CN111122344A - Structure for realizing ultrahigh-temperature heating of in-situ stretching CT imaging experiment of synchrotron radiation light source - Google Patents

Structure for realizing ultrahigh-temperature heating of in-situ stretching CT imaging experiment of synchrotron radiation light source Download PDF

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Publication number
CN111122344A
CN111122344A CN202010011434.7A CN202010011434A CN111122344A CN 111122344 A CN111122344 A CN 111122344A CN 202010011434 A CN202010011434 A CN 202010011434A CN 111122344 A CN111122344 A CN 111122344A
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situ stretching
light source
synchrotron radiation
situ
radiation light
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王同敏
范国华
康慧君
郭恩宇
陈宗宁
徐宇杰
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Dalian University of Technology
Nanjing Tech University
Beijing Dongfang Measurement and Test Institute
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Dalian University of Technology
Nanjing Tech University
Beijing Dongfang Measurement and Test Institute
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
    • G01N3/18—Performing tests at high or low temperatures
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
    • G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
    • G01N23/04—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material
    • G01N23/046—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material using tomography, e.g. computed tomography [CT]
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/02—Details
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/02—Details
    • G01N3/06—Special adaptations of indicating or recording means
    • G01N3/068—Special adaptations of indicating or recording means with optical indicating or recording means
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
    • H01J37/02—Details
    • H01J37/24—Circuit arrangements not adapted to a particular application of the tube and not otherwise provided for
    • H01J37/242—Filament heating power supply or regulation circuits
    • 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
    • H05B3/00—Ohmic-resistance heating
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0014—Type of force applied
    • G01N2203/0016—Tensile or compressive
    • G01N2203/0017—Tensile
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/022—Environment of the test
    • G01N2203/0222—Temperature
    • G01N2203/0226—High temperature; Heating means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/06—Indicating or recording means; Sensing means
    • G01N2203/0641—Indicating or recording means; Sensing means using optical, X-ray, ultraviolet, infrared or similar detectors
    • 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
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]

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Abstract

The invention provides a structure for realizing ultrahigh-temperature heating of a synchrotron radiation light source in-situ stretching CT imaging experiment, which comprises an electron gun, a vacuum chamber and a vacuum unit communicated with the vacuum chamber, wherein an in-situ stretching table is arranged in the vacuum chamber, the electron gun is arranged above the side wall of the vacuum chamber and is communicated with the side wall of the vacuum chamber, and electron beams emitted by the electron gun can bombard a sample on the in-situ stretching table; heaters are arranged on two sides of a sample on the in-situ stretching table, and a heat insulation structure is arranged between a rotating shaft of the in-situ stretching table and the clamp; and a cooling device is coated on the rotating shaft of the in-situ stretching table. The structure can heat the sample to the room temperature of 1800 ℃, and meanwhile, the in-situ stretching device and other precise parts are ensured to be in the room temperature state.

Description

Structure for realizing ultrahigh-temperature heating of in-situ stretching CT imaging experiment of synchrotron radiation light source
Technical Field
The invention relates to a heating technology, in particular to a structure for realizing ultrahigh-temperature heating in a synchrotron radiation light source in-situ stretching CT imaging experiment.
Background
The synchrotron radiation light source is one of the most important scientific devices in the world science and technology, has the advantages of high brightness, high coherence, high penetration capacity and the like, and becomes a powerful probe for detecting the microstructure of a substance and the evolution law thereof. CT imaging is an important application of synchronous radiation light, and the technology can perform nondestructive analysis on different microstructures in the material and has important application in the fields of archaeology, geology, materials and the like. When the synchronous radiation CT imaging technology is used for researching the microstructure evolution of a substance under the action of the environment such as electricity, magnetism, heat, force and the like, some additional devices need to be built in a synchronous radiation line station, and a local small environment meeting research requirements is built for the substance to be researched.
The microstructure evolution, failure behavior and mechanism of the structural material under the coupling action of temperature and stress are key problems related to the reliability and durability of equipment. The synchrotron radiation in-situ CT imaging technology is a powerful tool for researching the problems, and the real-time and dynamic observation of the failure process of the material under temperature-stress coupling by utilizing the technology can provide a basis for the optimal design of the material and the member which are in service under the environment of the combined action of temperature and stress. At present, a plurality of patents of temperature-stress coupling in-situ research devices matched with the synchrotron radiation CT imaging technology exist. For example, the patent "high temperature heating chamber for in-situ and optical monitoring and synchrotron radiation" uses an annular envelope confocal halogen tungsten lamp to form a high temperature heating chamber, and realizes a high temperature-stress coupling experiment by matching with a mechanical loading port; the patent 'a synchrotron radiation in-situ fiber thermal stretcher' adopts hot air to heat fibers, and realizes the synchrotron radiation research on the mechanical properties of the fibers at high temperature by loading a motor; the patent 'a synchrotron radiation in-situ test device' adopts a resistance heating wire to heat a sample. However, the above invention is not limited by the principle of heating method, and it is not possible to heat the sample at an ultra high temperature of 1200 ℃.
Disclosure of Invention
The invention aims to provide a structure for realizing ultrahigh-temperature heating in a synchrotron radiation light source in-situ stretching CT imaging experiment, aiming at the problem that the conventional synchrotron radiation in-situ testing device cannot heat an ultrahigh-temperature sample at the temperature of more than 1200 ℃, and the structure can heat the sample to the temperature of 1800 ℃ and simultaneously ensure that the in-situ stretching device and other precise parts are in a room temperature state.
In order to achieve the purpose, the invention adopts the technical scheme that: a structure for realizing ultrahigh-temperature heating of a synchrotron radiation light source in-situ stretching CT imaging experiment comprises an electron gun, a vacuum chamber and a vacuum unit communicated with the vacuum chamber, wherein an in-situ stretching table is arranged in the vacuum chamber, the electron gun is arranged above and communicated with the side wall of the vacuum chamber, and electron beams emitted by the electron gun can bombard a sample on the in-situ stretching table; heaters are arranged on two sides of a sample on the in-situ stretching table, and a heat insulation structure is arranged between a rotating shaft of the in-situ stretching table and the clamp; and a cooling device is coated on the rotating shaft of the in-situ stretching table.
Further, the vacuum unit communicates with the lower side of the vacuum chamber. The vacuum chamber and the vacuum unit are used for providing a protective vacuum environment in the experimental process, and severe oxidation of the sample in the high-temperature experiment is avoided.
Further, the heater is a resistance heater.
Furthermore, the number of the heaters is two, and the heaters are respectively fixed on two sides of the sample on the in-situ stretching table through the frames. In the experiment, the heater does not rotate, and the slit between the two heaters is a synchronous radiation X-ray penetration path for detection.
Further, the heat insulation structure comprises aluminum oxide heat insulation ceramic and high-temperature-resistant metal connection structures embedded at two ends of the aluminum oxide heat insulation ceramic, wherein internal threads are arranged on the high-temperature-resistant metal connection structures and are respectively matched with the rotating shaft and the clamp. Wherein pottery plays thermal-insulated, reduces the heat of sample to the rotation axis transmission, and the metal screw thread effect is through helicitic texture connection rotation axis and anchor clamps. The heat insulation structure can reduce the heat conduction of the high-temperature sample to the stretching table mechanism.
Furthermore, the heat insulation structure firstly adopts integrated sintered alumina ceramics and high-temperature-resistant metals arranged at two ends, and then adopts a precise numerical control machine tool to process an upper internal thread and a lower internal thread at one time, so as to ensure the coaxiality of the upper internal thread and the lower internal thread.
Furthermore, the outer surface of the metal connecting structure is provided with an external thread structure so as to improve the mechanical engaging force of the sintered alumina heat-insulating ceramic and the metal connecting structure and further improve the connecting strength.
Furthermore, the cooling device is coated on the rotating shaft and is positioned below the rotating table. The cooling device is used for cooling the rotating shaft, absorbing heat transmitted to the rotating platform from the high-temperature end of the rotating shaft and ensuring that the rotating platform is in a room temperature state.
Further, the cooling structure comprises a radiating fin, a cooling body and a cooling pipeline, wherein the cooling pipeline is communicated with the cooling body; the radiating fins are directly fixed on the rotating shaft through threads, the radiating fins are used for increasing the surface area of radiation heat exchange, and the radiating fins rotate along with the rotating shaft in an experiment; the cooling body is fixed on the frame body of the in-situ stretching table and is in contact with the bottoms of the radiating fins, and the heat transferred from the rotating shaft is absorbed through heat conduction.
Furthermore, the contact part of the cooling body and the bottom of the radiating fin is lubricated by heat-conducting silicone grease, so that the friction force between the two parts is reduced.
Further, the cooling body adopts liquid nitrogen circulative cooling, and the advantage of adopting liquid nitrogen cooling lies in that liquid nitrogen cooling ability is strong, only needs a small amount of liquid nitrogen just can realize effective cooling, and the liquid nitrogen volatilizees fast for nitrogen gas when taking place coolant leakage simultaneously, can not cause the damage of other precision parts, and liquid nitrogen volatilizees simultaneously and can make the interior atmospheric pressure of vacuum chamber sharply increase, can regard as the warning instruction that liquid nitrogen revealed.
The invention also discloses a synchrotron radiation in-situ stretching experiment table which adopts the heating structure.
The invention discloses a structure for realizing ultrahigh temperature heating of a synchrotron radiation light source in-situ stretching CT imaging experiment, which is a heating accessory for providing a local ultrahigh temperature environment for a synchrotron radiation in-situ stretching experiment table, and compared with the existing heating device for synchrotron radiation CT scanning, the structure has the advantages that:
firstly, by utilizing the design of electron gun and resistance heating composite heating, the wide temperature range heating experiment from room temperature to 1800 ℃ ultrahigh temperature can be realized by independently using the resistance heater and adjusting the heating power of the electron gun.
Secondly, the high-temperature environment is localized in a narrow space near the sample, and does not cause interference to other equipment.
And thirdly, the density of electron beams emitted by the electron gun can be reduced through the auxiliary heating of the resistance heater, and the damage of the high-energy-density beams such as the electron beams to the surface of the material is avoided.
Fourthly, the heat insulation structure is produced in a mode of firstly integrating sintering and then processing, and the upper thread structure and the lower thread structure have extremely high coaxiality.
And fifthly, liquid nitrogen cooling is adopted, damage to other precision devices due to leakage of cooling media is avoided, and liquid nitrogen volatilization is used as a medium leakage alarm indication.
The temperature of the service environment of the structure is over 1200 ℃, the synchrotron radiation CT imaging technology can be used for researching the microstructure and defect evolution process of the material under the action of thermal-force coupling in the ultra-high temperature environment, and the structure has important significance for improving the performance of core equipment which is related to national strategic safety, such as an aircraft engine, a gas turbine, a hypersonic aircraft and the like.
Drawings
FIG. 1 is a schematic structural diagram of realization of ultrahigh temperature heating in a synchrotron radiation light source in-situ stretching CT imaging experiment;
FIG. 2 is a schematic diagram of an in-situ stretching station;
FIG. 3 is an enlarged schematic view of the resistive heater of zone A of FIG. 2;
FIG. 4 is a schematic view of an insulation arrangement;
FIG. 5 is a schematic view of a thermal insulation structure;
FIG. 6 is a schematic view of a cooling device arrangement;
fig. 7 is a schematic structural view of the cooling device.
Detailed Description
The invention is further illustrated by the following examples:
example 1
The embodiment discloses a structure for realizing ultrahigh-temperature heating in a synchrotron radiation light source in-situ stretching CT imaging experiment, which is structurally shown in FIGS. 1-7 and comprises an electron gun 1, a vacuum chamber 2 and a vacuum unit 3 communicated with the vacuum chamber 2, wherein an in-situ stretching table 7 is arranged in the vacuum chamber 2, and the structure of the in-situ stretching table is shown in Chinese patent 201810602634.2.
The electron gun 1 is arranged above and communicated with the side wall of the vacuum chamber 2, and electron beams emitted by the electron gun can bombard a sample 8 on the in-situ stretching table; heaters 4 are arranged on two sides of a sample on the in-situ stretching table 7, and a heat insulation structure is arranged between a rotating shaft of the in-situ stretching table 7 and the clamp; and a rotating shaft of the in-situ stretching table 7 is coated with a cooling device.
The vacuum unit 3 communicates with the lower side of the vacuum chamber 2. The vacuum chamber and the vacuum unit are used for providing a protective vacuum environment in the experimental process, and severe oxidation of the sample in the high-temperature experiment is avoided.
The heater 4 is a resistance heater. The number of the heaters 4 is two, and the heaters are respectively fixed on two sides of the sample on the in-situ stretching table 7 through frames. In the experiment, the heater 4 is not rotated, and the middle slits of the two heaters 4 are the transmission paths of the synchronous radiation X-ray for detection.
The heat insulation structure 5 comprises aluminum oxide heat insulation ceramic 11 and high-temperature-resistant metal connecting structures 12 embedded at two ends of the aluminum oxide heat insulation ceramic, wherein internal threads 13 are arranged on the high-temperature-resistant metal connecting structures and are respectively matched with the rotating shaft and the clamp. Wherein the ceramic plays a role in heat insulation and reduces the heat transferred from the sample to the rotating shaft, and the metal thread is used for connecting the rotating shaft 9 and the clamp 10 through a thread structure. The heat insulation structure can reduce the heat conduction of the high-temperature sample to the stretching table mechanism.
The heat insulation structure is formed by firstly adopting integrated sintered alumina ceramic and high-temperature-resistant metal arranged at two ends, and then adopting a precise numerical control machine tool to process an upper internal thread and a lower internal thread at one time, so that the coaxiality of the upper internal thread and the lower internal thread is ensured.
The outer surface of the metal connecting structure is provided with an external thread structure so as to improve the mechanical engaging force of the sintered alumina heat-insulating ceramic and the metal connecting structure and further improve the connecting strength.
The cooling device 6 is coated on the rotating shaft and is positioned below the rotating table. The cooling device 6 is used for cooling the rotating shaft, absorbing heat transferred from the high-temperature end of the rotating shaft to the rotating table and ensuring that the rotating table is in a room temperature state.
The cooling structure 6 comprises heat radiating fins 14, a cooling body 15 and a cooling pipeline, and the cooling pipeline is communicated with the cooling body; the radiating fins are directly fixed on the rotating shaft through threads, the radiating fins are used for increasing the surface area of radiation heat exchange, and the radiating fins rotate along with the rotating shaft in an experiment; the cooling body is fixed on the frame body of the in-situ stretching table and is in contact with the bottoms of the radiating fins, and the heat transferred from the rotating shaft is absorbed through heat conduction.
The contact part of the cooling body and the bottom of the radiating fin is lubricated by heat-conducting silicone grease, so that the friction force between the two parts is reduced.
The cooling body adopts liquid nitrogen circulative cooling, and the advantage of adopting liquid nitrogen cooling lies in that liquid nitrogen cooling capacity is strong, only needs a small amount of liquid nitrogen just can realize effective cooling, and the liquid nitrogen volatilizees fast for nitrogen gas when taking place coolant leakage simultaneously, can not cause the damage of other accurate parts, and liquid nitrogen volatilizees simultaneously and can make the interior atmospheric pressure of vacuum chamber sharply increase, can regard as the warning instruction that the liquid nitrogen revealed.
Example 2
The embodiment discloses a synchrotron radiation in-situ stretching experiment table, which comprises the ultrahigh-temperature heating structure for realizing the synchrotron radiation light source in-situ stretching CT imaging experiment in the embodiment 1.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. A structure for realizing ultrahigh-temperature heating of a synchrotron radiation light source in-situ stretching CT imaging experiment is characterized by comprising an electron gun, a vacuum chamber and a vacuum unit communicated with the vacuum chamber, wherein an in-situ stretching table is arranged in the vacuum chamber, the electron gun is arranged above and communicated with the side wall of the vacuum chamber, and electron beams emitted by the electron gun can bombard a sample on the in-situ stretching table; heaters are arranged on two sides of a sample on the in-situ stretching table, and a heat insulation structure is arranged between a rotating shaft of the in-situ stretching table and the clamp; and a cooling device is coated on the rotating shaft of the in-situ stretching table.
2. The structure for realizing ultrahigh-temperature heating in an in-situ stretching CT imaging experiment of a synchrotron radiation light source according to claim 1, wherein the heater is a resistance heater.
3. The structure for realizing ultrahigh-temperature heating in an in-situ stretching CT imaging experiment of a synchrotron radiation light source according to claim 2, wherein two heaters are respectively fixed on two sides of the sample on the in-situ stretching table through frames. In the experiment, the heater does not rotate, and the slit between the two heaters is a synchronous radiation X-ray penetration path for detection.
4. The structure for realizing ultrahigh-temperature heating in an in-situ stretching CT imaging experiment of a synchrotron radiation light source according to claim 1, wherein the heat insulation structure comprises an alumina heat insulation ceramic and high-temperature-resistant metal connection structures embedded at two ends of the alumina heat insulation ceramic, and internal threads are arranged on the high-temperature-resistant metal connection structures and are respectively matched with the rotating shaft and the clamp.
5. The structure for realizing ultrahigh-temperature heating in an in-situ stretching CT imaging experiment of a synchrotron radiation light source according to claim 4, wherein the heat insulation structure is formed by firstly integrally sintering alumina ceramic and high-temperature-resistant metal arranged at two ends and then machining an upper internal thread and a lower internal thread at one time by using a precision numerical control machine.
6. The structure for realizing ultrahigh-temperature heating in-situ stretching CT imaging experiments of a synchrotron radiation light source according to claim 4, wherein an external thread structure is arranged on the outer surface of the metal connecting structure.
7. The structure for realizing ultrahigh-temperature heating in an in-situ stretching CT imaging experiment of a synchrotron radiation light source as claimed in claim 1, wherein the cooling device is coated on the rotating shaft and is positioned below the rotating table.
8. The structure for realizing ultrahigh-temperature heating in an in-situ stretching CT imaging experiment of a synchrotron radiation light source according to claim 7, wherein the cooling structure comprises a radiating fin, a cooling body and a cooling pipeline, and the cooling pipeline is communicated with the cooling body; the radiating fins are directly fixed on the rotating shaft through threads; the cooling body is fixed on the frame body of the in-situ stretching table and is in contact with the bottoms of the radiating fins.
9. The structure for realizing ultrahigh-temperature heating in an in-situ stretching CT imaging experiment of the synchrotron radiation light source according to claim 7, wherein the contact part of the cooling body and the bottom of the radiating fin is lubricated by heat-conducting silicone grease.
10. The structure for realizing ultrahigh-temperature heating in an in-situ stretching CT imaging experiment of a synchrotron radiation light source according to claim 1, wherein the cooling body is circularly cooled by liquid nitrogen.
CN202010011434.7A 2020-01-06 2020-01-06 Structure for realizing ultrahigh-temperature heating of in-situ stretching CT imaging experiment of synchrotron radiation light source Pending CN111122344A (en)

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US20220074835A1 (en) * 2020-09-04 2022-03-10 Beijing Institute Of Technology High-temperature in-situ loaded computed tomography testing system based on laboratory x-ray source and method therefor
US11662282B2 (en) * 2020-09-04 2023-05-30 Beijing Institute Of Technology High-temperature in-situ loaded computed tomography testing system based on laboratory X-ray source and method therefor
CN112763531A (en) * 2020-12-28 2021-05-07 中国科学院上海应用物理研究所 Test device for thermal fatigue test of liquid nitrogen cooling multilayer film
CN112763531B (en) * 2020-12-28 2022-09-27 中国科学院上海应用物理研究所 Test device for thermal fatigue test of liquid nitrogen cooling multilayer film
CN112881194A (en) * 2021-01-21 2021-06-01 北京理工大学 Lithium battery in-situ force thermal coupling loading device for X-ray CT system
CN114799455A (en) * 2022-04-06 2022-07-29 中国船舶重工集团公司第七二五研究所 Electron gun protection device for vacuum preheating electron beam welding device

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