A testing device for high temperature bending creep properties of ceramic materials

Abstract

The utility model relates to a kind of testing device of ceramic material high-temperature bending creep performance, comprising: heating unit, temperature control unit, high-temperature load loading system, deformation detection system, span adjustment mechanism and inert gas protection system.The beneficial effects of the utility model are: using three-point bending loading structure (high-temperature-resistant ceramic support, load pressure head and lower support roller combination) accurately reproduces the bending stress field in actual engineering;Integrated non-contact deformation detection system (laser displacement sensor, thermocouple and infrared thermometer) realizes high-precision real-time monitoring of deflection and temperature under high-temperature environment;Through adjustable span mechanism, different size block body ceramic sample is adapted;Inert gas protection system is introduced to prevent sample oxidation;And relying on servo control system, dynamic loading and data automatic acquisition are realized, thereby significantly improving test accuracy, efficiency and engineering applicability, providing reliable support for high-temperature structural ceramic research and development, screening and life evaluation.

Description

Technical Field

[0001] This utility model belongs to the field of high-temperature mechanical property testing technology for ceramic materials, and in particular relates to a testing device for the high-temperature bending creep performance of ceramic materials. Background Technology

[0002] Ceramic materials, as core foundational materials in high-temperature engineering (such as high-temperature kiln furniture, engine hot-end components, and firing plates), directly determine the service life and reliability of components under constant high-temperature stress due to their resistance to flexural creep. Flexural creep, as one of the main forms of high-temperature failure in ceramic materials, manifests as irreversible plastic deformation over time under sustained flexural stress. Its quantitative characterization is crucial for material selection, process optimization, and engineering applications. However, existing testing devices for high-temperature flexural creep of ceramic materials still suffer from significant structural defects, severely limiting testing accuracy and engineering applicability, as detailed below:

[0003] I. Distortion in the simulation of operating conditions of existing testing standards and equipment

[0004] Internationally accepted standards for evaluating high-temperature creep in ceramic materials (such as ISO 3187:1989) employ a uniaxial compression creep test method, and the corresponding testing apparatus can only apply compressive stress in the vertical direction to the specimen. This structural design completely ignores the bending stress state commonly experienced by ceramic components (such as kiln beams and firing plates) in actual engineering, resulting in a serious disconnect between test data and failure behavior under actual service conditions. For example, the standard apparatus requires a custom-made cylindrical specimen with a central through hole (diameter 50±0.5 mm, height 50±0.5 mm, through hole diameter 12-13 mm). This structure is only suitable for compressive loading and cannot simulate the three-point bending stress mode of beam-type components, making it difficult to reflect the stress distribution characteristics under real working conditions.

[0005] II. Limitations of Existing Device Loading Modes and Measurement Methods

[0006] In existing technologies, creep testing devices for both metallic and ceramic matrix composite materials (such as CN202211621668.9 and CN202411464918.1) all employ uniaxial tensile / compression loading structures, lacking the ability to simulate bending stress fields under actual working conditions. Furthermore, traditional devices generally rely on static loading mechanisms (such as the weight assembly in CN201922417802.3 and the counterweight system in CN202410875067.3), failing to achieve dynamic loading at multiple stress levels. At the measurement end, existing technologies mostly employ contact sensors (such as the grating ruler in CN202211621668.9), whose measurement ends are susceptible to interference from high-temperature environments (such as thermal expansion and oxidation), and cannot achieve non-contact real-time monitoring, resulting in low accuracy of deformation data acquisition and susceptibility to human error.

[0007] III. Existing equipment is not sufficiently adaptable to the testing of bulk ceramics.

[0008] For testing bulk ceramic materials (especially large-sized samples), existing technical devices have significant structural defects: on the one hand, their sample clamping structures (such as the chuck in CN201922417802.3) are only suitable for small-sized fibrous or thin sheet samples and cannot stably fix bulk ceramics; on the other hand, the span adjustment function is missing, making it difficult to adjust the support spacing according to the sample length, resulting in test results that are significantly affected by the sample geometry and lack universality.

[0009] IV. Existing devices have weak protection and data correlation.

[0010] In high-temperature environments, sample oxidation is a key factor affecting test results. However, existing technology devices generally do not have an inert gas protection structure (such as the open furnace cavity in CN202411464918.1), which cannot suppress sample surface oxidation and leads to distortion of creep data.

[0011] In summary, existing testing devices for high-temperature bending creep of ceramic materials suffer from structural defects such as distorted simulation of working conditions, limited loading modes, low measurement accuracy, poor sample adaptability, lack of protective functions, and weak data correlation. There is an urgent need for a new testing device that can reproduce real bending stress, support dynamic loading and non-contact measurement, be compatible with bulk ceramics, and have oxidation protection functions, so as to improve the accuracy and engineering practicality of high-temperature mechanical property evaluation of ceramic materials. Utility Model Content

[0012] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a testing device for the high-temperature bending creep properties of ceramic materials.

[0013] This testing device for the high-temperature bending creep properties of ceramic materials includes: a high-temperature load loading system for applying a preset load to the test sample, a deformation detection system for detecting the temperature, deformation and deflection data of the test sample, a span adjustment mechanism, an inert gas protection system for preventing oxidation of the test sample, and a servo control system for controlling the testing device.

[0014] The high-temperature load loading system includes a lower support roller, a high-temperature resistant ceramic support, and a load head; the high-temperature resistant ceramic support is fixed on the lower support roller and is used to place the test sample; the load head is located directly above the test sample and is used to apply a preset load to the test sample.

[0015] The deformation detection system includes a laser displacement sensor, a thermocouple, an infrared thermometer, and a data acquisition module;

[0016] The span adjustment mechanism is used to preset and adjust the span between the lower support rollers according to the length of the test sample to accommodate test samples of different sizes.

[0017] An inert gas protection system is used to introduce inert gas into the high-temperature furnace cavity during the test and to circulate the gas flow within the high-temperature furnace cavity to prevent oxidation of the test sample.

[0018] The servo control system is electrically connected to the load head, data acquisition module, and span adjustment mechanism.

[0019] As a preferred option:

[0020] This device is used to test the bending creep properties of test samples in a relatively enclosed high-temperature environment consisting of a high-temperature furnace cavity and a high-temperature furnace lid. The relatively enclosed high-temperature environment is equipped with a heating unit and a temperature control unit, which can raise the internal temperature according to a predetermined heating curve and control the temperature (accurately raising the internal temperature to 1600℃ at a rate of 5℃ / min and maintaining a stable temperature for 2 hours, providing a stable high-temperature environment that meets the test requirements for the heating process of the test sample, so as to simulate its high-temperature working conditions in actual application scenarios); the servo control system is electrically connected to the heating unit and the temperature control unit.

[0021] The lower support rollers are either symmetrically arranged double rollers or equidistantly arranged three rollers;

[0022] The high-temperature resistant ceramic support has a groove on the upper part, and the test sample is fixed to the high-temperature resistant ceramic support by the groove; the surface of the high-temperature resistant ceramic support is coated with a high-temperature resistant ceramic coating to prevent the high-temperature resistant ceramic support and the test sample from sticking together at high temperatures;

[0023] The load head is made of ceramic.

[0024] Preferably, the test sample is a ceramic strip to be subjected to creep.

[0025] As a preferred option:

[0026] Thermocouples, laser displacement sensors, and infrared thermometers are connected to the data acquisition module via signal transmission components; the measurement axis of the laser displacement sensor coincides with the center vertical line of the test sample, and the laser displacement sensor is used for non-contact detection of the deflection data of the test sample; the thermocouples and infrared thermometers are used to jointly test the temperature data of the test sample; the data acquisition module is used to collect and store temperature, deformation, and deflection data and generate real-time curves based on the data;

[0027] The laser displacement sensor is fixed at the center of the top of the high-temperature furnace cavity;

[0028] The signal transmission component is an optical fiber;

[0029] Thermocouples are embedded on both sides of the sample to be tested inside the high-temperature furnace cavity;

[0030] The infrared thermometer is fixed inside the high-temperature furnace cavity and aimed at the sample to be tested.

[0031] As a preferred embodiment, the span adjustment mechanism includes multiple sets of positioning holes and slots located on the inner wall of the high-temperature furnace cavity and distributed on both sides of the test sample. The positioning holes and slots are used to install and fix the lower support roller, and the surface of the positioning holes and slots is coated with a high-temperature resistant ceramic coating.

[0032] As a preferred embodiment, the inert gas protection system includes a gas cylinder storing inert gas and an inert gas cylinder flow meter installed on the gas cylinder. The high-temperature furnace cavity is provided with an inert gas inlet, which is connected to the gas cylinder outlet and the high-temperature furnace cavity. The high-temperature furnace cavity is also provided with an exhaust port. The inert gas cylinder flow meter is electrically connected to a servo control system.

[0033] As a preferred option:

[0034] The inert gas inlet consists of multiple annularly distributed inlet holes located at the bottom of the high-temperature furnace cavity, and the top of the high-temperature furnace cavity is also equipped with an exhaust port that forms an airflow circulation with the inert gas inlet.

[0035] The inert gas introduced into the high-temperature furnace cavity is nitrogen or argon.

[0036] As a preferred option:

[0037] The testing device also includes: a lower mold base pad, a lower mold base, an ejector rod, a guide post, a guide sleeve, a high-temperature furnace pad, a limit block, a high-temperature furnace cover fixing plate, a high-temperature furnace cover fixing plate pad, and an upper mold base;

[0038] The high-temperature furnace cavity and high-temperature furnace cover are mechanically fixed between the upper mold base and the lower mold base. The upper mold base and the lower mold base provide stable and reliable fixed support for the high-temperature furnace cavity and high-temperature furnace cover, ensuring that the high-temperature furnace cavity and high-temperature furnace cover maintain their predetermined position and posture throughout the entire test, avoiding displacement or shaking due to external factors, thereby ensuring the stability of the test environment. A lower mold base pad is also fixedly connected to the bottom of the lower mold base, and a high-temperature furnace cover fixing plate pad is also fixedly connected to the bottom of the upper mold base. A high-temperature furnace cover fixing plate is also fixedly connected to the bottom of the high-temperature furnace cover fixing plate pad, and a limiting block is fixedly connected to the high-temperature furnace cover. A high-temperature furnace pad is also fixedly connected to the top of the lower mold base. The high-temperature furnace cover fixing plate pad, the high-temperature furnace cover fixing plate, the limiting block, the high-temperature furnace pad, the lower mold base, and the lower mold base pad are all used to place the high-temperature furnace cavity and high-temperature furnace cover, and to support the force generated when the load head is pressurized. The pad and lower mold base pad provide a flat and solid bearing surface for the high-temperature furnace cavity and high-temperature furnace cover, evenly distributing their own weight and various additional forces generated during subsequent tests. On the other hand, when the load head applies pressure, the pads, thanks to their material properties and structural design, effectively support and transmit the force applied by the load head, ensuring that the force acts evenly and stably on the test object, avoiding test errors caused by uneven local stress. The high-temperature furnace cover fixing plate is securely connected to the high-temperature furnace cover fixing plate pad and the limiting block through connectors such as hexagonal screws, firmly fixing the high-temperature furnace cover to prevent displacement of the high-temperature furnace cover under unexpected circumstances. The limiting block is used to precisely control the movement range of the high-temperature furnace cover in a specific direction according to the pre-set movement range and position accuracy requirements, ensuring the positional accuracy of the high-temperature furnace cover during opening, closing, and testing, and ensuring the sealing and safety of the entire testing device.

[0039] One end of the push rod passes through the high-temperature furnace pad and extends into the high-temperature furnace chamber, while the other end is connected to an external drive device. After the test is completed, the push rod moves in a straight line under the drive of the external drive device to push the test sample out of the high-temperature ceramic support (ensuring that the sample can be easily removed after the test for subsequent analysis and testing). A dynamic seal is provided between the push rod and the high-temperature furnace chamber to ensure that the airtightness of the high-temperature furnace chamber is not damaged when the push rod is pushed out / retracted; the external drive device is electrically connected to the servo control system.

[0040] Both sides of the upper and lower mold bases are provided with hollow guide sleeves, and guide posts are embedded in the guide sleeves. The guide posts serve as guiding devices to guide the high-temperature furnace cover to mate with the high-temperature furnace cavity.

[0041] Preferably, the testing device also includes a mold handle, which is connected to a load head for transmitting external pressure to the load head.

[0042] As a preferred option:

[0043] The high-temperature furnace cavity adopts a double-shell structure. The inner shell of the high-temperature furnace cavity is composed of corundum mullite fiber bricks, and the outer shell of the high-temperature furnace cavity is composed of silicon carbide coated steel plate.

[0044] The heating unit is a U-shaped silicon molybdenum rod.

[0045] The beneficial effects of this utility model are:

[0046] This invention specifically employs a three-point bending loading structure (a combination of a high-temperature resistant ceramic support, a load indenter, and a lower support roller) to accurately reproduce the bending stress field in actual engineering. It integrates a non-contact deformation detection system (laser displacement sensor, thermocouple, and infrared thermometer) to achieve high-precision real-time monitoring of deflection and temperature under high-temperature conditions. An adjustable span mechanism adapts to different sized bulk ceramic samples. An inert gas protection system is introduced to prevent sample oxidation. Furthermore, a servo control system enables dynamic loading and automatic data acquisition, significantly improving testing accuracy, efficiency, and engineering applicability. This provides reliable support for the research, screening, and life assessment of high-temperature structural ceramics.

[0047] This utility model provides a high-temperature bending creep performance testing device for ceramic materials. Through innovative structural design, it comprehensively solves the core problems in the existing technology, such as distortion of working condition simulation, low measurement accuracy, poor sample adaptability, lack of protection function and weak data correlation. Attached Figure Description

[0048] Figure 1 A cross-sectional schematic diagram of a temperature, load, and deflection monitoring device inside a high-temperature furnace cavity;

[0049] Figure 2 This is a cross-sectional schematic diagram of the testing device for the high-temperature bending creep performance of ceramic materials according to this utility model;

[0050] Figure 3 for Figure 2 A cross-sectional view of the AA plane;

[0051] Figure 4 This is the circuit schematic diagram of this utility model.

[0052] Explanation of reference numerals in the attached drawings: 1. High-temperature resistant ceramic support; 2. Load head; 3. Lower support roller; 4. Span adjustment mechanism; 5. Thermocouple; 6. Laser displacement sensor; 7. Infrared thermometer; 8. Data acquisition module; 9. High-temperature furnace cavity; 10. Inert gas inlet; 11. Upper mold base; 12. Lower mold base; 13. Guide post; 14. Guide sleeve; 15. Mold handle; 16. High-temperature furnace cover; 17. Ejector rod; 18. Lower mold base pad; 19. High-temperature furnace pad; 20. Limiting block; 21. High-temperature furnace cover fixing plate; 22. High-temperature furnace cover fixing plate pad. Detailed Implementation

[0053] The present invention will be further described below with reference to embodiments. The description of the embodiments below is only for the purpose of helping to understand the present invention. It should be noted that for those skilled in the art, several modifications can be made to the present invention without departing from the principle of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

[0054] As one example, such as Figures 1 to 4 A testing device for the high-temperature flexural creep properties of ceramic materials is disclosed. This device is used to test the flexural creep properties of ceramic strips within a relatively enclosed high-temperature environment, consisting of a high-temperature furnace cavity 9 (inner layer: corundum-mullite fiber brick, outer layer: silicon carbide coated steel plate) and a high-temperature furnace cover 16, which employs a double-shell structure. The relatively enclosed high-temperature environment is equipped with a heating unit (U-shaped silicon molybdenum rod) and a temperature control unit, capable of raising and controlling the internal temperature according to a predetermined heating curve (precisely raising the internal temperature to 1600℃ at a rate of 5℃ / min). The temperature is maintained at a stable temperature for 2 hours to provide a stable high-temperature environment that meets the test requirements for the heating process of the ceramic strip to be creeped, so as to simulate its high-temperature working conditions in actual application scenarios. The test device includes: a high-temperature load loading system for applying a preset load to the ceramic strip to be creeped, a deformation detection system for detecting the temperature, deformation and deflection data of the ceramic strip to be creeped, a span adjustment mechanism 4, an inert gas protection system for preventing oxidation of the ceramic strip to be creeped, and a servo control system for controlling the test device.

[0055] The high-temperature load loading system includes a lower support roller 3 (a symmetrically arranged double roller), a high-temperature resistant ceramic support 1, and a ceramic load head 2. The high-temperature resistant ceramic support 1 is fixed on the lower support roller 3 and is used to hold the ceramic strip to be creeped. The upper part of the high-temperature resistant ceramic support 1 has a groove, and the ceramic strip to be creeped is fixed to the high-temperature resistant ceramic support 1 by the groove. The surface of the high-temperature resistant ceramic support 1 is coated with a high-temperature resistant ceramic coating to prevent the high-temperature resistant ceramic support and the ceramic strip to be creeped from sticking together at high temperatures. The load head 2 is located directly above the ceramic strip to be creeped and is used to apply a preset load to the ceramic strip to be creeped.

[0056] The deformation detection system includes a laser displacement sensor 6, a thermocouple 5, an infrared thermometer 7, and a data acquisition module 8. The thermocouple 5, laser displacement sensor 6, and infrared thermometer 7 are connected to the data acquisition module 8 via optical fiber. The laser displacement sensor 6 is fixed at the top center of the high-temperature furnace cavity 9, and its measurement axis coincides with the vertical line of the center of the ceramic strip to be creeped. The laser displacement sensor 6 is used for non-contact detection of the deflection data of the ceramic strip to be creeped. The thermocouple 5 is embedded on both sides of the test sample inside the high-temperature furnace cavity 9, and the infrared thermometer 7 is fixed inside the high-temperature furnace cavity 9 and aligned with the test sample. The thermocouple 5 and infrared thermometer 7 are used to collaboratively test the temperature data of the ceramic strip to be creeped. The data acquisition module 8 is used to collect and store temperature, deformation, and deflection data and generate real-time curves based on the data.

[0057] The span adjustment mechanism 4 is used to preset the span between the lower support rollers 3 according to the length of the ceramic strip to be creeped and adjust the span to adapt to ceramic strips of different sizes to be creeped; the span adjustment mechanism 4 includes multiple sets of positioning holes and slots located on the inner wall of the high temperature furnace cavity 9 and distributed on both sides of the test sample. The positioning holes and slots are used to install and fix the lower support rollers 3, and the surface of the positioning holes and slots is coated with a high temperature resistant ceramic coating.

[0058] An inert gas protection system is used to introduce inert gas (nitrogen) into the high-temperature furnace cavity 9 during the test and circulate the gas flow within the high-temperature furnace cavity 9 to prevent oxidation of the ceramic strip to be creeped. The inert gas protection system includes a gas cylinder storing inert gas and an inert gas cylinder flow meter installed on the gas cylinder. The high-temperature furnace cavity 9 is provided with an inert gas inlet 10 (which consists of multiple annularly distributed inlet holes located at the bottom of the high-temperature furnace cavity 9). The inert gas inlet 10 connects the outlet of the gas cylinder to the high-temperature furnace cavity 9. The top of the high-temperature furnace cavity 9 is also provided with an exhaust port that forms an airflow circulation with the inert gas inlet 10. The inert gas cylinder flow meter is electrically connected to a servo control system.

[0059] The servo control system is electrically connected to the load head 2, the data acquisition module 8, the heating unit, the temperature control unit, and the span adjustment mechanism 4.

[0060] The testing device also includes: a lower mold base plate 18, a lower mold base 12, an ejector rod 17, a guide post 13, a guide sleeve 14, a mold handle 15, a high-temperature furnace pad 19, a limiting block 20, a high-temperature furnace cover fixing plate 21, a high-temperature furnace cover fixing plate pad 22, and an upper mold base 11.

[0061] The high-temperature furnace cavity 9 and the high-temperature furnace cover 16 are mechanically connected between the upper mold base 11 and the lower mold base 12. The upper mold base and the lower mold base provide stable and reliable fixed support for the high-temperature furnace cavity and the high-temperature furnace cover, ensuring that the high-temperature furnace cavity and the high-temperature furnace cover maintain their predetermined positions and postures throughout the entire test, avoiding displacement or shaking due to external factors, thereby ensuring the stability of the test environment. The bottom of the lower mold base 12 is also fixedly connected to the lower mold base pad 18, and the bottom of the upper mold base 11 is also fixedly connected to the high-temperature furnace cover fixing plate pad 22. The bottom of the high-temperature furnace cover fixing plate pad 22 is also fixedly connected to the high-temperature furnace cover fixing plate 21, and the high-temperature furnace cover fixing plate 21 is fixedly connected to the limiting block 20, which is fixedly connected to the high-temperature furnace cover 16. The top of the lower mold base 12 is also fixedly connected to the high-temperature furnace pad 19. The high-temperature furnace cover fixing plate pad, the high-temperature furnace cover fixing plate, the limiting block, the high-temperature furnace pad, the lower mold base, and the lower mold base pad are all used to place the high-temperature furnace cavity and the high-temperature furnace cover, as well as to support the load head. The forces generated during pressurization: The high-temperature furnace cover fixing plate and the lower mold base plate provide a flat and solid bearing surface for the high-temperature furnace cavity and the high-temperature furnace cover, evenly distributing their own weight and various additional forces generated during subsequent tests. On the other hand, when the load head applies pressure, they can effectively support and transmit the force applied by the load head by virtue of their own material properties and structural design, ensuring that the force can act evenly and stably on the test object, avoiding test errors caused by uneven local force. The high-temperature furnace cover fixing plate is firmly connected to the high-temperature furnace cover fixing plate pad and the limiting block through connectors such as hexagonal screws, firmly fixing the high-temperature furnace cover to prevent the high-temperature furnace cover from shifting under unexpected circumstances. The limiting block is used to precisely control the movement range of the high-temperature furnace cover in a specific direction according to the pre-set movement range and position accuracy requirements, ensuring the position accuracy of the high-temperature furnace cover during opening, closing and testing, and ensuring the sealing and safety of the entire test device.

[0062] One end of the push rod 17 passes through the high-temperature furnace pad 19 and extends into the high-temperature furnace chamber 9, while the other end is connected to an external drive device. The push rod 17 is used to push the test sample out of the high-temperature ceramic support 1 by moving in a straight line under the drive of the external drive device after the test (ensuring that the sample can be easily removed after the test for subsequent analysis and testing). A dynamic seal is provided between the push rod 17 and the high-temperature furnace chamber 9 to ensure that the airtightness of the high-temperature furnace chamber is not damaged when the push rod is pushed out / retracted. The external drive device is electrically connected to the servo control system.

[0063] Hollow guide sleeves 14 are provided on both sides of the upper mold base 11 and the lower mold base 12. Guide posts 13 are embedded in the guide sleeves 14. The guide posts 13 serve as guide devices to guide the high-temperature furnace cover 16 to dock and match with the high-temperature furnace cavity 9.

[0064] The mold handle 15 is connected to the load head 2 and is used to transmit external pressure to the load head 2 shown.

Claims

1. A testing device for the high-temperature bending creep properties of ceramic materials, characterized in that... include: High-temperature load loading system, deformation detection system, span adjustment mechanism (4), inert gas protection system and servo control system; The high-temperature load application system is used to apply a preset load to the test sample; the deformation detection system is used to detect the temperature, deformation, and deflection data of the test sample; the inert gas protection system is used to prevent oxidation of the test sample; and the servo control system is used to control the testing device. The high-temperature load loading system includes a lower support roller (3), a high-temperature resistant ceramic bracket (1), and a load head (2); the high-temperature resistant ceramic bracket (1) is fixed on the lower support roller (3) and is used to place the test sample; the load head (2) is located directly above the test sample and is used to apply the preset load to the test sample; The deformation detection system includes a laser displacement sensor (6), a thermocouple (5), an infrared thermometer (7), and a data acquisition module (8). The span adjustment mechanism (4) is used to preset the span between the lower support rollers (3) according to the length of the test sample and adjust the span. The inert gas protection system is used to introduce inert gas into the high-temperature furnace cavity (9) during the test and to circulate airflow within the high-temperature furnace cavity (9); The servo control system is electrically connected to the load head (2), the data acquisition module (8), and the span adjustment mechanism (4).

2. The testing device for the high-temperature bending creep properties of ceramic materials according to claim 1, characterized in that: The testing device is used to test the bending creep performance of the test sample in a relatively closed high-temperature environment consisting of a high-temperature furnace cavity (9) and a high-temperature furnace cover (16). The relatively closed high-temperature environment is equipped with a heating unit and a temperature control unit. The servo control system is electrically connected to the heating unit and the temperature control unit. The lower support roller (3) is a symmetrically arranged double roller or an equidistantly arranged three roller; The high-temperature resistant ceramic support (1) has a groove on its upper part, and the test sample is fixed to the high-temperature resistant ceramic support (1) by the groove; the surface of the high-temperature resistant ceramic support (1) is coated with a ceramic coating. The load head (2) is made of ceramic.

3. The testing device for the high-temperature bending creep properties of ceramic materials according to claim 1, characterized in that: The test sample is a ceramic strip to be subjected to creep.

4. The testing device for the high-temperature bending creep properties of ceramic materials according to claim 1, characterized in that: The thermocouple (5), the laser displacement sensor (6), and the infrared thermometer (7) are connected to the data acquisition module (8) via a signal transmission component; the measurement axis of the laser displacement sensor (6) coincides with the center vertical line of the test sample, and the laser displacement sensor (6) is used for non-contact detection of the deflection data of the test sample; the thermocouple (5) and the infrared thermometer (7) are used to collaboratively test the temperature data of the test sample; the data acquisition module (8) is used to acquire and store the temperature, deformation, and deflection data; The laser displacement sensor (6) is fixed at the top center of the high-temperature furnace cavity (9); The signal transmission component is an optical fiber; The thermocouple (5) is embedded in the high-temperature furnace cavity (9) on both sides of the sample to be tested; The infrared thermometer (7) is fixed inside the high-temperature furnace cavity (9) and aligned with the sample to be tested.

5. The testing device for the high-temperature bending creep properties of ceramic materials according to claim 1, characterized in that: The span adjustment mechanism (4) includes multiple sets of positioning holes and slots located on the inner wall of the high-temperature furnace cavity (9) and distributed on both sides of the test sample. The positioning holes and slots are used to install and fix the lower support roller (3). The surface of the positioning holes and slots is coated with a high-temperature resistant ceramic coating.

6. The testing device for the high-temperature bending creep properties of ceramic materials according to claim 1, characterized in that: The inert gas protection system includes a gas cylinder storing inert gas and an inert gas cylinder flow meter installed on the gas cylinder. The high-temperature furnace cavity (9) is provided with an inert gas inlet (10), which is connected to the gas cylinder outlet and the high-temperature furnace cavity (9). The high-temperature furnace cavity (9) is also provided with an exhaust port. The inert gas cylinder flow meter is electrically connected to the servo control system.

7. The testing device for the high-temperature bending creep properties of ceramic materials according to claim 6, characterized in that: The inert gas inlet (10) is a plurality of annularly distributed inlet holes located at the bottom of the high-temperature furnace cavity (9). The top of the high-temperature furnace cavity (9) is also provided with an exhaust port that forms an airflow circulation with the inert gas inlet (10). The inert gas introduced into the high-temperature furnace cavity (9) is nitrogen or argon.

8. The testing apparatus for the high-temperature bending creep properties of ceramic materials according to claim 1, characterized in that, The testing device also includes: a lower mold base plate (18), a lower mold base (12), a push rod (17), a guide post (13), a guide sleeve (14), a high-temperature furnace pad plate (19), a limiting block (20), a high-temperature furnace cover fixing plate (21), a high-temperature furnace cover fixing plate pad plate (22), and an upper mold base (11). The high-temperature furnace cavity (9) and the high-temperature furnace cover (16) are fixed between the upper mold base (11) and the lower mold base (12); the lower mold base (12) is also fixedly connected to the bottom of the lower mold base (12), the upper mold base (11) is also fixedly connected to the bottom of the high-temperature furnace cover fixing plate (22), the high-temperature furnace cover fixing plate (21) is also fixedly connected to the bottom of the high-temperature furnace cover fixing plate (22), the high-temperature furnace cover fixing plate (21) is fixedly connected to the limiting block (20), and the limiting block (20) is fixedly connected to the high-temperature furnace cover (16); the lower mold base (12) is also fixedly connected to the top of the high-temperature furnace base (19). One end of the push rod (17) passes through the high-temperature furnace pad (19) and extends into the high-temperature furnace cavity (9), while the other end is connected to an external drive device. The push rod (17) is used to push the test sample out of the high-temperature ceramic support (1) under the drive of the external drive device after the test is completed. A dynamic seal is provided between the push rod (17) and the high-temperature furnace cavity (9). The external drive device is electrically connected to the servo control system. Hollow guide sleeves (14) are provided on both sides of the upper mold base (11) and the lower mold base (12). The guide sleeves (14) are fitted with guide posts (13), which serve as guide devices to guide the high-temperature furnace cover (16) to dock and match with the high-temperature furnace cavity (9).

9. The testing apparatus for the high-temperature bending creep properties of ceramic materials according to claim 8, characterized in that, The testing device further includes a mold handle (15), which is connected to the load head (2) and is used to transmit external pressure to the load head (2).

10. The testing device for the high-temperature bending creep properties of ceramic materials according to claim 2, characterized in that: The high-temperature furnace cavity (9) adopts a double-shell structure. The inner shell of the high-temperature furnace cavity (9) is composed of corundum mullite fiber bricks, and the outer shell of the high-temperature furnace cavity (9) is composed of silicon carbide coated steel plate. The heating unit is a U-shaped silicon molybdenum rod.

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