X-ray-based 3D imaging in-situ stretching high-temperature device

Abstract

The invention discloses an X-ray-based 3D imaging in-situ stretching high-temperature device which comprises a high-temperature heating device and a stretching mechanism, the high-temperature heating device is arranged on one side of the stretching mechanism, and the high-temperature heating device is communicated with the stretching mechanism; the stretching mechanism comprises an upper clamp, a light-transmitting cylinder, a lower clamp, a square supporting cylinder and a tension bar, the lower end of the square supporting cylinder is connected with the loading mechanism in a sealed mode, an annular part is arranged on the periphery of the upper clamp, the upper end of the light-transmitting cylinder abuts against the annular part of the upper clamp, the lower end of the light-transmitting cylinder abuts against the annular part of the upper end of the square supporting cylinder, and the tension bar is connected with the lower clamp. The lower end of the square supporting cylinder is in sealed connection with the upper end of the loading mechanism, a through hole is formed in the top of the upper clamp, and a sample clamping part is further arranged at the lower end of the upper clamp; according to the high-temperature heating device, a sample is heated in a heat convection manner, so that the efficiency and the accuracy of a high-temperature tensile test are improved, and the tensile test of in-situ observation under a high-temperature condition is met.

Description

Technical Field

[0001] The present invention relates to the field of X-ray microscopic imaging and material research technology, and in particular to a high-temperature device for in-situ stretching of 3D imaging based on X-rays. Background Art

[0002] With the development of the third-generation synchrotron X-ray imaging technology, fast computed tomography (CT) technology has been able to provide higher temporal and spatial resolution, and can realize in situ observation of four-dimensional tissue evolution as tissue changes with external conditions (such as in situ solidification, in situ deformation, etc.). It has both industrial value and scientific significance and has attracted more and more attention.

[0003] In materials science, CT technology can observe defects (cracks, holes, inclusions) inside optically opaque samples with a spatial resolution close to that of an optical microscope. Due to its non-destructive nature, CT imaging is often used in in-situ experiments to monitor the evolution of material microstructures under various experimental conditions.

[0004] However, performance tests at room temperature are often insufficient to meet the research needs of special materials. Currently, Ti, Ni-based alloys, and even carbon-based composite materials used in high-temperature fields are subjected to ultra-high temperature environments of 2000°C. The true performance of components under complex and extreme service conditions urgently requires adjustable high-temperature testing equipment, so as to conduct in-situ observations of the material microstructure evolution, failure process, and crack propagation path under complex service environments. At present, the research on external temperature field devices for in-situ observation equipment is limited. For tests with high temperature accuracy requirements, existing test equipment cannot meet the precise control of the temperature field.

[0005] In view of this, an in-situ stretching high-temperature device capable of accurately controlling the temperature is developed to solve the above technical problems. Summary of the invention

[0006] The purpose of the present invention is to provide a high-temperature device for in-situ stretching of 3D imaging based on X-rays, so as to solve the problem raised in the above background technology that there is currently no X-ray 3D imaging in-situ device on the market that can create a high-temperature experimental environment.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A high-temperature device for in-situ stretching of 3D imaging based on X-rays comprises a high-temperature heating device and a stretching mechanism, wherein the high-temperature heating device is arranged on one side of the stretching mechanism, and the high-temperature heating device is connected to the stretching mechanism.

[0009] Furthermore, the stretching mechanism includes an upper clamp, a light-transmitting tube, a lower clamp, a square support tube and a tension rod, the lower end of the square support tube is sealedly connected to the loading mechanism, the outer periphery of the upper clamp is provided with an annular portion, the upper end of the light-transmitting tube supports the annular portion of the upper clamp, the lower end of the light-transmitting tube abuts against the upper annular portion of the square support tube, the lower end of the square support tube is sealedly connected to the upper end of the loading mechanism, a through hole is provided at the top of the upper clamp, and a sample clamping portion is also provided at the lower end of the upper clamp; the loading mechanism and the tension rod are threadedly connected, and the tension rod extends into the square support tube and is threadedly connected to the lower clamp.

[0010] Furthermore, the light-transmitting tube and the square supporting tube are provided with a hollow cavity, and the light-transmitting tube and the square supporting tube are communicated with each other; the square supporting tube accommodates an inner air pipe for conveying high-temperature inert gas and blocking heat, the inner air pipe is made of heat-insulating material, a square groove is opened on one side of the inner air pipe, and the groove is sealed by an airway cover, so as to realize gas conveyance.

[0011] Furthermore, the high-temperature heating device includes a heater shell, a heater shell bottom cover, an insulating shell, a heater and a ceramic insulating pad. The insulating shell is connected to the inner air pipe through an external air duct. The insulating shell and the external air duct are fastened by a heater bracket. One end of the heater bracket is threadedly connected to the upper end of the high-temperature heating device, and the other end is threadedly connected to the upper end of the loading mechanism. The heater shell and the insulating shell are threadedly connected, and the heater shell is encapsulated outside the insulating shell; the high-temperature heating device is located on the side of the loading mechanism.

[0012] Furthermore, the interfaces between the heat-insulating outer shell and the outer air duct, and between the outer air duct and the inner air duct are coated with sealing heat-insulating materials.

[0013] Furthermore, the heater is placed inside the heat-insulating outer shell, and the heat-insulating outer shell is connected to the bottom cover of the heater shell by threaded sealing.

[0014] Furthermore, the bottom end of the heater has two terminal posts, and the external wires pass through two through holes on the bottom cover of the heater shell with ceramic insulating pads. The bottom cover of the heater shell is provided with a PT1 / 8 threaded hole for connecting a right-angle equal-diameter quick-connect connector that can be connected to an external air pipe.

[0015] The design idea of ​​the present invention is as follows: the heat-insulating outer shell transports the gas heated by the heater to the inner air pipe through the outer air duct, and transmits it to the test space through the upper part of the square support tube, forming a gas transmission path. The compact built-in gas transmission path effectively ensures that there will be no interference between the X-ray generating device and the light-transmitting tube, thereby greatly improving the resolution.

[0016] By using the above technical solution, the present invention has the following advantages compared with the prior art:

[0017] 1) The present invention utilizes heating of the inert gas to keep the temperature of the sample stable during the test process, and the equipment is easy to install and disassemble, has a small size and high adaptability.

[0018] 2) The present invention controls the temperature by adjusting the voltage across the heater while introducing the protective gas, applies the load through the loading platform, and can accurately control the temperature within a wide temperature range. In addition, in-situ high-temperature tensile CT characterization can be achieved by imaging during the deformation process.

[0019] 3) The high temperature heating device of the present invention heats the sample by thermal convection, thereby improving the efficiency and accuracy of the high temperature tensile test and meeting the requirements of the tensile test for in-situ observation under high temperature conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional structural diagram of the present invention;

[0021] Figure 2 is a cross-sectional view of the device of the present invention;

[0022] Figure 3 is a bottom view of the device of the present invention;

[0023] In the figure: 1. upper fixture; 2. light-transmitting tube; 3. square support tube; 4. heater bracket; 5. heater shell; 6. heater shell bottom cover; 7. loading mechanism; 8. specimen; 9. lower fixture; 10. inner air pipe; 11. tension rod; 12. airway cover; 13. outer air guide pipe; 14. heat-insulating shell; 15. heater; 16. ceramic insulating pad; 17. thermocouple. DETAILED DESCRIPTION

[0024] The following will be combined with the accompanying drawings in the examples of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] Example 1: See Figure 1 As shown, a high-temperature device for in-situ stretching of 3D imaging based on X-rays includes a stretching mechanism, a loading mechanism and a high-temperature heating device. The high-temperature heating device includes a heater shell 5, a heater shell bottom cover 6, a heat-insulating shell 14, a heater 15, and a ceramic insulating pad 16. The heater 15 is fixed in the heat-insulating shell 14 and just presses against the upper part of the heat-insulating shell 14. The wire passes through the ceramic insulating pad 16 and is connected to the heater 15 terminal. The temperature mechanism is fixed to one side of the loading mechanism, and the stretching mechanism is fixed to the upper part of the loading mechanism.

[0026] In this embodiment, a square hole is opened at the top of the insulating outer shell 14, the lower end of the outer air duct 13 is connected to the square hole at the top of the insulating outer shell 14, and the other end of the outer air duct 13 is connected to the square hole reserved in the inner air pipe 10. The outer air duct 13 and the insulating outer shell 14 are threadedly fastened using the heater bracket 4.

[0027] In this embodiment, see Figure 2 As shown, the stretching mechanism includes an upper clamp 1, a light-transmitting tube 2, a lower clamp 9, a square support tube 3, a tension rod 11 and a loading mechanism 7. The square support tube 3 is fixed to the top of the shell of the loading mechanism by screws, and the lower clamp 9 is connected to the upper end of the tension rod 1 of the loading mechanism by threads. At this time, the lower clamp 9 and the tension rod 11 are on the same axis, and the tension rod 11 passes through the guide hole reserved in the upper cover of the loading mechanism 7.

[0028] In this embodiment, the loading mechanism includes a shell and a loading device arranged in the shell. The loading device provides power output for the stretching mechanism. The loading device selects an existing conventional power output device, such as the loading device described in patent application number 2021107517574, or other loading mechanisms. There is no specific limitation on it, which can meet the experimental requirements of this technical solution.

[0029] In this embodiment, the high-temperature heating device includes a heater shell 5, a heater shell bottom cover 6, an insulating shell 14, a heater 15, and a ceramic insulating pad 16. The insulating shell 14 is connected to the inner air pipe 10 through an outer air duct 13. The insulating shell 14 and the outer air duct 13 are fastened through a heater bracket 4. The other end of the heater bracket 4 is threadedly connected to the upper end of the loading mechanism 7. The heater shell 5 and the insulating shell 14 are threadedly connected.

[0030] The high-temperature heating device is located on the side of the loading mechanism 7, and the high-temperature heating device will not interfere with the X-ray 3D imaging in-situ tensile test in space; specifically: sufficient space is reserved between the bottom cover 6 of the heater shell of the high-temperature heating device and the bottom surface of the loading mechanism 7 to ensure the space margin for clamping the device on the test bench.

[0031] In this embodiment, the interfaces between the heat-insulating outer shell 14, the outer air duct 13 and the inner air duct 10 are coated with sealing insulation material; the heat-insulating outer shell 14 is made of cement insulation material, which effectively blocks the heat exchange between the environment and the heater, thereby ensuring the temperature stability of the test space.

[0032] In this embodiment, the lower clamp 9 is a threaded tensile clamp, and a through hole is provided at the top of the upper clamp 1 for exhaust.

[0033] In this embodiment, an inner air pipe 10 is provided inside the square support tube 3. The inner air pipe 10 is made of heat insulating material to reduce heat exchange with the outside.

[0034] In this embodiment, a thermocouple 17 is provided in the stretching mechanism for measuring temperature. The thermocouple 17 is provided at the lower end of the upper fixture 1, close to the parallel section of the stretching specimen.

[0035] In order to explain this embodiment more clearly, the working principle and process of the device are described in detail below:

[0036] Working principle:

[0037] Inert gas at room temperature is passed through the bottom of the high-temperature heating device to heat the inert gas. The thermocouple inside the stretching mechanism is used to control the temperature measurement. The high-temperature inert gas flows to the inner air pipe through the preset air channel inside the insulation shell, and then the high-temperature inert gas fills the space around the tensile test specimen to heat the tensile specimen. Finally, the inert gas is discharged from the air vents of the upper fixture to the external environment.

[0038] Working process:

[0039] Prepare the plate-shaped tensile specimen specified by the tensile fixture, fix the tensile specimen on the upper fixture 1, and then raise the lower fixture 9 to place the tensile specimen in the upper fixture 1 and the lower fixture 9. At this time, the specimen has been installed.

[0040] According to the requirements, a high temperature test is carried out, and the heater 15 is turned on (the wire is connected to the heater 15 through a ceramic insulating pad 16) to achieve heating. During this process, an inert gas at room temperature is continuously introduced into the external pipe provided at the bottom of the heater 15. The high-temperature inert gas flows through the preset air channel inside the heat-insulating shell 14 through the external air duct 13 to the internal air pipe 10, and then flows out from the internal air pipe 10. The high-temperature inert gas fills the space around the tensile test specimen to heat the tensile specimen. At this time, the heated inert gas will uniformly heat the material, and the temperature of the specimen can be read by the thermocouple 17. At this time, the voltage at both ends of the heater can be adjusted to achieve stable control at a certain temperature, and the high-temperature inert gas that heats the specimen is discharged through the exhaust hole of the upper fixture 1.

[0041] After the test temperature parameters are determined, the device can be placed in an X-ray microscope device for loading and in-situ observation.

[0042] After setting various X-ray parameters, start X-ray CT scanning. After the experiment is over, the captured images are post-processed to obtain 3D imaging of the experimental object, and relevant analysis and research are performed on it. The contents not described in detail in this manual belong to the existing technology known to professional and technical personnel in this field.

[0043] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A high temperature device for in-situ stretching based on X-ray 3D imaging, characterized in that: The invention comprises a high-temperature heating device and a stretching mechanism, wherein the stretching mechanism comprises an upper clamp (1), a light-transmitting tube (2), a lower clamp (9), a square support tube (3) and a loading mechanism (7); the upper clamp (1) is limitedly arranged at the upper end of the light-transmitting tube (2), and a through hole communicating with the outside is opened on the upper clamp (1); the lower end of the light-transmitting tube (2) is limitedly arranged at the upper end of the square support tube (3), the lower end of the square support tube (3) is sealedly connected to the upper end of the loading mechanism (7), and the tension rod (11) of the loading mechanism (7) extends into the square support tube (3) and is fixedly connected to the lower clamp (9); the light-transmitting tube (2) and the square support tube (3) are both provided with hollow cavities, and the hollow cavities of the two are connected; the square support tube (3) contains an inner air pipe (10) for conveying high-temperature inert gas and blocking heat, and the stretching mechanism is connected to the high-temperature heating device through the inner air pipe (10).

2. The high temperature device for in-situ stretching based on X-ray 3D imaging according to claim 1, characterized in that: The high-temperature heating device comprises a heater shell (5), a heater shell bottom cover (6), a heat-insulating shell (14) and a heater (15); the heater (15) is arranged inside the heat-insulating shell (14), the heater shell (5) and the heat-insulating shell (14) are connected by threads, and the heater shell (5) is encapsulated outside the heat-insulating shell (14), and the heat-insulating shell (14) and the heater shell bottom cover (6) are connected by threads and sealing.

3. The high temperature device for in-situ stretching based on X-ray 3D imaging according to claim 2, characterized in that: The heat-insulating outer shell (14) and the inner air pipe (10) are in communication via an outer air pipe (13), and the heat-insulating outer shell (14) and the outer air pipe (13) are fastened via a heater bracket (4); one end of the heater bracket (4) is connected to the other end of the heat-insulating outer shell (14), and the other end is connected to a loading mechanism (7).

4. The high temperature device for in-situ stretching based on X-ray 3D imaging according to claim 2, characterized in that: The bottom end of the heater (15) has two terminal blocks, and external wires are passed through two through holes on the bottom cover (6) of the heater shell and provided with ceramic insulating pads (16). The bottom cover (6) of the heater shell is provided with a threaded hole for externally connecting an air pipe.

5. The high temperature device for in-situ stretching based on X-ray 3D imaging according to claim 1, characterized in that: The high-temperature heating device is arranged on one side of the loading mechanism (7), and an installation gap is arranged between the heater shell bottom cover (6) and the loading mechanism (7).

6. The high temperature device for in-situ stretching based on X-ray 3D imaging according to claim 1, characterized in that: A square groove is provided on one side of the inner air pipe (10), and an airway cover (12) is provided at the notch of the square groove to form a passage for transmitting gas.

7. The high temperature device for in-situ stretching based on X-ray 3D imaging according to claim 1, characterized in that: Sealing heat-insulating materials are coated on the interfaces between the heat-insulating outer shell (14) and the external air duct (13), and between the external air duct (13) and the internal air duct (10).

8. The high temperature device for in-situ stretching based on X-ray 3D imaging according to claim 1, characterized in that: The outer periphery of the upper clamp (1) is provided with an annular portion, the upper end of the light-transmitting tube (2) cooperates with the annular portion of the upper clamp (1), and the lower end of the light-transmitting tube (2) cooperates with the upper annular portion of the square support tube (3).

9. The high temperature device for in-situ stretching based on X-ray 3D imaging according to claim 1, characterized in that: A thermocouple (17) is provided in the stretching mechanism, and the thermocouple (17) is arranged below the upper clamp (1).

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