: one, the Ph D dissertation " field emission electric thruster serviceability and emission mechanism research thereof " of Shanghai Communications University Duan Junyi is mentioned, tungsten tip is directly placed in the liquid metal indium of melting, common heating also continues for some time rear taking-up, this infiltration apparatus is simply direct, but the oxide film on emission needle surface needs to carry out chemical corrosion cleaning in advance, emission needle after cleaning carries out again being oxidized in impregnation process and cannot avoiding in an atmosphere, causes the effect of impregnation of emission needle and liquid metal poor; Two, the Ph D dissertation " development of nano-focusing ion beam system liquid metal ion source " of CAS Electrical Engineering Research Institute Ma Xiangguo is mentioned, tungsten emit needle is put in the liquid gallium deposit groove in vacuum system, give the heating of deposit groove simultaneously, be heated to certain temperature and through completing infiltration after a while, even if the deficiency of this device is the vaporization temperature of Heating temperature higher than oxide film, but because tungsten emit needle directly contacts with liquid gallium, affect the removal effect of oxide film; Three, mention in Wang great Wen " vacuum science and technology " book, tungsten emit needle and another root tungsten filament are overlapped, galvanization wherein, tungsten filament is generated heat reach a high temperature, although the device adding heat abstraction emission needle surface film oxide this is simple, but two tungsten filament overlap joints are not easily firm, easily cause heating circuit to disconnect; Four, " preparation of gallium liquid metal ion source " of Tsing-Hua University Dong Gui virtue mention, in vacuum system, a pair helical tungsten filament electrified regulation is carried out electron emission, tungsten emit needle bombarded and reaches a high temperature, controlling tungsten pin by transmission mechanism and move up and down, making tungsten point immerse in liquid gallium, this infiltration apparatus can remove the oxide film on emission needle surface preferably, and realize automatically infiltrating, but needing helical tungsten filament to be heated to very high-temperature ability electron emission, heating efficiency is low, complex structure.
Summary of the invention
The present invention is directed to prior art above shortcomings, propose a kind of emission needle wetting method and automatic infiltration apparatus thereof, the automatic infiltration of electric thruster emission needle can be realized, and there is efficient, simple and reliable, that repetition rate is high advantage.
The present invention is achieved by the following technical solutions,
The present invention relates to a kind of emission needle wetting method, by carrying out shielding heating to emission needle and propelling agent respectively, demarcating the vaporization temperature of emission needle oxide film and the temperature of fusion of propelling agent; At demarcation temperature, continue shielding be heated to emission needle oxide film and evaporate completely and propelling agent melts completely; Emission needle is infiltrated in the propelling agent of fusing and complete infiltration.
The present invention relates to a kind of device automatically infiltrated based on aforesaid method control emission needle, comprise: frame, emission needle thermoshield heating unit, propelling agent thermoshield heating unit, moving cell, vacuum chamber and control unit, wherein: emission needle thermoshield heating unit is arranged with propelling agent thermoshield heating unit is corresponding up and down, propelling agent thermoshield heating unit is fixed in frame, moving cell is connected with frame and is oppositely arranged with emission needle thermoshield heating unit, and erecting is placed in vacuum chamber;
Described control unit is connected with propelling agent thermoshield heating unit with emission needle thermoshield heating unit and transmitting pin computer heating control information and propelling agent computer heating control information respectively, and control unit is connected with moving cell and transmitting moving control information.
Described propelling agent thermoshield heating unit comprises: heat radiation platform, tripod, tantalum crucible, armouring heater coil and metal screen layer, wherein: heat radiation platform is fixed in frame, tripod is arranged on heat radiation platform, tantalum crucible is wound with armouring heater coil and is arranged on tripod, and armouring heater coil outer layer covers metal screen layer.
Described emission needle thermoshield heating unit comprises: heater coil fixed support, metal screen layer and armouring heater coil, wherein: heater coil fixed support is provided with thermoshield bottoming hole and is connected with heat radiation platform, and armouring heater coil outer layer covers metal screen layer and is fixed in thermoshield bottoming hole.
Technique effect
Compared with prior art, the present invention adopts the technical scheme of thermal radiation and thermoshield can remove the oxide film on emission needle surface simply efficiently, and the separately heating of emission needle and propelling agent, avoid propelling agent and evaporate at relatively high temperatures, improve the reliability of infiltration; And passing through vaporization temperature and the fusing point of demarcating differing materials, the present invention can also be applicable to the infiltration of multiple emission needle.
Accompanying drawing explanation
Fig. 1 is heating system of the present invention and motor system structural representation;
Fig. 2 is overall structure schematic diagram of the present invention;
In figure: frame 1, propelling agent thermoshield heating unit 2, heat radiation platform 3, tripod 4, armouring heater coil 5, metal screen layer 6, tantalum crucible 7, emission needle thermoshield heating unit 8, heater coil fixed support 9, metal screen layer 10, armouring heater coil 11, emission needle 12, connecting rod 13, emission needle clamping bar 14, slide unit 15, ball-screw 16, tail rod 17, ball-screw pedestal 18, stepper-motor 19, ball-screw support 20, moving cell 21, vacuum chamber 22, control unit 23.
Embodiment
Elaborate to embodiments of the invention below, the present embodiment is implemented under premised on technical solution of the present invention, give detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
Embodiment 1
The present embodiment relates to the method that emission needle infiltrates: carry out shielding heating to emission needle 12 and propelling agent respectively, demarcate the vaporization temperature of oxide film and the temperature of fusion of propelling agent; At demarcation temperature, continue shielding be heated to oxide film and evaporate completely and propelling agent melts completely; Emission needle 12 is infiltrated in the propelling agent of fusing and complete infiltration.
As depicted in figs. 1 and 2, the present invention relates to the device using aforesaid method control emission needle automatically to infiltrate, comprise: frame 1, propelling agent thermoshield heating unit 2, emission needle thermoshield heating unit 8, moving cell 21, vacuum chamber 22 and control unit 23, wherein: emission needle thermoshield heating unit 8 is corresponding with propelling agent thermoshield heating unit about 2 to be arranged, propelling agent thermoshield heating unit 2 is fixed in frame 1, moving cell 21 is connected with frame and is oppositely arranged with emission needle thermoshield heating unit, and frame 1 is arranged in vacuum chamber 22;
Described control unit 23 is connected with emission needle thermoshield heating unit 8 with propelling agent thermoshield heating unit 2 respectively and transmits propelling agent computer heating control information and emission needle computer heating control information, and control unit 23 is connected with moving cell 21 and transmitting moving control information.
Described propelling agent thermoshield heating unit 2 comprises: heat radiation platform 3, tripod 4, armouring heater coil 5, metal screen layer 6 and tantalum crucible 7, wherein: heat radiation platform 3 is fixed in frame 1, tripod 4 is arranged on heat radiation platform 3, tantalum crucible 7 is wound with armouring heater coil 5 and is arranged on tripod 4, and armouring heater coil 5 outer layer covers metal screen layer 6.
Described emission needle thermoshield heating unit 8 comprises: heater coil fixed support 9, metal screen layer 10 and armouring heater coil 11, wherein: heater coil fixed support 9 is provided with thermoshield bottoming hole and is connected with heat radiation platform 3, and the outer layer covers of armouring heater coil 11 metal screen layer 10 and is fixed in thermoshield bottoming hole.
Described moving cell 21 comprises: connecting rod 13, emission needle clamping bar 14, slide unit 15, ball-screw 16, tail rod 17, ball-screw pedestal 18, stepper-motor 19 and ball-screw support 20, wherein: ball-screw support 20 is arranged in frame 1, stepper-motor 19 to be arranged on ball-screw support 20 and to be connected with ball-screw pedestal 18, the slide unit 15 that ball-screw pedestal 18 is provided with tail rod 17, ball screw 16 and is slidably connected with tail rod 17, ball screw 16, connecting rod 13 one end fixes with slide block 15 and is connected, and the other end is provided with emission needle clamping bar 14.
Described metal screen layer 6 and 10 is formed by multilayer metal foil coiling.
Described control unit 23 controls the size of armouring heater coil 5 and 11 by electric current; In a vacuum, slowly, moment high-power heating is easy to blow armouring heater coil 5 and 11, therefore control unit 23 controls the size progressively increasing electric current in heat radiation.
Described emission needle 12 clamping, in emission needle clamping bar 14, is fixed by two screws be vertically screwed into, upper and lower translational motion under the drive of slide unit 15.
Described armouring heater coil 5 and 11 and emission needle 12 coaxial line, when ensureing to heat, on emission needle 12, oxide film can evenly evaporate, and propelling agent can homogeneous immersion.
The automatic impregnation process of the present embodiment emission needle 12 is as follows:
The stroke of described ball-screw 16 is preferably 50mm, and emission needle material is preferably tungsten, length is 35mm, and propelling agent is preferably indium;
Demarcate: respectively armouring heater coil 5 and 11 is energized, heating power supply is adjusted to constant current mode, progressively increase size of current, by the top temperature that thermopair detects emission needle, indium reaches, obtain: electric current is progressively increased to 2.2A from 0A, 30 seconds consuming time, now the accessible maximum temperature of emission needle 12 was higher than the vaporization temperature of tungsten oxide, under this size of current continuous heating after 120 seconds tungsten oxide evaporate completely; Electric current is progressively increased to 1.3A from 0A, and 20 seconds consuming time, now the top temperature of indium arrived 180 DEG C, higher than the temperature of fusion of indium, under this size of current continuous heating after 50 seconds indium melt completely, control unit 23 records heating current size and corresponding consuming time;
Infiltrate: according to the heating current size recorded in calibration process and consuming time, the size of current of armouring heater coil 5 and 11 is progressively adjusted to 2.2A and 1.3A, continuous heating is after 120 seconds, the electric current of armouring heater coil 11 is set to zero, within 20 seconds, control ball-screw 16 afterwards and move downward 25mm, make emission needle stop in indium liquid 30 seconds afterwards control ball-screw 16 move upward 25mm reset, repetitive control ball-screw 16 like this is done downwards, stop and reseting movement totally 5 times to promote the even bonding of indium and emission needle, finally the electric current of armouring heater coil 5 is set to zero, complete impregnation process.
Performance: the emission needle adopting the present invention to infiltrate is assemblied in FEEP thruster structure, carry out light-off trial, test obtains FEEP and can reach following performance index: thruster Absorbable organic halogens work under 0-20 μ N thrust, specific impulse reaches 2000-8000s, meets the demand of FEEP actual task.
Embodiment 2
The automatic impregnation process of the present embodiment emission needle 12 is as follows:
The stroke of described ball-screw 16 is preferably 50mm, and emission needle material is preferably rhenium, length is 35mm, and propelling agent is preferably gallium;
Demarcate: respectively armouring heater coil 5 and 11 is energized, heating power supply is adjusted to constant current mode, progressively increase size of current, by the top temperature that thermopair detects emission needle, gallium reaches, obtain: electric current is progressively increased to 1.8A from 0A, 25 seconds consuming time, now the accessible maximum temperature of emission needle 12 was higher than the vaporization temperature of rhenium oxide, under this size of current continuous heating after 100 seconds rhenium oxide evaporate completely; Electric current is progressively increased to 0.3A from 0A, and 5 seconds consuming time, now the top temperature of gallium arrived 50 DEG C, and higher than the temperature of fusion of gallium, under this size of current, after continuous heating 50s, gallium melts completely, and control unit 23 records heating current size and corresponding consuming time;
Infiltrate: according to the heating current size recorded in calibration process and consuming time, the size of current of armouring heater coil 5 and 11 is progressively adjusted to 1.8A and 0.3A, continuous heating is after 120 seconds, the electric current of armouring heater coil 11 is set to zero, control ball-screw 16 after 20s and move downward 25mm, make emission needle stop in gallium liquid 30 seconds afterwards control ball-screw 16 move upward 25mm reset, repetitive control ball-screw 16 like this is done downwards, stop and reseting movement totally 5 times to promote the even bonding of gallium and emission needle, the electric current of armouring heater coil 5 is set to zero, complete impregnation process.
Claims (7)
1. an emission needle wetting method, it is characterized in that, by carrying out shielding heating to emission needle and propelling agent respectively, demarcate the vaporization temperature of emission needle oxide film and the temperature of fusion of propelling agent, and at demarcation temperature, continue shielding be heated to emission needle oxide film and evaporate completely and propelling agent melts completely, finally emission needle is infiltrated in the propelling agent of fusing and complete infiltration.
2. one kind realizes the automatic infiltration apparatus of the emission needle of method described in claim 1, it is characterized in that, comprise: frame, emission needle thermoshield heating unit, propelling agent thermoshield heating unit, moving cell, vacuum chamber and control unit, wherein: emission needle thermoshield heating unit is arranged with propelling agent thermoshield heating unit is corresponding up and down, propelling agent thermoshield heating unit is fixed in frame, moving cell is connected with frame and is oppositely arranged with emission needle thermoshield heating unit, and erecting is placed in vacuum chamber;
Described control unit is connected with propelling agent thermoshield heating unit with emission needle thermoshield heating unit and transmitting pin computer heating control information and propelling agent computer heating control information respectively, and control unit is connected with moving cell and transmitting moving control information.
3. the automatic infiltration apparatus of emission needle according to claim 2, it is characterized in that, described propelling agent thermoshield heating unit comprises: heat radiation platform, tripod, tantalum crucible, armouring heater coil and metal screen layer, wherein: heat radiation platform is fixed in frame, tripod is arranged on heat radiation platform, tantalum crucible is wound with armouring heater coil and is arranged on tripod, and armouring heater coil outer layer covers metal screen layer.
4. the automatic infiltration apparatus of emission needle according to claim 2, it is characterized in that, described emission needle thermoshield heating unit comprises: heater coil fixed support, metal screen layer and armouring heater coil, wherein: heater coil fixed support is provided with thermoshield bottoming hole and is connected with heat radiation platform, and armouring heater coil outer layer covers metal screen layer and is fixed in thermoshield bottoming hole.
5. the automatic infiltration apparatus of the emission needle according to claim 3 or 4, is characterized in that, described metal screen layer is formed by multilayer metal foil coiling.
6. the automatic infiltration apparatus of the emission needle according to claim 3 or 4, is characterized in that, described armouring heater coil and emission needle coaxial line.
7. the automatic infiltration apparatus of emission needle according to claim 2, it is characterized in that, described moving cell comprises: connecting rod, emission needle clamping bar, slide unit, ball-screw, tail rod, ball-screw pedestal, stepper-motor and ball-screw support, wherein: ball-screw Bracket setting is in frame, stepper-motor to be arranged on ball-screw support and to be connected with ball-screw pedestal, ball-screw pedestal is provided with tail rod, ball screw and and tail rod, the slide unit that ball screw is slidably connected, connecting rod one end fixes with slide block and is connected, the other end is provided with emission needle clamping bar.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510788866.8A CN105386074B (en) | 2015-11-17 | 2015-11-17 | Launch pin wetting method and its automatic infiltration apparatus |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510788866.8A CN105386074B (en) | 2015-11-17 | 2015-11-17 | Launch pin wetting method and its automatic infiltration apparatus |
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| Publication Number | Publication Date |
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| CN105386074A true CN105386074A (en) | 2016-03-09 |
| CN105386074B CN105386074B (en) | 2018-01-30 |
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| CN201510788866.8A Active CN105386074B (en) | 2015-11-17 | 2015-11-17 | Launch pin wetting method and its automatic infiltration apparatus |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106567813A (en) * | 2016-10-09 | 2017-04-19 | 上海空间推进研究所 | Integral high-temperature heating device |
| CN108684127A (en) * | 2018-04-11 | 2018-10-19 | 上海空间推进研究所 | Emitter wetting method and its dedicated unit |
| CN111577562A (en) * | 2020-05-22 | 2020-08-25 | 中国科学院微小卫星创新研究院 | Porous emission needle infiltration device and method |
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| JPS63174242A (en) * | 1987-01-12 | 1988-07-18 | Hitachi Ltd | Emitter tip processing device |
| JPH02207438A (en) * | 1989-02-08 | 1990-08-17 | Hitachi Ltd | Ion source |
| JP2008097858A (en) * | 2006-10-06 | 2008-04-24 | Rohm Co Ltd | Field emission element and its manufacturing method |
| CN101655441A (en) * | 2009-09-29 | 2010-02-24 | 南京大学 | Device for heating needle tip of scanning tunnel microscope |
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2015
- 2015-11-17 CN CN201510788866.8A patent/CN105386074B/en active Active
Patent Citations (4)
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| JPS63174242A (en) * | 1987-01-12 | 1988-07-18 | Hitachi Ltd | Emitter tip processing device |
| JPH02207438A (en) * | 1989-02-08 | 1990-08-17 | Hitachi Ltd | Ion source |
| JP2008097858A (en) * | 2006-10-06 | 2008-04-24 | Rohm Co Ltd | Field emission element and its manufacturing method |
| CN101655441A (en) * | 2009-09-29 | 2010-02-24 | 南京大学 | Device for heating needle tip of scanning tunnel microscope |
Non-Patent Citations (1)
| Title |
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| 段君毅等: ""用于场致发射电推力器的微发射针制造技术"", 《上海交通大学学报》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106567813A (en) * | 2016-10-09 | 2017-04-19 | 上海空间推进研究所 | Integral high-temperature heating device |
| CN108684127A (en) * | 2018-04-11 | 2018-10-19 | 上海空间推进研究所 | Emitter wetting method and its dedicated unit |
| CN111577562A (en) * | 2020-05-22 | 2020-08-25 | 中国科学院微小卫星创新研究院 | Porous emission needle infiltration device and method |
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| CN105386074B (en) | 2018-01-30 |
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