Method for detecting dispersity of slurry particles

Abstract

The invention belongs to the field of conductive slurry, and particularly discloses a method for detecting the dispersity of slurry particles. The detection method comprises the following steps: centrifuging slurry, sampling from the bottom of the slurry, and forming a film on the obtained sample to obtain a test sample film; spraying metal on the surface of the test sample film, and observing the particle size and the number of large particles in the test sample film by adopting a scanning electron microscope; the centrifugation is as follows: the slurry is centrifuged for 3-12 times by adopting a centrifugal force of 500-3000g, and each time is centrifuged for 10s-7min. The large particles are actively enriched to the bottom of the slurry through centrifugation, and then are directly sampled and observed from the bottom, so that the large particles are more easily captured and analyzed. According to the method, the problems that in a traditional method, due to the fact that large particles naturally sink to the bottom in the drying film forming process and are difficult to be effectively observed by an electron microscope, size misjudgment and number missing detection are caused are fundamentally avoided, and therefore more accurate statistics and characterization of the large particles in the slurry are achieved.

Description

Technical Field

[0001] This invention belongs to the field of conductive pastes, and specifically relates to a method for detecting the dispersibility of paste particles. Background Technology

[0002] Multilayer ceramic capacitors (MLCCs) combine multiple advantages: small size, compact structure, long lifespan, high reliability, and compatibility with surface mount technology (SMT), thus gaining widespread application. To adapt to the trend towards surface-mount, large capacity, low cost, miniaturization, and high reliability, the industry is increasingly stringent on the performance requirements of their key raw materials, such as ceramic pastes and metal conductive pastes. Ultrafine powders, due to their large specific surface area and high surface energy, are prone to agglomeration, making accurate evaluation of the dispersibility of pastes formulated from them a significant challenge. Taking nickel paste as an example, the traditional method involves drying the paste and then observing large nickel powder particles using a scanning electron microscope. However, this method has inherent drawbacks: the heavier nickel powder settles to the bottom during drying, resulting in smaller and fewer observed large particles, ultimately leading to misjudgments of dispersibility. Summary of the Invention

[0003] In order to overcome at least one of the technical problems existing in the prior art, one of the objectives of the present invention is to provide a method for detecting the dispersibility of slurry particles.

[0004] The second objective of this invention is to provide the application of the above-mentioned method for detecting the particle dispersibility of slurry in the quality inspection of conductive slurry.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: The first aspect of the present invention provides a method for detecting the dispersibility of slurry particles, comprising the following steps: The slurry is centrifuged, and then a sample is taken from the bottom of the slurry and formed into a film to obtain the test sample film. Gold was sputtered onto the surface of the test sample film, and then the particle size and number of large particles in the test sample film were observed using a scanning electron microscope. The centrifugation process involves centrifuging the slurry 3-12 times with a centrifugal force of 500-3000g, each time for 10s-7min.

[0006] In some embodiments of the present invention, the centrifugal force is any value or a range formed by any two of the following: 500g, 600g, 700g, 800g, 900g, 1000g, 1100g, 1200g, 1300g, 1400g, 1500g, 1600g, 1700g, 1800g, 1900g, 2000g, 2100g, 2200g, 2300g, 2400g, 2500g, 2600g, 2700g, 2800g, 2900g, and 3000g.

[0007] In some embodiments of the present invention, the number of centrifugations is any value of 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12 times, or a range formed by any two of these values.

[0008] In some embodiments of the present invention, the centrifugation time is any value or a range formed by any two of the following: 10s, 20s, 30s, 50s, 1min, 1.5min, 2min, 2.5min, 3min, 3.5min, 4min, 4.5min, 5min, 5.5min, 6min, 6.5min, and 7min.

[0009] In some embodiments of the present invention, the large particles refer to particles with a diameter ≥ 1 μm; in some embodiments of the present invention, the large particles refer to particles with a diameter of 1-10 μm; in some embodiments of the present invention, the large particles refer to particles with a diameter of 1-4 μm; in some embodiments of the present invention, the large particles refer to particles with a diameter of 1-3.5 μm.

[0010] In some embodiments of the present invention, the centrifugation is performed by first centrifuging with a centrifugal force of 500-700g, then centrifuging with a centrifugal force of 1000-1500g, and then centrifuging with a centrifugal force of 2000-3000g.

[0011] In some embodiments of the present invention, the centrifugal force of the first centrifugation is any value of 500g, 550g, 600g, 650g, 700g, or a range formed by any two of them.

[0012] In some embodiments of the present invention, the first centrifugation is performed 1-3 times, with each centrifugation lasting 1-5 minutes.

[0013] In some embodiments of the present invention, during the first centrifugation, the centrifugation time is any value of 1 min, 2 min, 3 min, 4 min, 5 min, or a range formed by any two of these values.

[0014] In some embodiments of the present invention, the first centrifugation is performed by centrifuging 2-3 times with a centrifugal force of 600-700g, each time for 2-3 minutes.

[0015] The present invention performs the first centrifugation at a lower centrifugal force, which enables large particles at the center of the slurry to gradually settle or migrate to the pipe wall in the force field, thereby achieving effective screening of large particles.

[0016] In some embodiments of the present invention, the centrifugal force of the second centrifugation is any value of 1000g, 1100g, 1200g, 1300g, 1400g, 1500g, or a range formed by any two of them.

[0017] In some embodiments of the present invention, the second centrifugation is performed 1-5 times, with each centrifugation lasting 30-45 seconds.

[0018] In some embodiments of the present invention, the number of centrifugations in the second centrifugation is any one of 1, 2, 3, 4, or 5 times, or a range formed by any two of them.

[0019] In some embodiments of the present invention, in the second centrifugation, the centrifugation time for each centrifugation is any value of 30s, 35s, 40s, 45s, or a range formed by any two of them.

[0020] In some embodiments of the present invention, the second centrifugation is performed by centrifuging 4-5 times with a centrifugal force of 1200-1300g, each time for 35-40s.

[0021] This invention employs a secondary centrifugation with moderate centrifugal force, which increases the diffusion rate of large particles from the center of the slurry to the edge, thereby improving the screening efficiency of large particles.

[0022] In some embodiments of the present invention, the centrifugal force of the third centrifugation is any value of 2000g, 2100g, 2200g, 2300g, 2400g, 2500g, 2600g, 2700g, 2800g, 2900g, 3000g, or a range formed by any two of these values.

[0023] In some embodiments of the present invention, the third centrifugation is performed 1-3 times, with each centrifugation lasting 15-30 seconds.

[0024] In some embodiments of the present invention, in the third centrifugation, the time for each centrifugation is any value of 15s, 20s, 25s, 30s, or a range formed by any two of them.

[0025] In some embodiments of the present invention, the third centrifugation is performed by centrifuging 1-2 times with a centrifugal force of 2000-2500g, each time for 20-30 seconds.

[0026] This invention uses a larger centrifugal force for a third centrifugation, which can separate large particles that have accumulated at the edge of the slurry onto the wall of the centrifuge tube.

[0027] In some embodiments of the present invention, the slurry has at least one of the following characteristics: (a1) The paste is selected from any one of nickel paste, silver paste, copper paste, palladium paste, and silver-palladium alloy paste; (a2) The solid content of the slurry is 45%-65%; (a3) The viscosity of the slurry measured at 25°C is ≤5000cps.

[0028] In some embodiments of the present invention, the slurry is nickel slurry for MLCCs.

[0029] In some embodiments of the present invention, the solid content of the slurry is any value of 45%, 50%, 55%, 60%, 65%, or a range formed by any two of them.

[0030] In some embodiments of the present invention, the viscosity of the slurry, measured at 25°C, is any value or a range formed by any combination of 500 cps, 1000 cps, 1500 cps, 2000 cps, 2500 cps, 3000 cps, 3500 cps, 4000 cps, 4500 cps, and 5000 cps. In some embodiments of the present invention, the viscosity of the slurry, measured at 25°C, is 1000-2000 cps.

[0031] In some embodiments of the present invention, the sampling from the bottom of the slurry specifically involves: pouring out the upper layer of slurry after centrifugation, and then sampling from the bottom of the slurry.

[0032] In some embodiments of the present invention, forming a film from the sample specifically involves transferring the sample onto a substrate, smoothing it out, and then drying it.

[0033] In some embodiments of the present invention, the leveling is performed using a coater; in some embodiments of the present invention, the leveling is performed using a coater with a gap of 50-100 μm.

[0034] In some embodiments of the present invention, the drying temperature is 60-80°C.

[0035] In some embodiments of the present invention, the drying time is 5-10 minutes.

[0036] In some embodiments of the present invention, the drying is carried out in an oven.

[0037] In some embodiments of the present invention, the substrate is a polyethylene terephthalate (PET) substrate.

[0038] In some embodiments of the present invention, the step of sputtering gold onto the surface of the test sample film specifically involves: attaching the test sample film to the sample stage using conductive tape, then sputtering gold in a gold sputtering instrument, and finally removing the film after sputtering.

[0039] In some embodiments of the present invention, the gold spraying time is 40-80 seconds.

[0040] In some embodiments of the present invention, the step of observing with a scanning electron microscope specifically involves observing the test sample film for 10-20 minutes at a magnification of 5000-10000 using a scanning electron microscope.

[0041] In some embodiments of the present invention, when the viscosity of the slurry measured at 25°C is greater than 5000 cps, the slurry is diluted with a solvent to a viscosity of ≤5000 cps at 25°C before use. If the slurry viscosity is too high, a solvent (e.g., ethyl acetate, dihydroterpineol, dihydroterpineol acetate, etc.) needs to be added for dilution. After stirring, the viscosity of the slurry is reduced to below 5000 cps before testing. If the slurry viscosity is too high, the internal separation resistance increases, and large particles are difficult to separate by centrifugation, resulting in a large deviation in the test results.

[0042] The second aspect of the present invention provides the application of the method for detecting the particle dispersibility of slurry described in the first aspect of the present invention in the quality inspection of conductive slurry.

[0043] The beneficial effects of this invention are as follows: First, large particles are actively enriched to the bottom of the slurry through centrifugation; then, samples are directly taken from the bottom for observation, making it easier to capture and analyze large particles. This method fundamentally avoids the size misjudgment and quantity omissions caused by the natural settling of large particles during drying and film formation, which makes them difficult to observe effectively with an electron microscope, thus achieving more accurate statistics and characterization of large particles in the slurry.

[0044] Furthermore, this invention employs multi-step gradient centrifugation technology, which amplifies the mass differences of particles of different sizes at each step, achieving spatial separation of large particles towards the edge and small particles towards the upper layer. Subsequent sampling and observation of the enriched region (bottom / edge) significantly avoids background interference from small particles, greatly improving the accuracy of large particle detection. The entire detection process can be completed within 2 hours, not only easily determining the presence of large particles and their aggregates, but also providing crucial technical guidance and rapid monitoring methods for slurry process optimization and high-quality, large-scale production. Attached Figure Description

[0045] Figure 1 This is an SEM image of the nickel paste from step 1 of Example 1.

[0046] Figure 2 The image shown is the SEM image obtained in step 4 of Example 1.

[0047] Figure 3 This is the SEM image obtained in step 4 of Comparative Example 1.

[0048] Figure 4 This is an SEM image of the nickel paste from step 1 of Example 4.

[0049] Figure 5 The image shown is the SEM image obtained in step 4 of Example 4.

[0050] Figure 6 This is the SEM image obtained in step 4 of Comparative Example 7. Detailed Implementation

[0051] The specific implementation of the present invention will be further described in detail below with reference to the accompanying drawings and examples, but the implementation and protection of the present invention are not limited thereto. It should be noted that any processes not specifically described in detail below are those that can be implemented or understood by those skilled in the art by referring to the prior art. Reagents or instruments used without specified manufacturers are all conventional products that can be purchased commercially.

[0052] The viscosity of the nickel paste used in the following examples and comparative examples refers to the viscosity measured by a viscometer at 25°C.

[0053] Example 1 This example provides a method for detecting nickel paste, the specific steps of which are as follows: 1. Take nickel paste: Take the internal electrode nickel paste for MLCC. The solid content of the nickel paste is 50% and the viscosity of the nickel paste is 4000cps. 2. Centrifugation: Place 130 mL of nickel paste in a centrifuge tube, balance it with an equal mass of paste (any paste is acceptable, the type is not important, only the weight must be the same as the nickel paste in this invention), and place it in a centrifuge for the first centrifugation, the second centrifugation, and the third centrifugation in sequence; The first centrifugation was performed by centrifuging twice with a centrifugal force of 500g, for 3 minutes each time. The second centrifugation was performed by centrifuging at 1000g four times, for 30 seconds each time. The third centrifugation was performed by centrifuging twice with a centrifugal force of 2000g, each time for 30 seconds.

[0054] 3. Take the large particle enrichment sample from the lower layer of nickel paste after centrifugation: Take out the centrifuge tube after centrifugation, pour out the upper layer of nickel paste, use a sampling spoon to scrape the nickel paste deposited at the bottom of the centrifuge tube, transfer it to a clean and flat PET substrate, use a 60μm gap coater to smooth the nickel paste, and place it in an 80℃ oven to bake for 8 minutes until the nickel paste film is completely dry.

[0055] 4. Scanning electron microscopy (SEM) observation: Cut the dried PET film into appropriate sizes, then use conductive tape to stick the PET film onto the sample stage, spray gold in the gold sputtering instrument for 50 seconds, and then place it in the scanning electron microscope for observation. Use 10,000x magnification to observe for 10 minutes, and count the size and number of large particles with a diameter of 1 μm or more. The measured size and number of large particles with a diameter of 1 μm or more are shown in Table 1 below.

[0056] Example 2 The only difference between the nickel slurry testing method in this example and that in Example 1 is that the solid content of the nickel slurry used in step 1 of this example is 45%.

[0057] Example 3 The only difference between the nickel slurry testing method in this example and that in Example 1 is that the nickel slurry used in step 1 of this example has a solid content of 65%.

[0058] Example 4 The only difference between the nickel slurry testing method in this example and that in Example 1 is that the viscosity of the nickel slurry used in step 1 of this example is 1000 cps.

[0059] Example 5 The difference between the nickel slurry detection method in this example and that in Example 1 is that in step 2 of this example, the first centrifugation is performed twice using a centrifugal force of 600g, with each centrifugation lasting 3 minutes.

[0060] Example 6 The difference between the nickel slurry detection method in this example and that in Example 1 is that in step 2 of this example, the first centrifugation is performed twice using a centrifugal force of 700g, with each centrifugation lasting 3 minutes.

[0061] Example 7 The difference between the nickel slurry detection method in this example and that in Example 1 is that in step 2 of this example, the first centrifugation is performed by centrifuging 3 times with a centrifugal force of 500g, each time for 3 minutes.

[0062] Example 8 The difference between the nickel slurry detection method in this example and that in Example 1 is that in step 2 of this example, the first centrifugation is performed once with a centrifugal force of 500g, and each centrifugation lasts for 3 minutes.

[0063] Example 9 The difference between the nickel slurry detection method in this example and that in Example 1 is that in step 2 of this example, the first centrifugation is performed twice using a centrifugal force of 500g, with each centrifugation lasting 1 minute.

[0064] Example 10 The difference between the nickel slurry detection method in this example and that in Example 1 is that in step 2 of this example, the first centrifugation is performed twice using a centrifugal force of 500g, with each centrifugation lasting 2 minutes.

[0065] Example 11 The difference between the nickel slurry detection method in this example and that in Example 1 is that in step 2 of this example, the first centrifugation is performed twice using a centrifugal force of 500g, with each centrifugation lasting 5 minutes.

[0066] Example 12 The difference between the nickel slurry detection method in this example and that in Example 1 is that in step 2 of this example, the second centrifugation is performed by centrifuging 4 times with a centrifugal force of 1200g, each time for 30s.

[0067] Example 13 The difference between the nickel slurry detection method in this example and that in Example 1 is that in step 2 of this example, the second centrifugation is performed by centrifuging 4 times with a centrifugal force of 1300g, each time for 30s.

[0068] Example 14 The difference between the nickel slurry detection method in this example and that in Example 1 is that in step 2 of this example, the second centrifugation is performed by centrifuging 4 times with a centrifugal force of 1500g, each time for 30s.

[0069] Example 15 The difference between the nickel slurry detection method in this example and that in Example 1 is that in step 2 of this example, the second centrifugation is performed once with a centrifugal force of 1000g, and each centrifugation lasts for 30 seconds.

[0070] Example 16 The difference between the nickel slurry detection method in this example and that in Example 1 is that in step 2 of this example, the second centrifugation is performed by centrifuging 5 times with a centrifugal force of 1000g, each time for 30s.

[0071] Example 17 The difference between the nickel slurry detection method in this example and that in Example 1 is that in step 2 of this example, the second centrifugation is performed once with a centrifugal force of 1000g, and each centrifugation lasts for 40 seconds.

[0072] Example 18 The difference between the nickel slurry detection method in this example and that in Example 1 is that in step 2 of this example, the second centrifugation is performed by centrifuging 4 times with a centrifugal force of 1000g, each time for 45s.

[0073] Example 19 The difference between the nickel slurry detection method in this example and that in Example 1 is that in step 2 of this example, the third centrifugation is performed twice using a centrifugal force of 2500g, with each centrifugation lasting 30s.

[0074] Example 20 The difference between the nickel slurry detection method in this example and that in Example 1 is that in step 2 of this example, the third centrifugation is performed twice using a centrifugal force of 3000g, with each centrifugation lasting 30s.

[0075] Example 21 The difference between the nickel slurry detection method in this example and that in Example 1 is that in step 2 of this example, the third centrifugation is performed once with a centrifugal force of 2000g, and each centrifugation lasts for 30 seconds.

[0076] Example 22 The difference between the nickel slurry detection method in this example and that in Example 1 is that in step 2 of this example, the third centrifugation is performed by centrifuging 3 times with a centrifugal force of 2000g, each time for 30s.

[0077] Example 23 The difference between the nickel slurry detection method in this example and that in Example 1 is that in step 2 of this example, the third centrifugation is performed twice using a centrifugal force of 2000g, with each centrifugation lasting 15s.

[0078] Comparative Example 1 The difference between the nickel slurry detection method in this example and that in Example 1 is that in step 2 of this example, the first centrifugation is performed twice using a centrifugal force of 300g, with each centrifugation lasting 3 minutes.

[0079] Comparative Example 2 The difference between the nickel slurry detection method in this example and that in Example 1 is that in step 2 of this example, the first centrifugation is performed twice using a centrifugal force of 800g, with each centrifugation lasting 3 minutes.

[0080] Comparative Example 3 The difference between the nickel slurry detection method in this example and that in Example 1 is that in step 2 of this example, the second centrifugation is performed by centrifuging 4 times with a centrifugal force of 800g, each time for 30s.

[0081] Comparative Example 4 The difference between the nickel slurry detection method in this example and that in Example 1 is that in step 2 of this example, the second centrifugation is performed by centrifuging 4 times with a centrifugal force of 1600g, each time for 30s.

[0082] Comparative Example 5 The difference between the nickel slurry detection method in this example and that in Example 1 is that in step 2 of this example, the third centrifugation is performed twice using a centrifugal force of 1800g, with each centrifugation lasting 30s.

[0083] Comparative Example 6 The difference between the nickel slurry detection method in this example and that in Example 1 is that in step 2 of this example, the third centrifugation is performed twice using a centrifugal force of 3000g, with each centrifugation lasting 30s.

[0084] Comparative Example 7 The only difference between the nickel slurry testing method in this example and that in Example 1 is that the viscosity of the nickel slurry used in step 1 of this example is 1000 cps.

[0085] Comparative Example 8 The difference between the nickel slurry detection method in this example and that in Example 1 is only that: in this example, step 2 is as follows: take 130 mL of nickel slurry and place it in a centrifuge tube, balance it with an equal mass of slurry, place it in a centrifuge, and centrifuge it 6 times with a centrifugal force of 2000 g, each time for 1.5 min.

[0086] The average particle size and quantity of the nickel paste detected in Examples 1-23 and Comparative Examples 1-8 of this invention are recorded in Table 1 below.

[0087] The average particle size in Examples 1-23 and Comparative Examples 1-8 of this invention is the statistical average value of large powder particles within the field of view.

[0088] The number of large particles larger than 1 μm in Examples 1-23 and Comparative Examples 1-8 of the present invention refers to particles with a diameter larger than 1 μm within the statistical field of view.

[0089] Table 1. Average size and number of large particles larger than 1 μm in nickel paste.

[0090] As shown in Table 1, compared with Comparative Examples 1-8, Examples 1-23 of the present invention utilize a centrifuge to perform multiple centrifugations, selectively enriching large particles larger than 1 μm in the nickel slurry into the lower layer of nickel slurry, while small and medium-sized particles smaller than 1 μm remain in the upper layer of nickel slurry. Then, samples are taken from the lower layer of nickel slurry for observation, making it easier to analyze the dispersion of large particles in the nickel slurry. This results in more accurate detection of the size and quantity of large particles in the nickel slurry using the detection method of the present invention.

[0091] Using a sampling spoon, take the nickel paste from step 1 of Example 1 and transfer it to a clean, flat PET substrate. Use a coater with a 60 μm gap to smooth the nickel paste. Place the substrate in an 80°C oven and bake for 8 minutes until the nickel paste film is completely dry. Cut the dried PET film to a suitable size, attach it to the sample stage with conductive tape, and spray gold for 50 seconds in a gold sprayer. Then observe it under a scanning electron microscope at 10,000x magnification for 10 minutes. Specific test images are shown below. Figure 1 As shown, Figure 2 and Figure 3 The images are SEM images obtained in step 4 of Example 1 and step 4 of Comparative Example 1, respectively.

[0092] Using a sampling spoon, take the nickel paste from step 1 of Example 4 and transfer it to a clean, flat PET substrate. Use a coater with a 60 μm gap to smooth the nickel paste, and bake it in an 80°C oven for 8 minutes until the nickel paste film is completely dry. Cut the dried PET film to a suitable size, attach it to the sample stage with conductive tape, and spray gold for 50 seconds in a gold sprayer. Then observe it under a scanning electron microscope at 10,000x magnification for 10 minutes. Specific test images are shown below. Figure 4 As shown, Figure 5 and Figure 6 The images shown are SEM images of step 4 in Example 4 and step 4 in Comparative Example 7, respectively.

[0093] Depend on Figure 1-6 It can be seen that, because the nickel paste in step 1 of Example 1 and step 1 of Example 4 did not employ a centrifugation step, large nickel powder particles were deposited at the bottom of the film near the PET substrate, resulting in fewer large particles in the obtained SEM images. Compared with Comparative Examples 1 and 7, Examples 1 and 4 used appropriate centrifugation parameters, and the size and quantity of large nickel powder particles could be accurately observed in the SEM images, with higher accuracy in the test results.

[0094] The embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention. Furthermore, the embodiments of the present invention and the features thereof can be combined with each other unless otherwise specified.

Claims

1. A method for detecting the dispersibility of slurry particles, characterized in that: Includes the following steps: The slurry is centrifuged, and then a sample is taken from the bottom of the slurry and formed into a film to obtain the test sample film. Gold was sputtered onto the surface of the test sample film, and then the particle size and number of large particles in the test sample film were observed using a scanning electron microscope. The centrifugation process involves centrifuging the slurry 3-12 times with a centrifugal force of 500-3000g, each time for 10s-7min.

2. The method for detecting the dispersibility of slurry particles according to claim 1, characterized in that: The term "large particles" refers to particles with a diameter ≥ 1 μm.

3. The method for detecting the dispersibility of slurry particles according to claim 1, characterized in that: The centrifugation process involves first centrifuging with a centrifugal force of 500-700g, then centrifuging with a centrifugal force of 1000-1500g, and finally centrifuging with a centrifugal force of 2000-3000g.

4. The method for detecting the dispersibility of slurry particles according to claim 1 or 3, characterized in that: The first centrifugation is performed 1-3 times, with each centrifugation lasting 1-5 minutes. And / or, the second centrifugation is performed 1-5 times, with each centrifugation lasting 30-45 seconds; And / or, the third centrifugation is performed 1-3 times, with each centrifugation lasting 15-30 seconds.

5. The method for detecting the dispersibility of slurry particles according to claim 3, characterized in that: The first centrifugation is performed by centrifuging 2-3 times with a centrifugal force of 600-700g, each time for 2-3 minutes; And / or, the second centrifugation is: centrifuging 4-5 times with a centrifugal force of 1200-1300g, each time for 35-40s; And / or, the third centrifugation is: centrifuging 1-2 times with a centrifugal force of 2000-2500g, each time for 20-30s.

6. The method for detecting the dispersibility of slurry particles according to claim 1, characterized in that: The slurry has at least one of the following characteristics: (a1) The paste is selected from any one of nickel paste, silver paste, copper paste, palladium paste, and silver-palladium alloy paste; (a2) The solid content of the slurry is 45%-65%; (a3) The viscosity of the slurry measured at 25°C is ≤5000cps.

7. The method for detecting the dispersibility of slurry particles according to claim 1, characterized in that: The specific steps to form a film from the sample are as follows: transfer the sample onto the substrate, smooth it out, and then dry it.

8. The method for detecting the dispersibility of slurry particles according to claim 1, characterized in that: The specific steps for observing using a scanning electron microscope are as follows: observe the test sample film for 10-20 minutes using a scanning electron microscope at a magnification of 5000-10000.

9. The method for detecting the dispersibility of slurry particles according to claim 1, characterized in that: When the viscosity of the slurry measured at 25°C is greater than 5000 cps, the slurry is diluted with a solvent to a viscosity of ≤5000 cps at 25°C before use.

10. The application of the method for detecting the particle dispersibility of slurry according to any one of claims 1-9 in the quality inspection of conductive slurry.

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