In-situ thermogravimetry and corrosion thermal cycle testing device

Abstract

The invention discloses an in-situ thermogravimetric and corrosion thermal cycle testing device, which relates to the technical field of thermal cycle testing devices, and comprises a base, a reaction tube, a placement table and a heating movable furnace, the reaction tube is horizontally arranged, and the axial direction of the reaction tube is parallel to the length extension direction of the base; the object placing table is positioned in the reaction tube and is used for fixing a sample to be tested. The heating movable furnace is arranged on the base in a sliding mode in the axial direction of the reaction tube, the heating movable furnace can enclose or be separated from the reaction tube when sliding in a reciprocating mode, the heating movable furnace is provided with a heating wire, and when the heating movable furnace enclose the reaction tube, the heating wire can heat a sample in the reaction tube. According to the invention, the reaction tube is horizontally arranged, and the heating movable furnace slides along the axial direction of the reaction tube to enclose or separate from the reaction tube, so that a test mode that a sample is static and a temperature field is movable is realized; the position of the sample is always fixed, the switching between the high-temperature heating area and the cooling area is completed only by sliding and heating the movable furnace, and the sample testing precision is high.

Description

Technical Field

[0001] This invention relates to the field of thermal cycling testing equipment, and specifically to an in-situ thermogravimetric and corrosion thermal cycling testing equipment. Background Technology

[0002] With the rapid development of high-end industrial fields such as aero-engines, gas turbines, nuclear power engineering, and petrochemicals, the demand for materials used in critical hot-end components under extreme operating conditions is increasing. These materials must withstand prolonged exposure to high-temperature oxidation and corrosive atmospheres, as well as the severe thermal shocks caused by frequent start-ups and shutdowns. During this process, the changes in material quality are the most direct and critical indicators for assessing corrosion kinetics, oxide film growth patterns, and coating peeling failure behavior. To accurately simulate actual service conditions and achieve real-time, continuous monitoring of material quality evolution during hot corrosion, the development of professional and reliable high-temperature corrosion performance testing equipment is crucial. This not only helps optimize the composition design of new materials and improve their high-temperature corrosion resistance but also provides important data support for life prediction and failure mechanism research.

[0003] Existing high-temperature corrosion and thermogravimetric testing equipment still has some shortcomings in use. For example, the sample needs to move a long distance through a suspension line or flexible connector during the test. When repeatedly entering and leaving the reaction zone, it is easily affected by mechanical vibration, airflow disturbance and thermal stress coupling, resulting in significant fluctuations in the weighing signal and making it difficult to obtain stable, continuous and high-precision mass change data. Summary of the Invention

[0004] The purpose of this invention is to overcome the above-mentioned technical deficiencies and propose an in-situ thermogravimetric and corrosion thermal cycling testing device. This device solves the technical problem that existing high-temperature corrosion and thermogravimetric testing equipment requires long-distance movement of samples through suspension wires or flexible connectors during the testing process, resulting in significant fluctuations in the weighing signal and making it difficult to obtain stable, continuous, and high-precision mass change data.

[0005] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution: This invention provides an in-situ thermogravimetric and corrosion thermal cycling testing device, comprising: Base; The reaction tube is horizontally positioned with its axis parallel to the length direction of the base. A stage, located inside the reaction tube, is used to fix the sample to be tested; and A heating furnace is slidably disposed on the base along the axial direction of the reaction tube. The heating furnace can enclose or detach from the reaction tube when it reciprocates. The heating furnace has a heating wire. When the heating furnace encloses the reaction tube, the heating wire can heat the sample inside the reaction tube.

[0006] In some embodiments, the heating furnace includes a furnace body, a heating wire, and a heat insulation layer, wherein the heating wire is disposed on the inner wall of the furnace body, and the heat insulation layer is disposed on the outer wall of the furnace body.

[0007] In some embodiments, the furnace body is arched, and the base is provided with slide rails along its length, with the bottom sides of the furnace body slidably connected to the slide rails.

[0008] In some embodiments, the central axis of the furnace body coincides with the central axis of the reaction tube.

[0009] In some embodiments, the system further includes a guide rail motor and a rack, one end of which is connected to the furnace body, and the other end of which meshes with the output shaft of the guide rail motor. When the guide rail motor drives its output shaft to rotate, it can drive the rack to reciprocate through the meshing action, so that the rack drives the furnace body to slide back and forth.

[0010] In some embodiments, a sample weighing support assembly is further included. The sample weighing support assembly includes a weighing sensor, a cantilever beam structure, and a sample fixing clamp. The weighing sensor is located in the room temperature region at one end of the reaction tube. One end of the cantilever beam is mechanically connected to the weighing sensor. The other end of the cantilever beam extends into the interior of the reaction tube along the axial direction and is connected to the sample fixing clamp. The sample fixing clamp is used to fix the sample to be tested and keep the sample in a constant spatial position throughout the test.

[0011] In some embodiments, the end of the reaction tube near the weighing sensor has a water-cooled insulation layer.

[0012] In some embodiments, a gas supply protection unit is further included, which includes a gas inlet pipe and an isolation gas path. The gas inlet pipe is used to introduce simulated air or corrosive gas into the reaction tube, and the isolation gas path is located in the connection area between the weighing sensor and the reaction tube to prevent corrosive gas from diffusing into the weighing area.

[0013] In some embodiments, a control unit is also included, the control unit including a main controller and a temperature sensor, the main controller being connected to the temperature sensor and the heating wire, the temperature sensor being disposed inside the reaction tube.

[0014] In some embodiments, an inert gas tube is further included, the output end of which is connected to the inlet of the reaction tube, and the inert gas tube has a switching valve connected to the main controller.

[0015] Compared with existing technologies, the in-situ thermogravimetric and corrosion thermal cycling testing device provided by this invention achieves a testing mode where the sample is stationary and the temperature field moves by setting the reaction tube horizontally and allowing the heating furnace to slide along the axial direction of the reaction tube to surround or detach from the reaction tube. The sample is always fixed on the platform to maintain a constant spatial position, and the rapid switching between the high-temperature heating zone and the cooling zone is completed only by the reciprocating sliding of the heating furnace. This avoids the mechanical vibration, airflow disturbance, and thermal stress coupling problems caused by the long-distance reciprocating movement of the sample through suspension wires or flexible connectors in traditional technologies. It significantly reduces the fluctuation of the weighing signal and obtains stable, continuous, and high-precision mass change data, solving the problem of insufficient testing accuracy caused by repeated sample movement in existing technologies. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the testing device provided in an embodiment of the present invention; Figure 2 This is a right-side view of the testing device provided in an embodiment of the present invention; Figure 3 This is a thermogravimetric data graph of a test sample oxidized at 900 °C for two hours, provided in an embodiment of the present invention. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0018] To address the technical problem that existing high-temperature corrosion and thermogravimetric testing equipment requires long-distance movement of samples via suspension wires or flexible connectors during testing, resulting in significant fluctuations in weighing signals and difficulty in obtaining stable, continuous, and high-precision mass change data, this invention provides an in-situ thermogravimetric and corrosion thermal cycling testing device. This device enables a testing mode where the sample remains stationary while the temperature field moves, avoiding the mechanical vibration, airflow disturbance, and thermal stress coupling problems caused by the long-distance reciprocating movement of samples via suspension wires or flexible connectors in traditional technologies.

[0019] It should be noted that the in-situ thermogravimetric and corrosion thermal cycling testing device described in this invention is used for, but not limited to, sample performance testing. For ease of explanation, this invention will only use the application of the in-situ thermogravimetric and corrosion thermal cycling testing device to sample performance testing as an example. The principle of the in-situ thermogravimetric and corrosion thermal cycling testing device in other types of equipment is essentially the same as that in sample performance testing, and will not be elaborated here.

[0020] Please see Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the in-situ thermogravimetric and corrosion thermal cycling testing device according to an embodiment of the present invention. The in-situ thermogravimetric and corrosion thermal cycling testing device includes a base 1, a reaction tube 2, a stage 3, and a movable heating furnace 4. The reaction tube 2 is horizontally arranged, with its axial direction parallel to the length extension direction of the base 1. The stage 3 is located inside the reaction tube 2 and is used to fix the sample to be tested. The movable heating furnace 4 is slidably disposed on the base 1 along the axial direction of the reaction tube 2. The movable heating furnace 4 can surround or detach from the reaction tube 2 when it reciprocates. The movable heating furnace 4 has a heating wire 41. When the movable heating furnace 4 surrounds the reaction tube 2, the heating wire 41 can heat the sample inside the reaction tube 2. In this embodiment, the base 1 is made of rigid metal material, providing stable mechanical support for the entire device and a basis for the linear motion of the heating unit. The reaction tube 2 is made of high-purity alumina corundum tube or high-temperature resistant alloy tube, capable of withstanding high temperatures and corrosive gases. Sealing flanges are installed at both ends of the reaction tube 2 for connection to the gas supply system and exhaust system, forming a unidirectional gas flow channel along the axial direction of the reaction tube 2. The stage 3 is fixed to a specific position within the reaction tube 2 by a support structure to support the sample to be tested, ensuring the sample remains in a fixed spatial position throughout the test. The movable heating furnace 4 is slidably mounted on the base 1 and can switch between a heating position (furnace covering the sample area) and a non-heating position (furnace moving away from the sample area) as it slides back and forth on the base 1. This allows for rapid changes in the temperature field of the sample area without altering its spatial position. The "temperature zone moves, sample remains stationary" approach effectively avoids the mechanical disturbance caused by the sample's reciprocating motion from affecting the weighing data.

[0021] In one embodiment, please refer to Figure 1 The heating furnace 4 includes a furnace body 42, a heating wire 41, and a heat insulation layer 43. The heating wire 41 is disposed on the inner wall of the furnace body 42, and the heat insulation layer 43 is disposed on the outer wall of the furnace body 42. In this embodiment, the heating wire 41, as a heating element, is distributed axially along the reaction tube 2 to form a stable and controllable high-temperature zone within the reaction tube 2. The heating wire 41 can be a resistance heating element. The heat insulation layer 43 is preferably made of high-temperature resistant fiber material. The heat insulation layer 43 is used to reduce excessive heat loss from the furnace body, thereby reducing the temperature rise on the outer surface of the furnace body and improving energy efficiency.

[0022] In one embodiment, please refer to Figure 1 The furnace body 42 is roughly arched, and a slide rail 11 is arranged along the length of the base 1. The bottom sides of the furnace body 42 are slidably connected to the slide rail 11. In this embodiment, the slide rail 11 is fixed to the base 1, providing linear guidance for the heating movable furnace 4, so that the heating movable furnace 4 can slide smoothly along the axial direction of the reaction tube 2, and achieve precise displacement control of the temperature zone.

[0023] In one embodiment, please refer to Figure 1 The central axis of the furnace body 42 coincides with the central axis of the reaction tube 2. In this embodiment, this arrangement ensures that when the heating furnace 4 surrounds the reaction tube 2, the sample is located in the center of the heating area, guaranteeing heating uniformity and temperature control accuracy.

[0024] In one embodiment, please refer to Figure 1 The system also includes a guide rail motor 5 and a rack (not shown in the figure). One end of the rack is connected to the furnace body 42, and the other end meshes with the output shaft of the guide rail motor 5. When the guide rail motor 5 drives its output shaft to rotate, it can drive the rack to reciprocate through the meshing action, so that the rack drives the furnace body 42 to slide back and forth. In this embodiment, the guide rail motor 5 is a stepper motor or a servo motor, and drives the rack to reciprocate through its output shaft, thereby driving the furnace body 42 to slide back and forth, realizing the switching of the furnace body 42 between the heating zone and the non-heating zone. A position sensor or encoder can be installed on the trajectory of the furnace body 42, and the displacement position of the furnace body can be fed back by the position sensor or encoder. In addition, the guide rail motor 5 can be electrically connected to the control system, and the control system can set the moving speed, dwell position and heating power of the heating zone to realize various test modes such as constant temperature corrosion, cyclic corrosion and thermal shock.

[0025] In one embodiment, please refer to Figure 1The testing apparatus also includes a sample weighing support assembly 7, which comprises a weighing sensor 71, a cantilever beam 72, and a sample fixing clamp 73. The weighing sensor 71 is located in the room temperature region at one end of the reaction tube 2. One end of the cantilever beam 72 is mechanically connected to the weighing sensor 71, and the other end of the cantilever beam 72 extends into the interior of the reaction tube 2 along its axial direction and is connected to the sample fixing clamp 73. The sample fixing clamp 73 is used to fix the sample to be tested and keep the sample in a constant spatial position throughout the test. In this embodiment, the weighing sensor 71 is fixedly installed in the room temperature region at one end of the reaction tube 2 and is a strain gauge or force balance high-precision sensor. The weighing sensor 71 is equipped with a strain-sensitive element. When the load transmitted by the cantilever beam 72 changes, the strain element generates a corresponding resistance change, which is converted into a voltage or current signal proportional to the load through a Wheatstone bridge or equivalent circuit, thereby realizing in-situ real-time measurement of the sample mass. The cantilever beam 72 is made of high-rigidity alloy material, possessing high vibration resistance and structural stability, effectively suppressing weighing signal noise caused by airflow fluctuations, furnace movement, and external disturbances. The sample fixing clamp 73 is located inside the reaction tube 2 to fix the sample to be tested. The clamp material is selected for its high temperature and corrosion resistance to ensure structural stability under long-term high-temperature gas conditions. The sample is suspended from the free end of the cantilever beam 72 by the sample fixing clamp 73. The weight of the sample acts as a concentrated load on the end of the cantilever beam 72, causing a slight deflection change within its elastic range. This bending force or axial force is transmitted to the weighing sensor 71, which converts the mechanical load into an electrical signal output. This rigid cantilever beam weighing method maintains a relatively stationary state with the sample throughout the test, avoiding additional disturbances to the weighing results caused by the sample's reciprocating motion, and improving the reliability of the weighing data under long-term high-temperature corrosion testing conditions. The electrical signal is amplified, filtered, and converted from analog to digital before being input into the data acquisition system. The data acquisition system processes the acquired signal in real time and converts it into a sample mass change value, thereby realizing continuous and dynamic monitoring of sample mass during high-temperature corrosion.

[0026] In one embodiment, please refer to Figure 1 The end of the reaction tube 2 near the weighing sensor 71 has a water-cooled heat insulation layer 74. In this embodiment, the water-cooled heat insulation layer 74 is disposed in the region of the reaction tube 2 near the weighing end. The water-cooled heat insulation layer 74 is used to reduce the transfer of heat from the high-temperature area to the weighing sensor 71 along the cantilever beam 72, thereby reducing the influence of zero-point drift and temperature disturbance on the mass signal and ensuring that the weighing sensor 71 always operates under stable environmental conditions, thus avoiding the influence of high temperature, corrosive gases and thermal radiation on the weighing accuracy.

[0027] A heat insulation layer 75 is provided at the end of the reaction tube 2 furthest from the weighing sensor 71. The heat insulation layer 75 has a through-hole vent 751 to form a channel for gas to flow axially within the reaction tube 4. During the test, an external gas source is connected to the gas inlet pipe 81 through the reaction tube 2, and the inlet flow rate is set and stably controlled by the corresponding gas flow controller 21. After the gas flows through the sample area, it is discharged from the vent 11.

[0028] In one embodiment, please refer to Figure 1 The testing device also includes a gas supply protection unit 8, which includes a gas inlet pipe 81 and an isolation gas path 82. The gas inlet pipe 81 is used to introduce simulated air or corrosive gas into the reaction tube 2. The isolation gas path 82 is located at the connection area between the load cell 71 and the reaction tube 2 to prevent corrosive gas from diffusing into the weighing area. In this embodiment, the gas inlet pipe 81 is connected to an external gas source and is equipped with a flow controller to precisely adjust the inlet flow rate. The corrosive gas enters the reaction tube 2 after being precisely adjusted by the flow controller, realizing high-temperature corrosion testing under different gas conditions. The isolation gas path 82 is set at the sealed interface where the cantilever beam 72 passes through the reaction tube 2, and is used to introduce inert protective gas to form an air curtain barrier, preventing corrosive gas from diffusing into the weighing area and extending the service life of the weighing system. High-temperature resistant sealing components, including sealing rings and compression structures, are installed at the sealing flanges at both ends of the reaction tube 2 to ensure the airtightness of the reaction tube 2 under high temperature and dynamic gas conditions.

[0029] In one embodiment, please refer to Figure 1 The testing apparatus also includes a control unit 9, which comprises a main controller 91 and a temperature sensor 92. The main controller 91 is connected to the temperature sensor 92 and the heating wire 41. The temperature sensor 92 is located inside the reaction tube 2. In this embodiment, the temperature sensor 92 is a thermocouple, arranged inside the reaction tube 2 near the sample, to monitor the actual temperature change near the sample in real time. The temperature signal is input to the main controller 91, forming a closed-loop control system with the heating wire 41, enabling precise adjustment of heating power and temperature zone position, ensuring the stability of the test conditions. The main controller 91 is also connected to the guide rail motor 5 and the weighing sensor 71, providing unified control and real-time acquisition of data on the sliding position of the heating unit, furnace temperature changes, gas flow rate, and sample mass. It can automatically complete the isothermal corrosion, cyclic oxidation, and thermal shock test processes according to a preset program, and simultaneously record complete data on sample mass changes over time. The data acquisition system is synchronously triggered with the temperature control and gas control modules to ensure the time consistency between mass changes, temperature changes, and gas parameters.

[0030] In one embodiment, the testing apparatus further includes an inert gas tube, the output of which is connected to the inlet of the reaction tube 2. The inert gas tube has a switching valve connected to the main controller 91. In this embodiment, the inert gas tube is used to introduce inert gas (such as nitrogen) into the reaction tube 2 for rapid cooling or gas replacement during the cooling phase after the test or in an emergency. The main controller 91 controls the opening and closing of the switching valve to achieve automated operation.

[0031] To better understand this invention, the following is combined with... Figures 1 to 3 The technical solution of the present invention will be described in detail below: During isothermal thermogravimetric analysis (TGA), the sample is fixed in the sample fixture 73, with the sample located at the free end of the cantilever beam 72. The sample load is transferred to the load cell 71 via the cantilever beam 72. The load cell 71 performs zero-point calibration and determines stability. A set reaction gas is introduced into the reaction tube 2 through the gas inlet pipe 81, with the flow rate precisely controlled by a flow controller. Simultaneously, an inert protective gas is introduced through the isolation gas path 82 to prevent corrosive gases from damaging the load cell 71. The main controller 91 controls the guide rail motor 5 to move the heating furnace 4 to the heating position and cover the sample area, energizing the heating wire 41 to heat the sample to the set temperature and maintain it at a constant temperature. Thermocouples monitor the temperature near the sample in real time and work with the main controller 91 to achieve closed-loop temperature control. Under constant temperature and set gas conditions, the sample undergoes oxidation or corrosion reactions. The mass change of the sample is continuously collected by the load cell 71, processed, and transmitted to the main controller 91 to form a mass-time curve, thus realizing the isothermal thermogravimetric analysis. After the test, the main controller 91 shuts off the power supply to the heating wire 41, opens the switch valve of the inert gas tube to introduce inert gas for cooling, and closes the gas circuit after the temperature of the reaction tube 2 and the sample drops to a safe range, stops data acquisition and removes the sample, thus completing one isothermal thermogravimetric test.

[0032] During cyclic oxidation or thermal shock thermogravimetric analysis (TGA), the sample fixation, gas control, and weighing system startup are the same as in constant temperature TGA. The main controller 91 controls the guide rail motor 5 to drive the movable heating furnace 4 to reciprocate between the heating and non-heating positions according to a preset program: in the heating position, the movable heating furnace 4 covers the sample area, and the heating wire 41 is energized to raise the sample temperature to the set high temperature and maintain it for a certain period; in the non-heating position, the movable heating furnace 4 moves away from the sample area, exposing the sample to a lower temperature environment for rapid cooling. The above heating-holding—furnace-cooling—cooling-holding—furnace-reheating process is automatically executed according to a preset number of cycles. Throughout the reciprocating heating process, the sample remains stationary, and the weighing sensor 71 continuously outputs a mass signal, avoiding the swaying and disturbance errors introduced by traditional sample-moving schemes. Simultaneously, the water-cooled insulation layer 74 continuously weakens the thermal impact of high temperature on the weighing end, ensuring the continuity and stability of the weighing data during the cycle. Temperature sensor 92 synchronously records temperature changes, forming temperature-time-mass correlation data, which is used to analyze the dynamic behavior and failure characteristics of materials during cyclic oxidation and thermal shock processes. After the cycle is completed, the main controller 91 stops the guide rail motor 5 and stops the heating furnace 4 in a safe position, turns off the power supply to the heating wire 41, and removes the sample after the inert gas has cooled to a safe temperature, completing one cycle of oxidation / thermal shock thermogravimetric test.

[0033] This invention achieves a testing mode where the sample is stationary while the temperature field moves by employing a horizontal reaction channel and a sliding temperature zone switching structure. While ensuring the sample remains in a stable weighing state, the reciprocating sliding of the heating furnace body on a horizontal guide rail enables rapid switching between the high-temperature heating and cooling zones, thus accurately simulating isothermal oxidation, cyclic oxidation, and thermal shock conditions. Simultaneously, the introduction of a side-mounted rigid cantilever beam weighing structure, combined with water-cooled insulation, effectively reduces the influence of high-temperature radiation, airflow disturbance, and mechanical vibration on the weighing system, significantly improving the stability and measurement accuracy of in-situ thermogravimetric testing.

[0034] This invention enables high-frequency thermal cycling testing and high-precision in-situ mass change monitoring under complex gas conditions within a compact desktop space. It balances the size, accuracy, and functional integration of the testing device, providing a stable, efficient, and environmentally adaptable testing method for studying the high-temperature corrosion kinetics and failure behavior of materials. This invention supports coordinated control of the heating process, temperature field switching, gas supply, and weighing data acquisition, reducing frequent manual intervention and interruptions, minimizing data dispersion caused by human error, and improving testing efficiency and data consistency. It is suitable for long-cycle corrosion kinetic experiments and standardized comparative tests.

[0035] The specific embodiments of the present invention described above do not constitute a limitation on the scope of protection of the present invention. Any other corresponding changes and modifications made in accordance with the technical concept of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. An in-situ thermogravimetric and corrosion thermal cycling testing device, characterized in that, include: Base; The reaction tube is horizontally positioned with its axis parallel to the length direction of the base. A stage, located inside the reaction tube, is used to fix the sample to be tested; and A heating furnace is slidably disposed on the base along the axial direction of the reaction tube. The heating furnace can enclose or detach from the reaction tube when it reciprocates. The heating furnace has a heating wire. When the heating furnace encloses the reaction tube, the heating wire can heat the sample inside the reaction tube.

2. The in-situ thermogravimetric and corrosion thermal cycling testing device according to claim 1, characterized in that, The heating furnace includes a furnace body, a heating wire, and a heat insulation layer. The heating wire is disposed on the inner wall of the furnace body, and the heat insulation layer is disposed on the outer wall of the furnace body.

3. The in-situ thermogravimetric and corrosion thermal cycling testing device according to claim 2, characterized in that, The furnace body is arched, and the base is provided with slide rails along its length. The bottom sides of the furnace body are slidably connected to the slide rails.

4. The in-situ thermogravimetric and corrosion thermal cycling testing device according to claim 3, characterized in that, The central axis of the furnace body coincides with the central axis of the reaction tube.

5. The in-situ thermogravimetric and corrosion thermal cycling testing apparatus according to claim 1, characterized in that, It also includes a guide rail motor and a rack. One end of the rack is connected to the furnace body, and the other end of the rack meshes with the output shaft of the guide rail motor. When the guide rail motor drives its output shaft to rotate, it can drive the rack to reciprocate through the meshing action, so that the rack drives the furnace body to slide back and forth.

6. The in-situ thermogravimetric and corrosion thermal cycling testing apparatus according to claim 1, characterized in that, It also includes a sample weighing support assembly, which includes a weighing sensor, a cantilever beam structure, and a sample fixing clamp. The weighing sensor is located in the room temperature region at one end of the reaction tube. One end of the cantilever beam is mechanically connected to the weighing sensor, and the other end of the cantilever beam extends into the interior of the reaction tube along the axial direction and is connected to the sample fixing clamp. The sample fixing clamp is used to fix the sample to be tested and keep the sample in a constant spatial position throughout the test.

7. The in-situ thermogravimetric and corrosion thermal cycling testing apparatus according to claim 6, characterized in that, The end of the reaction tube near the weighing sensor has a water-cooled heat insulation layer.

8. The in-situ thermogravimetric and corrosion thermal cycling testing apparatus according to claim 6, characterized in that, It also includes a gas supply protection unit, which includes a gas inlet pipe and an isolation gas path. The gas inlet pipe is used to introduce simulated air or corrosive gas into the reaction tube, and the isolation gas path is located in the connection area between the weighing sensor and the reaction tube to prevent corrosive gas from spreading to the weighing area.

9. The in-situ thermogravimetric and corrosion thermal cycling testing apparatus according to claim 1, characterized in that, It also includes a control unit, which includes a main controller and a temperature sensor. The main controller is connected to the temperature sensor and the heating wire. The temperature sensor is located inside the reaction tube.

10. The in-situ thermogravimetric and corrosion thermal cycling testing apparatus according to claim 9, characterized in that, It also includes an inert gas tube, the output end of which is connected to the inlet of the reaction tube, and the inert gas tube has a switching valve connected to the main controller.

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