CN110252986B - Ultrahigh vacuum electromagnetic suspension material preparation system and method - Google Patents
Ultrahigh vacuum electromagnetic suspension material preparation system and method Download PDFInfo
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- CN110252986B CN110252986B CN201910566211.4A CN201910566211A CN110252986B CN 110252986 B CN110252986 B CN 110252986B CN 201910566211 A CN201910566211 A CN 201910566211A CN 110252986 B CN110252986 B CN 110252986B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
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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
- F27D11/06—Induction heating, i.e. in which the material being heated, or its container or elements embodied therein, form the secondary of a transformer
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/02—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples
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Abstract
The invention discloses a system and a method for preparing an ultrahigh vacuum electromagnetic suspension material, which comprises the following steps: the vacuum cavity comprises a cavity body, a vacuum acquisition unit and a control system; wherein the device associated with the chamber comprises a sample suspension mechanism, a sample transmission mechanism, an image acquisition unit, a sample temperature monitoring mechanism, a sample position detection mechanism, a pressure casting unit and safety and accessory facilities. The invention prepares large-volume metal and alloy under the high-vacuum container-free condition based on the electromagnetic induction principle, thereby obtaining more extensive and accurate basic thermophysical property data and providing reliable original data for high-precision analog calculation; the control system can flexibly and effectively control the temperature and the suspension state of the liquid metal in the suspension state, and the extensive experimental research on high-temperature liquid metal solidification and deep supercooling can be developed by combining the image acquisition system, the temperature monitoring mechanism and the pressure casting system, so that the liquid metal in the deep supercooling state can be directly molded, and the high-temperature liquid metal suspension system has excellent mechanical properties.
Description
Technical Field
The invention relates to the technical field of material processing, in particular to a system and a method for preparing an ultrahigh vacuum electromagnetic suspension material.
Background
The container-free processing technology utilizes an external physical field to balance the gravity of a sample, so that an object is in a suspension state, and simultaneously researches the liquid property and the solidification principle of the material by means of various non-contact detection means. Pneumatic suspension, ultrasonic suspension, electrostatic suspension and electromagnetic suspension are widely applied container-free treatment means at present. The technology can realize the stable suspension of particle samples (the diameter of the sample is 1-6 mm, the weight is 0.01-2 g, and the materials are from polymers to various metals and alloys), and has remarkable effect on the aspect of basic scientific research. But limited by the limitation of sample size, the novel material prepared by the above technology faces a series of problems of difficult service performance test and difficult realization of industrial application. For example: the prepared material is small, the mechanical property of the material is difficult to obtain, and the material with excellent performance is difficult to prepare into large-size castings. The containerless production of large volumes of metal has become a focus of concern.
The principle of the electromagnetic suspension container-free processing technology is that an alternating electromagnetic field is generated by high-frequency alternating current, and eddy current is generated on a sample due to the action of electromagnetic induction. On the one hand, the thermal effect of the eddy currents can melt the metal; on the other hand, the eddy current and the external electromagnetic field with specific distribution can suspend metal, so that the purpose of melting and solidifying the metal sample in a suspension state is achieved. Compared with the traditional resistance wire heating, the electromagnetic suspension technology has the characteristics of no container, high heating efficiency, avoidance of pollution of the crucible wall and the like, and is widely applied to basic researches such as solidification theory, deep supercooling, phase separation and the like. Compared with other container-free treatment means, the method has the characteristics of strong suspension capacity and good stability. The electromagnetic suspension technology is also used in the purification process of solar grade silicon and the preparation of nano particles. Recently, researchers can drive liquid metal to move contactlessly by electromagnetic force, and the liquid metal has unique application value in bioengineering. But the sample sizes in the above techniques are all in the order of millimeters.
The electromagnetic suspension container-free processing technology of the large-volume metal inherits the technical characteristics of the current electromagnetic suspension technology, has the advantages of large mass and large size of a suspension sample, and greatly expands the research range of materials based on the electromagnetic suspension technology from the expanded mechanical and electrical performance tests to the direct processing of novel large-size materials. Considering that the size of a sample is increased by about 10-600 times, the suspension and heating in electromagnetic suspension have strong coupling characteristics, and the gravity needs to be overcome by means of electromagnetic force in the suspension process, so that new requirements on the protection of exciting current and coils are provided; when the sample is melted into high-temperature liquid, the influence of a large amount of radiation heat dissipation on the cavity needs to be considered; how to effectively suspend, heat and melt, regulate and control temperature and solidify large-volume metal is a series of core problems of large-volume metal electromagnetic suspension experiments. At present, research results aiming at stable suspension, heating, temperature control and solidification of large-size metal are not found, and an electromagnetic suspension comprehensive solution of large-size metal is not found.
Disclosure of Invention
The embodiment of the invention provides a system and a method for preparing an ultrahigh vacuum electromagnetic suspension material, which are used for solving the problems in the background technology.
The embodiment of the invention provides a system for preparing an ultrahigh vacuum electromagnetic suspension material, which comprises: the device comprises a preparation device, a vacuum acquisition unit and a control system;
the preparation device comprises: the device comprises a cavity, a sample suspension mechanism, a sample position detection mechanism and a pressure casting unit; the vacuum acquisition unit is used for vacuumizing the cavity; the control system is electrically connected with the sample position detection mechanism and the pressure casting unit respectively;
the cavity is of a double-cylinder structure with a small upper part and a big lower part; the upper cavity is used for performing electromagnetic suspension and heating melting on the sample, and the lower cavity is used for performing pressure casting on the melted and dripped sample;
the sample suspension mechanism is used for performing electromagnetic suspension and heating melting on the sample in the cavity;
the sample position detection mechanism is used for detecting the position of a sample in the electromagnetic suspension process in real time;
and the pressure casting unit is used for acquiring the falling position and time of the molten dripping sample according to the real-time position of the sample in the electromagnetic suspension process, and performing die-casting molding on the dripping sample by regulating and controlling the advancing speed and direction of the die.
Furthermore, a metal partition plate with a plurality of round holes is arranged at the connecting part of the upper cavity and the lower cavity.
Further, the sample suspension mechanism includes: the electromagnetic suspension coil is arranged in the cavity and the high-frequency induction heating power supply is arranged outside the cavity, and the electromagnetic suspension coil is electrically connected with the high-frequency induction heating power supply.
Further, the preparation device further comprises: a sample transport mechanism; the sample transmission mechanism is used for suspending a plurality of samples in the cavity body in sequence for experiment and taking out the samples from the cavity body for recovery on the premise of primary vacuum pumping; wherein, handle the inside arm of cavity through step motor and carry out the motion of two degrees of freedom: vertical up-and-down motion and horizontal rotation motion.
Further, the preparation device further comprises: an image acquisition unit; the image acquisition unit is used for collecting the contour image, the position image and the motion state image of the sample in the electromagnetic suspension process in real time; and the image acquisition unit is positioned on the same level as the sample in the electromagnetic levitation process.
Further, the preparation device further comprises: a sample temperature monitoring mechanism; the sample temperature monitoring mechanism includes: the infrared thermometer and a set of gas path pipelines connected with a gas source outside the cavity; the sample temperature monitoring mechanism is used for carrying out non-contact temperature measurement on the sample in the electromagnetic suspension process, and carrying out temperature regulation and control on the sample in the electromagnetic suspension process by regulating the air flow speed of the air path pipeline, the air blowing opening direction of the air path pipeline and the caliber of the air path pipeline.
Further, the die casting unit includes: a die powered by pneumatic, hydraulic or electromagnetic means; the mold is provided with a plurality of elongated holes, the elongated holes are provided with thermocouples, and the thermocouples are used for acquiring heat transfer information of a sample solidification environment.
The embodiment of the invention provides a preparation method of an ultrahigh vacuum electromagnetic suspension material, which comprises the following steps:
enabling the cavity to reach a target vacuum degree through the vacuum acquisition unit, closing the vacuum acquisition unit, recharging inert gas, and adjusting the excitation current of the electromagnetic suspension coil through a high-frequency induction heating power supply to enable the sample to be stably suspended in the electromagnetic suspension coil;
continuously suspending and heating, acquiring the real-time temperature of the suspended sample through a sample temperature monitoring mechanism, and maintaining the temperature of the suspended sample at a target temperature through the sample temperature monitoring mechanism after the suspended sample is melted;
and closing the high-frequency induction heating power supply, dripping the liquid sample into the lower part of the cavity, acquiring the falling position and time of the dripped sample in real time through the sample position detection mechanism, and performing die-casting molding on the dripped sample by controlling the thrust and the speed of the die in the pressure casting unit.
Further, the analysis of the thermophysical properties of the liquid sample specifically comprises:
analyzing the outline, deformation and surface vibration of the liquid sample by a control system to obtain the thermophysical property of the liquid sample at a certain temperature, and obtaining the thermophysical property of the liquid sample at different temperatures by adjusting the temperature; wherein the thermophysical properties include: density, surface tension.
Further, analyzing the solidification mechanism of the liquid sample in the deep undercooled state specifically includes:
by adjusting the air flow speed and the air blowing direction of an air path pipeline connected with an air source, when the temperature of the liquid sample is reduced below a liquid phase line in a suspension state, the deep supercooling state of the liquid sample is obtained, and the solidification mechanism in the deep supercooling state is analyzed.
The embodiment of the invention provides a system and a method for preparing an ultrahigh vacuum electromagnetic suspension material, and compared with the prior art, the system and the method have the following beneficial effects:
the invention prepares large-volume metal and alloy under the high-vacuum container-free condition based on the electromagnetic induction principle, and can realize the electromagnetic suspension experiment of the large-volume metal, thereby obtaining more extensive and accurate basic thermophysical property data and providing reliable original data for high-precision analog calculation; the temperature and the suspension state of the liquid metal in the suspension state can be flexibly and effectively controlled by the control system, and the wide high-temperature liquid metal solidification and deep supercooling experimental research can be developed by combining the image acquisition system, the temperature monitoring mechanism and the pressure casting system; through the structural design of an upper cavity and a lower cavity of the cavity, a position detection system, a temperature monitoring mechanism and a pressure casting system are combined, a liquid sample can be directly molded in a deep super-cooling state, and the obtained large-volume metal has excellent mechanical property; the method is very convenient and fast from raw material processing to casting preparation, and has the characteristics of short processing period and less raw material loss.
Drawings
FIG. 1 is a schematic diagram of an electromagnetic levitation bulk metal solidification apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a system for preparing an ultrahigh vacuum electromagnetic suspension material according to an embodiment of the present invention;
fig. 3 is a schematic top view of a system for preparing an ultrahigh vacuum electromagnetic suspension material according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 to 3, an embodiment of the present invention provides an ultrahigh vacuum electromagnetic suspension material preparation system, which specifically includes: the vacuum cavity comprises a cavity body, a vacuum acquisition unit and a control system; the facilities associated with the chamber include: the device comprises a sample suspension mechanism, a sample transmission mechanism, an image acquisition unit, a sample temperature monitoring mechanism, a sample position detection mechanism, a pressure casting unit and safety and accessory facilities.
The cavity is of a double-cylinder structure with a small upper part and a large lower part, the upper cavity is used for an electromagnetic suspension experiment, and the lower cavity is used for a pressure casting experiment. The cavities are communicated up and down, the liquid metal suspended in the upper cavity can freely fall to the lower cavity without obstacles, and a pressure casting system in the cavities can process materials of falling melts.
Preferably, a metal partition plate with a plurality of round holes is arranged at the connecting part of the upper cavity and the lower cavity, the metal partition plate is used for preventing high-temperature melt from accidentally falling to the substrate of the lower cavity, and a plurality of screw holes are distributed on the metal partition plate and used for installing the support.
Furthermore, a plurality of screw holes are reserved at the top and the bottom of the inner wall of the cavity and used for mounting an accessory bracket. The top, the side and the bottom of the main cavity are provided with a plurality of windows with different sizes for observation, operation, temperature measurement, image acquisition, signal transmission, vacuum acquisition, thrust transmission, high-frequency current introduction, air flow transmission, cooling water circulation and other purposes.
In the embodiment of the invention, the diameter of the upper cavity is 200-800 mm, the height of the upper cavity is 200-800 mm, and the diameter of the lower cavity is 300-900 mm, and the height of the lower cavity is 300-900 mm.
The sample suspension mechanism comprises an electromagnetic suspension coil arranged in a cavity and a high-frequency induction heating power supply outside the cavity, and is used for stably suspending, heating and melting metal and alloy for a long time.
The sample transmission mechanism comprises a sample transmission rod and a sample storage unit and is used for sequentially realizing suspension experiments and recovery work of a plurality of samples on the premise of one-time vacuum extraction. The sample transmission mechanism provides power through a stepping motor, and a mechanical arm in the cavity is controlled to move in 2 degrees of freedom. The first is vertical up-and-down movement, and the second is horizontal rotation movement.
The image acquisition unit adopts a camera to realize real-time collection of information such as sample outline, sample position, sample motion state and the like. The image acquisition unit and the suspended sample are positioned at the same horizontal height.
Wherein, the sample temperature monitoring mechanism comprises an infrared thermometer and a set of gas circuit pipeline connected with an external gas source of the cavity. The non-contact temperature measurement of materials in the electromagnetic suspension process is realized through an infrared thermometer, and the temperature of a metal body is controlled by adjusting the air flow speed, the air blowing opening direction and the pipeline caliber.
The sample position detection mechanism detects the position of the sample by using a high-speed camera, laser or a photodiode.
The pressure casting unit comprises a pneumatic, hydraulic or electromagnetic mode for providing power to propel the mould, a photoelectric detection technology is combined to obtain accurate falling position and time, and a computer regulates and controls the propelling speed and direction of the mould according to the information so that falling liquid drops are solidified and formed. The mold is made of metal or alloy, a plurality of slender cavities are distributed on the mold, and thermocouples can be installed to acquire heat transfer information of a metal solidification environment.
Wherein, the safety and accessory facilities comprise an illuminating electrode, a vacuum chamber safety valve, a vacuum gauge and the like.
The image acquisition unit, the sample temperature monitoring mechanism, the sample position detection mechanism and the pressure casting unit are all connected to a control system, the temperature of the sample is adjusted by utilizing the real-time feedback information of the units, and the mold advancing speed of the pressure casting unit is adjusted.
Further explanation is as follows: the cavity is provided with a plurality of windows for detecting the sample by the various mechanisms. The sample suspension mechanism is positioned on the central axis of the upper cavity. The sample transfer mechanism is connected to the vacuum interior through the top window 10B and functions to transfer the sample. The window 11, the image acquisition unit and the horizontal plane of the coil are kept consistent, and the image acquisition unit acquires an image of the sample through the transparent window 11; the infrared thermometer is positioned on the central axis of the top of the cavity, and temperature information of the sample is obtained through the top transparent window 10A. The sample position detection mechanism consists of a first position detector, a second position detector and a control system, wherein the first position detector and the second position detector are distributed at different heights of the upper cavity and are used for detecting the time of the falling of the melt. The sample temperature monitoring mechanism consists of a gas source, gas circuit equipment, an infrared thermometer and the like, and realizes temperature control through a computer or a manual work according to the target temperature and the real-time sample temperature. The pressure casting unit comprises a mold, a connecting part, a driving device and a thermocouple, wherein the mold is positioned in the lower cavity and is connected with the inside and the outside through a corrugated pipe.
Fig. 2 and 3 are explained: in the figure, 1 is a sample, 2 is an electromagnetic coil, 3A is an upper cavity, 3B is a lower cavity, 4 is a sample transmission system, 5 is an infrared thermometer, 6A is a first position detector, 6B is a second position detector, 7A is a right side mold driving unit, 8A is a right side mold, 7B is a left side mold driving unit, 8B is a left side mold, 9 is a slide rail, 10A is a top center window, 10B is a top standby window, 11 is a side window, 12 is a control system, 13A is an upper cavity front observation window, 13B is a lower cavity front observation window, 14 is a vacuum extraction window, 15A, 15B is a connection window for pressure casting, 16 is a water-cooling connection window for a mould, 17 is a gas path interface, 18 is a power and signal transmission interface, 19 is a thermocouple, 20 is a high-frequency induction power supply, 21 is a high-pressure gas cylinder, and 22 is a metal partition plate.
The embodiment of the invention provides a preparation method of an ultrahigh vacuum electromagnetic suspension material, taking preparation of large-volume metal Ni as an example, the method specifically comprises the following steps:
1. electromagnetic suspension deep supercooling of large-volume metal and basic thermophysical property experiments.
Step one, preparing a suspension environment and electromagnetically suspending large-volume metal.
And the cavity reaches the target vacuum degree through the vacuum acquisition system. The vacuum acquisition system is closed and inert gas is filled. The excitation current of the coil is adjusted by a high-frequency induction heating power supply, so that the sample is stably suspended.
And step two, maintaining the target temperature.
And (4) continuously suspending and heating, and mastering the temperature change of the sample in real time through a sample temperature acquisition system. When the temperature of the sample reaches above the liquidus line, the temperature of the sample is maintained near the target temperature through the combined action of continuous heating and a sample temperature monitoring mechanism under the control of a control system.
And step three, collecting basic thermophysical properties.
And analyzing the contour, deformation and surface vibration of the sample by an image acquisition system to obtain the thermophysical properties of the sample such as density, surface tension and the like at a certain temperature. The temperature is regulated by the sample temperature monitoring system, and various thermophysical properties at different temperatures can be obtained.
Step four, performing deep supercooling experiment on the large-volume metal.
The air flow speed and the blowing direction are adjusted through a temperature monitoring system, and the temperature of the liquid sample is reduced to be below a liquid phase line in a suspension state, so that the sample is in a deep supercooled state. And the image acquisition unit and the temperature detection mechanism are combined to observe and acquire the rapid solidification behavior of the sample in real time.
2. Electromagnetic suspension pressure casting experiment of large volume metal.
Step one, preparing a suspension environment and electromagnetically suspending large-volume metal.
And the cavity reaches the target vacuum degree through the vacuum acquisition system. The vacuum acquisition system was turned off and the inert gas was recharged. The excitation current of the coil is adjusted by a high-frequency induction heating power supply, so that the sample is stably suspended.
And step two, maintaining the target temperature.
And (4) continuously suspending and heating, and mastering the temperature change of the sample in real time through a sample temperature monitoring system. When the temperature of the sample reaches above the liquidus line, the temperature of the sample is maintained near the target temperature through the combined action of continuous heating and a sample temperature monitoring mechanism under the control of a control system.
And step three, pressure casting of the liquid metal sample.
The excitation current was turned off and the sample dropped. The sample position detection mechanism works and feeds back the falling position and time of the liquid metal in real time, and the control system controls the thrust and the speed of the die in the pressure casting unit to make the liquid metal die cast into a casting mold. Meanwhile, the thermocouple on the die obtains the temperature change information of the die in real time.
The above disclosure is only a few specific embodiments of the present invention, and those skilled in the art can make various modifications and variations of the present invention without departing from the spirit and scope of the present invention, and it is intended that the present invention encompass these modifications and variations as well as others within the scope of the appended claims and their equivalents.
Claims (6)
1. An ultrahigh vacuum electromagnetic suspension material preparation system is characterized by comprising: the device comprises a preparation device, a vacuum acquisition unit and a control system;
the preparation device comprises: the device comprises a cavity, a sample suspension mechanism, a sample position detection mechanism and a pressure casting unit; the vacuum acquisition unit is used for vacuumizing the cavity; the control system is electrically connected with the sample position detection mechanism and the pressure casting unit respectively;
the cavity is of a double-cylinder structure with a small upper part and a big lower part; the upper cavity is used for performing electromagnetic suspension and heating melting on the sample, and the lower cavity is used for performing pressure casting on the melted and dripped sample; a metal partition plate with a plurality of round holes is arranged at the connecting part of the upper cavity and the lower cavity;
the sample suspension mechanism is used for performing electromagnetic suspension and heating melting on the sample in the cavity;
the sample position detection mechanism is used for detecting the position of a sample in the electromagnetic suspension process in real time; the sample position detection mechanism includes: the first position detector and the second position detector are distributed at different heights of the upper cavity and are used for detecting the time of the falling of the melt;
the manufacturing apparatus further includes: a sample temperature monitoring mechanism; the sample temperature monitoring mechanism includes: the infrared thermometer and a set of gas path pipelines connected with a gas source outside the cavity; the sample temperature monitoring mechanism is used for carrying out non-contact temperature measurement on a sample in the electromagnetic suspension process, and regulating and controlling the temperature of the sample in the electromagnetic suspension process by regulating the air flow speed of the air path pipeline, the air blowing opening direction of the air path pipeline and the caliber of the air path pipeline;
the pressure casting unit is used for acquiring the falling position and time of the melted dripping sample according to the real-time position of the sample in the electromagnetic suspension process, combining the sample temperature monitoring mechanism and carrying out die-casting molding on the dripping sample in a deep supercooling state by regulating and controlling the propelling speed and the propelling direction of the die; the product forming space of the die is of a three-dimensional structure;
the sample suspension mechanism includes: the electromagnetic suspension coil is arranged in the cavity, and the high-frequency induction heating power supply is arranged outside the cavity and is electrically connected with the high-frequency induction heating power supply;
the die casting unit includes: a die powered by pneumatic, hydraulic or electromagnetic means; the mold is provided with a plurality of elongated holes, the elongated holes are provided with thermocouples, and the thermocouples are used for acquiring heat transfer information of a sample solidification environment.
2. The system for preparing an ultra-high vacuum electromagnetic levitation material as recited in claim 1, wherein the preparing apparatus further comprises: a sample transport mechanism; the sample transmission mechanism is used for suspending a plurality of samples in the cavity body in sequence for experiment and taking out the samples from the cavity body for recovery on the premise of primary vacuum pumping; wherein, handle the inside arm of cavity through step motor and carry out the motion of two degrees of freedom: vertical up-and-down motion and horizontal rotation motion.
3. The system for preparing an ultra-high vacuum electromagnetic levitation material as recited in claim 1, wherein the preparing apparatus further comprises: an image acquisition unit; the image acquisition unit is used for collecting the contour image, the position image and the motion state image of the sample in the electromagnetic suspension process in real time; and the image acquisition unit is positioned on the same level as the sample in the electromagnetic levitation process.
4. A method for preparing an ultrahigh vacuum electromagnetic suspension material by using the ultrahigh vacuum electromagnetic suspension material preparation system of any one of claims 1 to 3, comprising:
enabling the cavity to reach a target vacuum degree through the vacuum acquisition unit, closing the vacuum acquisition unit, recharging inert gas, and adjusting the excitation current of the electromagnetic suspension coil through a high-frequency induction heating power supply to enable the sample to be stably suspended in the electromagnetic suspension coil;
continuously suspending and heating, acquiring the real-time temperature of the suspended sample through a sample temperature monitoring mechanism, and maintaining the temperature of the suspended sample at a target temperature through the sample temperature monitoring mechanism after the suspended sample is melted;
and closing the high-frequency induction heating power supply, dripping the liquid sample into the lower part of the cavity, acquiring the falling position and time of the dripped sample in real time through the sample position detection mechanism, and performing die-casting molding on the dripped sample by controlling the thrust and the speed of the die in the pressure casting unit.
5. The method for preparing an ultrahigh vacuum electromagnetic suspension material as claimed in claim 4, further comprising: the method for analyzing the thermophysical properties of the liquid sample specifically comprises the following steps:
analyzing the outline, deformation and surface vibration of the liquid sample by a control system to obtain the thermophysical property of the liquid sample at a certain temperature, and obtaining the thermophysical property of the liquid sample at different temperatures by adjusting the temperature; wherein the thermophysical properties include: density, surface tension.
6. The method for preparing an ultrahigh vacuum electromagnetic suspension material as claimed in claim 4, further comprising: analyzing the solidification mechanism of the liquid sample in a deep undercooling state, which specifically comprises the following steps:
by adjusting the air flow speed and the air blowing direction of an air path pipeline connected with an air source, when the temperature of the liquid sample is reduced below a liquid phase line in a suspension state, the deep supercooling state of the liquid sample is obtained, and the solidification mechanism in the deep supercooling state is analyzed.
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