Ultrahigh-temperature melting point testing equipment and method

Abstract

The invention relates to the technical field of ultrahigh-temperature ceramic material melting point testing, in particular to ultrahigh-temperature melting point testing equipment and method, and the ultrahigh-temperature melting point testing equipment comprises a vacuum system, a high-temperature generation system, a multi-channel high-temperature measurement system, a melting point calibration system and a control system; the vacuum system is responsible for providing a vacuum environment for the sample and avoiding the influence of the environment on a test result; the high-temperature generation system is responsible for emitting a laser beam to the surface of a sample to melt the sample, and can instantly generate a high temperature of thousands of DEG C to meet the test requirement of a high-melting-point material; the multi-channel high-temperature measuring system is responsible for recording a time-temperature curve in a sample melting process; the melting point calibration system is responsible for recording the melting state of the sample and is used for accurately calibrating the melting point of the sample in cooperation with the multi-channel high-temperature measurement system to overcome the influence of an intermediate medium on a measurement result; the problem that in the prior art, melting point testing equipment cannot accurately test the physical and chemical properties of ultra-high-temperature ceramics in a high-temperature environment exceeding 4000 K is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of melting point testing of ultra-high temperature ceramic materials, and specifically to an ultra-high temperature melting point testing device and method. Background Art

[0002] Hypersonic vehicles refer to vehicles that can fly at speeds exceeding Mach 5 (i.e., 5 times the speed of sound). Hypersonic vehicles are equipped with sharp nose tips and leading edges to maximize flight performance. During flight, hypersonic vehicles generate extremely high temperatures and heating rates due to intense friction and compression with the air. These high-temperature and high-speed airflows impose severe thermal loads and impacts on the vehicle's surface and structure. Especially at the hot-end components of the vehicle, such as engine blades, leading edges, etc., the temperature can exceed 2200K, which poses a great challenge to the heat resistance of materials and the design of thermal protection structures. The extreme conditions required for hypersonic applications have provided the impetus for the research and development of high-temperature materials, including a group of ceramics commonly known as ultra-high temperature ceramics (UHTCs). The common definition of UHTC is a ceramic with a melting temperature above 3300K. Among the numerous materials available to engineers, only a limited number of materials have melting temperatures above this standard. However, for new continuous solid-solution ultra-high temperature ceramics, in addition to predicting their extremely high melting points through calculations, their specific melting temperatures have not been accurately measured through experiments. Measurement methods and equipment often cannot work properly under such extreme conditions. Therefore, the main problems in ultra-high temperature melting point testing include the accuracy and stability of measurement in a high-temperature environment, as well as the high-temperature resistance requirements of the testing equipment.

[0003] To solve these problems, researchers have developed a variety of technologies and devices to improve the accuracy and stability of measurements. For example, a Chinese invention with the publication number CN115791868A discloses a method for determining the melting point and phase transition temperature of oxide ceramics based on laser heat source heating. An oxide ceramic raw material column is placed on the stage of a high-temperature phase transition measurement device, and then the light spots emitted by a laser radio frequency device and an infrared thermometer are aligned with the oxide ceramic raw material column. The laser radio frequency device is started to heat the oxide ceramic raw material column until it melts into a spherical shape. The laser radio frequency device is turned off, and then the infrared thermometer is used to continuously measure the temperature of the oxide ceramic raw material column to obtain the melting point and phase transition temperature of the oxide ceramic. This method can detect the melting point and phase transition temperature of oxide ceramics in the range of 350°C to 3500°C, achieving rapid and simple detection of the melting point and phase transition temperature of ultra-high temperature oxide ceramics. However, this method uses a laser radio frequency device to emit high-energy continuous laser as a high-temperature generator. However, the reflected light generated by the laser and the tested sample and the scattered light itself will seriously affect temperature measurement and calibration. At the same time, the melting point of the material often occurs instantaneously, which requires being able to quickly observe or detect the instantaneous process of material melting. However, the infrared thermometer is greatly affected by the absorption and scattering of the intermediate medium, and the measurement accuracy is prone to decline, making it impossible to accurately calibrate the melting point of ultra-high temperature materials. Therefore, the reliability of the test results is poor. In addition, the heating source of the test equipment in the prior art is difficult to achieve stable heating of ultra-high temperature ceramic materials at 4000K, and it cannot meet the testing of the physical and chemical properties of ultra-high temperature ceramics in a high-temperature environment exceeding 4000K required by the aerospace and national defense security fields. Summary of the Invention

[0004] Aiming at the problem that the existing melting point test equipment cannot accurately test the physical and chemical properties of ultra-high temperature ceramics in a high-temperature environment exceeding 4000K, the present invention provides an ultra-high temperature melting point test equipment and method.

[0005] To achieve the above object, the present invention adopts the following technical solutions: The present invention provides an ultra-high temperature melting point test equipment, including a vacuum system, a high-temperature generation system, a multi-channel high-temperature measurement system, a melting point calibration system, and a control system; A sample is placed in the vacuum system, which is used to provide a vacuum environment for the sample; The high-temperature generation system is used to emit a laser beam onto the surface of the sample to melt the sample; The multi-channel high-temperature measurement system is used to record the time-temperature curve during the melting process of the sample; The melting point calibration system is used to record the melting process of the sample; The vacuum system, the high-temperature generation system, the multi-channel high-temperature measurement system, and the melting point calibration system are all electrically connected to the control system.

[0006] Optionally, the energy of the laser beam emitted by the high-temperature generation system is 10 - 500 keV.

[0007] Optionally, the melting point calibration system is a high-speed camera, and the shutter speed of the high-speed camera is at the millisecond level.

[0008] Optionally, the vacuum system includes an ultra-high vacuum chamber, and the ultra-high vacuum chamber is connected to a vacuum pump.

[0009] Optionally, the material of the ultra-high vacuum chamber is 316L stainless steel, and a sandwich water cooling method is adopted to protect each interface from high-temperature erosion.

[0010] Optionally, it further includes an illumination system for illuminating the inside of the vacuum system, facilitating the melting process of the specimen to be recorded by the melting point calibration system.

[0011] Optionally, the spot of the laser beam is less than or equal to 1 / 15 of the surface area of the specimen.

[0012] Optionally, the high-temperature generation system is a pulsed laser emitter. The pulsed laser emitter has a wavelength of 400 - 1500 nm, a power of 3 - 15 kW, and the output power density of the pulsed laser emitter is 1×10 3 W / cm 2 or higher energy beam.

[0013] The present invention also provides a melting point testing method using the above ultra-high temperature melting point testing equipment, which is characterized by including: Placing the specimen in the vacuum system, evacuating the vacuum system, and filling it with an inert gas; Using the high-temperature generation system to emit a laser beam onto the surface of the specimen to melt the specimen; Using the multi-channel high-temperature measurement system to record the time-temperature curve during the melting process of the specimen; Using the melting point calibration system to record the melting process of the specimen; Fitting the time-temperature curve during the melting process of the specimen with the melting process of the specimen to obtain the temperature at the instant of the solid-liquid phase transition of the specimen, and obtaining the melting point of the specimen.

[0014] Optionally, the inert gas is argon and / or helium.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides an ultra-high temperature melting point testing device, which includes a vacuum system, a high-temperature generation system, a multi-channel high-temperature measurement system, a melting point calibration system, and a control system. Among them, the vacuum system is responsible for providing a vacuum environment for the specimen. The vacuum environment can isolate oxygen and impurities, avoid oxidation or chemical reactions of the specimen at high temperatures, ensure the authenticity of the melting point data, and at the same time can restrain the splashing of high-temperature molten materials. The focused heating method of the laser beam reduces the risk of heat diffusion. The high-temperature generation system is responsible for emitting a laser beam onto the surface of the specimen to melt the specimen. The high-energy laser beam serves as a heat source, which can instantly generate thousands of degrees Celsius of high temperature, meet the testing requirements of refractory materials, and break through the temperature limitation of traditional resistance heating. The multi-channel high-temperature measurement system is responsible for recording the time-temperature curve during the melting process of the specimen. This multi-channel high-temperature measurement system can calculate the temperature by analyzing the radiation energy at different wavelengths based on the principle of blackbody radiation. Compared with traditional infrared thermometers, it has a wide temperature measurement range, high accuracy, can identify local overheating or thermal gradients, strong fault tolerance, supports multi-modal joint analysis, etc., and is more suitable for transient phase change research. The melting point calibration system is responsible for recording the melting state of the specimen, which is used to cooperate with the multi-channel high-temperature measurement system to accurately calibrate the melting point of the specimen, cross-verify with the temperature curve, improve the reliability of the data, thereby overcoming the influence of intermediate media such as smoke, dust, and water vapor on the measurement results, accurately capturing the melting point phase change critical point, reducing the error of traditional single temperature measurement methods, and providing a visual basis for material phase change research. The control system is used to integrally control each system and receive the information fed back by each system, realizing the automatic adjustment of the heating rate, vacuum degree, and data acquisition, reducing human operation deviation, and improving the efficiency of repetitive testing. The device has a simple structure, can achieve full coverage of the melting point temperature range of the tested samples above 4000K, and has a series of advantages such as high efficiency, high accuracy, and fast temperature measurement.

[0016] The energy of the laser beam emitted by the high-temperature generation system is 10 - 500 KeV. When the high-energy laser beam bombards the surface of the specimen, kinetic energy is converted into heat energy, which has a higher energy density and is more suitable for heating materials with higher melting points.

[0017] The melting point calibration system includes a high-speed camera. The shutter speed of the high-speed camera is in the millisecond level. The millisecond-level shutter speed can accurately capture the transient changes on the surface of the specimen and is more suitable for capturing the ultra-fast melting process, further improving the accuracy of melting point calibration.

[0018] The vacuum system includes an ultra-high vacuum cavity, which provides a more stable vacuum environment for the test of the specimen, avoids the influence of the complexity of the external environment on the test accuracy of the specimen, and further improves the test accuracy of the melting point.

[0019] The spot of the laser beam is less than or equal to 1 / 15 of the surface area of the specimen, with more concentrated energy and can effectively avoid the influence of the thermal gradient effect at the edge of the laser spot on the temperature measurement result.

[0020] The present invention also provides a melting point testing method using the above ultra-high temperature melting point testing equipment. This method evacuates the vacuum system and fills it with inert gas to ensure the stability of the testing environment and avoid the influence of the testing environment on the testing result. Then, the high-temperature generating system emits a laser beam onto the surface of the specimen to instantaneously melt the specimen. At the same time, the multi-channel high-temperature measurement system records the time-temperature curve during the melting process of the specimen, and the melting point calibration system records the melting process of the specimen. By cross-verifying the time-temperature curve and the recorded melting process of the specimen, the melting point of the specimen can be accurately obtained. This method realizes the accurate measurement of the ultra-high temperature melting point above 4000K through vacuum-inert gas environment control, high-energy beam micro-area heating, and multi-modal data cross-verification, with fast testing efficiency and high accuracy. Description of the Drawings

[0021] Figure 1 It is a schematic structural diagram of an ultra-high temperature melting point testing equipment of the present invention.

[0022] Figure 2 It is a flowchart of an ultra-high temperature melting point testing method of the present invention.

[0023] Among them, 1 - vacuum system, 2 - melting point calibration system, 3 - crucible, 4 - specimen, 5 - lighting system, 6 - high-temperature generating system, 7 - control system, 8 - multi-channel high-temperature measurement system. Detailed Embodiments

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents the selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0026] It should be noted that: similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0027] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper", "lower", "horizontal", "inner", etc. are used to indicate the orientation or positional relationship, it is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the invention product is usually placed during use. This is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. In addition, terms such as "first", "second", etc. are only used for distinguishing descriptions and cannot be construed as indicating or implying relative importance.

[0028] In addition, if the term "horizontal" appears, it does not mean that the component is required to be absolutely horizontal, but it can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and it does not mean that the structure must be completely horizontal, but it can be slightly inclined.

[0029] In the description of the embodiments of the present invention, it should also be noted that unless otherwise clearly specified and limited, if terms such as "set", "installed", "connected", "connected" are used, they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0030] The following further elaborates on the present invention with specific embodiments, which is an explanation rather than a limitation of the present invention.

[0031] See Figure 1 , the present invention discloses an ultra-high temperature melting point test device, including a vacuum system 1, a high-temperature generation system 6, a multi-channel high-temperature measurement system 8, a melting point calibration system 2, an illumination system 5 and a control system 7; The vacuum system 1 internally contains a specimen 4 and is used to provide a vacuum environment for the specimen 4; preferably, the vacuum system 1 includes an ultra-high vacuum chamber, the ultra-high vacuum chamber is connected with a vacuum pump, the material of the vacuum chamber is 316L stainless steel, and the ultra-high vacuum chamber adopts an interlayer water-cooling method to protect each interface from high-temperature erosion.

[0032] The high-temperature generation system 6 is used to emit a laser beam onto the surface of the specimen 4 to melt the specimen 4. Preferably, the high-temperature generation system 6 is a pulsed laser emitter, and the pulsed laser emitter is a continuous laser with a wavelength of 400 - 1500 nm and a power of 3 - 15 kW. The output power density of the pulsed laser emitter is 1×10 3 W / cm 2The above energy beam, the energy of the laser beam is 10-500 keV; this high-temperature generation system has a high peak power, can quickly and accurately melt the target specimen 4, and has a short heating time, reducing the influence of the temperature of the material itself on the test during the heating process.

[0033] The multi-channel high-temperature measurement system 8 is used to record the time-temperature curve during the melting process of the specimen 4; preferably, the wavelength range of the multi-channel high-temperature measurement system 8 covers the ultraviolet, visible, and infrared wavelength bands of the laser beam to improve the detection accuracy. The temperature displayed at different wavelengths can be designed as the temperature measurement device during the high-temperature melting point measurement, and the multi-channel design ensures the temperature change of multiple light sources on the surface of the specimen.

[0034] The melting point calibration system 2 is used to record the melting process of the specimen 4 to verify the melting point temperature; preferably, the melting point calibration system 2 includes a high-speed camera, the shutter speed of the high-speed camera is at the millisecond level, and the high-speed camera can take pictures of the melting state on the surface of the specimen 4 to judge whether the material has melted, and the corresponding temperature is used as the melting point. Compared with direct observation, the result is more accurate.

[0035] The lighting system 5 is used to illuminate the inside of the vacuum system 1 to facilitate the melting point calibration system 2 to record the melting process of the specimen 4. Preferably, the lighting system 5 is a diode laser, which has the characteristics of good spectral purity, strong vacuum compatibility, and strong intelligent interaction, and can better assist the melting point calibration system 2 to record the melting process of the specimen 4. [[ID=X]] [[ID=X]]

[0036] The vacuum system 1, the high-temperature generation system 6, the multi-channel high-temperature measurement system 8, the lighting system 5, and the melting point calibration system 2 are all electrically connected to the control system 7.

[0037] See Figure 2 , the present invention also provides a melting point test method using the above ultra-high temperature melting point test equipment, including: S1: Place the specimen 4 in the vacuum system 1, evacuate the vacuum system 1, and fill it with an inert gas; preferably, the vacuum degree of evacuating the vacuum system 1 is 1-5 Pa; S2: Use the high-temperature generation system 6 to emit a laser beam onto the surface of the specimen 4 to melt the specimen 4; preferably, the spot of the laser beam is less than or equal to 1 / 15 of the surface area of the specimen 4, which can avoid the influence of the step thermal effect on the results of the multi-channel high-temperature measurement system 8; adopt a continuous stepwise increasing power and continuously irradiate the surface of the specimen 4 to be tested to generate the melting temperature required for the specimen 4; S3: Use the multi-channel high-temperature measurement system 8 to record the time-temperature curve during the melting process of the specimen 4; S4: Use the melting point calibration system 2 to record the melting process of the specimen 4; S5: Fit the time-temperature curve during the melting process of the specimen 4 with the melting process of the specimen 4 to obtain the temperature at the instant of the solid-liquid phase transition of the specimen 4 and acquire the melting point of the specimen 4.

[0038] See Figure 1 and Figure 2 During the melting point test, adjust the specimen 4 inside the crucible 3 within the laser spot emitted by the high-temperature generation system 6 and adjust the specimen 4 inside the crucible 3 within the temperature measurement spot emitted by the multi-channel high-temperature measurement system 8; the laser heating emitted by the high-temperature generation system 6 acts on the surface of the specimen 4, and the surface temperature of the specimen 4 rises and gradually melts downward. Under the irradiation condition of the illumination system 5, the multi-channel high-temperature measurement system 8 and the melting point calibration system 2 synchronously collect the morphological change images and the time-temperature curve during the melting process of the specimen 4, and the surface temperature of the specimen 4 is recorded in real time in the morphological change images during the melting process of the specimen 4; through the morphological change images during the melting process of the specimen 4, read the temperature range of the specimen 4 changing from solid state to liquid state in the time-temperature curve; find the mutation point within the temperature range of the experimental sample 4 changing from solid state to liquid state through the time-temperature curve of the specimen 4 as the melting point of the specimen 4, realizing the rapid and accurate measurement of the melting point of the specimen 4.

[0039] Example 1 Step 1: Use a hot pressing device to obtain a TaC ceramic block of 10×10×10 mm 3 and perform treatments such as 1000 mesh, 1500 mesh, 2500 mesh, and polishing on its surface in sequence to prepare the specimen 4 for measuring the melting point of the TaC ceramic block.

[0040] Step 2: Place the specimen 4 into the ultra-high vacuum cavity of the vacuum system 1, turn on the vacuum pump, pump the pressure of the ultra-high vacuum cavity to below 10 Pa, then turn off the vacuum pump, open the intake valve, fill with high-purity argon / helium to atmospheric pressure, and close the intake valve. Repeat this process several times to remove the oxygen in the cavity, and then pump the pressure of the ultra-high vacuum cavity to below 10 Pa again, then turn off the vacuum pump and maintain the high-vacuum state; Step 3: Turn on the multi-channel high-temperature measurement system 8, use a multi-channel pyrometer to measure the spectral emissivity and the true temperature during the experiment, and calibrate the spectral emission of the current specimen from 500 nm to 900 nm using a standard tungsten lamp strip and a blackbody; Step 4: Use a high-speed camera with a filter lens, i.e., the melting point calibration system 2, to record the melting process of the specimen 4 to be tested and record the state at the instant of the solid-liquid phase transition of the specimen 4 to be tested.

[0041] Step 5: Use a continuous laser, set the laser output power to 256 MW·m −2 and perform 3 pulsed heating on the specimen with a pulse duration of 1000 ms to rapidly heat up the surface of the specimen 4 to be tested.

[0042] Step 6: Fit and analyze the recorded temperature-time curve with the instantaneous melting process of Specimen 4 over the heating time to obtain the measured temperature at the instant of melting.

[0043] Example 2 Step 1: Use a plasma sintering equipment to obtain a 10×10×10 mm 3 HfC ceramic block, and successively process its surface with 1000-mesh, 1500-mesh, 2500-mesh and polishing treatments to prepare Specimen 4 for measuring the melting point of the HfC ceramic block.

[0044] Step 2: Place Specimen 4 into the ultra-high vacuum chamber of the vacuum system 1, turn on the vacuum pump, pump the pressure of the ultra-high vacuum chamber to below 5 Pa, then turn off the vacuum pump, open the intake valve, fill high-purity argon / helium to atmospheric pressure, and close the intake valve. Repeat this process several times to remove the oxygen in the chamber, and then pump the pressure of the ultra-high vacuum chamber to below 5 Pa again, then turn off the vacuum pump and maintain a high-vacuum state; Step 3: Turn on the multi-channel high-temperature measurement system 8, use a multi-channel pyrometer to measure the spectral emissivity and true temperature during the experiment, and calibrate the spectral emission of the current specimen from 500 nm to 900 nm using a standard tungsten lamp strip and a blackbody. Step 4: Use a high-speed camera with a filter lens, i.e., the melting point calibration system 2, to record the melting process of the tested Specimen 4 and record the instantaneous state of the solid-liquid phase transition of the tested sample.

[0045] Step 5: Use a continuous laser, set the laser output power to 300 MW·m −2 , and perform 4 pulsed heating on the specimen with a pulse duration of 1000 ms to rapidly heat up the surface of the tested Specimen 4.

[0046] Step 6: Fit and analyze the recorded temperature-time curve with the instantaneous melting process of the tested sample over the heating time to obtain the measured temperature at the instant of melting.

[0047] Example 3 Step 1: Use a plasma sintering equipment to obtain a 10×10×10 mm 3 ZrC ceramic block, and successively process its surface with 1000-mesh, 1500-mesh, 2500-mesh and polishing treatments to prepare Specimen 4 for measuring the melting point of the ZrC ceramic block.

[0048] Step 2: Place the specimen 4 into the ultra-high vacuum chamber of the vacuum system 1. Turn on the vacuum pump and pump the pressure of the ultra-high vacuum chamber to below 5 Pa. Then turn off the vacuum pump, open the intake valve, fill it with high-purity argon / helium to atmospheric pressure, and then close the intake valve. Repeat this process several times to remove the oxygen in the chamber. After that, pump the pressure of the ultra-high vacuum chamber to below 5 Pa again, then turn off the vacuum pump and maintain a high-vacuum state; Step 3: Turn on the multi-channel high-temperature measurement system 8. Use a multi-channel pyrometer to measure the spectral emissivity and true temperature during the experiment, and calibrate the spectral emission of the current specimen from 500 nm to 900 nm using a standard tungsten lamp strip and a blackbody; Step 4: Use a high-speed camera with a filter lens, i.e., the melting point calibration system 2, to record the melting process of the tested specimen 4 and record the instantaneous state of the solid-liquid phase transition of the tested sample.

[0049] Step 5: Turn on the continuous laser and set the laser output power to 250 MW·m −2 Use pulses with a duration of approximately 1000 ms to perform 4 pulsed heating operations on the specimen, and rapidly heat up the surface of the tested specimen 4.

[0050] Step 6: Perform fitting analysis on the recorded temperature-time change curve and the instantaneous melting process of the tested sample with the heating time to obtain the measured temperature at the instant of melting.

[0051] In summary, the present invention provides an ultra-high temperature melting point testing device and method. Through the settings of a vacuum system, a high-temperature generation system, a multi-channel high-temperature measurement system, a melting point calibration system, and a control system, a stable vacuum environment is provided for the determination of the specimen 4 to be tested, the specimen 4 melts instantaneously, the time-temperature curve during the melting process of the specimen 4 is recorded, the melting process is recorded, and the melting point is cross-verified. The melting point of the specimen is accurately obtained, that is, through vacuum-inert gas environment control, high-energy beam micro-area heating, and multi-modal data cross-verification, the accurate measurement of ultra-high temperature melting points above 4000 K is achieved, with fast testing efficiency and high accuracy.

[0052] The above are only the preferred embodiments of the present invention and are not used to limit the technical solutions of the present invention in any way. Those skilled in the art should understand that without departing from the spirit and principles of the present invention, the technical solutions can be modified and replaced in several simple ways, and these modifications and replacements also fall within the protection scope covered by the claims.

Claims

1. An ultra-high temperature melting point testing device, characterized in that, It includes a vacuum system (1), a high-temperature generation system (6), a multi-channel high-temperature measurement system (8), a melting point calibration system (2), and a control system (7); A specimen (4) is placed inside the vacuum system (1) to provide a vacuum environment for the specimen (4); The high-temperature generation system (6) is used to emit a laser beam onto the surface of the specimen (4) to melt the specimen (4); The multi-channel high-temperature measurement system (8) is used to record the time-temperature curve during the melting process of the specimen (4); The melting point calibration system (2) is used to record the melting process of the specimen (4); The vacuum system (1), the high-temperature generation system (6), the multi-channel high-temperature measurement system (8), and the melting point calibration system (2) are all electrically connected to the control system (7).

2. The ultra-high temperature melting point testing device according to claim 1, wherein The energy of the laser beam emitted by the high-temperature generation system (6) is 10 - 500 KeV.

3. The ultra-high temperature melting point testing device according to claim 1, characterized in that, The melting point calibration system (2) is a high-speed camera, and the shutter speed of the high-speed camera is at the millisecond level.

4. The ultra-high temperature melting point testing device according to claim 1, characterized in that, The vacuum system (1) includes an ultra-high vacuum chamber, and the ultra-high vacuum chamber is connected to a vacuum pump.

5. An ultra-high temperature melting point testing device according to claim 4, characterized in that, The material of the ultra-high vacuum chamber is 316L stainless steel, and a sandwich water cooling method is adopted to protect each interface from high-temperature erosion.

6. The ultra-high temperature melting point testing device according to claim 1, characterized in that, It further includes an illumination system (5) for illuminating the inside of the vacuum system (1) to facilitate the melting point calibration system (2) to record the melting process of the specimen (4).

7. The ultra-high temperature melting point testing device according to claim 1, wherein The spot of the laser beam is less than or equal to 1 / 15 of the surface area of the specimen (4).

8. An ultra-high temperature melting point testing device according to claim 1, characterized in that, The high-temperature generation system (6) is a pulsed laser emitter, and the pulsed laser emitter has a wavelength of 400 to 1500 nm and a power of 3 to 15 kW. The output power density of the pulsed laser emitter is 1×10 3 W / cm 2 or more energy beam.

9. A melting point testing method using the ultra-high temperature melting point testing device according to any one of claims 1-8, characterized in that, It includes: Place the specimen (4) in the vacuum system (1), evacuate the vacuum system (1), and fill it with an inert gas; Use the high-temperature generation system (6) to emit a laser beam onto the surface of the specimen (4) to melt the specimen (4); Use the multi-channel high-temperature measurement system (8) to record the time-temperature curve during the melting process of the specimen (4); Use the melting point calibration system (2) to record the melting process of the specimen (4); Fit the time-temperature curve during the melting process of the specimen (4) with the melting process of the specimen (4) to obtain the temperature at the instant of the solid-liquid phase transition of the specimen (4) and obtain the melting point of the specimen (4).

10. The ultra-high temperature melting point test method according to claim 9, characterized in that, The inert gas is argon and / or helium.

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