An in-situ heating device for three-dimensional characterization of X-ray micro-CT

Abstract

The invention discloses an in-situ heating device for X-ray micro-CT three-dimensional characterization, wherein at least one pair of electrode holes, at least one pair of coaxial light-through holes and at least one temperature measuring port are arranged on the furnace shell, and the bottom end of the furnace shell has a sample entrance and exit; a heat preservation body is arranged inside the furnace shell, and the heat preservation body has holes corresponding to at least one pair of electrode holes, at least one pair of coaxial light-through holes, at least one temperature measuring port and the sample entrance and exit one by one; a furnace tube is arranged inside the furnace shell, and the furnace tube is fixed in the heat preservation body; the furnace tube has holes corresponding to at least one pair of coaxial light-through holes and the sample entrance and exit one by one, and a heating wire is wound around the outer wall of the furnace tube; a base is fixedly connected to the bottom of the furnace shell, and the base has a through hole coaxial with the sample entrance and exit. The device has a simple structure and is easy to use, and can heat metal samples while realizing X-ray micro-CT three-dimensional characterization of precipitation phases in the metal.

Description

Technical Field

[0001] The invention relates to the field of experimental devices for characterizing three-dimensional morphology of precipitation phases in metal materials, and in particular to an in-situ heating device for three-dimensional characterization of X-ray micro-CT. Background Art

[0002] The morphological characteristics of the precipitated phase in the metal have an important influence on its performance. The effective control of the precipitated phase is the key to improving the performance of metal materials, and the accurate characterization of the precipitated phase morphology is an important support for achieving its effective control. Studies have shown that heat treatment plays an important role in improving the morphology of the precipitated phase in the metal and optimizing the performance of metal materials. Therefore, it is of great significance to study the morphological evolution of the precipitated phase in metal materials during heating. However, the traditional two-dimensional plane observation method cannot accurately determine the morphology of the precipitated phase, quantitatively describe its size change, and cannot observe the changing behavior of the precipitated phase particles during heat treatment. At present, the confocal laser scanning microscope (CSLM) in-situ heating observation method is generally used to observe the morphological evolution of the precipitated phase in the metal, but it is limited by the resolution of the optical microscope and is affected by the interface energy of the polishing interface. Therefore, the morphology of the second phase in the metal cannot be accurately characterized using traditional methods.

[0003] In recent years, with the establishment of large-scale synchrotron radiation sources, domestic and foreign researchers have been able to use high-energy photon beams to detect defects and composition of metal materials. X-ray micro-CT non-destructive testing has the advantages of in-situ and real-time detection, and is becoming a new method for studying the three-dimensional morphology and structure of different phases in materials, and has been widely used in various fields. Therefore, the three-dimensional reconstruction and characterization of the precipitated phases in metals by X-ray micro-CT, especially the three-dimensional in-situ characterization of the morphological evolution of the precipitated phases during the heat treatment of metal materials, will establish new research methods and support for the effective control of the precipitated phases in metals.

[0004] To achieve the three-dimensional in-situ characterization of the morphological evolution of the precipitated phase during the heat treatment of metal materials, a heating device needs to be built on the synchrotron radiation light source X-ray micro-CT experimental platform. When the three-dimensional in-situ observation of the evolution behavior of the precipitated phase during the heat treatment is carried out, the metal material needs to be heated at high temperature and rotated at a certain step length for projection imaging to observe the change behavior of the precipitated phase. Therefore, an opening needs to be left under the heating device so that the sample can rotate. During the heat treatment experiment, the sample needs to be heated at high temperature to reach the required temperature. However, the metal sample undergoes surface oxidation at high temperature, which affects the three-dimensional observation of X-ray micro-CT. Therefore, the atmosphere in the heating device needs to be controlled and the heating device needs to be isolated from the air. The rotating sample stage of high-resolution X-ray micro-CT is close to the detector, and the experimental sample size is small. Therefore, in order not to affect the sample stage and detector of X-ray micro-CT and to have a high heating efficiency for small samples, the size of the heating device should not be too large and its surface temperature should not be too high. Summary of the invention

[0005] In view of the above problems existing in the prior art, the technical problem to be solved by the present invention is to provide a device capable of performing X-ray micro-CT three-dimensional characterization of the precipitated phase in the metal while heating the metal sample.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions: an in-situ heating device for X-ray micro-CT three-dimensional characterization, comprising a furnace cover, a furnace shell, a furnace tube and a base; the furnace cover is arranged on the top of the furnace shell and is sealed and connected to the furnace shell; the furnace shell is provided with at least one pair of electrode holes, at least one pair of coaxial light-through holes and at least one temperature measuring port, and the bottom end of the furnace shell has a sample entrance and exit; the furnace shell is provided with a heat preservation body, and the heat preservation body has holes corresponding to at least one pair of electrode holes, at least one pair of coaxial light-through holes, at least one temperature measuring port and the sample entrance and exit; the furnace tube is arranged in the furnace shell, and the furnace tube is fixed in the heat preservation body; the furnace tube has holes corresponding to at least one pair of coaxial light-through holes and the sample entrance and exit, and the outer wall of the furnace tube is wrapped with a heating wire; the base is fixedly connected to the bottom of the furnace shell, and the base has a through hole coaxial with the sample entrance and exit.

[0007] As an improvement, the furnace cover includes an inner furnace cover and an outer furnace cover which are sealed at the edges, and a furnace cover cavity is provided between the inner furnace cover and the outer furnace cover; the outer furnace cover is provided with a furnace cover water inlet and a furnace cover water outlet, and both the furnace cover water inlet and the furnace cover water outlet are connected to the furnace cover cavity.

[0008] As an improvement, the furnace shell includes an inner furnace shell and an outer furnace shell which are sealed at the edges, and a furnace shell cavity is provided between the inner furnace shell and the outer furnace shell; the outer furnace shell is provided with a furnace shell water inlet and a furnace shell water outlet, the furnace shell water inlet and the furnace shell water outlet are both connected to the furnace shell cavity, and the furnace shell water inlet is located at the bottom of the furnace shell, and the furnace shell water outlet is located at the top of the furnace shell.

[0009] As an improvement, the furnace shell also includes a plurality of water flow baffles, which are all arranged in the furnace shell cavity, and are arranged in sequence from top to bottom along the height direction of the furnace shell; the outer edge of the water flow baffle is sealed to the inner wall of the outer furnace shell, and the inner edge of the water flow baffle is sealed to the outer wall of the inner furnace shell; and there is a notch on the outer edge of the water flow baffle.

[0010] As an improvement, the furnace shell is provided with an air inlet hole, the top end of the furnace tube is provided with a top through hole, and the top through hole is connected with the air inlet hole through a gas pipeline; the heat preservation body is provided with a hole which is tightly matched with the gas pipeline.

[0011] As an improvement, the light-through hole and the temperature-measuring port are arranged at half the height of the furnace shell.

[0012] As an improvement, the axis of the light-through hole, the axis of the temperature measuring port and the axis of the electrode hole are perpendicular and located in the same plane, and the at least one pair of electrode holes is arranged opposite to at least one temperature measuring port.

[0013] As an improvement, the furnace tube includes a furnace tube body, which is a cylindrical structure. The top and the bottom of the furnace tube body are respectively fixedly connected to a fixing part, and the fixing part is a quadrangular prism structure with square upper and lower surfaces. A first partition plate and a second partition plate are provided between the top and the bottom of the furnace tube body, and the first partition plate and the second partition plate are sleeved on the outside of the furnace tube body, and the first partition plate and the second partition plate are respectively fixedly connected to the outer side wall of the furnace tube body. The heating wire is respectively wound on the furnace tube body between the top of the furnace tube and the first partition plate and on the furnace tube body between the bottom of the furnace tube and the second partition plate.

[0014] Compared with the prior art, the present invention has at least the following advantages:

[0015] 1. The light hole uses a high-temperature resistant polyimide film as a window, which can not only seal the heating device to isolate the air, but also does not affect the transmittance of X-rays.

[0016] 2. The device uses platinum wire as the heating wire. The properties of platinum wire are extremely stable and it is not easy to oxidize even in high temperature environments. In addition, platinum wire has a high melting point and good thermal conductivity. After it is tightly wrapped around the BN furnace tube, it transfers heat quickly and has extremely high thermal efficiency.

[0017] 3. The furnace tube is made of BN (white graphite) with good insulation and excellent thermal conductivity, and has threads, which can not only ensure that the heating wire wound on the furnace tube thread will not short-circuit, but also quickly transfer the heat from the heating wire to the sample.

[0018] 4. Three layers of water flow baffles are welded between the inner and outer furnace shells to control the direction of water flow, so as to ensure that there is no dead angle for water flow between the two furnace shell interlayers. The baffle is in the shape of a ring, and there are two notches symmetrical about the diameter on the ring to allow water flow to pass through. The line connecting the two notches of the lower baffle is perpendicular to the line connecting the two notches of the upper baffle.

[0019] 5. The furnace shell is provided with an air flow channel from the outside to the furnace cavity, and the corresponding position on the heat preservation body is provided with an air flow channel leading to the furnace tube. During the high-temperature in-situ experiment, inert gas is blown into the furnace tube through the air flow channel to prevent the sample from being oxidized after high-temperature heating.

[0020] 6. When the electrodes and thermocouples are assembled into the heating furnace, they are sealed with O-rings through hollow bolts to prevent air from entering the furnace and oxidizing the samples.

[0021] 7. When the shell and the upper cover are assembled, a silicone gasket is placed between the two to seal the furnace cavity to prevent air from entering and oxidizing the sample after high-temperature heating.

[0022] 8. The in-situ heating device provided by the present invention has a furnace tube vertically placed on a heat-insulating body in a furnace cavity. During the experiment, a sample placed on a sample support rod is inserted into the furnace tube through a hole at the bottom of the heating furnace. Thereafter, the sample is energized and heated by a heating wire wound on the furnace tube. At the same time, the support rod is rotated according to a certain step length by a rotating device on the test bench to realize projection imaging of the sample.

[0023] 9. The in-situ heating device provided by the present invention inserts the thermocouple deep into the furnace tube and fixes it on the furnace shell, which leads to the outside of the furnace shell through a reserved channel. The temperature change in the furnace can be measured in real time, and it can be connected to a temperature control meter to display the real-time temperature and control the voltage of the heating wire through an adjustable voltage-stabilized constant-current switching power supply, so as to achieve the purpose of automatically and smoothly adjusting the temperature, with high adjustment accuracy and saving manpower. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is the front view of the in-situ heating device.

[0025] Figure 2 for Figure 1 Cross-sectional view at CC.

[0026] Figure 3 for Figure 1 Left view of .

[0027] Figure 4 for Figure 1 Top view of the .

[0028] Figure 5 This is the front view of the furnace tube.

[0029] Figure 6 Schematic diagram of experimental equipment for X-ray micro-CT experiment when using the in-situ heating device of the present invention.

[0030] In the figure, furnace cover 10, furnace cover water inlet 11, first skirt corner 12, furnace cover water outlet 13, furnace cover cavity 15; furnace shell 20, furnace shell cavity 20a, insulation body 20b, furnace shell water inlet 21, electrode hole 22, furnace shell water outlet 23, light hole 24, blue disk 24a, water flow baffle 25, temperature measuring port 26, air inlet 29; furnace tube 30, fixing part 31, first partition plate 32, second partition plate 34, heating wire 37; base 40, sample support rod 50. DETAILED DESCRIPTION

[0031] The present invention is described in further detail below.

[0032] See also Figures 1 to 5 An in-situ heating device for X-ray micro-CT three-dimensional characterization includes a furnace cover 10, a furnace shell 20, a furnace tube 30 and a base 40.

[0033] The furnace cover 10 is arranged on the top of the furnace shell 20, and the furnace cover 10 is sealed and connected to the furnace shell 20; in specific implementation, the lower edge of the furnace cover 10 has a circle of first skirt corners 12, and the first skirt corners 12 have multiple connection holes. The furnace shell 20 is a cylindrical structure, and the top edge of the furnace shell 20 also has a circle of second skirt corners, and the second skirt corners also have multiple connection holes. The furnace shell 20 and the furnace cover 10 are connected by bolts passing through the connection holes on the first skirt corners 12 and the second skirt corners. In addition, a sealing rubber ring can be arranged between the first skirt corners and the second skirt corners to achieve sealing.

[0034] The function of the furnace cover 10 is to seal the top of the furnace shell 20. However, in order to prevent the furnace cover 10 from overheating and causing unknown dangers during the heating process, the furnace cover 10 can be designed as follows: the furnace cover 10 includes an inner furnace cover and an outer furnace cover connected by edge sealing, and there is a furnace cover cavity between the inner furnace cover and the outer furnace cover; the outer furnace cover has a furnace cover water inlet 11 and a furnace cover water outlet 13, and the furnace cover water inlet 11 and the furnace cover water outlet 13 are both connected to the furnace cover cavity. The furnace cover 10 is designed as a double-layer structure, and a sealed furnace cover cavity is formed by the inner furnace cover and the outer furnace cover. When in use, the furnace cover 10 is cooled by continuously injecting cooling water or coolant into the furnace cover, or by injecting cooling water or coolant for circulation.

[0035] The furnace shell 20 is provided with a pair of electrode holes 22, a pair of coaxial light holes 24 and a temperature measuring port 26, and the bottom end of the furnace shell 20 has a sample entrance and exit; the furnace shell 20 has a heat preservation body 20b, and the heat preservation body has holes corresponding to the pair of electrode holes 22, the pair of coaxial light holes 24, the temperature measuring port 26 and the sample entrance and exit. In specific implementation, the heat preservation body can be made of refractory material.

[0036] A heat-insulating body is arranged in the furnace shell 20, and the heat-insulating body separates the furnace tube 30 from the furnace shell. The heat-insulating body can prevent the heat loss in the furnace tube on the one hand, and can also play a certain heat-insulating role on the other hand to prevent the furnace shell temperature from being too high. However, even so, when using the in-situ heating device, the furnace shell is still prone to overheating. In order to reduce the danger, the furnace shell can be designed as the following structure:

[0037] The furnace shell 20 includes an inner furnace shell and an outer furnace shell which are sealed at the edges, and a furnace shell cavity is provided between the inner furnace shell and the outer furnace shell; the outer furnace shell is provided with a furnace shell water inlet 21 and a furnace shell water outlet 23, and the furnace shell water inlet 21 and the furnace shell water outlet 23 are both connected to the furnace shell cavity, and the furnace shell water inlet 21 is located at the bottom of the furnace shell 20, and the furnace shell water outlet 23 is located at the top of the furnace shell 20. When in use, cooling water or coolant is injected into the furnace shell through the furnace shell water inlet 21, and the injection is uninterrupted. The furnace shell water outlet 23 is set on the top of the furnace shell to allow the cooling water or coolant to wrap the entire furnace shell 20 as much as possible, so as to achieve a better cooling effect. In specific implementation, a cooling circulation system can be set up, and the hot cooling water coming out of the water outlets of the furnace shell 20 and the furnace cover 10 is input into the heat exchanger, and the water output from the cold water outlet of the heat exchanger enters the water storage tank, and then the cold water in the water storage tank is pumped into the furnace shell cavity and the furnace cover cavity through a water pump, thereby realizing the recycling of cooling water.

[0038] As an improvement, in order to enhance the cooling effect of cooling water and allow the cooling water to circulate in the furnace shell cavity, a plurality of water flow baffles 25 may be added in the furnace shell. Specifically, the plurality of water flow baffles 25 are all arranged in the furnace shell cavity, and the plurality of water flow baffles 25 are arranged in sequence from top to bottom along the height direction of the furnace shell 20; the outer edge of the water flow baffle 25 is sealed and connected to the inner side wall of the outer furnace shell, and the inner edge of the water flow baffle 25 is sealed and connected to the outer side wall of the inner furnace shell; and there is a notch on the outer edge of the water flow baffle 25. In specific implementation, there may be three water flow baffles 25, and the intervals between two adjacent water flow baffles 25 in the vertical direction are equal. The furnace shell cavity is divided into four independent sub-furnace shell cavities by three water flow baffles 25, and two adjacent sub-furnace shell cavities are connected through the notch on the water flow baffle 25, so as to realize the flow of cooling water in different sub-furnace shell cavities.

[0039] During the heating process, the sample is placed in the furnace tube 30, and there is air in the furnace tube 30, which makes it easy for the sample to be oxidized. Therefore, the following design is made: the furnace shell 20 has an air inlet 29, and the top of the furnace tube 30 has a top through hole, which is connected to the air inlet 29 through a gas pipeline; the insulation body has a hole that fits tightly with the gas pipeline. When in use, inert gas is continuously introduced into the furnace tube through the air inlet 29 to remove the air in the furnace tube, so that the sample can be tested under a protective gas atmosphere, and the air introduced into the furnace tube and discharged from the sample inlet and outlet below the furnace tube.

[0040] For the convenience of observation, the light through hole 24 and the temperature measuring port 26 are arranged at half the height of the furnace shell 20 .

[0041] The outer side of the light-through hole 24 can be made into a flange shape 24a, which is sealed with a polyimide film having certain high temperature resistance. The polyimide window is sandwiched between two silicone sheets, and the silicone is fixed to the flange with bolts to prevent air from entering.

[0042] The axis of the light-through hole 24, the axis of the temperature measuring port 26 and the axis of the electrode hole 22 are perpendicular and located in the same plane. The at least one pair of electrode holes 22 is arranged opposite to at least one temperature measuring port 26. The purpose of arranging the light-through hole, the temperature measuring port and the electrode hole in the same plane is to make the temperature measuring port and the light-through hole of the furnace tube in the same plane, so that more heating wires can be wound on the furnace tube to ensure heating efficiency.

[0043] The furnace tube 30 is arranged in the furnace shell 20, and the furnace tube 30 is fixed in the insulation body; in specific implementation, the insulation body includes two parts, upper and lower, and a groove with a square cross section is opened in the upper and lower insulation bodies, the furnace tube 30 is stuck in the groove, and the opening position of the groove is close to the upper half of the lower insulation body and the lower half of the upper insulation body, and a through hole is opened at the bottom of the groove as a channel for sample entry and exit, and the through hole is coaxial with the sample entry and exit hole on the furnace tube 30. Then the furnace tube 30 is placed in the through hole, and the furnace tube 30 is tightly matched with the through hole, so as to realize the fixation of the furnace tube 30. The furnace tube 30 has holes corresponding to a pair of coaxial light holes 24 and the sample entrance and exit, and the outer wall of the furnace tube 30 is wound with a heating wire 37.

[0044] The furnace tube 30 is made of BN (white graphite) with good insulation and excellent thermal conductivity, and the outer wall of the furnace tube 30 has threads. As an improvement, the furnace tube 30 specifically adopts the following structure:

[0045] The furnace tube 30 includes a furnace tube body, which is a cylindrical structure. The top and the bottom of the furnace tube body are respectively fixedly connected to a fixing part 31, and the fixing part 31 is a quadrangular prism structure with square upper and lower surfaces. A first partition plate 32 and a second partition plate 34 are provided between the top and the bottom of the furnace tube body. The first partition plate 32 and the second partition plate 34 are sleeved on the outside of the furnace tube body, and the first partition plate 32 and the second partition plate 34 are respectively fixedly connected to the outer wall of the furnace tube body. The heating wire 37 is respectively wound on the furnace tube body between the top of the furnace tube 30 and the first partition plate 32 and on the furnace tube body between the bottom of the furnace tube 30 and the second partition plate 34. The heating wire 37 adopts a platinum heating wire with a higher melting point. The heating wire 37 is connected to an external power source through a copper electrode to supply power to the inside. In order to prevent the electrode from contacting the furnace shell 20 and causing the furnace shell 20 to be charged, a corundum tube is sleeved at the contact between the electrode and the furnace shell 20. In addition, an O-ring is sleeved on the electrode and fixed to the furnace shell 20 by a hollow bolt, and the contact between the hollow bolt and the electrode is also insulated by a corundum tube. In specific implementation, the heating wire 37 is a single heating wire, which is wound around the furnace tube body between the top end of the furnace tube 30 and the first partition plate 32, passes through the first partition plate 32 and the second partition plate 34, and continues to be wound around the furnace tube body between the lower end of the furnace tube 30 and the second partition plate 34.

[0046] The furnace tube 30 can be divided into three parts, namely, a fixing part 31, an observation part and a heating part; the heating part is composed of two parts, one part is the furnace tube body between the fixing part 31 at the top of the furnace tube and the first partition plate 32, and the other part is the furnace tube body between the fixing part 31 at the bottom of the furnace tube and the second partition plate 34; the furnace tube body between the first partition plate 32 and the second partition plate 34 is the observation part, and when the in-situ heating device is used, the sample is fixed in the observation part through the sample support rod 50. There are through holes at the top and bottom of the furnace tube body, the top through hole is used for sealing connection with the gas pipeline, and the bottom through hole is used for putting in and taking out the sample.

[0047] The fixing part 31 is designed as a quadrangular prism structure with both upper and lower surfaces being square, mainly for the convenience of processing and fixing, and both upper and lower surfaces being square can effectively prevent the furnace tube body from rotating, and the stability is better. In addition, the diameter of the cross section of the furnace tube body is smaller than the diameter of the inscribed circle of the fixing part 31, so that sufficient space is formed between the fixing part 31 at the top of the furnace tube and the first partition plate 32 and between the fixing part 31 at the bottom of the furnace tube and the second partition plate 34 to wind the heating wire 37, and at the same time, direct contact between the heating wire 37 and the heat preservation body can be avoided as much as possible.

[0048] The base 40 is fixedly connected to the bottom of the furnace shell 20, and has a through hole coaxial with the sample inlet and outlet. In specific implementation, the base 40 can be a cylindrical structure, with a circle of skirt angles at the bottom of the base 40, and a connection hole is provided on the skirt angle, so that the base 40 can be stably connected to other experimental devices by bolts during use. For the stability of the connection, the top of the base 40 can be welded to the bottom of the furnace shell 20.

[0049] The use process of the in-situ heating device provided by the present invention is as follows:

[0050] Schematic diagram of the experimental equipment for X-ray micro-CT experiment Figure 6 As shown, the heating device is set up at the position marked by the box. During the experiment, the base 40 is fixed on the electric guide rail, and the sample is clamped on the six-axis CNC sample clamp through the sample support rod. The sample is adjusted to the path of the X-ray beam through the sample clamp, and then the sample port of the in-situ heating device is aligned with the sample through the electric guide rail and then lowered until the X-ray beam, the light hole, and the center of the sample are on the same straight line. Then, argon gas is introduced to evacuate the air in the furnace tube, and the sample is heated by electricity. After the sample reaches the required temperature, the six-axis CNC sample holder drives the sample on the sample support rod to rotate at a certain step length to achieve projection imaging of the sample.

[0051] Specifically, firstly, two electrodes are respectively inserted through the electrode holes 22 and electrically connected to the heating wire 37, then the base 40 is fixed on the experimental bench, and then the sample is placed on the top of the sample support rod, and the sample support rod carries the sample into the through hole on the base 40, and then passes through the sample entrance and exit on the furnace shell 20, the corresponding through hole on the insulation body and the through hole at the bottom of the furnace tube 30 in sequence, and then enters the furnace tube 30 at the same height as the light hole 24. At this time, the sample in the furnace tube 30 can be seen through the light hole 24. Inert gas is introduced to remove the air in the furnace tube 30, and the heating wire 37 is powered on for heating. At the same time, the bottom of the sample support rod is fixed on the rotating device on the experimental bench and rotated according to a certain step length to realize the projection imaging of the sample.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. An in-situ heating device for three-dimensional characterization of X-ray micro-CT, characterized in that: It comprises a furnace cover (10), a furnace shell (20), a furnace tube (30) and a base (40); The furnace cover (10) is arranged on the top of the furnace shell (20) and is sealed and connected to the furnace shell (20); The furnace shell (20) is provided with at least one pair of electrode holes (22), at least one pair of coaxial light holes (24) and at least one temperature measuring port (26), and the bottom end of the furnace shell (20) is provided with a sample inlet and outlet; The furnace shell (20) has a heat-insulating body inside, and the heat-insulating body has holes corresponding to at least one pair of electrode holes (22), at least one pair of coaxial light-through holes (24), at least one temperature measuring port (26), and a sample inlet and outlet; The furnace tube (30) is arranged in the furnace shell (20), and the furnace tube (30) is fixed in the heat preservation body; The furnace tube (30) has holes corresponding to at least one pair of coaxial light-through holes (24) and the sample inlet and outlet, and a heating wire (37) is wound around the outer wall of the furnace tube (30); The base (40) is fixedly connected to the bottom of the furnace shell (20), and the base (40) has a through hole coaxial with the sample inlet and outlet; The furnace shell (20) comprises an inner furnace shell and an outer furnace shell which are connected by sealing at the edges, and a furnace shell cavity is provided between the inner furnace shell and the outer furnace shell; the outer furnace shell is provided with a furnace shell water inlet (21) and a furnace shell water outlet (23), the furnace shell water inlet (21) and the furnace shell water outlet (23) are both connected to the furnace shell cavity, and the furnace shell water inlet (21) is located at the bottom of the furnace shell (20), and the furnace shell water outlet (23) is located at the top of the furnace shell (20); The furnace shell (20) further comprises a plurality of water flow baffles (25), the plurality of water flow baffles (25) are all arranged in the furnace shell cavity, and the plurality of water flow baffles (25) are arranged in sequence from top to bottom along the height direction of the furnace shell (20); the outer edge of the water flow baffle (25) is sealedly connected to the inner side wall of the outer furnace shell, and the inner edge of the water flow baffle (25) is sealedly connected to the outer side wall of the inner furnace shell; the outer edge of the water flow baffle (25) has a notch, there are three water flow baffles (25), and the intervals between two adjacent water flow baffles (25) in the vertical direction are equal, and the furnace shell cavity is divided into four independent sub-furnace shell cavities by the three water flow baffles (25); The furnace tube (30) comprises a furnace tube body, which is a cylindrical structure. The top and bottom ends of the furnace tube body are respectively fixedly connected to a fixing part (31), and the fixing part (31) is a quadrangular prism structure with both upper and lower surfaces being square. A first partition plate (32) and a second partition plate (34) are provided between the top and bottom ends of the furnace tube body, and the first partition plate (32) and the second partition plate (34) are sleeved on the outside of the furnace tube body, and the first partition plate (32) and the second partition plate (34) are respectively fixedly connected to the outer wall of the furnace tube body. The heating wire (37) is respectively wound around the furnace tube body between the top end of the furnace tube (30) and the first partition plate (32) and the furnace tube body between the bottom end of the furnace tube (30) and the second partition plate (34).

2. The in-situ heating device for X-ray micro-CT three-dimensional characterization according to claim 1, characterized in that: The furnace cover (10) comprises two layers, an inner furnace cover and an outer furnace cover, the edges of which are sealed and connected, and a furnace cover cavity is provided between the inner furnace cover and the outer furnace cover; The outer furnace cover is provided with a furnace cover water inlet (11) and a furnace cover water outlet (13), and the furnace cover water inlet (11) and the furnace cover water outlet (13) are both communicated with the furnace cover cavity.

3. The in-situ heating device for X-ray micro-CT three-dimensional characterization according to claim 2, characterized in that: The furnace shell (20) is provided with an air inlet hole (29), and the top end of the furnace tube (30) is provided with a top through hole, and the top through hole is connected with the air inlet hole (29) through a gas pipeline; The heat-insulating body is provided with a hole which is tightly matched with the gas pipeline.

4. The in-situ heating device for X-ray micro-CT three-dimensional characterization according to claim 1, characterized in that: The light-through hole (24) and the temperature measuring port (26) are arranged at half the height of the furnace shell (20).

5. The in-situ heating device for X-ray micro-CT three-dimensional characterization according to claim 1, characterized in that: The light through hole (24) is sealed with a polyimide film having certain high temperature resistance properties.

6. The in-situ heating device for X-ray micro-CT three-dimensional characterization according to claim 1, characterized in that: The axis of the light-through hole (24), the axis of the temperature measuring port (26) and the axis of the electrode hole (22) are perpendicular and located in the same plane, and the at least one pair of electrode holes (22) is arranged opposite to at least one temperature measuring port (26).

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