A powder resistivity testing method and device

Abstract

The present invention provides a powder resistivity testing method and device, which relate to the technical field of powder resistivity testing. The method comprises: loading and fixing a powder sample; applying uniform pressure to the loaded powder sample and measuring the real-time resistivity of the powder sample; continuously increasing the applied pressure until the real-time resistivity of the powder sample stabilizes; using the stable real-time resistivity as the resistivity of the powder sample to complete the powder resistivity test. This method measures the resistivity of the powder while applying pressure to the powder, and obtains the resistivity of the powder sample after the real-time resistivity of the powder sample stabilizes, thereby accurately depicting the relationship between the powder resistivity and pressure. This method can ensure that the powder particles are compacted, minimize the contact resistance between the powder particles, and effectively improve the accuracy of the powder resistivity test.

Description

Technical Field

[0001] The present invention relates to the technical field of powder resistivity testing, and in particular to a powder resistivity testing method and device. Background Art

[0002] Existing powder materials are widely used in composite materials due to their advantages, including high electrical and thermal conductivity, low density, and ease of processing. However, the resistivity of some powders, such as conductive carbon black, significantly impacts the electrical conductivity of composite materials. Therefore, accurately assessing the electrical conductivity of powders is crucial. However, powder samples are difficult to press into thin films, making their resistivity impossible to measure using the currently popular four-probe method.

[0003] The existing powder resistivity measurement method is to first press the powder sample into a block before testing. Although this method can realize the test of powder resistivity, it is difficult to ensure whether the powder particles are compacted during the test process, resulting in a large contact resistance between the particles, which affects the final test accuracy and has the problem of low test accuracy. Summary of the Invention

[0004] The present invention aims to provide a powder resistivity testing method and device to solve the above-mentioned technical problems. While applying pressure to the powder, its resistivity is measured, and the relationship between the powder resistivity and pressure is accurately characterized, so as to minimize the contact resistance between the powder particles, thereby improving the accuracy of the powder resistivity test.

[0005] In order to solve the above technical problems, the present invention provides a powder resistivity testing method, comprising the following steps:

[0006] The powder sample is loaded and fixed;

[0007] Apply uniform pressure to the loaded powder sample and measure the real-time resistivity of the powder sample;

[0008] Continue to increase the applied pressure until the real-time resistivity of the powder sample stabilizes;

[0009] The stable real-time resistivity is used as the resistivity of the powder sample to complete the powder resistivity test.

[0010] This approach measures the resistivity of the powder while applying pressure. The resistivity of the powder sample is measured until the real-time resistivity stabilizes, accurately characterizing the relationship between powder resistivity and pressure. This ensures that the powder particles are compacted, minimizes contact resistance between particles, and effectively improves the accuracy of powder resistivity testing.

[0011] Furthermore, the loading and fixing of the powder sample is specifically: loading the powder sample into a cylindrical component and fixing it.

[0012] In the above scheme, loading the powder sample into the cylindrical component can make the powder also present a cylindrical shape, ensuring that it can be evenly stressed in all directions when subjected to pressure, thereby ensuring the resistivity test accuracy and avoiding measurement errors caused by uneven force.

[0013] Furthermore, the step of uniformly applying pressure to the loaded powder sample and measuring the real-time resistivity of the powder sample specifically comprises: uniformly applying pressure to the loaded powder sample and measuring the real-time resistivity of the powder sample using a four-electrode method.

[0014] In the above scheme, the real-time resistivity of the powder sample is measured by the four-electrode method, which can reduce the measurement error and improve the measurement accuracy.

[0015] Furthermore, after continuously increasing the applied pressure until the real-time resistivity of the powder sample stabilizes, the method further includes:

[0016] Control the temperature of the powder sample to a preset temperature value;

[0017] After the real-time resistivity of the powder sample is stable, the real-time resistivity of the powder sample at the corresponding temperature is obtained.

[0018] In the above scheme, by controlling the temperature of the powder sample, while achieving resistivity measurement at different temperatures, the measurement error caused by moisture absorption of the powder can be reduced by high temperature, thereby improving the accuracy of resistivity measurement.

[0019] The above scheme fully considers the resistivity test error caused by moisture absorption of the powder sample and the resistivity difference of the powder sample at different temperatures, thereby achieving a more accurate measurement of the powder resistivity and ensuring that its measurement results can better characterize the conductive properties of the powder.

[0020] Furthermore, controlling the temperature of the powder sample to a preset temperature value specifically includes controlling the temperature of the powder sample to a preset temperature value by heat conduction.

[0021] In the above solution, the temperature of the powder sample is controlled by heat conduction, which is easy to implement and can ensure that the powder sample is heated evenly, thereby reducing measurement errors caused by temperature.

[0022] The present invention also provides a powder resistivity testing device, comprising a loading module, a tablet pressing module, a testing module and a control processing module; wherein:

[0023] The loading module is used to load and fix the powder sample;

[0024] The tablet pressing module is used to apply uniform pressure to the loaded powder sample;

[0025] The testing module is used to measure the real-time resistivity of the powder sample and transmit it to the control processing module;

[0026] The control processing module is used to control the tablet pressing module to continuously increase the applied pressure until the real-time resistivity of the powder sample is stabilized and the stable real-time resistivity is used as the resistivity of the powder sample.

[0027] In this solution, the tableting module applies pressure to the powder while the testing module simultaneously measures its resistivity. This process continues until the real-time resistivity of the powder sample stabilizes, accurately characterizing the relationship between powder resistivity and pressure. This system ensures that powder particles are compacted, minimizes contact resistance between particles, and effectively improves the accuracy of powder resistivity testing.

[0028] Furthermore, the loading module is a cylindrical component.

[0029] In the above scheme, the setting of the cylindrical component can make the powder loaded therein also present a cylindrical shape, ensuring that the powder can be evenly stressed in all directions when subjected to pressure, thereby ensuring the resistivity test accuracy and avoiding measurement errors caused by uneven stress.

[0030] Furthermore, the test module uses a four-electrode method to measure the real-time resistivity of the powder sample.

[0031] In the above scheme, the real-time resistivity of the powder sample is measured by the four-electrode method, which can reduce the measurement error and improve the measurement accuracy.

[0032] Furthermore, the powder resistivity testing device also includes a temperature control module; the temperature control module is used to control the temperature of the powder sample to a preset temperature value; the real-time resistivity of the powder sample measured by the test module is stable, and the real-time resistivity of the powder sample at the corresponding temperature is obtained by the control processing module.

[0033] In the above scheme, the temperature of the powder sample is controlled by the temperature control module, so that the resistivity of the powder at different temperatures can be measured. At the same time, it can reduce the measurement error caused by moisture absorption of the powder and improve the accuracy of the resistivity measurement.

[0034] The above scheme fully considers the resistivity test error caused by moisture absorption of the powder sample and the resistivity difference of the powder sample at different temperatures, thereby achieving a more accurate measurement of the powder resistivity and ensuring that its measurement results can better characterize the conductive properties of the powder.

[0035] Furthermore, the temperature control module is used to control the temperature of the powder sample to a preset temperature value. Specifically, the temperature control module controls the temperature of the powder sample to a preset temperature value by heat conduction.

[0036] The above solution controls the temperature of the powder sample by heat conduction, which is easy to implement and can ensure that the powder sample is heated evenly, thereby reducing measurement errors caused by temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 A schematic flow chart of a powder resistivity testing method provided in one embodiment of the present invention;

[0038] Figure 2 A schematic diagram of module connections of a powder resistivity testing device provided by one embodiment of the present invention;

[0039] Figure 3 A schematic structural diagram of a loading module provided in one embodiment of the present invention;

[0040] Figure 4 A schematic structural diagram of a tablet pressing module provided in one embodiment of the present invention;

[0041] Figure 5 A circuit connection diagram of a test module and a temperature control module provided in one embodiment of the present invention;

[0042] Among them: 1. Control and processing module; 2. Loading module; 201. Cylindrical component; 202. Electrode; 203. Temperature sensor probe; 204. Upper pressure block; 205. Lower pressure block; 3. Pressing module; 301. Handwheel; 302. Screw rod; 303. Bracket; 304. Fixing table; 305. Operating handle; 306. Pressure gauge; 307. Base; 308. Compression equipment; 4. Testing module; 401. Wire; 402. Resistance tester; 5. Temperature control module; 501. Control power supply; 502. Electric heating film. DETAILED DESCRIPTION

[0043] The following will provide a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0044] See Figure 1 , this embodiment provides a powder resistivity testing method, comprising the following steps:

[0045] S1: Load and fix the powder sample;

[0046] S2: Apply uniform pressure to the loaded powder sample and measure the real-time resistivity of the powder sample;

[0047] S3: Continue to increase the applied pressure until the real-time resistivity of the powder sample stabilizes;

[0048] S4: Use the stable real-time resistivity as the resistivity of the powder sample to complete the powder resistivity test.

[0049] This embodiment measures the resistivity of the powder while applying pressure. The resistivity of the powder sample is measured until the real-time resistivity stabilizes, accurately characterizing the relationship between the powder resistivity and pressure. This ensures that the powder particles are compacted, minimizes the contact resistance between the powder particles, and effectively improves the accuracy of the powder resistivity test.

[0050] Furthermore, the loading and fixing of the powder sample is specifically: loading the powder sample into a cylindrical component and fixing it.

[0051] In this embodiment, loading the powder sample into the cylindrical component can make the powder also present a cylindrical shape, ensuring that it can be evenly stressed in all directions when subjected to pressure, thereby ensuring the resistivity test accuracy and avoiding measurement errors caused by uneven stress.

[0052] Furthermore, the step of uniformly applying pressure to the loaded powder sample and measuring the real-time resistivity of the powder sample specifically comprises: uniformly applying pressure to the loaded powder sample and measuring the real-time resistivity of the powder sample using a four-electrode method.

[0053] In this embodiment, the real-time resistivity of the powder sample is measured by a four-electrode method, which can reduce measurement errors and improve measurement accuracy.

[0054] Furthermore, after continuously increasing the applied pressure until the real-time resistivity of the powder sample stabilizes, the method further includes:

[0055] Control the temperature of the powder sample to a preset temperature value;

[0056] After the real-time resistivity of the powder sample is stable, the real-time resistivity of the powder sample at the corresponding temperature is obtained.

[0057] In this embodiment, by controlling the temperature of the powder sample, while achieving resistivity measurement at different temperatures, the measurement error caused by moisture absorption of the powder can be reduced by high temperature, thereby improving the accuracy of the resistivity measurement.

[0058] This embodiment fully considers the resistivity test error caused by moisture absorption of the powder sample and the resistivity difference of the powder sample at different temperatures, thereby achieving a more accurate measurement of the powder resistivity and ensuring that the measurement results can better characterize the conductive properties of the powder.

[0059] Furthermore, controlling the temperature of the powder sample to a preset temperature value specifically includes controlling the temperature of the powder sample to a preset temperature value by heat conduction.

[0060] In this embodiment, the temperature of the powder sample is controlled by heat conduction, which is convenient to implement and can ensure that the powder sample is heated evenly, thereby reducing measurement errors caused by temperature.

[0061] See Figure 2 This embodiment provides a powder resistivity testing device, comprising a loading module 2, a tablet pressing module 3, a testing module 4, and a control processing module 1; wherein:

[0062] The loading module 2 is used to load and fix the powder sample;

[0063] The tablet pressing module 3 is used to apply uniform pressure to the loaded powder sample;

[0064] The testing module 4 is used to measure the real-time resistivity of the powder sample and transmit it to the control processing module 1;

[0065] The control processing module 1 is used to control the tablet pressing module 3 to continuously increase the applied pressure until the real-time resistivity of the powder sample is stabilized and the stabilized real-time resistivity is used as the resistivity of the powder sample.

[0066] In this embodiment, while tableting module 3 applies pressure to the powder, testing module 4 simultaneously measures its resistivity. The resistivity of the powder sample is not acquired until the real-time resistivity stabilizes, accurately characterizing the relationship between powder resistivity and pressure. This system ensures that powder particles are compacted, minimizes contact resistance between powder particles, and effectively improves the accuracy of powder resistivity testing.

[0067] Furthermore, the loading module 2 is a cylindrical component.

[0068] In this embodiment, the provision of the cylindrical component allows the powder loaded therein to also be cylindrical, ensuring that the powder is evenly stressed in all directions when under pressure, thereby ensuring the accuracy of the resistivity test and avoiding measurement errors caused by uneven stress.

[0069] Furthermore, the test module uses a four-electrode method to measure the real-time resistivity of the powder sample.

[0070] In this embodiment, the real-time resistivity of the powder sample is measured by a four-electrode method, which can reduce measurement errors and improve measurement accuracy.

[0071] Furthermore, the powder resistivity testing device also includes a temperature control module 5; the temperature control module 5 is used to control the temperature of the powder sample to a preset temperature value; the real-time resistivity of the powder sample measured by the test module 4 is stable, and the real-time resistivity of the powder sample at the corresponding temperature is obtained by the control processing module 1.

[0072] In this embodiment, the temperature of the powder sample is controlled by the temperature control module 5, so that the resistivity of the powder at different temperatures can be measured. This can also reduce the measurement error caused by moisture absorption of the powder and improve the accuracy of the resistivity measurement.

[0073] This embodiment fully considers the resistivity test error caused by moisture absorption of the powder sample and the resistivity difference of the powder sample at different temperatures, thereby achieving a more accurate measurement of the powder resistivity and ensuring that the measurement results can better characterize the conductive properties of the powder.

[0074] Furthermore, the temperature control module 5 is used to control the temperature of the powder sample to a preset temperature value. Specifically, the temperature control module 5 controls the temperature of the powder sample to a preset temperature value by heat conduction.

[0075] This embodiment controls the temperature of the powder sample by heat conduction, which is easy to implement and can ensure that the powder sample is heated evenly, thereby reducing measurement errors caused by temperature.

[0076] Furthermore, in order to more clearly describe the technical solution of the present invention and highlight its technical features and technical advantages, this embodiment uses conductive carbon black powder as a test sample to provide a specific application of a powder resistivity testing device.

[0077] Conductive carbon black has the advantages of high electrical conductivity, high thermal conductivity, low density and easy processing and molding. It is widely used in composite materials. Its resistivity has a great influence on the conductive properties of composite materials. Therefore, it is of great significance to accurately evaluate its conductive properties through the present invention.

[0078] Further, see Figure 3The loading module 2 of the powder resistivity testing device includes a cylindrical component 201 that extends vertically through the cylindrical component. Five copper rods are embedded in the cylindrical component 201 from top to bottom at its mid-height. Four of these serve as electrodes 202 connected to the test module 4, and one serves as a temperature sensor probe 203 connected to the control and processing module 1. The device also includes a cylindrical demolding component that extends vertically through the cylindrical component 201, the cavity of which has a larger diameter than that of the cylindrical component 201. It also includes an upper pressing block 204, which is formed by connecting a short and thick cylinder with a slender cylinder. The slender cylinder can be plugged into the cylindrical component 201. It also includes a lower pressing block 205, which is formed by connecting a short and thick cylinder with a slender cylinder. The slender cylinder is shorter than the short and thick cylinder of the upper pressing block. The slender cylindrical portions of the upper pressing block 204 and the lower pressing block 205 can move up and down within the cavity of the cylindrical component 201.

[0079] It should be noted that when loading module 2 is assembled, the stubby cylindrical lower block 205 is at the bottom, the cylindrical component 201 is inserted into the slender cylindrical lower block 205, and the slender cylindrical upper block 204 is inserted into the cavity of cylindrical component 201. During demolding, the stubby cylindrical lower block 205 is placed inside the demolding component, and loading module 2 is formed as a whole. At this time, pressing the upper block 204 will naturally release the lower block 205.

[0080] Preferably, the cylindrical component 201 is an insulating component. It has an outer diameter of 3 cm, an inner diameter of 1 cm, and a height of 4 cm. The upper pressing block 204 has a short cylindrical base with a diameter of 2 cm and a height of 1.5 cm, and an elongated cylindrical base with a diameter of 1 cm and a height of 4 cm. The lower pressing block 205 has a short cylindrical base with a diameter of 2 cm and a height of 1 cm.

[0081] It should be noted that the insulating component material is polytetrafluoroethylene, which has excellent mechanical and insulating properties, can withstand greater pressure, and reduce the impact of external factors on the conductive carbon black resistivity test.

[0082] Preferably, the five copper rods embedded in the middle height position of the cylindrical part 201 are distributed in the height range of 1.6 to 2.4 cm from the bottom surface of the cylindrical part 201, and are evenly spaced in the horizontal direction. The length exposed outside the cylindrical part 201 is 1 cm, the length inserted into the inside of the cylindrical part 201 is 0.3 cm, and the diameter of the copper rod is 1 mm.

[0083] In this embodiment, the thickness of the conductive carbon black powder loaded in a single load of the loading module 2 is between 11 and 13 mm. The structure of the loading module 2 determines that it is easy to clean and can effectively prevent the conductive carbon black powder from remaining and affecting subsequent tests.

[0084] Further, see Figure 4The tablet pressing module 3 of the powder resistivity testing device includes a hand wheel 301, a screw 302, a bracket 303, a fixing platform 304, an operating handle 305, a pressure detection gauge 306, a base 307 and a compression device 308; wherein:

[0085] Handwheel 301 is fixedly mounted on top of screw rod 302; screw rod 302 passes through bracket 303 and is threadedly connected to bracket 303; bracket 303 is fixedly mounted on compression device 308; the fixing platform 304 is located directly below screw rod 302 and is used to fix loading module 2. Compression device 308 is used to compress loading module 2 upward. A pressure detection probe is installed on the surface of compression device 308 that contacts loading module 2, and the pressure detection probe is electrically connected to pressure gauge 306. Compression device 308 is fixedly mounted on base 307 and is controlled by operating handle 305.

[0086] It should be noted that the compression device 308 can be a spring compression device or a liquid compression device, and the pressure applied is preferably 0-10 MPa.

[0087] In this embodiment, when pressure needs to be applied to the loading module 2, the loading module 2 is first placed on the fixing table 304 to secure it and connect it to the test module 4. Then, the handwheel 301 is rotated to lower the screw rod 302, causing the lower end of the screw rod 302 to press against the surface of the upper pressure block 204. At this time, appropriate pressure can be applied to the upper pressure block 204 to ensure a stable connection of the loading module 2. After the loading module 2 is secured, the operating handle 305 is used to activate the compression device 308 to continuously apply pressure to the lower pressure block 205 of the loading module 2. The pressure detection gauge 306 can display the real-time pressure situation. The pressure is continuously applied until the measured value of the test module 4 stabilizes and remains unchanged. The relationship between the resistivity of the conductive carbon black powder and the applied pressure is tested.

[0088] It should be noted that the operating handle 305 can also be automatically controlled by the control processing module 1, and the real-time pressure detected by the pressure detection probe will also be sent to the control processing module 1 for processing; the control processing module 1 can be a computer.

[0089] Further, see Figure 5 The test module 4 of the powder resistivity test device includes an alligator clip, a wire 401, and a resistance tester 402. The test module 4 is connected to the electrode 202 on the loading module 2 via the alligator clip. The other end of the alligator clip is electrically connected to the input end of the resistance tester 402 via the wire 401. The output end of the resistance tester 402 is signal-connected to the control and processing module 1.

[0090] It should be noted that the resistance tester 402 is equipped with a voltage test port and a current test port. This embodiment uses a four-electrode method to measure the real-time resistivity of the powder sample, which effectively eliminates the influence of the electrode 202 and the contact resistance, improving the accuracy of the test. The module has simple circuit connection and is easy to operate.

[0091] It should be further explained that after the control processing module 1 receives the test resistance data, the resistivity calculation formula ρ=RS / L is used, where ρ is the resistivity, R is the measured resistance, S is the cross-sectional area of the conductive carbon black powder, that is, the area of a circle with a radius of 0.5 cm; L is the distance between the two voltage electrodes in the vertical direction, which is 0.4 cm.

[0092] Further, see Figure 5 The temperature control module 5 of the powder resistivity testing device includes a control power supply 501 and an electric heating film 502. The electric heating film 502 is mounted on an insulating component. By adjusting the output power of the control power supply 501 to control the temperature of the electric heating film 502, the temperature of the powder in the insulating component is controlled through heat conduction. The control terminal of the control power supply 501 is electrically connected to the control processing module 1.

[0093] Furthermore, the heating range of the temperature control module 5 does not exceed 280°C.

[0094] It should be noted that the electric heating film 502 consumes little heating energy, heats up and cools quickly, occupies a small space, and can precisely control the equilibrium temperature by adjusting the output voltage of the control power supply 501. In conjunction with the temperature sensing probe 203 and the control processing module 1, the powder can be controlled to the set equilibrium temperature.

[0095] Furthermore, the test steps of the above powder resistivity test device are as follows:

[0096] Step 1: Assemble loading module 2. Insert the insulating component into lower pressing block 205. Pour an appropriate amount of conductive carbon black powder into cylindrical component 201. Insert upper pressing block 204 into cylindrical component 201, sealing the other end of cylindrical component 201. Ensure the conductive carbon black powder is 11-13 mm thick.

[0097] Step 2: Assemble the temperature control module 5 . The loading module 2 is placed on the fixing table 304 of the tablet pressing module 3 , the electric heating film 502 wraps the cylindrical component 201 , and is connected to the control power supply 501 , the control processing module 1 and the control processing module 203 .

[0098] Step 3: Connect the circuit of the test module 4. Use alligator clips to connect the electrode 202 to the input port of the resistance tester 402.

[0099] Step 4: Test resistivity by applying pressure. Open the tabletting module 3, rotate the handwheel 301, and lower it to the surface of the tabletting 204 above the handwheel 301. Switch to the operating handle 305 to continue applying pressure. The control processing module 1 records the readings of the pressure detection gauge 306 and the resistance tester 402. Continue applying pressure until the reading of the resistance tester 402 stabilizes. This tests the relationship between the resistivity of the conductive carbon black powder and the applied pressure.

[0100] Step 5: Heating to test resistivity. In step 4, pressurize until the resistance tester 402 shows a stable reading. Then, turn on the temperature control module 5 to control the power supply 501. The control processing module 1 sets the temperature rise program, sets the test temperature range and temperature rise rate, and runs the program to test the relationship between the resistivity and temperature of the conductive carbon black powder.

[0101] This embodiment considers the impact of different temperature conditions on the resistivity of conductive carbon black. Temperature control module 5 is used to heat the conductive carbon black and conduct tests. Furthermore, considering the impact of varying applied pressure and interfacial resistance between powders on the test, a device capable of simultaneously applying pressure and measuring resistance is designed. This allows for a comprehensive and accurate characterization of the resistivity of the conductive carbon black. Furthermore, a four-electrode method is employed to eliminate the influence of contact resistance and electrode 202 resistance on the test results, allowing for more accurate measurements of the resistivity of the conductive carbon black.

[0102] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A powder resistivity testing method, characterized in that: The following steps are involved: The powder sample is loaded and fixed; Apply uniform pressure to the loaded powder sample and use the four-electrode method to measure the real-time resistivity of the powder sample; Continue to increase the applied pressure until the real-time resistivity of the powder sample stabilizes; After the real-time resistivity of the powder sample is stabilized, the temperature of the powder sample is controlled to a preset temperature value; After the real-time resistivity of the powder sample is stable, the real-time resistivity of the powder sample at the corresponding temperature is obtained; The stable real-time resistivity is used as the resistivity of the powder sample to complete the powder resistivity test.

2. A powder resistivity testing method according to claim 1, characterized in that: The loading and fixing of the powder sample specifically includes loading the powder sample into a cylindrical component and fixing it.

3. A powder resistivity testing method according to claim 1, characterized in that: Controlling the temperature of the powder sample to a preset temperature value specifically includes controlling the temperature of the powder sample to a preset temperature value by heat conduction.

4. A powder resistivity testing device, characterized in that: It includes a loading module, a tablet pressing module, a testing module, a control processing module and a temperature control module; wherein: The loading module is used to load and fix the powder sample; The tablet pressing module is used to apply uniform pressure to the loaded powder sample; The test module uses a four-electrode method to measure the real-time resistivity of the powder sample and transmits it to the control processing module; The control processing module is used to control the tableting module to continuously increase the applied pressure until the real-time resistivity of the powder sample is stabilized and the stable real-time resistivity is used as the resistivity of the powder sample; The temperature control module is used to control the temperature of the powder sample to a preset temperature value; the real-time resistivity of the powder sample measured by the test module is stable, and the real-time resistivity of the powder sample at the corresponding temperature is obtained by the control processing module.

5. A powder resistivity testing device according to claim 4, characterized in that: The loading module is a cylindrical component.

6. A powder resistivity testing device according to claim 4, characterized in that: The temperature control module is used to control the temperature of the powder sample to a preset temperature value. Specifically, the temperature control module controls the temperature of the powder sample to a preset temperature value by heat conduction.

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