High-thermal-conductivity interface material detection process

Abstract

The invention discloses a high-thermal-conductivity interface material detection process, which relates to the technical field of high-thermal-conductivity interface material detection, and comprises the following steps: 1, taking out a detection test block, placing the detection test block between two aluminum blocks, and rotating a rotating block to enable a clamp to clamp the two aluminum blocks; the temperature is set to be a specified temperature, baking is carried out for a period of time, a first aging test is carried out, operation is carried out in a constant-temperature chamber of 20 DEG C when the detection test block is put into a thermal resistance tester every 200 hours for thermal resistance detection, measurement is carried out in the constant-temperature chamber each time, and the temperature is not changed, so that the accuracy of experimental data is improved; meanwhile, the aluminum block is clamped through the clamp, the pressure detector needs to be used for measuring each time of clamping, so that the clamping pressure of each time is the same, the elastic force of the steel clamp is not used for applying to the aluminum block, and the accuracy of experimental data is further improved.

Description

Technical Field

[0001] The invention relates to the technical field of high thermal conductivity interface material detection, in particular to a high thermal conductivity interface material detection process. Background Art

[0002] Thermal interface materials, as a type of filler used between two materials, are an important bridge for heat transfer. This type of material has a high thermal conductivity, is easy to deform, and can effectively reduce the thermal resistance between interfaces. The important technical indicator for measuring thermal interface materials is thermal conductivity, and the two main parameters of thermal conductivity are thermal conductivity and thermal resistance. The larger the thermal conductivity, the stronger the heat conduction capacity and the smaller the thermal resistance. Therefore, when testing thermal interface materials, it is necessary to test their thermal resistance.

[0003] At present, the common detection method on the market is to directly test the thermal resistance of the thermal interface material without controlling the indoor temperature. However, since the indoor temperature changes with the seasons, the outside temperature will change each time the test block is tested, and the detection time is relatively long, the outside temperature will affect the thermal resistance of the test block. At the same time, steel clips are generally used as clamps to clamp the two aluminum blocks. However, with the change of temperature, the elasticity of the steel clip will change, which will cause the steel clip to clamp the aluminum block with different strength at different temperatures, thus affecting the test result of the test block. Therefore, it is necessary to optimize the detection process of a high thermal conductivity interface material through technological innovation and design optimization. Summary of the invention

[0004] At present, the common detection method on the market is not to control the indoor temperature, but to directly test the thermal resistance of the thermal interface material. However, since the indoor temperature will change with the change of seasons, the outside temperature will change each time the test block is tested, and the detection time is long, the outside temperature will affect the thermal resistance of the test block. At the same time, steel clamps are generally used as clamps to clamp the two aluminum blocks. However, as the temperature changes, the elasticity of the steel clamp will change, which will cause the steel clamp to clamp the aluminum block at different temperatures. The clamping force is different, which affects the detection result of the test block. In order to solve the above problems, the embodiment of the present application provides a high thermal conductivity interface material detection process. When the test block is placed in a thermal resistance measuring instrument for thermal resistance detection every 200 hours, the operation is performed in a constant temperature chamber of 20°C. Each measurement is performed in a constant temperature chamber and the temperature remains unchanged, so as to improve the accuracy of the experimental data. At the same time, the aluminum block is clamped by a clamp, and each clamping needs to be measured using a pressure detector, so that the clamping pressure is the same each time, and the elastic force of the steel clamp itself is not used to apply to the aluminum block, further improving the accuracy of the experimental data.

[0005] The technical solution adopted by the embodiment of the present application to solve the technical problem is:

[0006] A high thermal conductivity interface material detection process, comprising:

[0007] Step 1: Take out the test block, place it between two aluminum blocks, and rotate the rotating block so that the clamp clamps the two aluminum blocks.

[0008] Step 2: Place the test block together with the aluminum block and the fixture into the first baking furnace, set the temperature to the specified temperature and bake for a certain period of time to conduct the first aging test.

[0009] Step 3: Take the test block together with the aluminum block and the fixture out of the first baking oven, put them into the second baking oven, set the temperature to the specified temperature and bake for a certain period of time to conduct the second aging test.

[0010] Step 4: Take the test block together with the aluminum block and the fixture out of the second baking oven, put it into the first environmental test box, set the temperature and humidity to the specified values, and then conduct the third aging test for a period of time.

[0011] Step 5: Take the test block together with the aluminum block and the fixture out of the first environmental test chamber, put it into the second environmental test chamber, set the temperature and humidity to the specified values, and then conduct the fourth aging test for a period of time.

[0012] Step 6: Take the test block together with the aluminum block and the fixture out of the environmental test chamber, put it into the first hot and cold alternating test chamber, set the temperature and conduct the fifth aging test.

[0013] Step 7: Take the test block together with the aluminum block and the fixture out of the first hot and cold alternating test chamber, put it into the second hot and cold alternating test chamber, set the temperature and conduct the sixth aging test.

[0014] Among them, during each aging test, the test block needs to be placed in a thermal resistance meter to test the thermal resistance every 200 hours. The test needs to be performed in a constant temperature room. If the interval is too short, it is difficult to see the changes in the thermal resistance of the test block, which also increases the number of tests by the staff and increases the staff's work intensity. If the interval is too long, it is difficult to see the subtle changes in the thermal resistance of the test block.

[0015] In one possible implementation, the temperature of the first baking oven is set to 30°C, and the temperature of the second baking oven is set to 120°C. The baking time in the first baking oven is the same as the baking time in the second baking oven, which is 2000 hours. Before placing the test block into the first baking oven and the second baking oven, the thermal resistance of the test block is tested using a thermal resistance meter, and then the test block can be placed in the first baking oven and the second baking oven with the help of clamps only after the first baking oven and the second baking oven have reached the specified temperature, so as to facilitate the detection of the thermal resistance changes of the test block under different temperature conditions.

[0016] In a possible implementation, the temperature inside the first environmental test chamber is 80° C. and the relative humidity is 80%. Before placing the test block into the first environmental test chamber, it is necessary to wait until the test block cools to room temperature and then place it into the first environmental test chamber with the help of a clamp.

[0017] In one possible implementation, the temperature inside the second environmental test chamber is 80°C and the relative humidity is 10%. Before placing the test block in the second environmental test chamber, it is necessary to first use a dryer to dry it, then wait for it to cool to room temperature, and finally place it in the second environmental test chamber to facilitate the detection of changes in thermal resistance of the test block under different humidity conditions.

[0018] In one possible implementation, before the test block is placed in the first hot and cold alternating test chamber, a thermal resistance meter is used to test the thermal resistance of the test block. The temperature inside the first hot and cold alternating test chamber is between -50°C and 120°C, and 1500 shocks are performed at the same time. Within the temperature range of -50°C to 120°C, an alternating shock is performed once every hour until the 1500 shocks are completed.

[0019] In a possible implementation, before the test block is placed in the second hot and cold alternating test chamber, the thermal resistance of the test block is first tested with a thermal resistance meter. The temperature inside the second hot and cold alternating test chamber is between 20°C and 120°C. 3,000 shocks are performed at the same time. The temperature is raised and lowered in a cycle of heating and cooling within the range of 20°C to 120°C, and a cycle is completed every 10 minutes. In this 10-minute cycle, the electric heater switch in the second hot and cold alternating test chamber is turned on for 5 minutes of heating, and then the switch is turned off for cooling for 5 minutes, so as to facilitate the detection of the thermal resistance of the test block under the condition of rapid temperature changes.

[0020] In one possible implementation, each time a measurement is performed, the test block needs to be removed from the fixture, the test block and the aluminum block are placed in a thermal resistance meter, and temperature sensors are inserted into the two aluminum blocks before the thermal resistance measurement is performed, so as to facilitate the measurement and recording of the thermal resistance of the test block.

[0021] In a possible implementation, the area of ​​the test block is about 1 square centimeter, and the area of ​​the aluminum block is larger than that of the test block, so that the aluminum block can clamp the entire test block.

[0022] In a possible implementation, the temperature in the constant temperature chamber is maintained at 20° C. and the temperature cannot be changed. Since the temperature affects the thermal resistance of the test block, ensuring that the test block is tested at the same temperature can prevent the experimental data from being disturbed by the external temperature.

[0023] In one possible implementation, the clamp includes a lower clamping plate, an upper clamping plate is provided on the top of the lower clamping plate, a circular hole is opened on the upper clamping plate, threaded rods are fixed on both sides of the top of the lower clamping plate, the threaded rods pass through the circular holes, and the outside of the threaded rods is located on the top of the upper clamping plate and is threadedly connected with a rotating block. When the rotating block is rotated, the rotating block drives the upper clamping plate to move downward, and the lower clamping plate cooperates with the upper clamping plate to clamp the two aluminum blocks. A pressure detector is required for each clamping so that the clamping pressure is the same each time, which is convenient for applying the same pressure to the two aluminum blocks.

[0024] In summary, the present invention includes at least one of the following beneficial technical effects:

[0025] 1. The test block is placed in the thermal resistance tester for testing thermal resistance every 200 hours. The operation is carried out in a constant temperature room at 20°C. Each measurement is carried out in a constant temperature room at a constant temperature to improve the accuracy of the experimental data.

[0026] 2. By rotating the rotating block, the rotating block drives the upper clamping plate to move downward, and the lower clamping plate cooperates with the upper clamping plate to clamp the two aluminum blocks. Each clamping needs to be measured using a pressure detector to ensure that the clamping pressure is the same each time. The elastic force of the steel clamp itself is not used to apply pressure to the aluminum block, so the pressure will not change with temperature changes, making it easier to apply the same pressure to the two aluminum blocks, further improving the accuracy of the experimental data. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of the clamp of the present invention;

[0028] Figure 2 It is a curve diagram of the thermal resistance test results of the present invention.

[0029] Figure numerals: 1, lower clamping plate; 2, upper clamping plate; 3, rotating block; 4, threaded rod. DETAILED DESCRIPTION

[0030] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the present invention. In addition, the forms of the various structures recorded in the following embodiments are merely illustrative, and the instrument placement rack involved in the present invention is not limited to the various structures recorded in the following embodiments. All other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention.

[0031] Example:

[0032] Step 1: Take out the test block, place the test block between two aluminum blocks, and rotate the rotating block 3 so that the clamp clamps the two aluminum blocks.

[0033] Step 2: Place the test block together with the aluminum block and the fixture into the first baking furnace, set the temperature to the specified temperature and bake for a certain period of time to conduct the first aging test.

[0034] Step 3: Take the test block together with the aluminum block and the fixture out of the first baking oven, put them into the second baking oven, set the temperature to the specified temperature and bake for a certain period of time to conduct the second aging test.

[0035] Step 4: Take the test block together with the aluminum block and the fixture out of the second baking oven, put it into the first environmental test box, set the temperature and humidity to the specified values, and then conduct the third aging test for a period of time.

[0036] Step 5: Take the test block together with the aluminum block and the fixture out of the first environmental test chamber, put it into the second environmental test chamber, set the temperature and humidity to the specified values, and then conduct the fourth aging test for a period of time.

[0037] Step 6: Take the test block together with the aluminum block and the fixture out of the environmental test chamber, put it into the first hot and cold alternating test chamber, set the temperature and conduct the fifth aging test.

[0038] Step 7: Take the test block together with the aluminum block and the fixture out of the first hot and cold alternating test chamber, put it into the second hot and cold alternating test chamber, set the temperature and conduct the sixth aging test.

[0039] Since the indoor temperature changes with the seasons, the outside temperature will change each time the test block is tested, and the test time is long. The outside temperature will affect the thermal resistance of the test block. In each aging test, the test block needs to be placed in a thermal resistance meter every 200 hours to test the thermal resistance. When testing the thermal resistance, it needs to be operated in a constant temperature room. If the interval is too short, it is difficult to see the change in the thermal resistance of the test block, which also increases the number of tests for the staff and the staff's work intensity. If the interval is too long, it is difficult to see the subtle changes in the thermal resistance of the test block.

[0040] When conducting the baking test, the temperature of the first baking oven is set to 30°C, and the temperature of the second baking oven is set to 120°C. The baking time inside the first baking oven is the same as the baking time in the second baking oven, both of which are 2000 hours. Before placing the test block into the first baking oven and the second baking oven, the thermal resistance of the test block is first tested with a thermal resistance meter, and then the test block can be placed in the first baking oven and the second baking oven with the help of clamps after the first baking oven and the second baking oven have reached the specified temperature. The temperatures of the first baking oven and the second baking oven are 30°C and 120°C respectively, with a temperature difference of 90°C. The change in thermal resistance can be clearly seen, and multiple thermal resistance measurements can be performed for a period of 2000 hours. Multiple sets of data can improve the accuracy of the measurement.

[0041] After the baking test, it needs to be placed in the first environmental test box. The temperature inside the first environmental test box is 80°C and the relative humidity is 80%. Before placing the test block in the first environmental test box, it is necessary to wait until the test block cools to room temperature and then use a clamp to place it in the first environmental test box. When the test block is taken out of the bottom second baking oven, the temperature is higher than the temperature inside the first environmental test box. Cooling to room temperature can avoid the original temperature of the test block from affecting the test.

[0042] At the same time, the temperature inside the second environmental test chamber is 80°C and the relative humidity is 10%. Before placing the test block into the second environmental test chamber, it is necessary to first use a dryer to dry it, then wait for it to cool to room temperature, and finally place it in the second environmental test chamber to facilitate the detection of changes in thermal resistance of the test block under different humidity conditions. Since the humidity in the first environmental test chamber is greater than that in the second environmental test chamber, the test block will become damp, and directly placing it in the second environmental test chamber may affect the test data.

[0043] After taking the test block out of the second environmental test chamber, before putting the test block into the first hot and cold alternating test chamber, first use a thermal resistance meter to test the thermal resistance of the test block. The temperature inside the first hot and cold alternating test chamber is between -50℃ and 120℃, and 1500 shocks are performed at the same time. Within the temperature range of -50℃ to 120℃, one alternating shock is performed every 1 hour until the 1500 shocks are completed. Since the temperature changes from below zero to above zero, too fast a temperature change may cause the test block to crack, thereby affecting the test results. Therefore, it takes a long time to change the temperature.

[0044] Before placing the test block into the second hot and cold alternating test chamber, the thermal resistance of the test block is tested with a thermal resistance meter. The temperature inside the second hot and cold alternating test chamber is between 20°C and 120°C. At the same time, 3,000 impacts are performed, and heating and cooling are performed in a temperature rise and fall cycle within the range of 20°C to 120°C. A cycle is completed every 10 minutes. In this 10-minute cycle, the electric heater switch in the second hot and cold alternating test chamber is turned on for 5 minutes of heating, and then the switch is turned off for cooling for 5 minutes. Since the temperature is above zero and the temperature change is small, 10 minutes is enough to complete the temperature change without causing damage to the test block, which is convenient for measuring the thermal resistance of the test block under rapid temperature changes.

[0045] Each time a measurement is performed, the test block must be removed from the fixture, the test block and the aluminum block must be placed in the thermal resistance meter, and the temperature sensors must be inserted into the two aluminum blocks before the thermal resistance is measured. If the test block is tested through the aluminum block, the test result will be inaccurate, and it will be inconvenient to measure and record the thermal resistance of the test block.

[0046] It is worth noting that the area of ​​the test block is about 1 square centimeter, the area of ​​the aluminum block is larger than the area of ​​the test block, and the test block can be wrapped by the aluminum block, so that the aluminum block can clamp the entire test block.

[0047] The temperature in the constant temperature room needs to be suitable for human activities. The temperature in the constant temperature room is maintained at 20°C and the temperature cannot be changed. Since the temperature affects the thermal resistance of the test block, ensuring that the test block is tested at the same temperature can avoid the experimental data being disturbed by the external temperature.

[0048] Generally, a steel clamp is used as a clamp to clamp two aluminum blocks. However, as the temperature changes, the elasticity of the steel clamp will change, which will cause the steel clamp to clamp the aluminum block with different strengths at different temperatures, thereby affecting the test results of the test block. The clamp includes a lower clamping plate 1, an upper clamping plate 2 is provided on the top of the lower clamping plate 1, a round hole is opened on the upper clamping plate 2, threaded rods 4 are fixed on both sides of the top of the lower clamping plate 1, the threaded rods 4 pass through the round holes, and the outside of the threaded rods 4 is located on the top of the upper clamping plate 2 and is threadedly connected with a rotating block 3. When the rotating block 3 is rotated, the rotating block 3 drives the upper clamping plate 2 to move downward, and the lower clamping plate 1 cooperates with the upper clamping plate 2 to clamp the two aluminum blocks. A pressure detector is required for each clamping to ensure that the clamping pressure is the same each time, so as to apply the same pressure to the two aluminum blocks.

[0049] Comparative Example:

[0050] The operation steps of the comparative example are the same as those of the embodiment, the only difference between the two is that the indoor temperature when measuring the thermal resistance of the test block in the comparative example is set to 0 degrees Celsius.

[0051] Thermal resistance test results are as follows Figure 2 As shown by Figure 2 It can be seen that:

[0052] The thermal resistance of the comparative example is lower than that of the example in each measurement. The only difference between the comparative example and the example is that the indoor temperature is different when measuring the thermal resistance of the test block. It can be seen that the temperature during detection has an impact on the thermal resistance of the test block. By placing the test block into the thermal resistance measuring instrument for thermal resistance detection every 200 hours, the operation is performed in a constant temperature room at 20°C. Each measurement is performed in the constant temperature room at a constant temperature, thereby improving the accuracy of the experimental data.

[0053] At the same time, by rotating the rotating block, the rotating block drives the upper clamping plate to move downward, and the lower clamping plate cooperates with the upper clamping plate to clamp the two aluminum blocks. Each clamping needs to be measured using a pressure detector to ensure that the clamping pressure is the same each time. The elastic force of the steel clamp itself is not used to apply pressure to the aluminum block, so the pressure will not change with changes in temperature, which makes it easier to apply the same pressure to the two aluminum blocks, further improving the accuracy of the experimental data.

[0054] Finally, it should be noted that: Obviously, the above embodiments are only examples for clearly explaining the present invention, and are not intended to limit the implementation methods. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from this are still within the scope of protection of the present invention.

Claims

1. A high thermal conductivity interface material detection process, characterized in that: The following steps are involved: Step 1: Take out the test block, place it between two aluminum blocks, and rotate the rotating block (3) so that the clamp clamps the two aluminum blocks; Step 2: Put the test block together with the aluminum block and the fixture into the first baking furnace, set the temperature to the specified temperature and bake for a certain period of time to conduct the first aging test; Step 3: Take the test block together with the aluminum block and the fixture out of the first baking oven, put it into the second baking oven, set the temperature to the specified temperature and bake it for a certain period of time to conduct the second aging test; Step 4: Take the test block together with the aluminum block and the fixture out of the second baking oven, put it into the first environmental test box, set the temperature and humidity to the specified values, and then conduct the third aging test for a period of time; Step 5: Take the test block together with the aluminum block and the fixture out of the first environmental test chamber, put it into the second environmental test chamber, set the temperature and humidity to the specified values, and then conduct the fourth aging test for a period of time; Step 6: Take the test block together with the aluminum block and the fixture out of the environmental test chamber, put it into the first hot and cold alternating test chamber, set the temperature and conduct the fifth aging test; Step 7: Take the test block together with the aluminum block and the fixture out of the first hot and cold alternating test chamber, put it into the second hot and cold alternating test chamber, set the temperature and conduct the sixth aging test; In each aging test, the test block needs to be placed in a thermal resistance tester every 200 hours to test the thermal resistance, and the test needs to be performed in a constant temperature room.

2. A high thermal conductivity interface material detection process as claimed in claim 1, characterized in that: The temperature of the first baking oven is set to 30°C, and the temperature of the second baking oven is set to 120°C. The baking time in the first baking oven is the same as the baking time in the second baking oven, both of which are 2000 hours. Before placing the test block into the first baking oven and the second baking oven, first use a thermal resistance meter to test the thermal resistance of the test block, and then wait until the first baking oven and the second baking oven have reached the specified temperature before placing the test block into the first baking oven and the second baking oven with the help of clamps.

3. A high thermal conductivity interface material detection process as claimed in claim 1, characterized in that: The temperature inside the first environmental test box is 80° C. and the relative humidity is 80%. Before placing the test block into the first environmental test box, it is necessary to wait until the test block cools down to room temperature and then place it into the first environmental test box with the help of a clamp.

4. A high thermal conductivity interface material detection process as claimed in claim 1, characterized in that: The temperature inside the second environmental test chamber is 80°C and the relative humidity is 10%. Before placing the test block into the second environmental test chamber, it is necessary to first use a dryer to dry it, then wait for it to cool to room temperature, and finally place it into the second environmental test chamber.

5. A high thermal conductivity interface material detection process as claimed in claim 1, characterized in that: Before placing the test block into the first hot and cold alternating test chamber, use a thermal resistance meter to test the thermal resistance of the test block. The temperature inside the first hot and cold alternating test chamber is between -50℃ and 120℃, and 1500 shocks are performed at the same time. Within the temperature range of -50℃ to 120℃, one alternating shock is performed every 1 hour until the 1500 shocks are completed.

6. A high thermal conductivity interface material detection process as claimed in claim 1, characterized in that; Before placing the test block into the second hot and cold alternating test chamber, first use a thermal resistance meter to test the thermal resistance of the test block. The temperature inside the second hot and cold alternating test chamber is between 20°C and 120°C. At the same time, 3000 shocks are performed. The temperature rise and fall cycle heating and cooling are performed in the range of 25°C to 125°C. A cycle is completed every 10 minutes. During this 10-minute cycle, turn on the electric heater switch in the second hot and cold alternating test chamber for 5 minutes of heating, and then turn off the switch for cooling for 5 minutes.

7. A high thermal conductivity interface material detection process as claimed in claim 1, characterized in that: Each time a measurement is performed, the test block needs to be taken out of the fixture, the test block and the aluminum block need to be placed in the thermal resistance tester, and the temperature sensors need to be inserted into the two aluminum blocks before the thermal resistance measurement is performed.

8. A high thermal conductivity interface material detection process as claimed in claim 7, characterized in that: The area of ​​the test block is about 1 square centimeter, and the area of ​​the aluminum block is larger than the area of ​​the test block.

9. A high thermal conductivity interface material detection process as claimed in claim 1, characterized in that: The temperature in the constant temperature room is kept at 20°C and the temperature cannot be changed.

10. A high thermal conductivity interface material detection process as claimed in claim 1, characterized in that: The clamp comprises a lower clamping plate (1), an upper clamping plate (2) is arranged on the top of the lower clamping plate (1), a circular hole is opened on the upper clamping plate (2), threaded rods (4) are fixed on both sides of the top of the lower clamping plate (1), the threaded rods (4) pass through the circular holes, and the outside of the threaded rod (4) is located on the top of the upper clamping plate (2) and is threadedly connected to a rotating block (3).

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