A non-oxidizing environment small punch test system

Abstract

This invention discloses a non-oxidizing environment small punch testing system, relating to the field of material mechanical property testing technology. It includes: a testing host for providing and transmitting test loading force; a high-temperature gas-filled environment device connected to the testing host for conducting small punch tests in a high-temperature inert gas environment; the high-temperature gas-filled environment device includes an environment unit, a small punch fixture, and a deformation measurement unit, the small punch fixture being disposed inside the environment unit for mounting micro-samples; the deformation measurement unit for measuring the deformation of the micro-samples; and a water-cooling system connected to the high-temperature gas-filled environment device for cooling it. The aforementioned non-oxidizing environment small punch testing system can operate stably within a wide temperature range of 300℃ to 1000℃, effectively isolating the effects of high temperatures on the external structure and measuring components. The deformation measurement unit is in direct contact with the micro-sample, enabling precise capture of the micro-sample's own deformation, significantly improving measurement accuracy.

Description

Technical Field

[0001] This invention relates to the field of material mechanical property testing technology, and in particular to a small punch test system for non-oxidizing environments. Background Technology

[0002] The small punch test technique is an advanced method for evaluating the mechanical properties of materials (such as strength, creep properties, and fracture toughness) using tiny specimens, and is particularly suitable for sampling and testing materials in in-service equipment. This technique loads thin, sheet-like micro-specimens with a punch, records their load-displacement curves, and thus infers parameters such as the material's strength, creep properties, and fracture toughness.

[0003] Currently, existing small punch testing devices have significant limitations in high-temperature environment testing: First, most devices have a low upper limit to operating temperature, making it difficult to operate stably in environments above 300℃; second, the sealing performance of the devices is insufficient in high-temperature environments, which may lead to sample oxidation and affect the accuracy of test results; third, high temperatures have a significant impact on the measurement accuracy of force sensors and displacement measurement units, leading to data drift and measurement errors. Furthermore, the fixture structures of existing technologies are often quite complex, making it inconvenient to clamp micro-samples.

[0004] Therefore, there are still shortcomings and deficiencies in the existing technology, and there is an urgent need for a small punch test system that can operate in a wider temperature range, has good sealing and cooling effects, and can achieve high-precision direct deformation measurement. Summary of the Invention

[0005] The purpose of this invention is to provide a small punch test system for non-oxidizing environments, which solves the technical problems existing in the small punch test devices of the prior art.

[0006] To achieve the above objectives, the present invention provides a small punch test system for non-oxidizing environments, comprising:

[0007] The test host is used to provide and transmit the test loading force;

[0008] A high-temperature gas-filled environment device, connected to the test host, is used to conduct small punch tests in a high-temperature inert gas environment. The high-temperature gas-filled environment device includes an environment device, a small punch fixture, and a deformation measurement unit. The small punch fixture is disposed inside the environment device and is used to mount the micro sample. The deformation measurement unit is used to measure the deformation of the micro sample.

[0009] A water-cooling system is connected to the high-temperature gas-filled environment device for cooling it.

[0010] Preferably, the test host includes:

[0011] Host loading rack;

[0012] A loading drive system, mounted on the main loading frame, is used to output linear loading motion. The loading drive system includes a servo motor, a ball screw pair driven by the servo motor, and a pull rod that moves linearly with the ball screw pair. A force sensor for real-time detection of the test force is mounted on the pull rod.

[0013] Preferably, the small punching fixture has a split structure, including a separable micro sample tray, a test seat, and a guide block; the micro sample tray is installed in the test seat, and the micro sample is configured to be held between the guide block and the micro sample tray.

[0014] Preferably, the small punching fixture further includes a punching ball and a punching rod, the punching ball being placed on the micro sample, and the punching rod being fixedly connected to the upper pressure rod.

[0015] Preferably, the environmental device includes a heating furnace, an upper pressure rod, a lower pressure rod, and a sealed cooling structure, wherein a heat insulation layer is installed on the lower pressure rod and / or the upper pressure rod.

[0016] Preferably, the sealed cooling structure includes a quartz glass assembly, a water-cooled pull rod with internal cooling channels, a water-cooled flange with internal cooling channels, and a dynamic sealing tube sleeved outside the pull rod. The dynamic sealing tube is installed on the water-cooled flange, and the quartz glass assembly is embedded in the water-cooled flange.

[0017] Preferably, the water-cooled pull-down rod is located between the loading drive system and the pressure rod, with one end fixedly connected to the pull-down rod and the other end fixedly connected to the pressure rod. The pressure rod is fixedly connected to the test seat of the small punching fixture.

[0018] Preferably, the deformation measurement unit includes an extension rod and a deflection assembly; the deflection assembly is fixedly installed inside the water-cooled pull rod, and its output end is connected to one end of the extension rod; the other end of the extension rod is configured to form elastic contact with the lower surface of the micro-sample.

[0019] Preferably, the water cooling system includes a chiller, a water distribution drain, and a water distribution pipeline; the water cooling system is connected to the water-cooled pull rod and water-cooled flange of the high-temperature gas-filled environment device through the water distribution pipeline, and is configured to continuously supply circulating cooling water to the water-cooled pull rod and the water-cooled flange.

[0020] Preferably, the high-temperature gas-filled environment device further includes a gas-filling system; the gas-filling system includes a mechanical pump, a solenoid valve, and a gas-filling pipeline.

[0021] Compared to the aforementioned background technology, the non-oxidizing environment small punch testing system provided by this invention provides a high-temperature inert gas environment for the small punch test through a high-temperature gas filling environment device. The system can operate stably within a wide temperature range of 300℃ to 1000℃, effectively isolating the effects of high temperature on the external structure and measuring components, ensuring sealing performance and equipment lifespan at high temperatures. The small punching fixture makes the installation and replacement of micro-samples simple and quick, and maintenance convenient. The deformation measurement unit is in direct contact with the micro-sample, which can accurately capture the deformation of the micro-sample itself, significantly improving measurement accuracy. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the overall non-oxidizing environment small punch test system provided in an embodiment of the present invention;

[0024] Figure 2 This is a schematic diagram of the structure of the test host in the non-oxidizing environment small punch test system provided in the embodiment of the present invention;

[0025] Figure 3 This is a schematic diagram of the high-temperature gas-filled environment device in the non-oxidizing environment small punch test system provided in the embodiment of the present invention;

[0026] Figure 4 This is a partial structural schematic diagram of the high-temperature gas-filled environment device in the non-oxidizing environment small punch test system provided in the embodiments of the present invention;

[0027] Figure 5 for Figure 4 A magnified view of a portion of point A in the middle.

[0028] Figures 1 to 5Chinese reference numerals: 1. Test host; 11. Host loading frame; 111. Box structure; 112. Upper crossbeam; 113. Column; 12. Loading drive system; 121. Servo motor; 122. Reducer; 123. Ball screw pair; 124. Support cylinder; 125. Pull-down rod; 126. Force sensor; 2. High-temperature gas-filling environment device; 21. Environment device; 211. Heating furnace; 2111. Support; 212. Upper pressure rod; 213. Lower pressure rod; 214. Seal Cooling structure; 2141, Quartz glass assembly; 2142, Dynamic sealing tube; 2143, Water-cooled pull rod; 2144, Water-cooled flange; 215, Thermal insulation layer; 216, Middle crossbeam; 22, Small punching fixture; 221, Micro sample tray; 222, Test seat; 223, Guide block; 224, Micro sample; 225, Stamping ball; 226, Stamping rod; 23, Deformation measurement unit; 231, Extension rod; 232, Deflection assembly; 24, Inflation system; 3, Water cooling system. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] This invention provides a non-oxidizing environment small punch test system. Through the high-temperature gas-filled environment device 2, it can work stably in a wide temperature range of 300℃ to 1000℃, effectively isolating the influence of high temperature on the external structure and measuring components, ensuring the sealing performance and equipment life under high temperature. The deformation measuring unit 23 is in direct contact with the micro sample 224, which can accurately capture the deformation of the micro sample 224 itself, significantly improving the measurement accuracy.

[0032] Please refer to this as well. Figures 1 to 5 The non-oxidizing environment small punch test system provided by the present invention includes:

[0033] Test host 1, used to provide and transmit test loading force;

[0034] The high-temperature gas-filled environment device 2 is connected to the test host 1 and is used to conduct small punch tests in a high-temperature inert gas environment. The high-temperature gas-filled environment device 2 includes an environment device 21, a small punch fixture 22 and a deformation measurement unit 23. The small punch fixture 22 is set inside the environment device 21 and is used to install the micro sample 224. The deformation measurement unit 23 is used to measure the deformation of the micro sample 224.

[0035] The water cooling system 3 is connected to the high-temperature gas-filled environment device 2 and is used to cool it.

[0036] The small punching fixture 22 is set inside the environmental device 21 in the high-temperature gas-filled environment device 2. The micro sample 224 is installed in the small punching fixture 22. When the micro sample 224 is installed, the test host 1 can provide and transmit the test loading force. Since the high-temperature gas-filled environment device 2 is connected to the test host 1, the test loading force can be transmitted to the micro sample 224 so as to carry out the loading test. During the loading test, the deformation of the micro sample 224 is measured by the deformation measurement unit 23, which can accurately capture the deformation of the micro sample 224 itself.

[0037] This setup, through the high-temperature gas environment device 2, provides a high-temperature inert gas environment for the small punch test. The system can operate stably within a wide temperature range of 300℃ to 1000℃, effectively isolating the effects of high temperature on the external structure and measuring components, ensuring sealing performance and equipment lifespan under high temperatures. The small punch clamp 22 makes the installation and replacement of the micro sample 224 simple and quick, and maintenance convenient. The deformation measurement unit 23 is in direct contact with the micro sample 224, which can accurately capture the deformation of the micro sample 224 itself, significantly improving the measurement accuracy.

[0038] In some embodiments, the test host 1 includes:

[0039] Host loading rack 11;

[0040] The loading drive system 12 is mounted on the main loading frame 11 and is used to output linear loading motion. The loading drive system 12 includes a servo motor 121, a ball screw pair 123 driven by the servo motor 121, and a pull rod 125 that moves linearly with the ball screw pair 123. A force sensor 126 for real-time detection of the test force is mounted on the pull rod 125.

[0041] Please refer to this as well. Figures 1 to 2The test host 1 includes a host loading frame 11 and a loading drive system 12. The host loading frame 11 has a portal frame structure, specifically including a box-shaped structure 111, an upper crossbeam 112 located above the box-shaped structure 111, and two columns 113 located between the box-shaped structure 111 and the upper crossbeam 112. The two columns 113 are vertically arranged and located on both sides of the box-shaped structure 111, with their ends fixedly connected to the top of the box-shaped structure 111 and the upper crossbeam 112, respectively. All parts of the host loading frame 11 are made of high-quality steel and mainly bear the test force. The columns 113 are precision machined and chrome-plated, resulting in an aesthetically pleasing surface, high load-bearing capacity, and good guiding accuracy.

[0042] The loading drive system 12 is mounted on the main loading frame 11. The loading drive system 12 includes a servo motor 121, a reducer 122, a ball screw pair 123, a support cylinder 124, and a pull rod 125. The servo motor 121 and reducer 122 are installed within the box-shaped structure 111 of the main loading frame 11. The servo motor 121 is connected to the reducer 122 via a toothed belt. The support cylinder 124 has a sleeve-like structure and is fixed vertically within the box-shaped structure 111. The ball screw pair 123 is mounted on the support cylinder 124. The output shaft of the reducer 122 is connected to the ball screw in the ball screw pair 123. The ball screw is rotatably supported and fixed on the support cylinder 124 via bearings. The pull rod 125 is positioned along the set direction and is fixedly connected to the nut block on the ball screw in the ball screw pair 123. Smooth and precise linear motion can be output through the ball screw pair 123.

[0043] During the test, the servo motor 121 drives the reducer 122 via a toothed belt. The output shaft of the reducer 122 drives the ball screw in the ball screw pair 123 to rotate. As the ball screw rotates, the nut block on the ball screw moves along the axis of the ball screw, i.e., in the vertical direction. Since the pull rod 125 is fixedly connected to the nut block, the pull rod 125 can move with the movement of the nut block. The high-temperature gas-filled environment device 2 is connected to the pull rod 125 in the test host 1, so the movement of the pull rod 125 can provide the test loading force and transmit it to the high-temperature gas-filled environment device 2 for loading test. The force sensor 126 on the pull rod 125 can measure the magnitude of the test force in real time.

[0044] In some embodiments, the small punching fixture 22 is a split structure, including a separable micro sample tray 221, a test seat 222, and a guide block 223; the micro sample tray 221 is installed in the test seat 222, and the micro sample 224 is configured to be clamped between the guide block 223 and the micro sample tray 221.

[0045] Please refer to this as well. Figure 1 , Figures 4 to 5The small punching fixture 22 is installed inside the environmental device 21 and has a split structure, including a separable micro-sample tray 221, a test seat 222, and a guide block 223. The test seat 222 has a cavity structure in its top, and the micro-sample tray 221 is installed inside the cavity structure of the test seat 222. The micro-sample tray 221 has a tray structure, and the micro-sample 224 is installed between the guide block 223 and the micro-sample tray 221. The small punching fixture 22 adopts a split design, which facilitates the installation and replacement of the micro-sample 224, which is precisely clamped between the guide block 223 and the micro-sample tray 221.

[0046] In some embodiments, the small punching fixture 22 further includes a punching ball 225 and a punching rod 226, with the punching ball 225 placed on the micro sample 224 and the punching rod 226 fixedly connected to the upper pressure rod 212.

[0047] Please refer to this as well. Figures 4 to 5 The small punching fixture 22 also includes a punching ball 225 and a punching rod 226. The punching ball 225 has a spherical structure and is placed on the micro sample 224. The punching rod 226 is arranged vertically, with its top end fixed to the upper crossbeam 112 of the main loading frame 11, and its bottom end passing through the guide block 223 and abutting against the top of the punching ball 225.

[0048] During the test, the loading drive system 12 operates, providing and transmitting the test loading force to the high-temperature gas-filled environment device 2 through the pull-down rod 125 in the loading drive system 12. Under the action of the test loading force, the test seat 222 and the micro sample tray 221 of the entire small punching fixture 22 are pushed upward. As the fixture base rises, the punching ball 225 placed on the micro sample 224 contacts the bottom end of the fixed punching rod 226. The punching rod 226 prevents the punching ball 225 from moving upward, thereby applying a concentrated load to the micro sample 224 in the middle, causing the micro sample 224 to begin to deform. The central part gradually dents under the action of the punching ball 225 and is eventually punched through. The force sensor 126 installed on the pull-down rod 125 detects and records the force applied to the micro sample 224 in real time throughout the process.

[0049] In some embodiments, the environmental device 21 includes a heating furnace 211, an upper pressure rod 212, a lower pressure rod 213, and a sealed cooling structure 214, wherein a heat insulation layer 215 is installed on the lower pressure rod 213 and / or the upper pressure rod 212.

[0050] Please refer to this as well. Figure 1 , Figures 3 to 4The heating furnace 211 is fixedly mounted on the test host 1 via a bracket 2111. The heating furnace 211 is a split-type, two-section resistance wire radiant heating atmospheric furnace with a double-layered stainless steel outer shell and an integrated furnace chamber. The resistance wire is made of high-quality metal material, characterized by its durability. The upper pressure rod 212 and lower pressure rod 213 are made of heat-resistant stainless steel. By installing a heat insulation layer 215 on the lower pressure rod 213 and / or the upper pressure rod 212, heat insulation is achieved, effectively preventing heat loss.

[0051] In some embodiments, the sealed cooling structure 214 includes a quartz glass assembly 2141, a water-cooled pull rod 2143 with internal cooling channels, a water-cooled flange 2144 with internal cooling channels, and a dynamic sealing tube 2142 sleeved on the pull rod 213. The dynamic sealing tube 2142 is installed on the water-cooled flange 2144, and the quartz glass assembly 2141 is embedded in the water-cooled flange 2144.

[0052] Please refer to this as well. Figures 3 to 4 To ensure sealing, a dynamic sealing tube 2142 is installed outside the pressure rod 213, and the water-cooled pull rod 2143 and water-cooled flange 2144 also ensure the sealing of the environmental device 21. The dynamic sealing tube 2142 has a thermocouple mounting interface and a gas filling system 24 interface for filling inert gas into the dynamic sealing tube 2142 during testing. The dynamic sealing tube 2142 is installed on the water-cooled flange 2144, and a central crossbeam 216 is fixedly installed below the water-cooled flange 2144. The central crossbeam 216 is fixedly installed on the main loading frame 11 of the test host 1. The quartz glass assembly 2141 is embedded in the water-cooled flange 2144. The water-cooled pull rod 2143 serves both connection and cooling functions, and the water-cooled flange 2144 is used for furnace sealing and cooling. The water-cooled pull rod 2143 and the water-cooled flange 2144 form an effective double-sided water-cooled barrier.

[0053] In some embodiments, the water-cooled pull-down rod 2143 is located between the loading drive system 12 and the pressure rod 213, with one end fixedly connected to the pull-down rod 125 and the other end fixedly connected to the pressure rod 213. The pressure rod 213 is fixedly connected to the test seat 222 of the small punching fixture 22.

[0054] Please refer to this as well. Figures 1 to 4 After the loading drive system 12 of the test host 1 is started, the servo motor 121 drives the pull rod 125 to move downward through the ball screw pair 123. The pull rod 125 pushes the small punching fixture 22 to move upward through the water-cooled pull rod 2143 and the pressure rod 213, applying a loading force to the micro sample 224. Under the action of the force, the punching rod 226 causes the punching ball 225 to continuously squeeze the micro sample 224 until the micro sample 224 is punched.

[0055] In some embodiments, the deformation measurement unit 23 includes an extension rod 231 and a deflection assembly 232; the deflection assembly 232 is fixedly installed inside the water-cooled pull rod 2143, and its output end is connected to one end of the extension rod 231; the other end of the deflection assembly 232 is configured to form elastic contact with the lower surface of the micro sample 224.

[0056] Please refer to this as well. Figures 3 to 5 The deformation measurement unit 23 includes an extension rod 231 and a deflection assembly 232. The extension rod 231 and the deflection assembly 232 are installed inside the water-cooled pull rod 2143. The output end of the deflection assembly 232 is connected to the extension rod 231, and the other end of the deflection assembly 232 is in elastic contact with the lower surface of the micro sample 224.

[0057] During the test, when the center of the micro-sample 224 bends downward under the test loading force, the extension rod 231 moves downward accordingly. The extension rod 231 transmits the displacement to the deflection assembly 232 installed inside the water-cooled pull rod 2143. The deflection assembly 232 converts the mechanical displacement into an electrical signal, and measures and records the actual displacement value of the center of the micro-sample 224 in real time.

[0058] The deformation measurement unit 23 is directly integrated into the test environment. It makes direct elastic contact with the micro sample 224 through the deflection component 232. The deformation displacement of the sample can be converted into an electrical signal in real time through the deflection component 232, realizing direct and high-precision measurement of the deformation of the micro sample 224, which can effectively reduce the error.

[0059] In some embodiments, the water cooling system 3 includes a chiller, a water distribution drain, and a water distribution pipeline; the water cooling system 3 is connected to the water-cooled pull-down rod 2143 and the water-cooled flange 2144 of the high-temperature gas-filled environment device 2 through the water distribution pipeline, and is configured to continuously supply circulating cooling water to the water-cooled pull-down rod 2143 and the water-cooled flange 2144.

[0060] The water cooling system 3 includes a chiller, a water distribution drain, and water distribution pipes. The chiller continuously provides circulating cooling water, which flows through the water distribution drain, water distribution pipes, and cooling channels to the water-cooled pull rod 2143 and water-cooled flange 2144 of the high-temperature gas-filled environment device 2, ensuring that the temperature of these components and the adjacent deformation measurement unit 23 does not exceed 25°C, thereby protecting the sensor and maintaining the performance of the seals.

[0061] In some embodiments, the high-temperature gas-filled environment device 2 further includes a gas-filled system 24; the gas-filled system 24 includes a mechanical pump, a solenoid valve, and a gas-filled pipeline.

[0062] The gas filling system 24 mainly includes gas filling pipelines, a mechanical pump, valves, a solenoid valve, and a pressure gauge. During the test, the gas filling system 24 first evacuates the heating furnace 211, then fills it with inert gas. It can automatically maintain a slightly positive pressure inert atmosphere within the heating furnace 211 based on pressure feedback, ensuring a non-oxidizing test environment. Specifically, to ensure that the micro-sample 224 is tested in an inert gas environment, the heating furnace 211 is first evacuated by the gas filling system 24 for 1-2 minutes. The solenoid valve controls the gas filling system 24 to determine whether to fill the heating furnace 211. When the pressure value displayed on the pressure gauge approaches 0 MPa, the gas filling system 24 fills the heating furnace 211; when the pressure gauge pressure exceeds 0.01 MPa, the gas filling system 24 stops filling the heating furnace 211.

[0063] In some embodiments, the non-oxidizing environment small punch test system provided by the present invention also includes a control system, which is based on an EDC fully digital measurement controller and controls the servo motor 121 to load the load through a servo driver. The controller forms a distributed control system with the host computer through Ethernet communication and mainly includes the following functions: (1) Offline test function: The controller can be disconnected from the host computer and set the test parameters through the hand control box to complete the test independently. After the host computer is connected, the controller automatically transmits the data to the computer. The controller can communicate with the temperature controller, display the test temperature, and control it, ensuring that the entire test process is completely free from interference and can recover the temperature data offline. The temperature is automatically increased according to the test conditions, and the specified test is automatically performed when the set ambient temperature is reached, which improves the flexibility and reliability of the equipment. (2) Dynamic calibration function: During the test, the controller automatically calibrates the load measurement system at specific intervals to prevent its temperature drift and ensure the measurement and control accuracy. It ensures the accuracy and reliability of the load measurement and provides a reliable foundation for the stability of long-term tests. (3) High resolution and no gear shifting throughout the entire process: A high-resolution (e.g., ±10 million yards) measurement system is used, and no gear shifting is required throughout the entire process, ensuring the measurement accuracy and consistency from the initial stage to the fracture.

[0064] The detailed usage process of the non-oxidizing environment small punch test system provided by this invention is as follows:

[0065] Preparation and Sample Loading: Open the split furnace body of heating furnace 211 to expose the small punching fixture 22. Place the micro sample tray 221 into the test stand 222. Precisely place the micro sample 224 on the central groove of the micro sample tray 221. Place the stamping ball 225 at the center of the upper surface of the micro sample 224. Cover with the guide block 223, ensuring it mates with the test stand 222 to precisely confine the micro sample 224 and the stamping ball 225 in the center position. At this time, the stamping rod 226 is fixed on the upper pressure rod 212, aligned with the hole of the guide block 223, and used to apply pressure to the stamping ball 225. Finally, close the furnace body and ensure it is sealed. Confirm that the water cooling system 3 is operating normally, with cooling water continuously flowing through the water distributor and pipelines to the water-cooled pull-down rod 2143 and the water-cooled flange 2144, forming "double-sided water cooling". This ensures that the high temperature of the furnace body will not be conducted outward, protecting the external dynamic seal, force sensor 126 and the deflection component 232 of deformation measurement unit 23, keeping their temperature below 25°C, and ensuring their measurement accuracy and lifespan.

[0066] Environment setup and heating: The mechanical pump of the charging system 24 is activated via the control system. The mechanical pump evacuates the interior of the furnace through the interface on the dynamic sealing pipe 2142 for approximately 1-2 minutes to remove as much reactive gas as possible, such as oxygen. When the pressure gauge of the charging system 24 detects that the furnace pressure is close to 0 MPa (gauge pressure, i.e., close to atmospheric pressure), the system automatically opens the solenoid valve to charge the furnace with high-purity inert gas (such as argon). When the pressure gauge detects that the furnace pressure is slightly higher than atmospheric pressure (e.g., >0.01 MPa gauge pressure, i.e., slightly positive pressure), the solenoid valve closes, and the charging stops.

[0067] Set the target test temperature (between 300℃ and 1000℃) on the host computer or manual control box of the control system. Start the heating program, and the atmospheric furnace will begin heating. After reaching the target temperature, the system will automatically enter the heat preservation stage to wait for the temperature to stabilize. Throughout the entire heating and heat preservation process, the water cooling system 3 will continue to work to ensure that the high temperature is strictly confined inside the furnace.

[0068] Loading Test and Data Acquisition: The control system sends a signal to the servo driver to start the servo motor 121. The servo motor 121 drives the reducer 122 via a toothed belt, and the reducer 122 drives the ball screw to rotate. The rotational motion of the ball screw is converted into a precise and uniform downward linear motion of the pull rod 125. The pull rod 125 transmits the motion to the pressure rod 213 via the water-cooled pull rod 2143. The pressure rod 213 pushes the base of the entire small punching fixture 22 (test seat 222 and micro sample tray 221) upward;

[0069] As the fixture base rises, the stamping ball 225 placed on the micro-sample 224 contacts the fixed stamping rod 226. The stamping rod 226 prevents the stamping ball 225 from moving upward, thus applying a concentrated load to the micro-sample 224 in the middle. The micro-sample 224 begins to deform, and the central part gradually concaves under the action of the stamping ball 225, eventually being punched through. The force sensor 126 mounted on the pull rod 125 detects and records the force applied to the sample in real time throughout the process. When the center of the micro-sample 224 bends downward, the extension rod 231 moves downward accordingly, transmitting the displacement to the deflection assembly 232 protected inside the water-cooled pull rod 2143. The deflection assembly 232 converts the mechanical displacement into an electrical signal, measuring and recording the actual displacement value of the center of the micro-sample 224 in real time. The control system synchronously acquires signals from the force sensor 126 and the deformation measurement unit 23, and plots and stores load and displacement curves in real time. Using the high-precision load and displacement curves, the mechanical properties parameters such as yield strength, tensile strength, creep performance, and fracture toughness of the tested material can be derived.

[0070] The non-oxidizing environment small punch testing system provided by this invention can operate stably in a wide temperature range of 300℃ to 1000℃, effectively isolating the effects of high temperature on the external structure and measuring sensors, ensuring sealing performance and equipment lifespan under high temperature conditions. The split-type small punch fixture 22 design makes the installation and replacement of micro-samples 224 simple and quick, and convenient for operation and maintenance. The direct contact deformation measurement unit 23 can accurately capture the deformation of the micro-samples 224 themselves. Combined with a high-resolution, non-segmented control system with dynamic calibration function, the accuracy of load and displacement measurements is significantly improved.

[0071] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0072] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the present invention.

Claims

1. A non-oxidizing environment small punch test system, characterized by, include: Test host (1), used to provide and transmit test loading force; A high-temperature gas-filled environment device (2) is connected to the test host (1) and is used to conduct small punch tests in a high-temperature inert gas environment. The high-temperature gas-filled environment device (2) includes an environment device (21), a small punch fixture (22), and a deformation measurement unit (23). The small punch fixture (22) is set inside the environment device (21) and is used to install micro-samples (224). The deformation measurement unit (23) is used to measure the deformation of the micro-samples (224). A water cooling system (3) is connected to the high-temperature gas-filled environment device (2) for cooling it.

2. The non-oxidizing environment small punch test system of claim 1, wherein, The test host (1) includes: Host loading rack (11); The loading drive system (12) is mounted on the host loading frame (11) and is used to output linear loading motion. The loading drive system (12) includes a servo motor (121), a ball screw pair (123) driven by the servo motor (121), and a pull rod (125) that moves linearly with the ball screw pair (123). A force sensor (126) for real-time detection of the test force is mounted on the pull rod (125).

3. The non-oxidizing environment small punch test system according to claim 1, characterized in that, The small punching fixture (22) is a split structure, including a separable micro sample tray (221), a test seat (222), and a guide block (223); the micro sample tray (221) is installed in the test seat (222), and the micro sample (224) is configured to be clamped between the guide block (223) and the micro sample tray (221).

4. The non-oxidizing environment small punch test system according to claim 3, characterized in that, The small punching fixture (22) also includes a punching ball (225) and a punching rod (226). The punching ball (225) is placed on the micro sample (224), and the punching rod (226) is fixedly connected to the upper pressure rod (212).

5. The non-oxidizing environment small punch test system according to claim 2, characterized in that, The environmental device (21) includes a heating furnace (211), an upper pressure rod (212), a lower pressure rod (213), and a sealed cooling structure (214), wherein a heat insulation layer (215) is installed on the lower pressure rod (213) and / or the upper pressure rod (212).

6. The non-oxidizing environment small punch test system according to claim 5, characterized in that, The sealed cooling structure (214) includes a quartz glass assembly (2141), a water-cooled pull rod (2143) with internal cooling channels, a water-cooled flange (2144) with internal cooling channels, and a dynamic sealing tube (2142) sleeved outside the pull rod (213). The dynamic sealing tube (2142) is installed on the water-cooled flange (2144), and the quartz glass assembly (2141) is embedded in the water-cooled flange (2144).

7. The non-oxidizing environment small punch test system according to claim 6, characterized in that, The water-cooled pull rod (2143) is located between the loading drive system (12) and the pressure rod (213). One end is fixedly connected to the pull rod (125), and the other end is fixedly connected to the pressure rod (213). The pressure rod (213) is fixedly connected to the test seat (222) of the small punching fixture (22).

8. The non-oxidizing environment small punch test system according to claim 7, characterized in that, The deformation measurement unit (23) includes an extension rod (231) and a deflection assembly (232); the deflection assembly (232) is fixedly installed inside the water-cooled pull rod (2143), and its output end is connected to one end of the extension rod (231); the other end of the deflection assembly (232) is configured to form an elastic contact with the lower surface of the micro sample (224).

9. The non-oxidizing environment small punch test system according to claim 6, characterized in that, The water cooling system (3) includes a chiller, a water distribution drain and a water distribution pipeline; the water cooling system (3) is connected to the water-cooled pull rod (2143) and the water-cooled flange (2144) of the high-temperature gas-filled environment device (2) through the water distribution pipeline, and is configured to continuously supply circulating cooling water to the water-cooled pull rod (2143) and the water-cooled flange (2144).

10. The non-oxidizing environment small punch test system according to claim 1, characterized in that, The high-temperature gas-filled environment device (2) also includes a gas-filling system (24); the gas-filling system (24) includes a mechanical pump, a solenoid valve and a gas-filling pipeline.

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