Method for cleaning surface of ferrite material

Abstract

The invention relates to a method for cleaning the surface of a ferrite material, which comprises the following steps: (1) spraying water vapor to the surface of the ferrite material, and carrying out water vapor pre-cleaning to obtain a first ferrite material; (2) spraying organic solvent steam to the surface of the first ferrite material, and carrying out organic solvent steam cleaning to obtain a second ferrite material; (3) placing the second ferrite material on a rotary clamp, and performing cross spray cleaning on the second ferrite material by using a cleaning agent to obtain a third ferrite material; and (4) rinsing the third ferrite material by using deionized water, and drying to complete the cleaning of the surface of the ferrite material. According to the cleaning method, the risk that the magnetic core is damaged in the cleaning process is reduced, operation is convenient and efficient, and the cleaning effect is better.

Description

Technical Field

[0001] This invention relates to the field of ferrite material cleaning technology, and in particular to a method for cleaning the surface of ferrite materials. Background Technology

[0002] Ferrite is a common ceramic material widely used in electronic components, such as transformer cores, inductors, and microwave devices. As ferrite technology advances towards higher permeability and lower losses, and is applied in more advanced fields, the performance of ferrite components is now more dependent on surface cleanliness. Any contaminants such as dust, oil, and metal particles can affect their electromagnetic properties and reliability. Traditional cleaning methods include ultrasonic cleaning, manual wiping, and immersion cleaning. Among these, ultrasonic cleaning is widely used due to its high efficiency; it utilizes high-frequency sound waves to create cavitation in the cleaning solution, thereby removing contaminants. However, ferrite is a brittle ceramic, and the high-frequency vibrations and cavitation impacts generated during ultrasonic cleaning can easily cause edge chipping or microcracks, potentially leading to reduced product yield and shortened lifespan.

[0003] CN112452936A discloses a cleaning method for metal thin film circuits on ferrite substrates before electroplating, comprising: (1) spraying the ferrite substrate with "carbon dioxide snow" for a first time; (2) immersing the ferrite substrate after cleaning in step (1) in an acid solution; (3) spraying the ferrite substrate after treatment in step (2) with "carbon dioxide snow" for a second time; and (4) rinsing the ferrite substrate after cleaning in step (3) with pure water, thereby completing the treatment.

[0004] CN115338180A discloses a novel ferrite metallization cleaning method, comprising: (1) immersing a ferrite substrate in a cleaning solvent at 60°C and ultrasonically cleaning it at 250W for 10 minutes; (2) transferring it to pure water at 80°C and ultrasonically cleaning it for 20 minutes with an ultrasonic power of 100W; (3) transferring it to pure water at 80°C and ultrasonically cleaning it for 10 minutes with an ultrasonic power of 100W; (4) heating a 10% KOH solution at 90°C and ultrasonically cleaning it for 30 minutes with an ultrasonic power of 230W; (5) ultrasonically cleaning it in pure water at 80°C for 2 minutes with an ultrasonic power of 100W; (6) ultrasonically cleaning it in a 3% hydrochloric acid solution at room temperature for 10 minutes with an ultrasonic power of 100W; (7) ultrasonically cleaning it in pure water at 80°C for 30 minutes with an ultrasonic power of 100W; (8) ultrasonically cleaning it in an isopropanol organic solvent for 15 minutes with an ultrasonic power of 200W; and (9) centrifuging the ferrite substrate dry.

[0005] The aforementioned existing technologies mostly employ ultrasonic cleaning processes. However, the cavitation effect generated by ultrasonic cleaning can impact brittle ferrite materials, leading to irreversible damage such as edge chipping and cracking, affecting the structural integrity and performance of the product. Furthermore, with the current trend towards miniaturization of ferrite materials, manual cleaning will become even less efficient and less effective at achieving thorough cleaning.

[0006] Therefore, there is an urgent need for a new cleaning method for the surface of ferrite materials to avoid damage such as chipping and cracking. Summary of the Invention

[0007] To address the aforementioned technical problems, this invention provides a method for cleaning the surface of ferrite materials. This invention employs a combined cleaning method involving steam pre-cleaning, organic solvent steam cleaning, cross-spray cleaning, and deionized water rinsing. This avoids the damage such as edge chipping and cracking that can easily occur with traditional ultrasonic cleaning methods. The cleaning method of this invention reduces the risk of damaging the magnetic core during the cleaning process, is convenient and efficient, and provides superior cleaning results.

[0008] To achieve this objective, the present invention adopts the following technical solution:

[0009] This invention provides a method for cleaning the surface of a ferrite material, the cleaning method comprising:

[0010] (1) Water vapor is sprayed onto the surface of the ferrite material to perform water vapor pre-cleaning to obtain the first ferrite material;

[0011] (2) The surface of the first ferrite material is sprayed with organic solvent vapor to perform organic solvent vapor cleaning to obtain the second ferrite material;

[0012] (3) Place the second ferrite material on a rotating fixture and use a cleaning agent to perform cross-spray cleaning on the second ferrite material to obtain the third ferrite material;

[0013] (4) Rinse the third ferrite material with deionized water and dry it to complete the cleaning of the surface of the ferrite material.

[0014] This invention employs a combined cleaning method that combines water vapor pre-cleaning, organic solvent vapor cleaning, cross-spray cleaning, and deionized water rinsing. This method avoids the problems of chipping, cracking, and other damage to materials that are easily caused by traditional ultrasonic cleaning methods.

[0015] This invention first employs a pre-cleaning process using steam. The heat and impact of the steam soften and dissolve some water-soluble contaminants, preparing the surface for subsequent deep cleaning. Next, high-temperature steam generated by heating an organic solvent is sprayed onto the ferrite surface, utilizing the solvent's dissolving power to remove surface dirt. The process involves cross-spray cleaning combined with a rotating fixture, allowing the ferrite material to rotate at multiple angles and be cross-sprayed onto its surface from different directions. Finally, deionized water is used for rinsing to remove any residual cleaning agent and contaminants, thus completing the cleaning of the ferrite material. This invention reduces the risk of core damage during the cleaning process, is convenient and efficient, and provides superior cleaning results.

[0016] It should be noted that the cross-spray cleaning in this invention must ensure that the cleaning agent covers the entire surface, including the pores and grooves of the ferrite material, to avoid dead corners.

[0017] As a preferred technical solution of the present invention, the water vapor pre-cleaning in step (1) includes using water vapor generated by heating deionized water to clean the surface of the ferrite material.

[0018] As a preferred technical solution of the present invention, the temperature of the water vapor pre-cleaning in step (1) is 100-120℃, such as 100℃, 105℃, 110℃, 115℃, 120℃, etc., but is not limited to the listed values. Other unlisted values ​​within the above range are also applicable.

[0019] As a preferred technical solution of the present invention, the organic solvent in step (2) includes any one or a combination of at least two of ethanol, isopropanol or n-propanol. Typical but non-limiting examples of such combinations include: ethanol and isopropanol, ethanol and n-propanol, and isopropanol and n-propanol.

[0020] As a preferred technical solution of the present invention, the temperature of the organic solvent vapor cleaning in step (2) is 60-80℃, such as 60℃, 65℃, 70℃, 75℃, 80℃, etc., but is not limited to the listed values. Other unlisted values ​​within the above range are also applicable.

[0021] As a preferred technical solution of the present invention, the cross-spray cleaning in step (3) includes using at least two spray devices to cross-spray the surface of the second ferrite material from different directions.

[0022] As a preferred technical solution of the present invention, the cleaning agent in step (3) comprises, by mass fraction, 50-80% deionized water, 10-30% organic solvent, 5-15% surfactant, and 0.1-1% defoamer.

[0023] The mass fraction of the deionized water is 50-80%, such as 50%, 55%, 60%, 65%, 70%, 75%, 80%, etc., but it is not limited to the listed values. Other unlisted values ​​within the above range are also applicable.

[0024] The mass fraction of the organic solvent is 10-30%, such as 10%, 15%, 20%, 25%, 30%, etc., but is not limited to the listed values. Other unlisted values ​​within the above range are also applicable.

[0025] The mass fraction of the surfactant is 5-15%, such as 5%, 7%, 9%, 11%, 13%, 15%, etc., but is not limited to the listed values. Other unlisted values ​​within the above range are also applicable.

[0026] The defoamer has a mass fraction of 0.1-1%, such as 0.1%, 0.2%, 0.4%, 0.6%, 0.8%, 1%, etc., but is not limited to the listed values. Other unlisted values ​​within the above range are also applicable.

[0027] Preferably, the organic solvent in the cleaning agent includes ethanol or isopropanol; the surfactant in the cleaning agent includes any one of polyoxyethylene ether, polyoxyethylene ester, polyoxyethylene amide, and glyceryl ester.

[0028] Preferably, the defoamer in the cleaning agent comprises a polyether compound; the polyether compound comprises any one of glycerol polypropylene glycol ether, ethylenediamine polyoxypropylene polyoxyethylene ether, polyether-modified polysiloxane, and glycerol polyoxypropylene polyoxyethylene ether stearate.

[0029] As a preferred technical solution of the present invention, the pH of the cleaning agent in step (3) is 6-8, such as 6, 6.5, 7, 7.5, 8, etc., but is not limited to the listed values. Other unlisted values ​​within the above range are also applicable.

[0030] It should be noted that the final pH of the cleaning agent in this invention needs to be controlled between 6 and 8 to avoid corrosion of the ferrite.

[0031] As a preferred technical solution of the present invention, the spray pressure of the cross-spray cleaning in step (3) is 0.1-0.3MPa, such as 0.1MPa, 0.15MPa, 0.2MPa, 0.25MPa, 0.3MPa, etc., but is not limited to the listed values. Other unlisted values ​​within the above range are also applicable.

[0032] Preferably, the spray temperature of the cross-spray cleaning is 20-30℃, such as 20℃, 22℃, 24℃, 26℃, 28℃, 30℃, etc., but it is not limited to the listed values. Other unlisted values ​​within the above range are also applicable.

[0033] Preferably, the spraying time for the cross-spray cleaning is 2-10 minutes, such as 2 minutes, 3 minutes, 4 minutes, 5 minutes, 6 minutes, 8 minutes, 10 minutes, etc., but it is not limited to the listed values. Other unlisted values ​​within the above range are also applicable.

[0034] As a preferred technical solution of the present invention, the cleaning method includes:

[0035] (1) Water vapor is sprayed onto the surface of the ferrite material to perform water vapor pre-cleaning to obtain the first ferrite material;

[0036] The steam pre-cleaning involves using steam generated by heating deionized water to clean the surface of the ferrite material; the temperature of the steam pre-cleaning is 100-120℃.

[0037] (2) The surface of the first ferrite material is sprayed with organic solvent vapor to perform organic solvent vapor cleaning to obtain the second ferrite material;

[0038] The organic solvent includes any one or a combination of at least two of ethanol, isopropanol, or n-propanol; the temperature for the organic solvent vapor cleaning is 60-80°C.

[0039] (3) Place the second ferrite material on a rotating fixture and use a cleaning agent to perform cross-spray cleaning on the second ferrite material to obtain the third ferrite material;

[0040] The cross-spray cleaning includes using at least two spray devices to cross-spray the surface of the second ferrite material from different directions; the cleaning agent comprises, by mass fraction, 50-80% deionized water, 10-30% organic solvent, 5-15% surfactant, and 0.1-1% defoamer;

[0041] The organic solvent in the cleaning agent includes ethanol or isopropanol; the surfactant in the cleaning agent includes any one of polyoxyethylene ether, polyoxyethylene ester, polyoxyethylene amide, and glyceryl ester; the defoamer in the cleaning agent includes polyether compounds; the polyether compounds include any one of glycerol polypropylene glycol ether, ethylenediamine polyoxypropylene polyoxyethylene ether, polyether-modified polysiloxane, and glycerol polyoxypropylene polyoxyethylene ether stearate;

[0042] The pH of the cleaning agent is 6-8; the spray pressure of the cross-spray cleaning is 0.1-0.3 MPa; the spray temperature of the cross-spray cleaning is 20-30℃; and the spray time of the cross-spray cleaning is 2-10 min.

[0043] (4) Rinse the third ferrite material with deionized water and dry it to complete the cleaning of the surface of the ferrite material.

[0044] Compared with the prior art, the present invention has at least the following beneficial effects:

[0045] This invention first employs a pre-cleaning process using steam. The heat and impact of the steam soften and dissolve some water-soluble contaminants, preparing the surface for subsequent deep cleaning. Next, high-temperature steam generated by heating an organic solvent is sprayed onto the ferrite surface, utilizing the solvent's dissolving power to remove surface dirt. The process involves cross-spray cleaning combined with a rotating fixture, allowing the ferrite material to rotate at multiple angles and be cross-sprayed onto its surface from different directions. Finally, deionized water is used for rinsing to remove any residual cleaning agent and contaminants, thus completing the cleaning of the ferrite material. This invention reduces the risk of core damage during the cleaning process, is convenient and efficient, and provides superior cleaning results. Detailed Implementation

[0046] To facilitate understanding of the present invention, the following embodiments are provided. Those skilled in the art should understand that these embodiments are merely illustrative and should not be construed as limiting the scope of the invention.

[0047] Example 1

[0048] This embodiment provides a method for cleaning the surface of a ferrite material, the cleaning method comprising:

[0049] (1) Use deionized water to heat the generated steam to 100°C to clean the surface of the ferrite material and perform steam pre-cleaning to obtain the first ferrite material.

[0050] (2) Ethanol vapor is sprayed onto the surface of the first ferrite material and cleaned with organic solvent vapor at 60°C to obtain the second ferrite material;

[0051] (3) Place the second ferrite material on a rotating fixture and use two spray devices to spray the cleaning agent from different directions to clean the surface of the second ferrite material in a cross-spraying manner to obtain the third ferrite material.

[0052] The cleaning agent comprises, by mass fraction, 80% deionized water, 14.9% ethanol, 5% polyoxyethylene ether, and 0.1% glycerol polypropylene glycol ether; the pH of the cleaning agent is 6; the spray pressure of the cross-spray cleaning is 0.1 MPa, the spray temperature is 20°C, and the spray time is 10 min.

[0053] (4) Rinse the third ferrite material with deionized water and dry it to complete the cleaning of the surface of the ferrite material.

[0054] Example 2

[0055] This embodiment provides a method for cleaning the surface of a ferrite material, the cleaning method comprising:

[0056] (1) Use deionized water to heat the generated steam to 110°C to clean the surface of the ferrite material and perform steam pre-cleaning to obtain the first ferrite material;

[0057] (2) Isopropanol vapor is sprayed onto the surface of the first ferrite material and cleaned with organic solvent vapor at 70°C to obtain the second ferrite material;

[0058] (3) Place the second ferrite material on a rotating fixture and use three spray devices to spray the cleaning agent from different directions to cross-spray the surface of the second ferrite material to obtain the third ferrite material.

[0059] The cleaning agent comprises, by mass fraction, 74.5% deionized water, 15% isopropanol, 10% polyoxyethylene ester, and 0.5% ethylenediamine polyoxypropylene polyoxyethylene ether; the pH of the cleaning agent is 7; the spray pressure of the cross-spray cleaning is 0.2 MPa, the spray temperature is 25°C, and the spray time is 5 min.

[0060] (4) Rinse the third ferrite material with deionized water and dry it to complete the cleaning of the surface of the ferrite material.

[0061] Example 3

[0062] This embodiment provides a method for cleaning the surface of a ferrite material, the cleaning method comprising:

[0063] (1) Use deionized water to heat the generated steam to 120°C to clean the surface of the ferrite material and perform steam pre-cleaning to obtain the first ferrite material;

[0064] (2) The surface of the first ferrite material is sprayed with n-propanol vapor and cleaned with organic solvent vapor at 80°C to obtain the second ferrite material;

[0065] (3) Place the second ferrite material on a rotating fixture and use four spray devices to spray the cleaning agent from different directions to clean the surface of the second ferrite material in a cross-spraying manner to obtain the third ferrite material.

[0066] The cleaning agent comprises, by mass fraction, 54% deionized water, 30% ethanol, 15% polyoxyethylene amide, and 1% polyether-modified polysiloxane; the pH of the cleaning agent is 8; the spray pressure of the cross-spray cleaning is 0.3 MPa, the spray temperature is 30°C, and the spray time is 2 min.

[0067] (4) Rinse the third ferrite material with deionized water and dry it to complete the cleaning of the surface of the ferrite material.

[0068] Example 4

[0069] This embodiment provides a cleaning method for the surface of ferrite materials. The difference from Embodiment 1 is that the composition of the cleaning agent in step (2) is adjusted to include 80% deionized water, 13% ethanol, 5% polyoxyethylene ether, and 2% glycerol polypropylene glycol ether by mass fraction. All other components are the same as in Embodiment 1.

[0070] Example 5

[0071] This embodiment provides a cleaning method for the surface of ferrite materials. The difference from Embodiment 1 is that the glycerol polypropylene glycol ether in the cleaning agent in step (2) is replaced with ethanol, while the rest is the same as in Embodiment 1.

[0072] Example 6

[0073] This embodiment provides a cleaning method for the surface of ferrite materials. The difference from Embodiment 1 is that the polyoxyethylene ether of the cleaning agent in step (2) is replaced with deionized water. All other aspects are the same as in Embodiment 1.

[0074] Example 7

[0075] This embodiment provides a cleaning method for the surface of ferrite materials. The difference from Embodiment 1 is that the pH of the cleaning agent in step (2) is adjusted to 5, while the rest is the same as in Embodiment 1.

[0076] Example 8

[0077] This embodiment provides a cleaning method for the surface of ferrite materials. The difference from Embodiment 1 is that the pH of the cleaning agent in step (2) is adjusted to 9, while the rest is the same as in Embodiment 1.

[0078] A comparison of Examples 1 and 4-8 shows that the present invention, by limiting the composition and pH of the cleaning agent, can avoid corrosion of ferrite and achieve better cleaning results; it can obtain ferrite materials with clean surfaces and no dirt.

[0079] Comparative Example 1

[0080] This comparative example provides a cleaning method for the surface of ferrite materials. The difference from Example 1 is that water vapor pre-cleaning is not performed, but organic solvent vapor cleaning is performed directly. All other aspects are the same as in Example 1.

[0081] Comparative Example 2

[0082] This comparative example provides a cleaning method for the surface of a ferrite material. The difference from Example 1 is that the water vapor pre-cleaning is replaced with ultrasonic treatment with deionized water, while all other aspects are the same as in Example 1.

[0083] Comparative Example 3

[0084] This comparative example provides a method for cleaning the surface of a ferrite material. The difference from Example 1 is that in step (3), the second ferrite material is not placed on a rotating fixture, but is sprayed and cleaned only in the same direction. All other steps are the same as in Example 1.

[0085] A comparison of Example 1 and Comparative Examples 1-3 shows that Comparative Example 1, by not performing pre-cleaning with steam, resulted in some water-soluble contaminants not being completely removed, thus affecting the cleaning effect of the ferrite material. In Comparative Example 2, the pre-cleaning with steam was replaced with ultrasonic treatment with deionized water. The cavitation effect generated by ultrasonic cleaning would impact the brittle ferrite material, causing irreversible damage such as edge chipping and cracking, leading to a decrease in the quality of the ferrite material. In Comparative Example 3, the second ferrite material was not placed on a rotating fixture, and it was only sprayed and cleaned in the same direction. This posed a risk of incomplete spray cleaning and the creation of dead zones.

[0086] In summary, this invention provides a method for cleaning the surface of ferrite materials. First, a pre-cleaning process using steam softens and dissolves some water-soluble contaminants using the heat and impact of the steam. This pre-cleaning prepares the material for subsequent deep cleaning. Next, high-temperature steam generated by heating an organic solvent is sprayed onto the ferrite surface, utilizing the solvent's dissolving power to dissolve surface dirt. The process involves cross-spray cleaning combined with a rotating fixture, allowing the ferrite material to rotate at multiple angles and be cross-sprayed from different directions. Finally, deionized water is used for rinsing to remove any residual cleaning agent and contaminants, thus completing the cleaning of the ferrite material. This invention reduces the risk of damage to the magnetic core during the cleaning process, is convenient and efficient, and provides superior cleaning results.

[0087] The applicant declares that the above description is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention fall within the protection and disclosure scope of the present invention.

Claims

1. A method for cleaning the surface of a ferrite material, characterized in that, The cleaning method includes: (1) Water vapor is sprayed onto the surface of the ferrite material to perform water vapor pre-cleaning to obtain the first ferrite material; (2) The surface of the first ferrite material is sprayed with organic solvent vapor to perform organic solvent vapor cleaning to obtain the second ferrite material; (3) Place the second ferrite material on a rotating fixture and use a cleaning agent to perform cross-spray cleaning on the second ferrite material to obtain the third ferrite material; (4) Rinse the third ferrite material with deionized water and dry it to complete the cleaning of the surface of the ferrite material.

2. The cleaning method according to claim 1, characterized in that, Step (1) involves pre-cleaning the ferrite material surface with steam generated by heating deionized water.

3. The cleaning method according to claim 1 or 2, characterized in that, The temperature of the water vapor pre-cleaning in step (1) is 100-120℃.

4. The cleaning method according to any one of claims 1-3, characterized in that, The organic solvent in step (2) includes any one or a combination of at least two of ethanol, isopropanol or n-propanol.

5. The cleaning method according to any one of claims 1-4, characterized in that, The temperature of the organic solvent steam cleaning in step (2) is 60-80℃.

6. The cleaning method according to any one of claims 1-5, characterized in that, Step (3) involves cross-spraying the surface of the second ferrite material using at least two spray devices from different directions.

7. The cleaning method according to any one of claims 1-6, characterized in that, The cleaning agent in step (3) comprises, by mass fraction, 50-80% deionized water, 10-30% organic solvent, 5-15% surfactant, and 0.1-1% defoamer; Preferably, the organic solvent in the cleaning agent includes ethanol or isopropanol; the surfactant in the cleaning agent includes any one of polyoxyethylene ether, polyoxyethylene ester, polyoxyethylene amide, and glyceryl ester. Preferably, the defoamer in the cleaning agent comprises a polyether compound; the polyether compound comprises any one of glycerol polypropylene glycol ether, ethylenediamine polyoxypropylene polyoxyethylene ether, polyether-modified polysiloxane, and glycerol polyoxypropylene polyoxyethylene ether stearate.

8. The cleaning method according to any one of claims 1-7, characterized in that, The pH of the cleaning agent in step (3) is 6-8.

9. The cleaning method according to any one of claims 1-8, characterized in that, The spray pressure for the cross-spray cleaning in step (3) is 0.1-0.3 MPa; Preferably, the spray temperature of the cross-spray cleaning is 20-30℃; Preferably, the spraying time for the cross-spray cleaning is 2-10 minutes.

10. The cleaning method according to any one of claims 1-9, characterized in that, The cleaning method includes: (1) Water vapor is sprayed onto the surface of the ferrite material to perform water vapor pre-cleaning to obtain the first ferrite material; The steam pre-cleaning involves using steam generated by heating deionized water to clean the surface of the ferrite material; the temperature of the steam pre-cleaning is 100-120℃. (2) The surface of the first ferrite material is sprayed with organic solvent vapor to perform organic solvent vapor cleaning to obtain the second ferrite material; The organic solvent includes any one or a combination of at least two of ethanol, isopropanol, or n-propanol; the temperature for the organic solvent vapor cleaning is 60-80°C. (3) Place the second ferrite material on a rotating fixture and use a cleaning agent to perform cross-spray cleaning on the second ferrite material to obtain the third ferrite material; The cross-spray cleaning includes using at least two spray devices to cross-spray the surface of the second ferrite material from different directions; the cleaning agent comprises, by mass fraction, 50-80% deionized water, 10-30% organic solvent, 5-15% surfactant, and 0.1-1% defoamer; The organic solvent in the cleaning agent includes ethanol or isopropanol; the surfactant in the cleaning agent includes any one of polyoxyethylene ether, polyoxyethylene ester, polyoxyethylene amide, and glyceryl ester. The defoamer in the cleaning agent includes polyether compounds; the polyether compounds include any one of glycerol polypropylene glycol ether, ethylenediamine polyoxypropylene polyoxyethylene ether, polyether-modified polysiloxane, and glycerol polyoxypropylene polyoxyethylene ether stearate; the pH of the cleaning agent is 6-8; the spray pressure of the cross-spray cleaning is 0.1-0.3 MPa; the spray temperature of the cross-spray cleaning is 20-30℃; and the spray time of the cross-spray cleaning is 2-10 min. (4) Rinse the third ferrite material with deionized water and dry it to complete the cleaning of the surface of the ferrite material.