Inert gas micro-positive pressure compensation type graphene film heat dissipation performance test system and method

Abstract

The application discloses a kind of inert gas micro-positive pressure compensation formula graphene film heat dissipation performance test system and method, the system includes heat preservation platform and inert gas micro-positive pressure system;At least one heat source is equipped in the heat preservation platform, the heat source is connected with constant power supply, the output of constant power supply is controlled, the heating power of heat source is kept constant, temperature sensor is equipped on the heat source, for detecting the temperature of heat source, the upper surface of the heat source is used to place the material to be measured;The inert gas micro-positive pressure system is set to the outside of heat preservation platform, for guaranteeing that the pressure, temperature and humidity of test environment are constant.The application realizes the synchronous test and comparison to the heat dissipation performance of graphene film by using heat preservation platform, constant power heat source and precision temperature sensor in inert gas micro-positive pressure environment.

Description

Technical Field

[0001] This invention relates to the field of information technology, and in particular to an inert gas micro-positive pressure compensated graphene film heat dissipation performance testing system and method. Background Technology

[0002] Efficient heat dissipation has always been a prominent issue in the rapid development of electronic devices since their invention, and it remains a mainstream research direction in modern heat transfer technology. As high-power products increasingly demand higher performance, portability, and integration, the heat generated per unit area of ​​devices increases rapidly. The primary purpose of thermal management is to quickly transfer heat away from these devices to prevent overheating and damage. On the one hand, hotspots in electronic products have much higher heat flux than other areas, requiring heat dissipation materials with high lateral thermal conductivity. On the other hand, the emergence of portable and wearable devices necessitates flexible or transparent heat dissipation materials. Traditional metal heat dissipation materials such as copper and aluminum are no longer sufficient to meet the heat dissipation needs of electronic products. Finding heat dissipation materials with higher thermal conductivity, flexibility, and low cost has become an urgent need for the next generation of high-power devices and electronic products.

[0003] Graphene, a two-dimensional sp2 hybridized monolayer carbon atom crystal, has attracted widespread interest from the scientific and industrial communities due to its excellent mechanical, optical, electronic, and thermal properties. Its high thermal conductivity and other superior properties make graphene a highly promising next-generation material for heat dissipation and thermal management.

[0004] During the preparation and transfer of graphene materials, when they are integrated into electronic or optoelectronic devices, and in some applications with extremely high requirements for long-term stability, such as aerospace and military fields, graphene devices need to be used in an inert environment to avoid performance degradation over time and ensure long-term device stability.

[0005] However, evaluating the heat dissipation performance of materials is a complex and critical task, involving multiple technical challenges.

[0006] The primary challenge is ensuring precise control and stability of test conditions while simulating real-world application environments. Traditional methods often struggle to meet both requirements simultaneously, casting doubt on the accuracy and repeatability of test results. Secondly, precise control of the heat source is another critical issue. Fluctuations in heat source power directly impact test reliability, and current technologies have limitations in maintaining constant power output over extended periods. Ensuring the accuracy of temperature sensor measurements is also a challenge, particularly in multi-point temperature measurement and long-term monitoring. Eliminating instrumental interference and guaranteeing data consistency are all urgent problems to be solved. Summary of the Invention

[0007] The purpose of this invention is to address the problem of measuring the heat dissipation performance of graphene high thermal conductivity films when used in an inert environment. It proposes an inert gas micro-positive pressure compensated graphene film heat dissipation performance testing system and method, which can measure the thermal conductivity and heat dissipation performance of graphene high thermal conductivity films.

[0008] The technical solution of this invention is:

[0009] This invention provides an inert gas micro-positive pressure compensated graphene film heat dissipation performance testing system, comprising:

[0010] The heat preservation platform is equipped with at least one heat source, which is connected to a constant power supply. By controlling the output of the constant power supply, the heating power of the heat source is kept constant. The heat source is equipped with a temperature sensor to detect the temperature of the heat source. The upper surface of the heat source is used to place the material to be tested.

[0011] An inert gas micro-positive pressure system is installed outside the insulation platform to ensure that the pressure, temperature and humidity of the test environment are constant. The inert gas micro-positive pressure system is a closed cavity filled with dry and clean inert gas, and the internal pressure is maintained in the range of 1 to 5 kPa.

[0012] Furthermore, a groove is formed in the middle of the insulation platform, the heat source is embedded in the groove, and the upper surface of the heat source is flush with the upper surface of the insulation platform.

[0013] Furthermore, the inert gas is argon, and the pressure inside the cavity is maintained within the range of 1–5 kPa by the following steps:

[0014] High-purity argon gas was obtained by measuring its purity using a gas purity analyzer and adjusting the parameters of the gas supply device based on the purity data to obtain argon gas with a purity of 99.999%.

[0015] Specifically, the process involves: obtaining initial argon gas using an argon source, measuring the analytical value of the initial argon gas using a purity meter, comparing the analytical value with the target value, and if the analytical value is lower than the target value, obtaining the adjustment amount of the supply from the parameter table, controlling the gas flow based on the adjustment amount, adjusting the argon gas parameters through the supply, and measuring the analytical value of the adjusted argon gas again. If the analytical value reaches the target value, high-purity argon gas is obtained.

[0016] The argon gas is purified using a multi-stage filtration system, which includes a molecular sieve adsorber, a catalytic oxidation unit, a condensation and dehumidification module, and a particulate trap connected in sequence. Moisture is removed by the molecular sieve adsorber, oxygen is removed by the catalytic oxidation unit, the condensation and dehumidification module further dehydrates the gas, and submicron particles are removed by the particulate trap.

[0017] Obtain the parameters of the purified argon gas, and adjust the opening of the inlet pressure regulating valve of the sealed test chamber according to the parameters of the purified argon gas; obtain the feedback data of the pressure sensor, and adjust the inflation rate in real time according to the feedback data until the pressure in the chamber is maintained at a slightly positive pressure value within a preset range, wherein the preset range is 1 to 5 kPa.

[0018] Furthermore, the heat source uses a ceramic heating element MCH, and the constant power supply is equipped with a thermal balance compensation unit, employing a PID feedback algorithm to control the constant power output, specifically including:

[0019] The real-time temperature of the ceramic heating element MCH is obtained, and the real-time resistance of the ceramic heating element MCH is obtained through a pre-acquired temperature-resistance model.

[0020] Based on the output voltage of the constant power supply and the real-time resistance of the ceramic heating element MCH, the real-time power is obtained through the power calculation formula P=U² / R, where P represents the real-time power, U represents the power supply output voltage, and R represents the real-time resistance of the ceramic heating element MCH.

[0021] The difference between the real-time power and the set power is determined. If the difference is within the preset threshold range, the constant power supply maintains its current output. If the difference between the real-time power and the set power exceeds the preset threshold range, the direction of the adjustment signal is determined according to the direction of the difference.

[0022] By adjusting the signal direction and the magnitude of the difference, the constant power supply output voltage is obtained. This process is repeated to maintain the heating power of the ceramic heating element MCH, i.e., the real-time power P, constant.

[0023] A testing method for an inert gas micro-positive pressure compensated graphene film heat dissipation performance testing system, comprising the following steps:

[0024] The ceramic heating element MCH was selected as the heat source for encapsulation.

[0025] In an inert gas micro-positive pressure system, the material to be tested is placed on the upper surface of the heat source of the insulation platform, and multiple temperature measuring points are configured.

[0026] Adjust the output of the constant power supply to make the temperature of the heat source reach the corresponding temperature measurement point, and record the curve of the heat source temperature measured by the temperature sensor changing over time.

[0027] By iterating through all temperature measurement points, the curves showing the change in the measured temperature of the heat source at each point over time are summarized as test results, which are used to evaluate the heat dissipation performance of the tested material.

[0028] Furthermore, based on the known thermal conductivity data of the material being tested, a relationship between thermal conductivity and the curves showing the change of measurement temperature over time is established.

[0029] Furthermore, the temperature sensor is calibrated using a high-grade temperature standard with an uncertainty better than 1 / 3 of its own, and a correction value is obtained every 10°C in the range of 0 to 350°C to compensate for the accuracy of the temperature sensor.

[0030] Furthermore, multiple temperature data points at 10°C intervals are obtained from the standard within the range of 0–350°C to establish a standard temperature data sequence;

[0031] The temperature sensor to be calibrated and the standard are placed in the same temperature field. The temperature points of the standard temperature data sequence are synchronously measured on the temperature sensor to be calibrated. If the absolute value of the difference between the synchronously measured temperature value and the standard temperature value is greater than the preset threshold, the error is calculated to obtain the original error data set of the corresponding temperature point.

[0032] The least squares method is used to fit the original error data set to obtain the sensor system error curve. A temperature compensation data table is generated based on the system error curve, and the temperature value and the corresponding compensation value are recorded.

[0033] Obtain the real-time measured temperature value of the temperature sensor to be calibrated, determine the temperature range to which the real-time measured temperature value belongs, and calculate the compensation value corresponding to the real-time measured temperature value using linear interpolation based on the temperature compensation data table.

[0034] Furthermore, the real-time measured temperature value is added to the corresponding compensation value. If the result is greater than 350℃, an over-range alarm is triggered and transmitted to the display module.

[0035] Furthermore, multiple heat sources are set up in the inert gas micro-positive pressure system, and various test materials are placed on the corresponding heat source surface of the insulation platform.

[0036] Multiple identical temperature measurement points were configured for each material under test. The test was performed, and the change curve of the heat source measurement temperature of each material under test over time was recorded. At the same time, the heat dissipation performance of multiple materials under test was compared.

[0037] The beneficial effects of this invention are:

[0038] This invention discloses an inert gas micro-positive pressure compensated graphene film heat dissipation performance testing system and method. By using an inert gas micro-positive pressure environment, a heat preservation platform, a constant power heat source and a precision temperature sensor, the heat dissipation performance of graphene films can be tested and compared simultaneously.

[0039] The testing system of this invention addresses the complex scenarios requiring precise control of argon purity and accurate adjustment of chamber pressure by employing a multi-stage filtration system for deep purification. This multi-stage filtration system includes a molecular sieve adsorber, a catalytic oxidation unit, a condensation and dehumidification module, and a particulate trap, effectively removing moisture, oxygen, and particulate matter. After purification, this invention utilizes pressure sensor feedback data to automatically adjust the inlet valve opening and inflation rate, precisely controlling the chamber pressure within a slightly positive pressure range of 1-5 kPa, ensuring a stable testing environment. This integrated solution significantly improves argon purity and pressure control accuracy, providing reliable assurance for precision processes requiring a high-purity inert gas environment, and possesses significant industrial application value.

[0040] In this invention, a ceramic heating element is used as the heat source. By precisely controlling the heating power of the heat source and combining high-precision temperature measurement and compensation technology, the heating power of the heat source is monitored and adjusted in real time to maintain a constant heating power. This enables an accurate evaluation of the heat dissipation performance of the tested material and improves the measurement accuracy. At the same time, a calibrated temperature sensor is used to record temperature change curves at multiple temperature measurement points, and an evaluation model is established based on known thermal conductivity data.

[0041] The testing system and method of this invention also support the simultaneous testing of multiple materials, improving testing efficiency. They significantly enhance the accuracy and reliability of material heat dissipation performance evaluation, providing crucial support for related research and product development.

[0042] Other features and advantages of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0043] The above and other objects, features and advantages of the present invention will become more apparent from the more detailed description of exemplary embodiments of the invention in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the invention.

[0044] Figure 1 A schematic diagram of a test apparatus according to an embodiment of the present invention is shown. Detailed Implementation

[0045] Preferred embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While preferred embodiments of the invention are shown in the drawings, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Example 1

[0046] Figure 1 A schematic diagram of a test apparatus according to an embodiment of the present invention is shown.

[0047] like Figure 1The inert gas micro-positive pressure compensated graphene film heat dissipation performance testing system provided by the present invention specifically includes: a heat preservation platform 1, wherein at least one heat source 2 is provided in the heat preservation platform 1, the heat source 2 is connected to a constant power supply 3, and the heat dissipation power of the heat source 2 is kept constant by controlling the output of the constant power supply 3; a temperature sensor 4 is provided on the heat source 2 for detecting the temperature of the heat source 2; and the upper surface of the heat source 2 is used to place the material to be tested 5.

[0048] An inert gas micro-positive pressure system is installed outside the insulation platform 1 to ensure that the pressure, temperature and humidity of the test environment are constant. The inert gas micro-positive pressure system is a closed cavity filled with dry and clean inert gas, and the internal pressure is maintained in the range of 1 to 5 kPa.

[0049] In this embodiment, the thermal insulation platform 1 is one of the key components of the measurement system, and its main function is to provide a stable thermal environment for the material being tested. The inert gas micro-positive pressure system is located outside the thermal insulation platform and mainly serves to maintain a constant pressure, temperature, and humidity in the test environment. This system maintains the pressure inside the chamber within the range of 1–5 kPa by filling the sealed chamber with dry and clean inert gas.

[0050] In this embodiment, argon is used as the inert gas. The purity of the argon is measured using a gas purity analyzer. Based on the purity data, the parameters of the gas supply device are adjusted to obtain argon with a purity of 99.999%. Specifically, initial argon is obtained using an argon source. The analytical value of the initial argon is measured using a purity analyzer. The analytical value is compared with the target value. If the analytical value is lower than the target value, the adjustment amount of the supply device is obtained from the parameter table. The gas flow is controlled according to the adjustment amount, and the argon parameters are adjusted through the supply device. The analytical value of the adjusted argon is measured again. If the analytical value reaches the target value, high-purity argon is obtained.

[0051] The argon gas is purified using a multi-stage filtration system. This system includes a molecular sieve adsorber, a catalytic oxidation unit, a condensation and dehumidification module, and a particulate trap, connected sequentially. Moisture is removed by the molecular sieve adsorber, oxygen is removed by the catalytic oxidation unit, further dehydration is achieved by the condensation and dehumidification module, and submicron particles are removed by the particulate trap. If the concentration of submicron particles in the gas exceeds a preset threshold, the particulate trap treatment step is repeated. The adsorption parameters of the molecular sieve adsorber are adjusted based on the moisture content of the gas. The oxidation parameters of the catalytic oxidation unit are adjusted based on the oxygen content of the gas.

[0052] Obtain the parameters of the purified argon gas, and adjust the opening of the inlet pressure regulating valve of the sealed test chamber according to the parameters of the purified argon gas; obtain the feedback data of the pressure sensor, and adjust the inflation rate in real time according to the feedback data until the pressure in the chamber is maintained at a slightly positive pressure value within the preset range.

[0053] The pressure inside the cavity is controlled within a slightly positive pressure range of 1–5 kPa. On the one hand, a suitable positive pressure environment helps to inhibit the infiltration of outside air into the cavity and prevent the introduction of impurities; on the other hand, excessive pressure will lead to increased thermal convection within the cavity, which is not conducive to heat conduction. Maintaining a slightly positive pressure of 1–5 kPa balances the needs of preventing the infiltration of outside air and inhibiting thermal convection.

[0054] The pressure inside the chamber is monitored in real time by a pressure sensor. When the pressure deviates from the set range, it is adjusted by controlling the filling and releasing of gas to maintain it within a reasonable range.

[0055] The inert gas micro-positive pressure system, by filling a sealed cavity with filtered inert gas and precisely controlling the cavity pressure, ensures the cleanliness of the testing environment while suppressing heat convection and reducing heat loss, thus providing favorable environmental conditions for the accurate measurement of the thermal conductivity of materials.

[0056] In one example, the heat source 2 uses a ceramic heating element MCH, and the constant power supply 3 is equipped with a thermal balance compensation unit, employing a PID feedback algorithm to control the constant power output, specifically including:

[0057] The real-time temperature of the ceramic heating element MCH is obtained, and the real-time resistance of the ceramic heating element MCH is obtained through a pre-acquired temperature-resistance model.

[0058] Based on the output voltage of the constant power supply 3 and the real-time resistance of the ceramic heating element MCH, the real-time power is obtained through the power calculation formula P=U² / R, where P represents the real-time power, U represents the power supply output voltage, and R represents the real-time resistance of the ceramic heating element MCH.

[0059] Determine the difference between the real-time power and the set power. If the difference is within the preset threshold range, the constant power supply (3) maintains its current output. If the difference between the real-time power and the set power exceeds the preset threshold range, determine the direction of the adjustment signal based on the direction of the difference.

[0060] By adjusting the signal direction and the magnitude of the difference, the constant power supply (3) is adjusted to obtain the adjusted power supply output voltage. The operation is repeated to keep the heating power of the ceramic heating element MCH, i.e., the real-time power P, constant.

[0061] In this embodiment, the control system converts the temperature signal into a corresponding real-time resistance value based on a pre-acquired temperature-resistance model, thus realizing the conversion from temperature to resistance. After obtaining the real-time resistance value of the heating element MCH, and combining it with the output voltage of the constant power supply, the real-time power of the heating element can be obtained using the power calculation formula P=U² / R, and compensation can be performed.

[0062] Real-time power monitoring is crucial for maintaining a constant power output from the heating element. The control system needs to compare the real-time power with a preset target power to determine if the difference is within an acceptable range. If the difference is small and within the threshold range, the current constant power supply output is appropriate and can be maintained. However, if the difference exceeds the preset threshold range, the constant power supply output needs to be adjusted accordingly to bring the real-time power back to the target value as quickly as possible.

[0063] The control system adjusts the output voltage of the constant power supply according to the adjustment direction and magnitude. After the voltage adjustment, the real-time power of the heating element also changes. The control system recalculates and compares the changes, forming a closed-loop control, which iterates continuously until the real-time power stabilizes at the target value, thus keeping the heating power of the ceramic heating element MCH constant at the set value. This method overcomes the power fluctuations caused by changes in the heating element resistance with temperature, providing a stable heat source during the measurement process and providing reliable conditions for accurate evaluation of the material's heat dissipation performance. Furthermore, due to the use of closed-loop control, the system has good adaptability and robustness, and can cope with a certain degree of external interference. Example 2

[0064] This invention provides a testing method for an inert gas micro-positive pressure compensated graphene film heat dissipation performance testing system, the method comprising the following steps:

[0065] Ceramic heating element MCH was selected as heat source 2 for encapsulation;

[0066] In the inert gas micro-positive pressure system, the material to be tested 5 is placed on the upper surface of the heat source 2 of the heat insulation platform 1, and multiple temperature measuring points are configured.

[0067] Adjust the output of constant power supply 3 so that the temperature of heat source 2 reaches the corresponding temperature measurement point, and record the curve of the change of heat source measured temperature over time obtained by temperature sensor 4.

[0068] By iterating through all temperature measurement points, the curves showing the change in the measured temperature of the heat source at each temperature measurement point over time are summarized as test results, which are used to evaluate the heat dissipation performance of the tested material 5.

[0069] In this embodiment, the ceramic heating element MCH has the characteristics of low thermal conductivity, large heat capacity, and small coefficient of thermal expansion, making it suitable as a heat source for heat dissipation performance testing. During the test, the material under test is placed flat on the upper surface of the heat source, and an inert gas is filled into the test chamber using a micro-positive pressure system to suppress the influence of convective heat transfer. By adjusting the output power of the constant power supply, the temperature change of the heat source is controlled, and the temperature change curves of each measuring point over time are recorded.

[0070] During testing, the output power of the constant power supply must remain stable to avoid fluctuations. Summarizing and analyzing the temperature change curves at each measuring point can be used to evaluate the thermal conductivity of the tested material. For standard materials with known thermal conductivity, the correlation between their thermal conductivity and temperature change curves can be established through testing, providing a reference for subsequent testing of unknown materials.

[0071] In actual testing, to ensure the accuracy of test results, the temperature sensor needs to be calibrated regularly using a high-grade temperature standard.

[0072] During calibration, the temperature sensor and temperature standard are placed in a constant temperature bath. Within the range of 0 to 350 degrees Celsius, a calibration point is tested every 10 degrees Celsius to obtain the deviation between the sensor reading and the standard value, generating a temperature correction curve. In subsequent tests, the sensor's measurement results are corrected based on this calibration curve, effectively improving measurement accuracy.

[0073] Specifically, multiple temperature data points of the standard instrument are obtained at intervals of 10°C within the range of 0 to 350°C, and a standard temperature data sequence is established.

[0074] A high-precision platinum resistance thermometer was used as a standard, placed in a constant temperature bath at 0℃, 10℃, and 20℃. After the temperature stabilized, the resistance value of the platinum resistance thermometer was read. Based on the correspondence between resistance value and temperature, an accurate standard temperature value was calculated. By acquiring a data point every 10℃, a standard temperature data sequence containing 36 data points was finally established, serving as the benchmark for subsequent calibration work.

[0075] The temperature sensor to be calibrated and the standard are placed in the same temperature field, and the temperature points of the temperature sensor to be calibrated are measured synchronously according to the temperature data sequence of the standard. At each temperature point, the values ​​of the standard thermometer and the sensor to be calibrated are read simultaneously, and the deviation between the two is calculated. If the absolute value of the deviation exceeds a preset threshold (e.g., 0.5℃), the sensor is considered to have an error at that temperature point, and the difference between the actual measured value and the standard value is recorded to form the original error data for that temperature point.

[0076] By repeating the above process at different temperatures, a set of raw error data covering the 0-350℃ range can be obtained. The raw error data set is then fitted using the least squares method to obtain the sensor system error curve. A temperature compensation data table is generated based on the system error curve, recording the temperature values ​​and corresponding compensation values. Based on the system error curve, for each temperature value within the 0-350℃ range, the corresponding compensation value can be calculated, generating a lookup table to offset the system error and improve measurement accuracy.

[0077] The process involves acquiring the real-time measured temperature value from the temperature sensor to be calibrated, determining the temperature range to which the real-time measured temperature value belongs, calculating the corresponding compensation value for the real-time measured temperature value using linear interpolation based on the temperature compensation data table, and adding the compensation value to the measured value to obtain the calibrated temperature result. If the calibrated result exceeds the sensor's range of 350℃, an over-range alarm must be triggered and transmitted to the display terminal to ensure safety.

[0078] In one example, multiple heat sources 2 are set up in an inert gas micro-positive pressure system, and various test materials 5 are placed on the upper surface of the corresponding heat source 2 of the insulation platform 1.

[0079] Multiple identical temperature measurement points were configured for each tested material 5, and the test was performed. The temperature change curve of the heat source of each tested material 5 over time was recorded, and the heat dissipation performance of multiple tested materials 5 was compared.

[0080] In this embodiment, multiple heat sources are set up within the inert gas micro-positive pressure system, enabling simultaneous testing of various materials and improving testing efficiency. The heat sources are evenly distributed on the insulation platform, and the material under test is placed directly on the upper surface of the corresponding heat source, ensuring full contact between the heat source and the material under test, which facilitates efficient heat transfer to the material.

[0081] For each type of material being tested, multiple locations on its surface are selected as temperature measurement points. The temperature measurement points should be distributed as evenly as possible. Selecting the same temperature measurement points for all tested materials facilitates comparison of the differences in heat dissipation performance between different materials.

[0082] During the test, the temperature data of each measuring point was recorded over time, and a temperature-time curve was plotted. By comparing the rate of change of the temperature curves of different materials, i.e., the magnitude of the slope of the change, their heat dissipation performance can be compared intuitively.

[0083] The above description is merely a preferred embodiment of one or more embodiments of this specification and is not intended to limit the scope of one or more embodiments of this specification. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of one or more embodiments of this specification should be included within the protection scope of one or more embodiments of this specification.

Claims

1. A graphene film heat dissipation performance test system with inert gas micro-positive pressure compensation, characterized in that, The application relates to a heat preservation platform (1) which is internally provided with at least one heat source (2) connected with a constant-power power supply (3), the heat preservation platform (1) is used for placing a measured material (5) on the upper surface of the heat source (2), the heat preservation platform (1) is externally provided with an inert gas micro-positive pressure system which is used for keeping the pressure, temperature and humidity of a test environment constant, the inert gas micro-positive pressure system is filled with dry and clean inert gas in a closed cavity, and the internal pressure of the cavity is kept in the range of 1-5 kPa, the inert gas is argon, and the internal pressure of the cavity is kept in the range of 1-5 kPa by the following steps: obtaining high-purity argon, measuring the purity of the argon by using a gas purity analyzer, adjusting the parameters of a gas supply device according to the purity data to obtain argon with a purity of 99.999%, purifying the argon by using a multi-stage filtering system, the multi-stage filtering system comprises a molecular sieve adsorber, a catalytic oxidation unit, a condensation and dehumidification module and a microparticle catcher which are sequentially connected, water is removed by the molecular sieve adsorber, oxygen is removed by the catalytic oxidation unit, the argon is further dehydrated by the condensation and dehumidification module, and submicron particles are removed by the microparticle catcher, obtaining the parameters of the purified argon, adjusting the opening degree of an air inlet pressure adjusting valve of the closed test cavity according to the parameters of the purified argon, obtaining feedback data of a pressure sensor, and adjusting the inflation rate in real time according to the feedback data until the internal pressure of the cavity is kept in the micro-positive pressure value in a preset range, wherein the preset range is 1-5 kPa, the heat source (2) adopts ceramic heating sheet MCH, the constant-power power supply (3) is internally provided with a heat balance compensation unit, a PID feedback algorithm is used to control the constant-power output, and the method specifically comprises the following steps: obtaining the real-time temperature of the ceramic heating sheet MCH, obtaining the real-time resistance value of the ceramic heating sheet MCH by using a pre-obtained temperature-resistance model, obtaining the real-time power by using a power calculation formula P=U2 / R according to the output voltage of the constant-power power supply (3) and the real-time resistance value of the ceramic heating sheet MCH, wherein P represents the real-time power, U represents the power output voltage, and R represents the real-time resistance value of the ceramic heating sheet MCH, judging the difference between the real-time power and a set power, if the difference is in a preset threshold range, the constant-power power supply (3) keeps the current output, if the difference between the real-time power and the set power exceeds the preset threshold range, the adjustment signal direction is determined according to the difference direction, the adjustment signal direction and the difference size are used to adjust the constant-power power supply (3) to obtain the adjusted power output voltage of the power supply, and the operation is repeated to keep the heating power of the ceramic heating sheet MCH, that is, the real-time power P constant, the middle part of the heat preservation platform (1) is provided with a groove, the heat source (2) is embedded in the groove, and the upper surface of the heat source (2) is flush with the upper surface of the heat preservation platform (1), the method comprises the following steps: selecting the ceramic heating sheet MCH as the heat source (2) for packaging, and the like. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2. The inert gas micro-positive pressure compensation type graphene film heat dissipation performance test system according to claim 1, characterized in that, ​ 3. The method for testing the heat dissipation performance of the inert gas micro-positive pressure compensation graphene film according to any one of claims 1-2, wherein, ​ ​ In the inert gas micro-positive pressure system, the measured material (5) is placed on the upper surface of the heat source (2) of the heat preservation platform (1), and multiple temperature measurement points are configured; The output of the constant power supply (3) is adjusted so that the temperature of the heat source (2) reaches the corresponding temperature measurement point, and the change curve of the heat source measurement temperature with time obtained by the temperature sensor (4) is recorded; All temperature measurement points are traversed, and the change curves of the heat source measurement temperature with time of each temperature measurement point are summarized as test results for evaluating the heat dissipation performance of the measured material (5).

4. The method according to claim 3, wherein, Based on the known thermal conductivity data of the measured material (5), the relationship between the thermal conductivity and the change curve of the measurement temperature with time is established.

5. The method according to claim 3, wherein, The temperature sensor (4) is calibrated using a high-grade temperature standard device with an uncertainty better than 1 / 3 of its accuracy, and a correction value is obtained every 10℃ in the range of 0-350℃ to compensate the accuracy of the temperature sensor (4).

6. The inert gas micro-positive pressure compensation type graphene film heat dissipation performance test method according to claim 4, wherein A plurality of temperature data points of the standard device are obtained every 10℃ in the range of 0-350℃, and a standard temperature data sequence is established; The temperature sensor (4) to be calibrated and the standard device are placed in the same temperature field, and the temperature sensor (4) to be calibrated is measured synchronously according to the temperature points of the standard temperature data sequence, if the absolute value of the difference between the synchronous measurement temperature value and the standard temperature value is greater than a preset threshold, error calculation is performed to obtain an original error data set corresponding to the temperature point; The least square method is used to fit the original error data set to obtain a sensor system error curve, and a temperature compensation data table is generated according to the system error curve, and the temperature value and the corresponding compensation value are recorded; The real-time measurement temperature value of the temperature sensor (4) to be calibrated is obtained, the temperature interval to which the real-time measurement temperature value belongs is judged, and the compensation value corresponding to the real-time measurement temperature value is calculated by using the linear interpolation method according to the temperature compensation data table.

7. The method according to claim 6, wherein, The real-time measurement temperature value and the corresponding compensation value are added, if the result is greater than 350℃, an out-of-range alarm is performed, and the result is transmitted to the display module.

8. The inert gas micro-positive pressure compensation type graphene film heat dissipation performance test method according to claim 3, wherein In the inert gas micro-positive pressure system, multiple heat sources (2) are arranged, and multiple measured materials (5) are placed on the upper surfaces of the corresponding heat sources (2) of the heat preservation platform (1); Each measured material (5) is configured with the same multiple temperature measurement points, the test is performed, the change curves of the heat source measurement temperature with time of each measured material (5) are recorded, and the heat dissipation performances of the multiple measured materials (5) are compared.

Images