In-situ high-temperature loading device and mechanical property testing system and method

Abstract

The invention discloses an in-situ high-temperature loading device and a mechanical property testing system and method.In the device, the outer side face of a heat conduction cylinder is evenly heated through a heating resistance wire which is electrified and heated, so that the top end face, making contact with a sample material, of the heat conduction cylinder is evenly heated, and therefore a high-temperature environment can be provided for the sample material; and moreover, a uniform high-temperature environment is provided, so that the influence of non-uniform temperature distribution on a mechanical performance test result is avoided. In the system, the temperature provided by the in-situ high-temperature loading device can be controlled through the main control module, the in-situ high-temperature loading device and the cooling module can also be controlled through the main control module, the provided temperature is controlled through the cooperation of the in-situ high-temperature loading device and the cooling module, and the temperature of the in-situ high-temperature loading device can be controlled under the condition that the heating resistance wire is not heated. The cooling module is controlled to work through the main control module, and a low-temperature environment is provided for the sample material.

Description

Technical Field

[0001] The present invention relates to the technical field of microstructure experiments, and in particular to an in-situ high-temperature loading device, a mechanical property testing system and a method. Background Art

[0002] Micro-tensile technology gives people the opportunity to directly observe deformation, strengthening and failure processes at the microscopic scale, and to perform in-situ quantitative micromechanical property characterization, so as to have a deeper understanding of the relationship between material microstructure and mechanical properties. However, the important microstructure of general engineering materials generally changes at high temperatures. The study of fracture processes, including the formation of slip bands, microcrack initiation, growth and propagation behavior, is very important for the prediction of material properties and service life. Many industrial applications and high-tech fields (such as aerospace, energy, and automobiles) require materials to maintain stable performance at high temperatures. Understanding the mechanical behavior of materials at high temperatures (such as strength, ductility, fatigue performance, etc.) is crucial for material selection and design. At the same time, studying the microstructural stability from micro to nanoscale during microcrack propagation at high temperatures will help to better understand material properties. The use of high-temperature environment devices in scanning electron microscopes enables tensile table experiments to not only obtain the relationship between the microstructure and mechanical properties of materials under relevant conditions, but also provide high-resolution grain and orientation maps using electron backscatter diffraction of scanning electron microscopes. During the experiment, the in-situ high-temperature loading device provides an environment that can simulate actual working conditions, helping researchers to more accurately evaluate the performance of materials at high temperatures. By understanding the behavior of materials at high temperatures, it can guide the development of new materials, optimize engineering design, and improve the reliability and durability of materials. In addition to high temperatures, sometimes it is necessary to study the microstructural changes of engineering materials at lower temperatures. Summary of the invention

[0003] The purpose of the present invention is to meet the demand for understanding the performance of materials under high temperature conditions, to provide important experimental data and theoretical basis for industrial applications and scientific research, and to provide an in-situ high-temperature loading device, a mechanical properties testing system and method. The in-situ high-temperature loading device can provide a high-temperature environment for the sample material when conducting micromechanics and microstructure research using scanning electron microscopes, optical microscopes, spectrometers and other equipment.

[0004] To achieve the above purpose, the technical solution provided by the present invention is:

[0005] An in-situ high-temperature loading device comprises a heating module, a heat insulation module and a limiter;

[0006] The thermal insulation module is provided with a containing cavity;

[0007] The heating module includes a heat-conducting cylinder and a heating resistance wire connected to the circuit;

[0008] The heat-conducting cylinder is disposed in the accommodating cavity;

[0009] The heating resistance wire is wound around the outer surface of the heat-conducting cylinder;

[0010] The limiting member is installed at the cavity opening of the accommodating cavity to limit the sample material at the top of the heat-conducting cylinder.

[0011] In the present technical solution, the outer side surface of the heat-conducting cylinder is evenly heated by the heating resistance wire after being energized and heated, so that the top surface of the heat-conducting cylinder in contact with the sample material is evenly heated, thereby not only providing a high-temperature environment for the sample material, but also providing a uniform high-temperature environment, thereby avoiding the influence of uneven temperature distribution on the results of mechanical performance testing.

[0012] Furthermore, the inner surface of the accommodating cavity is paved with a heat-insulating layer, which can effectively isolate the heat source.

[0013] Furthermore, the thermal insulation module is provided with a limiting structure;

[0014] The limiting structure cooperates with the limiting member to limit the position of the sample material;

[0015] The limiting member is provided with an observation hole.

[0016] In the present technical solution, the limiting structure cooperates with the limiting member to limit the sample material, thereby preventing the sample material from shifting left and right and affecting subsequent observations; through the observation hole of the limiting member, the microstructural changes of the sample material in a high temperature environment can be observed.

[0017] Furthermore, the technical solution also provides a mechanical property testing system, which includes the above-mentioned in-situ high-temperature loading device, a cooling module, an observation module, a micro-stretching module and a main control module;

[0018] The cooling module is connected to the heating module;

[0019] The micro-stretching module is connected to the sample material to impart micro-stretching force to the sample material;

[0020] The observation module is arranged above the heating module and faces the sample material;

[0021] A temperature sensor is installed on the inner side wall of the accommodating cavity;

[0022] The main control module is connected to the high temperature loading device, the cooling module and the temperature sensor respectively.

[0023] In the present technical solution, the temperature provided by the in-situ high-temperature loading device can be controlled by the main control module, and the in-situ high-temperature loading device and the cooling module can also be controlled by the main control module. The in-situ high-temperature loading device and the cooling module cooperate to control the provided temperature. The cooling module can also be controlled by the main control module to provide a lower temperature environment for the sample material when the heating resistance wire is not heated.

[0024] This technical solution can provide different ambient temperatures for the sample material according to actual conditions.

[0025] Furthermore, the heat insulation module is provided with a cooling pipe winding around the interior of the heat-conducting cylinder;

[0026] The cooling module is connected to both ends of the cooling pipeline through cooling pipes to form a closed-loop cooling liquid delivery channel.

[0027] In this technical solution, by forming a closed-loop coolant delivery channel, low-temperature coolant is continuously and cyclically injected into the cooling pipe, so that the heat generated and conducted by the heating resistance wire can be stably neutralized to achieve the purpose of cooling and temperature control, and at the same time, it can also ensure that the equipment is not damaged by high temperature. In addition, when the heating resistance wire is not heated, a low-temperature environment with a constant temperature can be provided for the sample material alone.

[0028] Furthermore, the cooling pipe is closely attached to the inner wall of the heat-conducting cylinder and is in a "Π" shape, so that the cooling pipe can quickly transfer cold energy to the heat-conducting cylinder.

[0029] Further, the cooling module includes a cooling table base and an end cover;

[0030] The cooling platform base is provided with a cooling space, in which a cooling component, a coolant inlet and a coolant outlet are arranged;

[0031] The end cover is covered on the cooling platform base to close the cooling space.

[0032] Further, the cooling assembly includes a cooling rod and a cooling plate;

[0033] The cooling rod is arranged in the middle of the cooling space, and the cooling plates are arranged around the cooling rod respectively;

[0034] The cooling liquid inlet and the cooling liquid outlet are located on both sides of the cooling rod and are respectively located between the cooling rod and the corresponding cooling plate.

[0035] The technical solution can rapidly cool down the coolant entering the cooling space and improve the cooling effect by arranging the cooling rod, the cooling plate, the coolant inlet and the coolant outlet in the cooling space.

[0036] Furthermore, the technical solution also provides a mechanical property testing method, which is implemented by using the above-mentioned mechanical property testing system, including:

[0037] The sample material is placed on the heating module and the sample material is limited by the limiting piece;

[0038] The micro-tensile module is connected to both ends of the sample material;

[0039] The main control module controls the circuit to make the heating resistor wire heat up, thereby uniformly heating the heat-conducting cylinder and transferring the heat to the sample material;

[0040] The micro-stretching module performs micro-stretching operations on the sample material, and observes the microstructural changes of the sample material in real time through the observation module.

[0041] Furthermore, it also includes controlling the cooperation between the cooling module and the high-temperature loading device through the main control module, so as to control the temperature required by the sample material during the mechanical property test.

[0042] Compared with the prior art, the principles and advantages of this technical solution are as follows:

[0043] 1. The outer side of the heat-conducting cylinder is evenly heated by the heating resistance wire after being powered on and heated, so that the top surface of the heat-conducting cylinder in contact with the sample material is evenly heated, thereby providing not only a high-temperature environment for the sample material, but also a uniform high-temperature environment, avoiding the influence of uneven temperature distribution on the results of mechanical performance testing.

[0044] 2. The limiting structure cooperates with the limiting part to limit the sample material, which can avoid the sample material from shifting left and right, affecting subsequent observation; in addition, through the observation hole of the limiting part, it is convenient to observe the microstructural changes of the sample material in a high temperature environment.

[0045] 3. In the mechanical properties testing system, the temperature provided by the in-situ high-temperature loading device can be controlled by the main control module, and the in-situ high-temperature loading device and the cooling module can also be controlled by the main control module. The in-situ high-temperature loading device and the cooling module can cooperate to control the provided temperature. The cooling module can also be controlled by the main control module to provide a lower temperature environment for the sample material when the heating resistance wire is not heated.

[0046] 4. By forming a closed-loop coolant delivery channel, low-temperature coolant is continuously injected into the cooling pipe in a cycle, so that the heat generated and conducted by the heating resistance wire can be stably neutralized to achieve the purpose of cooling and temperature control, and at the same time, it can also ensure that the equipment is not damaged by high temperature. In addition, it can also provide a constant temperature low-temperature environment for the sample material alone without heating the heating resistance wire.

[0047] 5. By arranging the cooling rod, cooling plate, coolant inlet and coolant outlet in the cooling space, the coolant entering the cooling space can be cooled down quickly, thereby improving the cooling effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the services required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0049] Figure 1 A three-dimensional diagram of an in-situ high-temperature loading device of the present invention (already loaded with sample materials);

[0050] Figure 2 This is a three-dimensional diagram of a heating module and a heat insulation module in an in-situ high-temperature loading device of the present invention after being combined (the limiting member is omitted);

[0051] Figure 3 It is a cross-sectional view of a heating module and a heat insulation module in an in-situ high-temperature loading device of the present invention after being combined (the limiting member is omitted);

[0052] Figure 4 A control route map of a mechanical property testing system of the present invention;

[0053] Figure 5 It is a schematic diagram of the cooperation between the cooling module and the in-situ high-temperature loading device in a mechanical property testing system of the present invention (the end cover leaves the cooling table base);

[0054] Figure 6 For Figure 5 A schematic diagram of adding an observation module on the basis of

[0055] Figure 7 It is a schematic diagram of the layout of the cooling space in the cooling module;

[0056] Figure 8 It is a schematic diagram of the cooperation between an in-situ high-temperature loading device, a cooling module and a micro-stretching module in a mechanical property testing system of the present invention.

[0057] Reference numerals:

[0058] 1-heating module; 2-insulation module; 3-limiting member; 4-accommodating cavity; 5-heat-conducting cylinder; 6-heating resistor wire; 7-sample material; 8-limiting groove; 9-observation hole; 10-cooling module; 11-observation module; 12-micro-stretching module; 13-main control module; 14-temperature sensor; 15-cooling pipeline; 16-cooling pipe; 17-cooling table base; 18-end cover; 19-cooling liquid inlet; 20-cooling liquid outlet; 21-cooling rod; 22-cooling plate. DETAILED DESCRIPTION

[0059] The present invention will be further described below in conjunction with specific embodiments:

[0060] like Figures 1 to 3 As shown, an in-situ high-temperature loading device described in this embodiment includes a heating module 1, a heat insulation module 2 and a limiter 3.

[0061] Among them, the thermal insulation module 2 is provided with a accommodating cavity 4 whose inner surface is paved with a thermal insulation layer and a limiting groove 8 located at the cavity mouth of the accommodating cavity 4; the heating module 1 includes a heat-conducting cylinder 5 and a heating resistance wire 6 connected to the circuit; the heat-conducting cylinder 5 is arranged in the accommodating cavity 4; the heating resistance wire 6 is wound around the outer surface of the heat-conducting cylinder 5; an observation hole 9 is provided in the middle of the limiting member 3, which passes through its upper and lower surfaces, and the limiting member 3 is installed at the cavity mouth of the accommodating cavity 4, and cooperates with the limiting groove 8 to limit the sample material 7 at the top of the heat-conducting cylinder 5.

[0062] In the above, the thermally conductive cylinder 5 is a silicon nitride thermally conductive cylinder 5, and the heating resistance wire 6 is wound on the outer surface of the silicon nitride thermally conductive cylinder 5. The heating resistance wire 6, which is energized and heated, uniformly heats the outer side surface of the silicon nitride thermally conductive cylinder 5, so that the top surface of the silicon nitride thermally conductive cylinder 5 in contact with the sample material 7 is uniformly heated, thereby not only providing a high temperature environment for the sample material 7, but also providing a uniform high temperature environment, thereby avoiding the influence of uneven temperature distribution on the results of the mechanical performance test.

[0063] The heating resistance wire 6 is made of iron-chromium-aluminum alloy, which has certain high temperature resistance, excellent stability and durability at high temperature. It can usually work stably in a high temperature environment of 800°C to 1400°C. It has excellent anti-oxidation performance. This allows the heating resistance wire 6 to be used in the air for a long time without surface oxidation and corrosion.

[0064] In addition, the heat-conducting cylinder 5 is disposed in the accommodating cavity 4, and the heat loss can be effectively isolated through the accommodating cavity 4. A heat-insulating layer is laid on the inner surface of the accommodating cavity 4, which can effectively isolate the heat source.

[0065] The limiting groove 8 cooperates with the limiting member 3 to limit the sample material 7, which can prevent the sample material 7 from shifting left and right and affecting subsequent observation; through the observation hole 9 of the limiting member 3, the microstructural changes of the sample material 7 in a high temperature environment can be observed.

[0066] Furthermore, this embodiment also provides a mechanical properties testing system, such as Figures 5 to 8 As shown, it includes the above-mentioned in-situ high-temperature loading device, a cooling module 10, an observation module 11 (optical microscope), a micro-stretching module 12 (existing) and a main control module 13 (computer);

[0067] The cooling module 10 is connected to the heating module 1; the micro-stretching module 12 is connected to the sample material 7 to apply a micro-stretching force to the sample material 7; the observation module 11 is arranged above the heating module 1 and faces the sample material 7; a temperature sensor 14 is installed on the inner wall of the accommodating cavity 4; the main control module 13 is respectively connected to the high-temperature loading device, the cooling module 10 and the temperature sensor 14.

[0068] In this embodiment, the temperature provided by the in-situ high-temperature loading device can be controlled by the main control module 13, and the in-situ high-temperature loading device and the cooling module 10 can be controlled by the main control module 13. The in-situ high-temperature loading device and the cooling module 10 cooperate to control the provided temperature. The cooling module 10 can also be controlled to work through the main control module 13 when the heating resistor wire 6 is not heated, thereby providing a lower temperature environment for the sample material 7.

[0069] Specifically, Figure 3 As shown, the heat insulation module 2 is provided with a cooling pipe 15 passing through the interior of the heat-conducting cylinder 5. The cooling pipe 15 is closely attached to the inner wall of the heat-conducting cylinder 5 and is in a "Π" shape, which can quickly transfer cold to the heat-conducting cylinder 5.

[0070] The cooling module 10 is connected to both ends of the cooling pipe 15 through the cooling pipe 16 to form a closed-loop coolant delivery channel. By forming a closed-loop coolant delivery channel, low-temperature coolant is continuously and cyclically injected into the cooling pipe 15, which can stably neutralize the heat generated and conducted by the heating resistance wire 6, achieve the purpose of cooling and temperature control, and also ensure that the equipment is not damaged by high temperature. In addition, when the heating resistance wire 6 is not heated, a low-temperature environment with a constant temperature can be provided for the sample material 7 alone.

[0071] Furthermore, in this embodiment, the cooling module 10 includes a cooling table base 17 and an end cover 18; the cooling table base 17 is provided with a cooling space, in which a cooling component, a coolant inlet 19 and a coolant outlet 20 are provided; the end cover 18 covers the cooling table base 17 to close the cooling space.

[0072] The cooling assembly includes a cooling rod 21 and a cooling plate 22; the cooling rod 21 is arranged in the middle of the cooling space, and the cooling plates 22 are arranged around the cooling rod 21; the coolant inlet 19 and the coolant outlet 20 are located on both sides of the cooling rod 21, and are respectively located between the cooling rod 21 and the corresponding cooling plate 22. Through the layout of the cooling rod 21, the cooling plate 22, the coolant inlet 19 and the coolant outlet 20 in the cooling space, the coolant entering the cooling space can be quickly cooled down to improve the cooling effect. In the above, the cooling rod 21 and the cooling plate 22 are matched with corresponding circuits, and the main control module 13 is connected to the corresponding circuits to control the cooling work of the cooling rod 21 and the cooling plate 22, which is an existing technology.

[0073] The working principle of the mechanical properties testing system is as follows:

[0074] Processing material to 20mm-60mm sample material 7;

[0075] The sample material 7 is placed on the heating module 1 and the sample material 7 is limited by the limiting member 3;

[0076] The micro-stretching module 12 is connected to both ends of the sample material 7;

[0077] The main control module 13 controls the circuit to be turned on, so that the heating resistor 6 is heated up, thereby uniformly heating the heat-conducting cylinder 5 and transferring the heat to the sample material 7;

[0078] The micro-stretching module 12 performs a micro-stretching operation on the sample material 7 , and observes the microstructure changes of the sample material 7 in real time through the observation module 11 .

[0079] In addition, the main control module 13 can also control the cooperation between the cooling module 10 and the high-temperature loading device, so as to control the temperature of the sample material 7 to reach the required temperature during the mechanical property test.

[0080] In the above, the main control module 13 controls the heating resistor 6 to heat up, driving the temperature of the silicon nitride heat-conducting cylinder 5 to rise, and the sample material 7 contacts the top of the silicon nitride heat-conducting cylinder 5 to achieve heating during contact. During the heating process, the temperature sensor 14 reads the outer surface temperature of the silicon nitride heat-conducting cylinder 5 in real time, and the main control module 13 reads the signal of the temperature sensor 14 through instructions. While the mechanical properties test is being conducted in the experiment, the different deformation microscopic appearances of the sample material 7 at different high temperatures are observed through an optical microscope.

[0081] In the above, the computer compares the read temperature with the temperature value set in the experiment. If it exceeds the set value, the main control module 13 can control the cooling module 10 and the high temperature loading device to cooperate to perform a small range of temperature reduction to stabilize near the set value, and use the PWM control method to stabilize the temperature. Figure 4shown.

[0082] PWM (Pulse Width Modulation) is a commonly used signal modulation technology, which is widely used in various electronic devices and systems. It controls the average power or voltage of the output signal by adjusting the pulse width of the signal. This control principle is applied to the temperature control of this invention, and the heating power and the circulating cooling system power are set to appropriate values ​​by using the PLC controller. Through the effective combination of the two, stable temperature control can be achieved.

[0083] At a certain frequency, different output temperatures can be obtained by using different duty cycles.

[0084] By combining the cooling module 10 and the high temperature loading device, when a lower temperature test is required, the circulating cooling system of the cooling module 10 can be used alone to perform a material mechanical property test at a low temperature. The combination of the two can generate a temperature between -10°C and 1200°C.

[0085] In this embodiment,

[0086] 1) The outer side surface of the heat-conducting cylinder 5 is uniformly heated by the heating resistor wire 6 after being energized and heated, so that the top surface of the heat-conducting cylinder 5 in contact with the sample material 7 is uniformly heated, thereby providing not only a high-temperature environment for the sample material 7, but also a uniform high-temperature environment, thereby avoiding the influence of uneven temperature distribution on the results of mechanical performance testing.

[0087] 2) In the mechanical properties testing system, the temperature provided by the in-situ high-temperature loading device can be controlled by the main control module 13, and the in-situ high-temperature loading device and the cooling module 10 can also be controlled by the main control module 13. The in-situ high-temperature loading device and the cooling module 10 cooperate to control the provided temperature. The cooling module 10 can also be controlled to work through the main control module 13 when the heating resistor wire 6 is not heated, thereby providing a lower temperature environment for the sample material 7.

[0088] 3) By forming a closed-loop coolant delivery channel, low-temperature coolant is continuously and cyclically injected into the cooling pipe 15, so that the heat generated and conducted by the heating resistance wire 6 can be stably neutralized to achieve the purpose of cooling and temperature control, and at the same time, the equipment can be ensured not to be damaged by high temperature. In addition, when the heating resistance wire 6 is not heated, a low-temperature environment with a constant temperature can be provided for the sample material 7 alone.

[0089] The embodiments described above are only preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. Therefore, all changes made according to the shape and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An in-situ high temperature loading device, characterized in that: It includes a heating module, a heat insulation module and a limiter; The thermal insulation module is provided with a containing cavity; The heating module includes a heat-conducting cylinder and a heating resistance wire connected to the circuit; The heat-conducting cylinder is disposed in the accommodating cavity; The heating resistance wire is wound around the outer surface of the heat-conducting cylinder; The limiting member is installed at the cavity opening of the accommodating cavity to limit the sample material at the top of the heat-conducting cylinder.

2. The in-situ high temperature loading device according to claim 1, characterized in that: The inner surface of the accommodating cavity is paved with a heat insulation layer.

3. The in-situ high temperature loading device according to claim 1, characterized in that: The thermal insulation module is provided with a limiting structure; The limiting structure cooperates with the limiting member to limit the position of the sample material; The limiting member is provided with an observation hole.

4. A mechanical properties testing system, characterized in that: It comprises the in-situ high-temperature loading device, cooling module, observation module, micro-stretching module and main control module as described in any one of claims 1 to 3; The cooling module is connected to the heating module; The micro-stretching module is connected to the sample material to impart micro-stretching force to the sample material; The observation module is arranged above the heating module and faces the sample material; A temperature sensor is installed on the inner side wall of the accommodating cavity; The main control module is connected to the high temperature loading device, the cooling module and the temperature sensor respectively.

5. A mechanical properties testing system according to claim 4, characterized in that: The heat insulation module is provided with a cooling pipe winding around the interior of the heat-conducting cylinder; The cooling module is connected to both ends of the cooling pipeline through cooling pipes to form a closed-loop cooling liquid delivery channel.

6. A mechanical properties testing system according to claim 5, characterized in that: The cooling pipe is closely attached to the inner wall of the heat-conducting cylinder and is in a "Π" shape.

7. A mechanical properties testing system according to claim 5, characterized in that: The cooling module includes a cooling platform base and an end cover; The cooling platform base is provided with a cooling space, in which a cooling component, a coolant inlet and a coolant outlet are arranged; The end cover is covered on the cooling platform base to close the cooling space.

8. A mechanical properties testing system according to claim 7, characterized in that: The cooling assembly includes a cooling rod and a cooling plate; The cooling rod is arranged in the middle of the cooling space, and the cooling plates are arranged around the cooling rod respectively; The cooling liquid inlet and the cooling liquid outlet are located on both sides of the cooling rod and are respectively located between the cooling rod and the corresponding cooling plate.

9. A mechanical properties testing method, characterized in that: The mechanical properties testing system according to claim 4 is used for implementation, comprising: The sample material is placed on the heating module and the sample material is limited by the limiting piece; The micro-tensile module is connected to both ends of the sample material; The main control module controls the circuit to make the heating resistor wire heat up, thereby uniformly heating the heat-conducting cylinder and transferring the heat to the sample material; The micro-stretching module performs micro-stretching operations on the sample material, and observes the microstructural changes of the sample material in real time through the observation module.

10. A mechanical properties testing method according to claim 9, characterized in that: It also includes controlling the cooperation of the cooling module and the high-temperature loading device through the main control module, so as to control the temperature required by the sample material during the mechanical property test.

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