CN113447518B - Device for simulating fusion of molten droplets and solidified droplets in microgravity environment - Google Patents
Device for simulating fusion of molten droplets and solidified droplets in microgravity environment Download PDFInfo
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Abstract
The invention provides a device for simulating fusion of a molten droplet and a solidified droplet in a microgravity environment, which solves the defect that the existing pipe dropping device cannot complete a uniform droplet fusion test in a ground simulated microgravity environment at present. The device is provided with a solidified micro-droplet release module for containing/releasing solidified metal micro-droplets, and is matched with a uniform metal micro-droplet ejection module, a position adjusting module and a control module, so that the controlled fusion of the metal micro-droplets under the microgravity condition can be realized, a fused micro-droplet sample is obtained, image data is collected (by virtue of an image collecting module), and a foundation is laid for the microgravity fusion behavior research of the metal micro-droplets and even the 3D printing of space metal.
Description
Technical Field
The invention belongs to the technical field of microgravity 3D printing, and particularly relates to a device for simulating fusion of a molten droplet and a solidified droplet in a microgravity environment.
Background
The uniform metal droplet jet printing technology is a rapid printing technology which takes uniform metal droplets as a basic forming unit and realizes a three-dimensional structure according to the point-by-point and layer-by-layer accumulation of part shape characteristics, has the advantages of no need of expensive and high-power energy sources and special equipment, no need of specially-made metal raw materials, controllable size of metal droplets and the like, is applied to a microgravity environment, is expected to provide a new idea for space metal 3D printing, realizes the on-site rapid manufacturing, repairing and material recycling of tools and parts in a space station and a manned space vehicle, gets rid of the dependence of used parts on ground manufacturing, reduces the cost of space exploration, and provides support for the long-term on-orbit operation of the space vehicle.
Whether the molten metal droplet can be effectively fused with the solidified metal droplet or with the material matrix in the microgravity environment is the key for determining whether the uniform metal droplet jet printing technology can be applied in an on-track way.
Chinese patent CN107589145A (name: microgravity solidification device for metal drops) discloses a rapid solidification technology integrating tube dropping and liquid quenching, wherein free falling of metal drops in a tube and subsequent rapid liquid quenching are combined, so that rapid solidification of large-size millimeter-scale drops under the action of microgravity is realized in a shorter tube body; chinese patent CN111230130A (name: fast solidification system and method for suspending large-size metal droplets under microgravity) discloses a fast solidification technology combining electromagnetic suspension smelting with a tube dropping device, coupling two container-free processing technologies of electromagnetic suspension and microgravity, which can eliminate the influence caused by gravity in the falling process of metal droplets and obtain a sample with more uniform solidification structure.
The existing pipe dropping device cannot complete the fusion test of the uniform droplets in the ground simulated microgravity environment at present, and the prior arts including the two patents do not provide valuable references for the fusion of the uniform droplets in the microgravity environment.
Therefore, there is a need to design a testing apparatus capable of simulating the uniform droplet fusion in the microgravity environment on the ground, so as to accumulate the prior experience of the metal droplet fusion in the microgravity environment, verify the feasibility of the in-orbit application of the technology, and provide a ground simulation basis for the theoretical research of the metal droplet fusion in the space environment before carrying out the high-cost in-orbit verification.
Disclosure of Invention
The invention aims to solve the defect that the existing pipe dropping device cannot complete the uniform droplet fusion test in the ground simulated microgravity environment at present, and provides a device for simulating fusion of molten droplets and solidified droplets in the microgravity environment.
In order to achieve the purpose, the technical solution provided by the invention is as follows:
a device for simulating fusion of a molten droplet and a solidified droplet in a microgravity environment is characterized in that: the device comprises a control module, a uniform metal droplet spraying module, a solidified metal droplet releasing module and a position adjusting module, wherein the uniform metal droplet spraying module, the solidified metal droplet releasing module and the position adjusting module are arranged in a low-oxygen environment from top to bottom;
the uniform metal droplet jetting module is used for generating molten metal droplets as raw materials of a fusion test and comprises an excitation component, a crucible, a heating component and a nozzle;
the crucible is used for containing metal raw materials, and the lower end of the crucible is provided with the nozzle which is used for ejecting molten metal droplets; the heating assembly is used for heating the crucible to enable the metal raw material to be in a molten state; the excitation assembly is configured to generate a driving force to provide an initial velocity to the molten metal droplets ejected from the nozzle.
The solidified metal droplet release module is used for accommodating, preheating and releasing the solidified metal droplets, is used as a target material of a fusion test, and comprises an electric component and a heating component;
the heating assembly comprises a heat conduction base block and an electric heating tube, and the electric heating tube is used for heating the heat conduction base block; the heat-conducting base block is composed of a first base block and a second base block which are symmetrically arranged, when the first base block and the second base block are folded, the middle part of the heat-conducting base block penetrates along the vertical direction to form a deep hole, the deep hole comprises a cylindrical section and a conical section which are mutually communicated from top to bottom, the diameters of the bottom surfaces of the cylindrical section and the conical section are equal, the conical section can play a role in centering and guiding solidified microdroplets, and the deep hole can store and heat the solidified microdroplets; releasing the solidified metal droplets located in the deep hole when the first base block and the second base block are separated; the electric component is used for realizing the folding and the separation of the first base block and the second base block;
the position adjusting module is used for adjusting the spatial position (including the position in the horizontal direction and the position in the vertical direction, and also called as a lifting translation module) of the solidified metal droplet releasing module so as to enable the falling tracks of the solidified metal droplet and the molten metal droplet to be superposed and ensure the occurrence of microgravity fusion in space; the position adjusting module can also change the falling distance of the molten metal droplets when fusion occurs, so as to change the collision speed;
the control module is used for controlling the working time points of the uniform metal droplet injection module and the solidified metal droplet release module so as to coordinate the movement of the solidified metal droplet and the molten metal droplet and ensure the occurrence of microgravity fusion in terms of time.
Further, the electric assembly comprises a power element and power arms positioned on two opposite sides of the power element; the two power arms are respectively connected with the first base block and the second base block through the heat insulation plates, and the first base block and the second base block are driven to fold and separate under the action of the power element.
Further, in order to avoid the adhesion of the molten metal to the wall surface of the deep hole, the opposite wall surfaces of the first base block and the second base block are coated with coatings for preventing the adhesion of the molten metal, and the depth of the deep hole formed when the first base block and the second base block are folded is not less than 10mm, so that the droplets are prevented from being separated from the deep hole after bouncing on the wall surface.
Further, the position adjustment module comprises a lifting assembly and a translation assembly; the translation assembly is arranged above the lifting assembly through the adapter plate.
Further, the control module comprises a signal generator, an injection module signal line and a release module signal line; the signal generator sends two paths of signals, the uniform metal droplet injection module and the solidified droplet release module are controlled by the injection module signal line and the release module signal line respectively, and the sequence and the interval time of the two paths of signals sent by the signal generator can be set.
Further, due to heat loss, in order to ensure that the preheating temperature of the heat conduction base block is stabilized within +/-5 ℃ of a set value, the heating assembly further comprises a thermocouple for measuring the temperature of the heat conduction block, and after the thermocouple transmits the temperature of the heat conduction base block back, a temperature controller in the control module can adjust the heating condition of the electric heating tube according to the signal.
Further, the low oxygen environment is provided by a pipe dropping device (mainly a vacuum environment or an inert gas environment), and the height of the pipe dropping device is not lower than 2.5 meters, so as to provide enough dropping time to complete microgravity solidification; the fusing device is arranged at the top end of the pipe falling device.
Furthermore, an image acquisition module can be arranged in the drop tube system to record the pursuit and fusion process of the molten metal droplets and the solidified metal droplets, so that researchers can conveniently know the behavior of the droplets when pursuing fusion and explore the optimal fusion time.
In order to collect the molten sample, a collecting beaker filled with buffer solution can be placed below the fusion device, so that the collision deformation of the sample is reduced, the buffer solution can be silicon oil, the smooth operation of vacuumizing can be ensured, the dropping invariance of the fusion liquid can be ensured, and other solutions which can realize the same function as the silicon oil can be replaced.
The invention also provides a method for performing fusion test by using the device for fusing the molten droplets and the solidified droplets under the simulated microgravity environment, which is characterized by comprising the following steps
1) Assembling and adjusting the fusing device according to test requirements;
1.1) filling metal raw materials in a crucible of a uniform metal droplet jetting module, assembling each module, and placing the modules in a low-oxygen environment;
1.2) horizontally adjusting the spatial position of the solidified metal droplet release module through a position adjusting module to enable the nozzle to be coaxially arranged with the deep hole;
1.3) vertically adjusting the spatial position of the solidified metal droplet release module through a position adjusting module according to the test requirement;
2) manufacture of target material
2.1) starting the heating assembly to melt the metal raw material in the crucible;
2.2) controlling the excitation assembly to provide driving force through the control module, so that molten metal droplets are ejected from the nozzle, enter the deep hole and are solidified to form solidified droplets;
3) fusion test
3.1) preheating the solidified microdroplets through an electric heating pipe;
3.2) controlling the uniform metal droplet injection module to inject the molten metal droplets and the solidified metal droplet release module to release the solidified droplets to simulate fusion by the control module.
Further, the test requirements refer to the location where fusion occurs, the impact speed at which fusion occurs, and the shape and properties of the fused sample, such as: the evolution of the microstructure after fusion;
the distance between the spraying position of the uniform metal droplet spraying module and the releasing position of the solidified metal droplet releasing module and the time interval between the spraying of the uniform metal droplet spraying module and the releasing of the solidified metal droplet releasing module are adjusted to optimize fusion, so that the test requirements are met, and the fusion conditions are determined.
The invention has the advantages that:
1. the invention is provided with a solidification droplet release module for accommodating, preheating and releasing a solidification metal droplet, which is matched with a uniform metal droplet ejection module, a position adjusting module and a control module, can simulate the controlled fusion of the metal droplet under the microgravity condition, obtain fusion droplet samples under different collision speeds and different temperatures, and collect fusion process image data (by means of an image acquisition module arranged in a drop tube), thereby laying a foundation for the microgravity fusion behavior research of the metal droplet and even the 3D printing of space metal. Although it is not difficult in principle to realize microgravity fusion of two droplets, the application aims to solve the problem that two droplets with tiny sizes collide at a preset position, which is not only from inexistence to the greatest problem, but also is a precision problem, so that the observation is convenient and the application is used for basic research.
2. The position adjusting module can adjust the vertical position of the solidified microdroplet releasing module and change the height difference of the initial positions of the two microdroplets, thereby changing the falling distance of the microdroplets before pursuing fusion, further changing the collision speed when the microdroplets meet and being used for exploring the optimal speed condition of fusion. In addition, the position of the solidification droplet release module on the horizontal plane can be adjusted by the position adjusting module to compensate processing errors, so that the motion tracks of the two droplets are accurately superposed, and accurate collision of submillimeter-level droplets is realized with low cost and simple structure.
3. The solidification droplet release module comprises an electric heating tube and a thermocouple, can preheat the solidification metal droplet under the control of a control module temperature controller, realizes fusion under different temperature conditions, and can be used for exploring the optimal temperature condition of fusion.
4. The control module can adjust the time of jetting the molten metal droplets and releasing the solidified metal droplets, and is matched with the position adjusting module to coordinate the movement of the solidified metal droplets and the molten metal droplets, so that microgravity fusion at a preset position is realized, on one hand, the acquisition of image data is facilitated, and decisive evidence can be provided for the fusion under the microgravity condition; on the other hand, the convenient control of the fusion parameters also enables systematic testing in groups to explore the optimal conditions for microgravity fusion.
Drawings
Fig. 1 is a schematic structural diagram of a system according to an embodiment of the present invention.
FIG. 2 is a schematic diagram of a homogeneous metal droplet ejection module according to an embodiment of the invention;
FIG. 3 is a front view of a coagulated droplet release module according to an embodiment of the present invention;
FIG. 4 is a side view of a coagulating droplet release module of an embodiment of the invention;
FIG. 5 is a top view of a coagulated droplet release module according to an embodiment of the present invention;
FIG. 6 is a cross-sectional view of a coagulated droplet release module according to an embodiment of the present invention;
fig. 7 is an isometric view of a coagulated droplet release module of an embodiment of the present invention;
FIG. 8 is a front view of a position adjustment module of an embodiment of the present invention;
FIG. 9 is a top view of a position adjustment module of an embodiment of the present invention;
FIG. 10 is a side view of a position adjustment module of an embodiment of the present invention;
FIG. 11 is a schematic diagram of a control module according to an embodiment of the invention;
FIG. 12 is a schematic view of a fusion test calculation according to an embodiment of the present invention;
the reference numbers are as follows:
1-a homogeneous metal droplet ejection module; 2-a vibration excitation component; 3-injection module signal line; 4-a heating assembly; 5-a crucible; 6-a nozzle; 7-a frozen droplet release module; 8-release module signal line; 9-an electrically powered component; 10-a heat insulation plate; 11-a thermocouple; 12-a bolt; 13-electric heating tubes; 14-deep holes; 15-heat conducting base block; 16-a position adjustment module; 17-a translation assembly; 18-an adapter plate; 19-a lifting assembly; 20-a control module; 21-a signal generator; 22-a first base block; 23-a second base block; 24-a power element; 25-power arm.
Detailed Description
The invention is described in further detail below with reference to the following figures and specific examples:
referring to fig. 1 to 11, the fusing device of the present invention includes a control module, and a uniform metal droplet ejection module, a solidified metal droplet discharge module, and a position adjustment module, which are disposed in a low oxygen environment from top to bottom. The low oxygen environment is provided by a tube dropping device (mainly a vacuum environment or an inert gas environment), the height of the tube dropping device is generally not less than 2.5 meters, and the fusion device is arranged at the top end of the tube dropping device. An image acquisition module can be arranged in the drop tube system to record the process of pursuing and fusing the molten metal droplets and the solidified metal droplets, so that researchers can conveniently explore the optimal fusion opportunity by pursuing the falling track of the pursuing and fusing.
The control module comprises a signal generator, an injection module signal wire and a release module signal wire; the signal generator sends two paths of signals, the uniform metal droplet injection module and the solidified droplet release module are controlled by the injection module signal line and the release module signal line respectively, the sequence and the interval time of the two paths of signals sent by the signal generator can be set, the working time points of the uniform metal droplet injection module and the solidified metal droplet release module are controlled, the movement of the solidified metal droplet and the movement of the molten metal droplet are coordinated, and the microgravity fusion is guaranteed in time.
The uniform metal droplet ejection module is used for generating molten metal droplets as a raw material for a fusion test, and comprises a vibration excitation assembly, a crucible, a heating assembly, and a nozzle. The crucible is used for containing metal raw materials, the lower end of the crucible is provided with the nozzle, and the nozzle is used for ejecting molten metal droplets; the heating assembly is used for heating the crucible to enable the metal raw material to be in a molten state; the control module controls the excitation assembly to generate a driving force to provide an initial velocity for molten metal droplets ejected from the nozzle. The vibration excitation assembly receives a signal sent by the control module, pulse pressure is generated according to needs to extrude molten liquid in the cavity, the molten liquid is forced to flow downwards to form a liquid column, more molten liquid flows out under the action of pressure and surface tension in the cavity, the liquid column is extended to form an approximate sphere gradually, and after the pressure in the cavity is reduced, the speed of fluid at the outlet of the nozzle is smaller than that of the fluid which flows out in advance, so that the liquid column is necked and is broken into single molten drops; the stability of the jet is related to the size of the excitation driving force, the aperture of the nozzle, the oxygen content in the environment and the like. In the embodiment, the parameters of the excitation driving force are determined by the amplitude and the pulse width of the applied pulse signal, the commonly used amplitude is about 1-7V, and the pulse width is about 100-800 mu s; the diameter of the nozzle is generally about 300 to 600 μm; the oxygen content in the environment is generally required to be less than 20 ppm.
The solidified metal droplet release module is used for accommodating, preheating and releasing the solidified metal droplets and used as a target material for a fusion test, and comprises an electric component and a heating component. The heating assembly comprises a heat conduction base block, an electric heating tube and a thermocouple, wherein the electric heating tube is used for heating the heat conduction base block, and the thermocouple is used for measuring the temperature of the heat conduction base block so as to reduce errors of test data of ground research. The heat-conducting base block is composed of a first base block and a second base block which are symmetrically arranged, when the first base block and the second base block are folded, the middle part of the heat-conducting base block penetrates along the vertical direction to form a deep hole, the deep hole comprises a cylindrical section and a conical section which are mutually communicated from top to bottom, the diameters of the bottom surfaces of the cylindrical section and the conical section are equal, and the deep hole can store and heat the solidified metal microdroplets to realize fusion at different temperatures; when the first substrate and the second substrate are separated, the solidified metal droplet in the deep hole is released. The electric assembly comprises a power element and power arms positioned on two opposite sides of the power element; the two power arms are respectively connected with the first base block and the second base block through the heat insulation plates (connected through bolts), and the first base block and the second base block are driven to be folded and separated under the action of the power elements. For the control of the heating assembly, a temperature controller can be introduced into the control module, the electric heating tube and the thermocouple are connected to the temperature controller, the heating temperature is set on the temperature controller for control, the temperature controller is arranged outside the drop tube and is connected with the part in the drop tube through the vacuum electrode on the tube wall, the temperature of the electric heating tube is increased by the feedback signal of the thermocouple in real time, and the fluctuation range of the preheating temperature is ensured to be within +/-5 ℃ of a set value.
The position adjusting module comprises a lifting component and a translation component, and the translation component is arranged above the lifting component through an adapter plate; the translation assembly adjusts the deep hole and the nozzle to be in a coaxial state, so that the falling tracks of the solidified metal droplets and the molten metal droplets are ensured to be superposed, and the microgravity fusion is ensured to occur in space; the lifting assembly varies the distance of fall of the molten metal droplets as fusion occurs, thereby varying the impact velocity. In the embodiment, the test expense and the test space are considered, the adjustment of the position adjusting module is still manually adjusted at present, and the adjusted position adjusting module is sealed in the tube dropping device.
Wherein the preheating temperature range is determined according to the melting point of the raw material used in the fusion test, and the raw material is aluminum alloy, and is generally 200-550 ℃; the distance range between the spraying position and the releasing position is 50 mm-150 mm; the initial velocity of the resulting molten droplets was measured to be about 1 m/s.
The method for performing the fusion test by using the device for simulating the fusion of the molten droplet and the solidified droplet in the microgravity environment comprises the following steps
1) Assembling and adjusting the fusion device according to the test requirement;
1.1) filling metal raw materials in a crucible of a uniform metal droplet jetting module, assembling all modules, and placing the modules in a low-oxygen environment;
1.2) adjusting the horizontal position of the solidified metal droplet release module through a translation assembly of the position adjusting module to enable the nozzle to be coaxially arranged with the deep hole), wherein a vertical detector can be used for measuring whether the nozzle is coaxial or not, namely whether the nozzle is aligned or not, so that the falling tracks are ensured to be coincident;
1.3) adjusting the upper and lower positions of the solidified metal droplet release module through a lifting assembly according to test requirements, namely adjusting the height difference between the spraying position of the uniform metal droplet spraying module and the releasing position of the solidified metal droplet release module;
2) manufacture of target material
2.1) starting the heating assembly to melt the metal raw material in the crucible;
2.2) the signal generator sends a signal to the vibration excitation assembly through the signal line of the injection module, and the vibration excitation assembly works to enable molten metal droplets to be sprayed out from the nozzle, enter the deep hole and solidify to form solidified droplets, namely the target material;
3) fusion test
3.1) preheating the solidified microdroplets through an electric heating pipe to realize fusion under different temperature conditions;
and 3.2) setting the precedence relationship of the two paths of signals sent by the signal generator and the time interval of the two paths of signals according to the test requirement (matching with the adjustment of the lifting assembly in the step 1) so as to enable fusion to occur at the expected position.
The signal generator respectively sends signals to the vibration excitation assembly and the electric assembly through the injection module signal wire and the release module signal wire; the vibration excitation component starts to work after receiving a signal, so that a single molten metal droplet is sprayed out from the nozzle and used as a raw material for a fusion test; the electric assembly starts to work after receiving the signal, so that the heat-conducting base block is opened, and the solidified metal micro-droplets in the deep holes fall down to be used as a target material for a fusion test; the initial velocity of the molten metal droplets is greater than that of the solidified droplets, and the latter can be followed up under a completely weightless state to realize microgravity fusion.
The delay calculation method of the release signal of the solidified metal microdroplet is as follows:
as shown in FIG. 12, the difference in height between the ejection position of the molten metal droplet and the release position of the solidified metal droplet is h (set according to the test requirements), the difference in height between the release position of the solidified metal droplet and the position where the droplet is caused to strike the fusion is s, and the initial velocity of the molten metal droplet is v0(by testing, for example, using an image acquisition module to capture a picture of the molten metal droplet during ejection and performing image analysis on the first few pieces of molten metal droplets to obtain the diameter of the molten metal droplet and the initial velocity during ejection), the initial velocity of the solidified metal droplet is 0, and the accelerations a of the molten metal droplet and the solidified metal droplet are respectively1、a2(when the drop tube is in a vacuum state, there is a1＝a2G ═ g; when the drop tube is filled with inert gas, the influence caused by gas resistance needs to be considered); the molten droplet movement time until chase is t1The time of the movement of the coagulated droplet is t2(ii) a The frozen droplet release signal delay is Δ t, then:
△t＝t1-t2
solving the system of equations can yield corresponding Δ t and s, thereby controlling where fusing occurs. In consideration of errors caused by factors such as electric signal conduction, mechanism action and friction in actual test, the delta t can be corrected according to the test result. For example, an indicator lamp may be connected in parallel to a signal line of the release module, and during a test, a high-speed CCD camera is used to take a picture, the indicator lamp and the nozzle of the uniform metal droplet ejection module are placed in the same picture, and a time difference between a lighting frame of the indicator lamp and a frame of leaving the nozzle of the molten droplet, may be obtained, such that the control module sends a signal to the uniform metal droplet ejection module, and a delay Δ t between the start of movement of the molten droplet and the start of movement of the molten droplet1. Similarly, a delay between the control module signaling the frozen droplet release module to the beginning of the movement of the frozen droplet may be obtained. The measured delay deltat1. After correction, Δ t is the time difference required by the actual movement of the two droplets from the time when the control module sends a signal until the two droplets meet each other, so that
△t＝(t1+△t1)-(t2+△t2)
While the invention has been described with reference to specific embodiments, the invention is not limited thereto, and various equivalent modifications or substitutions can be easily made by those skilled in the art within the technical scope of the present disclosure.
Claims (8)
1. An apparatus for simulating the fusion of a molten droplet with a solidified droplet in a microgravity environment, comprising: the device comprises a control module, a uniform metal droplet jetting module, a solidified metal droplet releasing module and a position adjusting module, wherein the uniform metal droplet jetting module, the solidified metal droplet releasing module and the position adjusting module are arranged in a low-oxygen environment from top to bottom;
the uniform metal droplet ejection module is used for generating molten metal droplets and comprises an excitation component, a crucible, a heating component and a nozzle;
the crucible is used for containing metal raw materials, and the lower end of the crucible is provided with the nozzle; the heating assembly is used for heating the crucible to enable the metal raw material to be in a molten state; the excitation assembly is used for generating a driving force and providing an initial speed for the molten metal droplets sprayed out of the nozzle;
the solidified metal droplet release module is used for accommodating, preheating and releasing a solidified metal droplet and comprises an electric component and a heating component;
the heating assembly comprises a heat conduction base block, an electric heating tube and a thermocouple, wherein the electric heating tube is used for heating the heat conduction base block, and the thermocouple is used for measuring the temperature of the heat conduction base block; the heat conduction base block is composed of a first base block and a second base block which are symmetrically arranged, when the first base block and the second base block are folded, the middle part of the heat conduction base block penetrates along the vertical direction to form a deep hole, the deep hole comprises a cylindrical section and a conical section which are mutually communicated from top to bottom, and the diameters of the bottom surfaces of the cylindrical section and the conical section are equal; releasing the solidified metal droplets in the deep hole when the first base block and the second base block are separated;
the electric component is used for realizing the folding and the separation of the first base block and the second base block;
the position adjusting module is used for adjusting the spatial position of the solidified metal droplet release module so as to enable the falling tracks of the solidified metal droplet and the molten metal droplet to be overlapped and ensure microgravity fusion to occur in space;
the control module is used for controlling the uniform metal droplet spraying module and the solidified metal droplet releasing module so as to enable the solidified metal droplet to be coordinated with the movement of the molten metal droplet and ensure the microgravity fusion to occur in time.
2. The apparatus of claim 1, wherein the apparatus is configured to fuse a molten droplet to a solidified droplet in a simulated microgravity environment, wherein:
the electric assembly comprises a power element and power arms positioned on two opposite sides of the power element;
the two power arms are respectively connected with the first base block and the second base block through the heat insulation plates, and the first base block and the second base block are driven to fold and separate under the action of the power element.
3. The apparatus of claim 2, wherein the apparatus is configured to fuse the molten droplets to the solidified droplets in a simulated microgravity environment, wherein:
the opposite wall surfaces of the first base block and the second base block are coated with coatings for preventing molten metal from adhering, and the depth of a deep hole formed when the first base block and the second base block are folded is not less than 10 mm.
4. The apparatus of claim 3, wherein the apparatus is configured to fuse the molten droplets to the solidified droplets in a simulated microgravity environment, wherein:
the position adjusting module comprises a lifting assembly and a translation assembly;
the translation assembly is arranged above the lifting assembly through the adapter plate.
5. The apparatus of claim 4, wherein the apparatus is configured to fuse the molten droplets to the solidified droplets in a simulated microgravity environment, wherein:
the control module comprises a signal generator, an injection module signal wire and a release module signal wire;
the signal generator sends two paths of signals, the uniform metal droplet injection module and the solidified droplet release module are controlled by the injection module signal line and the release module signal line respectively, and the sequence and the interval time of the two paths of signals sent by the signal generator can be set;
the heating assembly further comprises a thermocouple for measuring the temperature of the thermally conductive block.
6. The apparatus for simulating the coalescence of molten and solidified droplets in a microgravity environment of any one of claims 1-5, wherein:
the low-oxygen environment is provided by a pipe dropping device, and the height of the pipe dropping device is not lower than 2.5 m;
the fusing device is arranged at the top end of the pipe falling device.
7. A method of performing a fusion test using an apparatus for simulating the fusion of a molten droplet with a solidified droplet in a microgravity environment according to any one of claims 1 to 6, comprising the steps of
1) Assembling and adjusting the fusion device according to the test requirement;
1.1) filling metal raw materials in a crucible of a uniform metal droplet jetting module, assembling each module, and placing the modules in a low-oxygen environment;
1.2) horizontally adjusting the spatial position of the solidified metal droplet release module through a position adjusting module to enable the nozzle to be coaxially arranged with the deep hole;
1.3) vertically adjusting the spatial position of the solidified metal droplet release module through a position adjusting module according to the test requirement;
2) manufacture of target material
2.1) starting the heating assembly to melt the metal raw material in the crucible;
2.2) controlling the excitation assembly to provide driving force through the control module, so that molten metal droplets are ejected from the nozzle, enter the deep hole and are solidified to form solidified droplets;
3) fusion test
3.1) preheating the solidified microdroplets through an electric heating pipe;
3.2) controlling the uniform metal droplet injection module to inject the molten metal droplets and the solidified metal droplet release module to release the solidified droplets to simulate fusion by the control module.
8. The method of performing a fusion test of claim 7, wherein:
the test requirements refer to the location where fusion is expected to occur and the shape and properties of the fused sample;
the fusion condition is optimized by adjusting the height difference between the spraying position of the uniform metal droplet spraying module and the releasing position of the solidified metal droplet releasing module and the time difference between the spraying of the uniform metal droplet spraying module and the releasing of the solidified metal droplet releasing module, so that the test requirement is met, and the fusion condition is determined.
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