A barrier powder for sintering of barium titanate-based multilayer ceramic capacitors and a method for preparing the same

Abstract

The application provides a preparation method of a barrier powder for sintering of a barium titanate-based multilayer ceramic capacitor, and the preparation method comprises the following steps: S1, preparing a high-entropy ceramic coating layer precursor solution, wherein the chemical composition of the high-entropy ceramic is A2Zr2O7, wherein A is 5-6 kinds of La, Nd, Sm, Eu, Gd, Yb, Ce, Pr and Y elements; S2, adding zirconium oxide powder particles into the precursor solution in step S1 and stirring uniformly to obtain a mixed solution; S3, adding a precipitant to the mixed solution in step S2 to perform precipitation coating; S4, performing centrifugal separation, washing, drying, calcining and screening treatment on the product obtained in step S3 to obtain zirconium oxide barrier powder with a high-entropy ceramic coating layer. The application performs high-entropy ceramic coating modification on the zirconium oxide barrier powder commonly used in the sintering of the barium titanate-based multilayer ceramic capacitor, thereby isolating the reaction between zirconium oxide and the barium titanate ceramic base, reducing pollution, improving the anti-adhesion property of the barrier powder and improving the yield.

Description

Technical Field

[0001] This invention relates to the field of multilayer ceramic capacitor manufacturing, and in particular to a barium titanate-based insulating powder for sintering multilayer ceramic capacitors and its preparation method. Background Technology

[0002] Multilayer ceramic capacitors (MLCCs) are among the most widely used electronic components today. Due to their small size, large capacitance, and stable performance, they are widely used in various electronic devices and are often referred to as the "rice of the electronics industry." Barium titanate (BaTiO3) based multilayer ceramic capacitors are the mainstream system for MLCC ceramic dielectrics. The casting method is currently the main production method for MLCCs. By adding additives such as solvents, dispersants, and binders, the powder is formulated into a slurry. This slurry is then cast into uniform green sheets using casting molding. The resulting green sheets are then screen-printed with base metals for internal electrodes. After slightly offsetting the electrodes, the printed green sheets are laminated. The laminated green sheets are then cut and subjected to debinding and high-temperature sintering in a suitable atmosphere. Finally, they undergo chamfering and encapsulation processes to complete the final product.

[0003] Sintering is a core process in the production of multilayer ceramic capacitors that determines the quality of the finished product. Specifically, it involves placing the formed ceramic blank in a furnace and heating it to a specific sintering temperature, during which the blank undergoes densification. In the industrial sintering process of sheet-shaped multilayer ceramic capacitors, the industry standard practice is to spread insulating powder on the bottom of a standard sagger and on the blank sheet, and then stack multiple sheet-shaped ceramic capacitor blanks in the sagger to complete the sintering. If insulating powder is not filled between the blanks during stacking and they are directly stacked, although the sintered ceramic sheets can maintain a better flatness, the sheets are prone to sticking together. This not only makes them difficult to separate, but also leaves adhesive marks on the surface of the ceramic sheets after separation, severely reducing production efficiency and product quality. To avoid this problem, existing processes coat the green body layers with insulating powder, which can effectively prevent the sheets from sticking together after sintering and improve production efficiency. However, the selection of insulating powders is currently limited, with zirconium oxide being the most commonly used. Although it can play a certain role in preventing sticking, it still has some shortcomings. For example, although zirconium oxide has a certain degree of inertness at high temperatures, it still has a certain degree of activity for barium titanate-based multilayer ceramic capacitors. During high-temperature sintering, it diffuses into the barium titanate capacitor ceramic matrix and reacts with it in trace amounts, introducing unnecessary impurities and adversely affecting the performance of the ceramic capacitor. At the same time, zirconium oxide has good wettability to barium titanate, further increasing the sticking phenomenon during high-temperature sintering. As a result, even with the current use of zirconium oxide insulating powder, there is still a 1-2% sticking defect rate when sintering barium titanate-based multilayer ceramic capacitors at high temperatures, and the anti-sticking performance needs to be improved.

[0004] In view of the above, there is an urgent need to provide a suitable barium titanate-based insulating powder for sintering multilayer ceramic capacitors and its preparation method, so that it has low reactivity in the high-temperature sintering of multilayer ceramic capacitors and better anti-blocking performance.

[0005] It should be noted that the above description of the technical background is only for the purpose of providing a clear and complete explanation of the technical solutions of the present invention and facilitating understanding by those skilled in the art. It should not be assumed that the above technical solutions are known to those skilled in the art simply because they have been described in the background section of this invention. Summary of the Invention

[0006] In view of the shortcomings of the prior art described above, the purpose of this invention is to provide an insulating powder for sintering barium titanate-based multilayer ceramic capacitors and its preparation method, so as to solve the problem of high defect rate caused by adhesion during high-temperature sintering of barium titanate-based multilayer ceramic capacitors in the prior art.

[0007] To achieve the above and other related objectives, the present invention provides a method for preparing a barium titanate-based multilayer ceramic capacitor sintering insulating powder, the preparation method comprising the following steps: S1: Prepare a high-entropy ceramic coating precursor solution, wherein the chemical composition of the high-entropy ceramic is A2Zr2O7, and the A element is 5 to 6 of the elements La, Nd, Sm, Eu, Gd, Yb, Ce, Pr and Y. S2: Add zirconium oxide powder particles to the precursor solution described in step S1 and stir until homogeneous to obtain a mixture; S3: Add a precipitant to the mixture in step S2 to precipitate and coat it; S4: The product obtained in step S3 is centrifuged, washed, dried, calcined, and sieved to obtain zirconium oxide isolation powder with a high-entropy ceramic coating.

[0008] Optionally, step S1 specifically involves: preparing salt solutions of element A, preparing a salt solution of zirconium, and mixing the salt solutions of element A and zirconium according to the chemical composition of the high-entropy ceramic to obtain a coating layer precursor solution.

[0009] Optionally, the elements of A are in equimolar proportions.

[0010] Optionally, the salt solution is a nitrate solution.

[0011] Optionally, the stirring time in step S1 is 30-60 minutes.

[0012] Optionally, the chemical composition of the high-entropy ceramic is (La) 0.2 Yb 0.2 Sm 0.2 Eu0.2 Gd 0.2 )2Zr2O7、(La 0.2 Pr 0.2 Y 0.2 Yb 0.2 Gd 0.2 )2Zr2O7、(La 0.2 Yb 0.2 Pr 0.2 Nd 0.2 Gd 0.2 )2Zr2O7、(La 0.2 Yb 0.2 Pr 0.2 Nd 0.2 Ce 0.2 )2Zr2O7、 (La 1 / 6 Ce 1 / 6 Pr 1 / 6 Y 1 / 6 Yb 1 / 6 Gd 1 / 6 )2Zr2O7、(La 1 / 6 Yb 1 / 6 Sm 1 / 6 Eu 1 / 6 Gd 1 / 6 Pr 1 / 6 One of )2Zr2O7.

[0013] Optionally, the particle size D50 of the zirconium oxide powder is 20~30μm.

[0014] Optionally, the stirring time in step S2 is 45-60 minutes.

[0015] Optionally, the precipitant is one of sodium hydroxide and potassium hydroxide.

[0016] Optionally, the drying temperature is 90~110℃ and the drying time is 1~3h.

[0017] Optionally, the calcination temperature is 1500~1550℃.

[0018] Optionally, the thickness of the high-entropy ceramic coating layer is 5~8μm.

[0019] The present invention also provides an insulating powder for sintering barium titanate-based multilayer ceramic capacitors, wherein the insulating powder for sintering barium titanate-based multilayer ceramic capacitors is prepared by any of the preparation methods described above.

[0020] The present invention also provides the application of the above-mentioned barium titanate-based multilayer ceramic capacitor sintering isolation powder, wherein the barium titanate-based multilayer ceramic capacitor sintering isolation powder is used in the sintering of barium titanate-based multilayer ceramic capacitors.

[0021] As described above, the present invention provides a barium titanate-based multilayer ceramic capacitor sintering insulating powder and its preparation method, which have the following beneficial effects: The present invention modifies the commonly used zirconia insulating powder in the sintering of barium titanate-based multilayer ceramic capacitors with high-entropy ceramic coating, improving the high-temperature phase stability of zirconia particles and avoiding stress concentration in the multilayer ceramic capacitor layers during sintering due to zirconia deformation, thus reducing the risk of deformation and cracking. Simultaneously, the high-entropy rare-earth zirconate phase is high-temperature stable and has lower reactivity with the barium titanate matrix than zirconia, isolating the reaction between zirconia and the barium titanate ceramic substrate, reducing contamination, and improving the purity of the ceramic capacitor. Compared to zirconia, high-entropy rare-earth zirconate has lower wettability, making it difficult for the barium titanate-based capacitor ceramic to adhere to the insulating powder at high temperatures, improving the anti-adhesion properties of the insulating powder and increasing the yield. Finally, high-entropy rare-earth zirconate is also a zirconium-based material, which can better bond with the zirconia matrix, resulting in high bonding strength of the coating layer, making it less prone to detachment, and better exerting anti-adhesion performance. Attached Figure Description

[0022] Figure 1 The image shows a sintered ceramic using the isolation powder of the present invention in Example 1.

[0023] Figure 2 The image shows a sintered ceramic using zirconium oxide isolation powder, as shown in Comparative Example 1. Detailed Implementation

[0024] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

[0025] When describing the embodiments of the present invention in detail, for ease of explanation, the cross-sectional views showing the device structure will be partially enlarged without adhering to the general scale, and the schematic diagrams are merely examples and should not limit the scope of protection of the present invention.

[0026] For ease of description, spatial relation terms such as “below,” “under,” “lower than,” “below,” “above,” and “upper” may be used herein to describe the relationship between one structure or feature shown in the accompanying drawings and other structures or features. It will be understood that these spatial relation terms are intended to include directions other than those depicted in the accompanying drawings for devices in use or operation. Furthermore, when a layer is referred to as being “between” two layers, it can be the only layer between the two layers, or there may be one or more layers in between. The term “between” as used herein includes both endpoint values.

[0027] In the context of this invention, the described structure of the first feature "above" the second feature may include embodiments in which the first and second features are formed in direct contact, or embodiments in which additional features are formed between the first and second features, such that the first and second features may not be in direct contact.

[0028] To achieve the above and other related objectives, the present invention provides a method for preparing a barium titanate-based multilayer ceramic capacitor sintering insulating powder, the preparation method comprising the following steps: S1: Prepare a high-entropy ceramic coating precursor solution, wherein the chemical composition of the high-entropy ceramic is A2Zr2O7, and the A element is 5 to 6 of the elements La, Nd, Sm, Eu, Gd, Yb, Ce, Pr and Y. S2: Add zirconium oxide powder particles to the precursor solution described in step S1 and stir until homogeneous to obtain a mixture; S3: Add a precipitant to the mixture in step S2 to precipitate and coat it; S4: The product obtained in step S3 is centrifuged, washed, dried, calcined, and sieved to obtain zirconium oxide isolation powder with a high-entropy ceramic coating.

[0029] Optionally, step S1 specifically involves: preparing salt solutions of element A, preparing a salt solution of zirconium, and mixing the salt solutions of element A and zirconium according to the chemical composition of the high-entropy ceramic to obtain a coating layer precursor solution.

[0030] Optionally, the elements of A are in equimolar proportions.

[0031] Optionally, the salt solution is a nitrate solution.

[0032] Optionally, the stirring time in step S1 is 30-60 minutes.

[0033] Optionally, the chemical composition of the high-entropy ceramic is (La) 0.2 Yb 0.2 Sm 0.2 Eu 0.2 Gd 0.2 )2Zr2O7、(La 0.2 Pr 0.2 Y 0.2 Yb 0.2 Gd 0.2 )2Zr2O7、(La 0.2 Yb 0.2 Pr 0.2 Nd 0.2 Gd 0.2 )2Zr2O7、(La 0.2 Yb 0.2Pr 0.2 Nd 0.2 Ce 0.2 )2Zr2O7、 (La 1 / 6 Ce 1 / 6 Pr 1 / 6 Y 1 / 6 Yb 1 / 6 Gd 1 / 6 )2Zr2O7、(La 1 / 6 Yb 1 / 6 Sm 1 / 6 Eu 1 / 6 Gd 1 / 6 Pr 1 / 6 One of )2Zr2O7.

[0034] Optionally, the particle size D50 of the zirconium oxide powder is 20~30μm.

[0035] Optionally, the stirring time in step S2 is 45-60 minutes.

[0036] Optionally, the precipitant is one of sodium hydroxide and potassium hydroxide.

[0037] Optionally, the drying temperature is 90~110℃ and the drying time is 1~3h.

[0038] Optionally, the calcination temperature is 1500~1550℃.

[0039] Optionally, the thickness of the high-entropy ceramic coating layer is 5~8μm.

[0040] The present invention also provides an insulating powder for sintering barium titanate-based multilayer ceramic capacitors, wherein the insulating powder for sintering barium titanate-based multilayer ceramic capacitors is prepared by any of the preparation methods described above.

[0041] The present invention also provides the application of the above-mentioned barium titanate-based multilayer ceramic capacitor sintering isolation powder, wherein the barium titanate-based multilayer ceramic capacitor sintering isolation powder is used in the sintering of barium titanate-based multilayer ceramic capacitors.

[0042] As described above, the present invention provides a barium titanate-based multilayer ceramic capacitor sintering insulating powder and its preparation method, which have the following beneficial effects: The present invention modifies the commonly used zirconia insulating powder in the sintering of barium titanate-based multilayer ceramic capacitors with high-entropy ceramic coating, improving the high-temperature phase stability of zirconia particles and avoiding stress concentration in the multilayer ceramic capacitor layers during sintering due to zirconia deformation, thus reducing the risk of deformation and cracking. Simultaneously, the high-entropy rare-earth zirconate phase is high-temperature stable and has lower reactivity with the barium titanate matrix than zirconia, isolating the reaction between zirconia and the barium titanate ceramic substrate, reducing contamination, and improving the purity of the ceramic capacitor. Compared to zirconia, high-entropy rare-earth zirconate has lower wettability, making it difficult for the barium titanate-based capacitor ceramic to adhere to the insulating powder at high temperatures, improving the anti-adhesion properties of the insulating powder and increasing the yield. Finally, high-entropy rare-earth zirconate is also a zirconium-based material, which can better bond with the zirconia matrix, resulting in high bonding strength of the coating layer, making it less prone to detachment, and better exerting anti-adhesion performance.

[0043] Example 1 This embodiment provides a method for preparing insulating powder for sintering barium titanate-based multilayer ceramic capacitors. The specific preparation method includes: S1: Lanthanum nitrate, ytterbium nitrate, samarium nitrate, europium nitrate, and gadolinium nitrate are dissolved in deionized water to prepare a 0.25 mol / L rare earth nitrate solution. Zirconium nitrate is dissolved in deionized water to prepare a 0.5 mol / L zirconium nitrate solution. Based on the chemical formula (La... 0.2 Yb 0.2 Sm 0.2 Eu 0.2 Gd 0.2 The molar ratio of each element in 2Zr2O7 is mixed with the above rare earth nitrate solution and zirconium nitrate solution, and stirred for 30 min to obtain a high-entropy ceramic coating precursor solution. S2: Take 50g of zirconium oxide powder particles with a particle size D50 of 25 micrometers and add them to the above precursor solution. Stir for 45 minutes to obtain a mixture. S3: Add sodium hydroxide solution to the mixture while stirring. Stop adding when the coating layer reaches 6μm. After precipitation, age for 10 hours and let stand to obtain the precipitate coating. S4: Centrifuge the product obtained in the above steps, wash the precipitate with ethanol, put it in an oven, dry it at 105℃ for 2 hours, calcine it at 1500℃ for 3 hours, and obtain the isolation powder for sintering barium titanate-based multilayer ceramic capacitors by sieving.

[0044] Example 2 This embodiment provides a method for preparing insulating powder for sintering barium titanate-based multilayer ceramic capacitors. The specific preparation method includes: S1: Lanthanum nitrate, praseodymium nitrate, ytterbium nitrate, yttrium nitrate, and gadolinium nitrate are dissolved in deionized water to prepare a 0.25 mol / L rare earth nitrate solution. Zirconium nitrate is dissolved in deionized water to prepare a 0.5 mol / L zirconium nitrate solution. Based on the chemical formula (La... 0.2 Pr 0.2 Y 0.2 Yb 0.2 Gd 0.2 The molar ratio of each element in 2Zr2O7 is mixed with the above rare earth nitrate solution and zirconium nitrate solution, and stirred for 30 min to obtain a high-entropy ceramic coating precursor solution. S2: Take 50g of zirconium oxide powder particles with a particle size D50 of 25 micrometers and add them to the above precursor solution. Stir for 45 minutes to obtain a mixture. S3: Add sodium hydroxide solution to the mixture while stirring. Stop adding when the coating layer reaches 6μm. After precipitation, age for 10 hours and let stand to obtain the precipitate coating. S4: Centrifuge the product obtained in the above steps, wash the precipitate with ethanol, put it in an oven, dry it at 105℃ for 2 hours, calcine it at 1500℃ for 3 hours, and obtain the isolation powder for sintering barium titanate-based multilayer ceramic capacitors by sieving.

[0045] Example 3 This embodiment provides a method for preparing insulating powder for sintering barium titanate-based multilayer ceramic capacitors. The specific preparation method includes: S1: Lanthanum nitrate, praseodymium nitrate, ytterbium nitrate, neodymium nitrate, and gadolinium nitrate are dissolved in deionized water to prepare a 0.25 mol / L rare earth nitrate solution. Zirconium nitrate is dissolved in deionized water to prepare a 0.5 mol / L zirconium nitrate solution. Based on the chemical formula (La... 0.2 Yb 0.2 Pr 0.2 Nd 0.2 Gd 0.2 The molar ratio of each element in 2Zr2O7 is mixed with the above rare earth nitrate solution and zirconium nitrate solution, and stirred for 30 min to obtain a high-entropy ceramic coating precursor solution. S2: Take 50g of zirconium oxide powder particles with a particle size D50 of 25 micrometers and add them to the above precursor solution. Stir for 45 minutes to obtain a mixture. S3: Add sodium hydroxide solution to the mixture while stirring. Stop adding when the coating layer reaches 6μm. After precipitation, age for 10 hours and let stand to obtain the precipitate coating. S4: Centrifuge the product obtained in the above steps, wash the precipitate with ethanol, put it in an oven, dry it at 105℃ for 2 hours, calcine it at 1500℃ for 3 hours, and obtain the isolation powder for sintering barium titanate-based multilayer ceramic capacitors by sieving.

[0046] Example 4 This embodiment provides a method for preparing insulating powder for sintering barium titanate-based multilayer ceramic capacitors. The specific preparation method includes: S1: Lanthanum nitrate, praseodymium nitrate, ytterbium nitrate, neodymium nitrate, and cerium nitrate are dissolved in deionized water to prepare a 0.25 mol / L rare earth nitrate solution. Zirconium nitrate is dissolved in deionized water to prepare a 0.5 mol / L zirconium nitrate solution. Based on the chemical formula (La... 0.2 Yb 0.2 Pr 0.2 Nd 0.2 Ce 0.2 The molar ratio of each element in 2Zr2O7 is mixed with the above rare earth nitrate solution and zirconium nitrate solution, and stirred for 30 min to obtain a high-entropy ceramic coating precursor solution. S2: Take 50g of zirconium oxide powder particles with a particle size D50 of 25 micrometers and add them to the above precursor solution. Stir for 45 minutes to obtain a mixture. S3: Add sodium hydroxide solution to the mixture while stirring. Stop adding when the coating layer reaches 6μm. After precipitation, age for 10 hours and let stand to obtain the precipitate coating. S4: Centrifuge the product obtained in the above steps, wash the precipitate with ethanol, put it in an oven, dry it at 105℃ for 2 hours, calcine it at 1500℃ for 3 hours, and obtain the isolation powder for sintering barium titanate-based multilayer ceramic capacitors by sieving.

[0047] Example 5 This embodiment provides a method for preparing insulating powder for sintering barium titanate-based multilayer ceramic capacitors. The specific preparation method includes: S1: Lanthanum nitrate, praseodymium nitrate, ytterbium nitrate, yttrium nitrate, cerium nitrate, and gadolinium nitrate are dissolved in deionized water to prepare a 0.25 mol / L rare earth nitrate solution. Zirconium nitrate is dissolved in deionized water to prepare a 0.5 mol / L zirconium nitrate solution. Based on the chemical formula (La... 1 / 6 Ce 1 / 6 Pr 1 / 6 Y 1 / 6 Yb 1 / 6 Gd 1 / 6 The molar ratio of each element in 2Zr2O7 is mixed with the above rare earth nitrate solution and zirconium nitrate solution, and stirred for 30 min to obtain a high-entropy ceramic coating precursor solution. S2: Take 50g of zirconium oxide powder particles with a particle size D50 of 25 micrometers and add them to the above precursor solution. Stir for 45 minutes to obtain a mixture. S3: Add sodium hydroxide solution to the mixture while stirring. Stop adding when the coating layer reaches 6μm. After precipitation, age for 10 hours and let stand to obtain the precipitate coating. S4: Centrifuge the product obtained in the above steps, wash the precipitate with ethanol, put it in an oven, dry it at 105℃ for 2 hours, calcine it at 1500℃ for 3 hours, and obtain the isolation powder for sintering barium titanate-based multilayer ceramic capacitors by sieving.

[0048] Example 6 This embodiment provides a method for preparing insulating powder for sintering barium titanate-based multilayer ceramic capacitors. The specific preparation method includes: S1: Lanthanum nitrate, praseodymium nitrate, ytterbium nitrate, samarium nitrate, europium nitrate, and gadolinium nitrate are dissolved in deionized water to prepare a 0.25 mol / L rare earth nitrate solution. Zirconium nitrate is dissolved in deionized water to prepare a 0.5 mol / L zirconium nitrate solution. Based on the chemical formula (La... 1 / 6 Yb 1 / 6 Sm 1 / 6 Eu 1 / 6 Gd 1 / 6 Pr 1 / 6 The molar ratio of each element in 2Zr2O7 is mixed with the above rare earth nitrate solution and zirconium nitrate solution, and stirred for 30 min to obtain a high-entropy ceramic coating precursor solution. S2: Take 50g of zirconium oxide powder particles with a particle size D50 of 25 micrometers and add them to the above precursor solution. Stir for 45 minutes to obtain a mixture. S3: Add sodium hydroxide solution to the mixture while stirring. Stop adding when the coating layer reaches 6μm. After precipitation, age for 10 hours and let stand to obtain the precipitate coating. S4: Centrifuge the product obtained in the above steps, wash the precipitate with ethanol, put it in an oven, dry it at 105℃ for 2 hours, calcine it at 1500℃ for 3 hours, and obtain the isolation powder for sintering barium titanate-based multilayer ceramic capacitors by sieving.

[0049] Comparative Example 1 Uncoated D50 consists of 25-micron zirconium oxide powder particles.

[0050] The insulating powders prepared in Examples 1-6 and Comparative Example 1 were used in the sintering of barium titanate-based multilayer ceramic capacitors. Specifically, the multilayer ceramic capacitors were composed of BaTiO3 + 2.5 wt% CaZrO3. Conventional processes such as tape casting, screen printing, lamination, pressing, cutting, and debinding were used to obtain sheet-like blanks. The insulating powders prepared in Examples 1-6 and Comparative Example 1 were sprayed onto the surface of the blanks, followed by high-temperature sintering. The defect rate due to adhesion was calculated after high-temperature sintering; detailed test results are shown in Table 1.

[0051] Table 1 Sample Test Data ; As shown in Table 1, compared to Comparative Example 1, all examples have a lower rate of adhesive defects. Figure 1 , Figure 2 It can also be seen that ceramic slabs sintered using ordinary zirconium oxide separating powder tend to stick together, while ceramic slabs sintered using the separating powder of this invention can be separated better, indicating that the high-entropy ceramic coating can effectively isolate the green body and reduce adhesion. Furthermore, it can be seen that the high-entropy ceramic coating with 6 elements has a better anti-adhesion effect than the high-entropy ceramic coating with 5 elements.

[0052] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A method for preparing a separating powder for sintering barium titanate-based multilayer ceramic capacitors, characterized in that, The preparation method includes the following steps: S1: Prepare a high-entropy ceramic coating precursor solution, wherein the chemical composition of the high-entropy ceramic is A2Zr2O7, where A is 5 to 6 of the elements La, Nd, Sm, Eu, Gd, Yb, Ce, Pr, and Y; S2: Add zirconium oxide powder particles to the precursor solution described in step S1 and stir until homogeneous to obtain a mixture; S3: Add a precipitant to the mixture in step S2 to precipitate and coat it; S4: The product obtained in step S3 is centrifuged, washed, dried, calcined, and sieved to obtain zirconium oxide isolation powder with a high-entropy ceramic coating.

2. The method for preparing the insulating powder for sintering barium titanate-based multilayer ceramic capacitors according to claim 1, characterized in that, Step S1 specifically involves: preparing various salt solutions of element A, preparing a zirconium salt solution, and mixing the various salt solutions of element A and the zirconium salt solution according to the chemical composition of the high-entropy ceramic to obtain a coating layer precursor solution.

3. The method for preparing the insulating powder for sintering barium titanate-based multilayer ceramic capacitors according to claim 1, characterized in that, The elements of A are in equimolar proportions.

4. The method for preparing the insulating powder for sintering barium titanate-based multilayer ceramic capacitors according to claim 2, characterized in that, The salt solution is a nitrate solution.

5. The method for preparing the insulating powder for sintering barium titanate-based multilayer ceramic capacitors according to claim 2, characterized in that, The stirring time in step S1 is 30~60 min.

6. The method for preparing the insulating powder for sintering barium titanate-based multilayer ceramic capacitors according to claim 1, characterized in that, The chemical composition of the high-entropy ceramic is (La 0.2 Yb 0.2 Sm 0.2 Eu 0.2 Gd 0.2 )2Zr2O7、(La 0.2 Pr 0.2 Y 0.2 Yb 0.2 Gd 0.2 )2Zr2O7、(La 0.2 Yb 0.2 Pr 0.2 Nd 0.2 Gd 0.2 )2Zr2O7、(La 0.2 Yb 0.2 Pr 0.2 Nd 0.2 Ce 0.2 )2Zr2O7、 (La 1 / 6 Ce 1 / 6 Pr 1 / 6 Y 1 / 6 Yb 1 / 6 Gd 1 / 6 )2Zr2O7、(La 1 / 6 Yb 1 / 6 Sm 1 / 6 Eu 1 / 6 Gd 1 / 6 Pr 1 / 6 One of )2Zr2O7.

7. The method for preparing the insulating powder for sintering barium titanate-based multilayer ceramic capacitors according to claim 1, characterized in that, The particle size D50 of the zirconium oxide powder is 20~30μm.

8. The method for preparing the insulating powder for sintering barium titanate-based multilayer ceramic capacitors according to claim 1, characterized in that, The precipitant is either sodium hydroxide or potassium hydroxide.

9. The method for preparing the insulating powder for sintering barium titanate-based multilayer ceramic capacitors according to claim 1, characterized in that, The calcination temperature is 1500~1550℃.

10. A barium titanate-based insulating powder for sintering barium titanate-based multilayer ceramic capacitors, characterized in that... The insulating powder for sintering barium titanate-based multilayer ceramic capacitors is prepared by any one of the preparation methods described above.

11. The application of the insulating powder for sintering barium titanate-based multilayer ceramic capacitors according to claim 10, wherein the insulating powder for sintering barium titanate-based multilayer ceramic capacitors is used in the sintering of barium titanate-based multilayer ceramic capacitors.

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