CN111098390A - Method for determining casting condition of ferrite slurry - Google Patents
Method for determining casting condition of ferrite slurry Download PDFInfo
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- CN111098390A CN111098390A CN201811253165.4A CN201811253165A CN111098390A CN 111098390 A CN111098390 A CN 111098390A CN 201811253165 A CN201811253165 A CN 201811253165A CN 111098390 A CN111098390 A CN 111098390A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/29—Producing shaped prefabricated articles from the material by profiling or strickling the material in open moulds or on moulding surfaces
Abstract
The invention provides a method for determining the casting condition of ferrite slurry, which comprises the following steps: (1) manually coating the ferrite slurry, and judging whether the ferrite slurry meets the casting requirement; (2) setting different blade pitches for the ferrite slurry meeting the casting requirement, manually coating, measuring the thickness of the ferrite green sheet obtained by manual coating, and obtaining the relation between the blade pitch of the ferrite slurry of the batch in the step (1) and the thickness of the obtained ferrite green sheet; (3) and (3) determining the scraper spacing of a casting machine required when the casting machine is used for casting the ferrite slurry meeting the casting requirement in the step (2) according to the corresponding relation obtained in the step (2) and the required thickness of the ferrite green sheet. The method provided by the invention solves the problem of how to make the thickness of the casting green sheet in place in one step, and can ensure that qualified ferrite green sheets are obtained.
Description
Technical Field
The invention belongs to the technical field of magnetic material manufacturing, and relates to a method for determining the casting condition of ferrite slurry.
Background
The electromagnetic induction wireless charging utilizes the electromagnetic induction principle of electricity generation and magnetism generation, namely, the mutual conversion between electricity and magnetism can be realized. The mobile phone and the wireless charger are respectively provided with a receiving/transmitting coil at two ends, the current of the wireless charger generates a magnetic field through the coil at the transmitting end, the coil at the receiving end of the mobile phone generates current when approaching the magnetic field, and then the current is converted into usable DC direct current through a built-in rectification voltage-stabilizing filter circuit of the mobile phone.
In a wireless charging device, a nickel-copper-zinc soft magnetic ferrite sheet is used, and because the magnetic sheet is used in a mobile phone, the used magnetic sheet is limited to be very thin, generally 20-300 mu m, the magnetic sheet is prepared by using pre-sintered magnetic powder, adding a certain amount of binder, plasticizer and dispersant to synthesize slurry, casting the slurry into a raw belt, cutting, and then sintering at high temperature, and because the required magnetic sheet is very thin, the sintered magnetic sheet has no impurities in appearance and high flatness, green sheets which have no impurities, no stripes and smooth appearance can be cast during casting, green sheets which meet the requirement can be cast, and the slurry which has no agglomeration can be prepared in the slurry. However, it is difficult to determine whether the prepared slurry can meet the casting requirement by a quick and effective means in the quantitative process, and it is difficult to achieve the casting green sheet size in one step.
CN105541314A provides a preparation method of ferrite sheet, comprising: uniformly mixing ferrite magnetic powder, a dispersing agent, a binder, a plasticizer and a solvent to form slurry; casting the slurry to prepare a ferrite green sheet; drying the ferrite green sheets, sequentially stacking the ferrite green sheets, the roughening medium and the steel plate according to the sequence of the roughening medium, the ferrite green sheets, the roughening medium and the steel plate, filling the stacked ferrite green sheets, the roughening medium and the steel plate into a packaging bag, and carrying out vacuum sealing; carrying out pressure equalization and coarsening on the packaged ferrite green sheets, and then taking out the coarsened ferrite green sheets; and stacking a plurality of the coarsened ferrite green sheets, placing the stacked ferrite green sheets on a burning bearing plate, and carrying out glue discharging and sintering to obtain a ferrite sheet.
CN104844186A discloses a method for preparing a flexible sintered ferrite membrane, which comprises: 1) preparing slurry: adding ferrite powder and a solvent into a ball milling tank according to a preset proportion and carrying out ball milling; 2) filtering the slurry: pouring the prepared slurry out of the ball milling tank; 3) casting: adopting a steel belt casting process or a PET film casting process, enabling the slurry to flow out of a flat and uniform material belt on a steel belt or a PET film, and drying the material belt by using an oven; 4) laminating: laminating the raw material tapes under a laminating machine according to the thickness requirement of the film; 5) isostatic pressing: carrying out isostatic pressing on the laminated material belt; 6) cutting the raw material belt: cutting the material belt into required size; 7) rubber discharging: the glue discharging temperature is 0 ℃ to 450 ℃, and the heating speed is 0.5 ℃/min; 8) and (3) sintering: the sintering temperature is 980 ℃, the temperature is kept for 2h, and the heating rate is 2 ℃/min; 9) film covering: covering the PET single-sided adhesive and the double-sided adhesive on the ferrite film by using a film covering machine; 10) splitting: the ferrite film was crushed.
CN103113094B discloses a broadband high-permeability ferrite green tape and a method for manufacturing chip inductor element from the same. The unsintered tape includes: pre-burning ferrite powder and an organic tape casting system; wherein, the pre-burning ferrite powder comprises: iron oxide, nickel oxide, copper oxide, zinc oxide, bismuth oxide and additives; an organic tape casting system comprising: solvent, dispersant, binder and plasticizer. The prepared 65-75 mu m LTCF raw material belt has smooth surface, the raw material belt is sintered and compact at about 900 ℃, and the magnetic property of a sintered body is excellent: initial magnetic permeability (100kHz) is more than or equal to 450H/m, and resistivity is more than or equal to 109 omega cm.
CN103951403B discloses a low-temperature matching co-firing method of a non-magnetic material and a NiCuZn ferrite material. The method comprises the following steps of 1: preparing a NiCuZn ferrite material, and preparing a nonmagnetic material with the same spinel structure as the NiCuZn ferrite; step 2: and manufacturing the required electronic component by adopting an LTCC sintering process for the NiCuZn ferrite material and the nonmagnetic material through casting, wet forming, printing, isostatic pressing, cutting, binder removal, sintering, silver coating and electroplating. The invention realizes the matching co-firing of the heterogeneous material without introducing a third material or changing the formula of the slurry; meanwhile, the non-magnetic material has little influence on the electromagnetic performance of the ferrite material and can be used as an effective air gap layer material. The method has the characteristics of simplicity, good operability, low price, obvious effect and the like, and can be widely applied to the LTCC technology for manufacturing various electronic components.
CN106633547A discloses a Z-type ferrite flake powder/PVDF wave-absorbing composite material and a preparation method thereof, PVDF powder is added into acetone to be dissolved to obtain PVDF solution, and then Ba with orientation in the (001) direction is added3Co2Fe24O41Uniformly mixing the flaky powder to obtain composite slurry; casting the composite slurry to obtain Z? The ferrite flake powder/PVDF wave-absorbing composite material. The invention adopts the casting process, the material is uniformly dispersed, the thickness of the film is uniform, and the casting slurry used for preparation is nontoxic and can not cause harm to human bodies. The invention has the advantages of simple equipment, stable process, continuous operation, high production efficiency, high automation, low cost, good material compactness and uniformity and simple preparation method.
CN107266062A discloses an anisotropic Co2Z-type hexagonal ferrite core and its preparing process, mainly comprising BaCO3、Co2O3、Fe2O3Is prepared from three raw materials, and the structural formula of the three raw materials is 3 BaO.2CoO.12Fe2O3. The preparation method comprises the following steps: weighing raw materials according to a stoichiometric proportion, drying, crushing and sieving the obtained materials after ball milling and mixing; pre-burning the sieved materials, adding a sintering aid, and then performing secondary ball milling and mixing; mixing the secondary ball-milling material with PVB solution, plasticizer and dispersant to prepare casting slurry; casting on a PET film, and carrying out horizontal orientation in a magnetic field to obtain a casting sheet with consistent orientation; stamping the casting sheet, removing the excess glue, and sintering to obtain anisotropic Co2And a Z-type hexagonal ferrite core. The anisotropic Co2Z type hexagonal ferrite magnetic core prepared by the invention still has high magnetic conductivity and high quality factor at 1GHz, and can be used for preparing ultrahigh frequency chip inductors.
CN107216136A discloses a method for preparing a wireless charger ferrite magnetic sheet from soft magnetic waste, in particular to a method for preparing a wireless charger ferrite magnetic sheet from soft magnetic waste; comprises (1) the ingredient reaction materials comprise manganese-zinc waste magnetic cores (MnZnFeO) calculated according to the mass percentage3) Waste nickel-zinc magnetic cores: (NiZnFeO3)，SiO2，Bi2O3，V2O5，CuO，ZnO2Adding water, ball milling, sieving, (2) casting and pulping: powder, deionized water, PVA, PAA, PEG, PVB, latex, ball milling in a roller ball mill, (3) tape casting: forming a green body by the casting slurry on a casting machine, (4) discharging: discharging glue from the formed green body in a resistance furnace, (5) sintering: sintering the material blank subjected to binder removal in a bell jar furnace in a reducing atmosphere, (6) pasting a film, and (7) performing porcelain crushing; the method for preparing the ferrite magnetic sheet of the wireless charger by using the soft magnetic waste has the advantages of low cost, energy conservation, environmental protection and excellent product performance.
However, none of the above solutions provides a method for efficiently and rapidly determining whether the slurry meets the casting requirements, and also provides a method for positioning the thickness of the cast green sheet in one step, and therefore, it is important to develop a method capable of meeting the above requirements in the art.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a method for determining the casting condition of ferrite slurry. The method provided by the invention can obtain the ferrite green tape with qualified thickness at one time.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a method for determining the casting condition of ferrite slurry, which comprises the following steps:
(1) manually coating the ferrite slurry, and judging whether the ferrite slurry meets the casting requirement;
(2) setting different blade pitches for the ferrite slurry meeting the casting requirement, manually coating, measuring the thickness of the ferrite green sheet obtained by manual coating, and obtaining the relation between the blade pitch of the ferrite slurry of the batch in the step (1) and the thickness of the obtained ferrite green sheet;
(3) and (3) determining the scraper spacing of a casting machine required when the casting machine is used for casting the ferrite slurry meeting the casting requirement in the step (2) according to the corresponding relation obtained in the step (2) and the required thickness of the ferrite green sheet.
The method provided by the invention firstly determines whether the slurry is qualified through manual coating, then roughly determines the distance between a doctor blade of a casting machine and a film belt required when the ferrite green sheet is cast in a large-scale formal manner by a similar casting machine through the corresponding relation between the distance between the doctor blade of a tool used for manual coating and the film belt and the thickness of the ferrite green sheet obtained through manual coating, and obtains the ferrite green sheet with qualified size.
In the present invention, the correspondence between the step (2) and the step (3) is the correspondence between the blade pitch and the thickness of the ferrite green sheet for the slurry judged to meet the casting requirements. For example, for a nickel-copper-zinc slurry meeting the casting requirements, the blade pitch is 212 μm and the thickness of the ferrite green sheet is 138 μm.
The following is a preferred technical solution of the present invention, but not a limitation to the technical solution provided by the present invention, and the technical objects and advantageous effects of the present invention can be better achieved and achieved by the following preferred technical solution.
As a preferable technical solution of the present invention, in the step (1), the ferrite slurry includes any one of a nickel-zinc ferrite slurry, a manganese-zinc ferrite slurry, or a nickel-zinc-copper ferrite slurry.
As a preferred technical scheme of the invention, the ferrite slurry is prepared by the following method:
and mixing the ferrite pre-sintering powder, a binder, a dispersant, a plasticizer and a solvent to obtain the ferrite slurry.
In the present invention, the types of the ferrite pre-sintering powder, the binder, the dispersant, the plasticizer and the solvent are all common in the prior art in the field, and can be selected by those skilled in the art according to actual situations. For example, a mixed powder of iron oxide, nickel oxide, copper oxide and manganese oxide may be used as the calcined powder, a common dispersant such as polyvinyl alcohol may be used as the binder, a common solvent such as ethanol may be used as the dispersant, a common plasticizer such as dioctyl phthalate (DOP) may be used as the plasticizer, and a common solvent such as water may be used as the solvent.
Preferably, the method of mixing is stirring mixing.
As a preferable technical solution of the present invention, in the step (1) and the step (2), the manual coating method is to coat the slurry on the film tape by using a manual coater;
preferably, the manual coating is uniform-speed coating;
preferably, the film tape is a polyethylene terephthalate film tape.
As a preferable technical solution of the present invention, in the step (1), the method for determining whether the ferrite slurry meets the casting requirement includes: if no particles exist and no cracking is observed after the slurry which is coated on the film belt in a test way is dried, the slurry meets the casting requirement; if the slurry coated on the film belt is dried and the existence or cracking of particles is observed, the slurry does not meet the casting requirement;
preferably, the observation is a visual observation.
In a preferred embodiment of the present invention, in the step (2), the blade pitch is 0.1 to 1mm, for example, 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm or 1mm, but is not limited to the above-mentioned values, and other values not listed in the above-mentioned range are also applicable.
As a preferable embodiment of the present invention, the step (2) further includes: the viscosity of the slurry meeting the casting requirements was measured.
Preferably, step (2) further comprises: the density of the slurry meeting the casting requirements was determined.
Preferably, the density of the slurry meeting the casting requirement is determined by measuring the mass and volume of the slurry meeting the casting requirement and calculating the density of the slurry meeting the casting requirement.
Preferably, step (2) further comprises: and measuring the solid content of the slurry meeting the casting requirement.
Through the measurement of viscosity, density and solid content, the corresponding relation between the existing blade spacing and the thickness of the ferrite green sheet can be directly applied to other batches of ferrite slurry with the same physical properties.
As a preferable embodiment of the present invention, the step (2) further includes: the temperature of the slurry meeting the casting requirements was measured.
As a preferable technical solution of the present invention, in the step (3), the method further comprises: the temperature of the casting machine is determined according to the temperature of the slurry meeting the casting requirement measured in the step (2), and the operation temperature of the casting machine for casting delay is 1-2 ℃ lower than the temperature of the slurry meeting the casting requirement measured in the step (2), such as 1 ℃, 1.1 ℃, 1.2 ℃, 1.3 ℃, 1.4 ℃, 1.5 ℃, 1.6 ℃, 1.7 ℃, 1.8 ℃, 1.9 ℃ or 2 ℃, but not limited to the enumerated values, and other non-enumerated values in the numerical value range are also applicable.
As a further preferred technical solution of the method of the present invention, the method comprises the steps of:
(1) coating ferrite slurry on a polyethylene terephthalate film belt at a constant speed by using a manual coating device, wherein if no particles exist and do not crack after the slurry coated on the film belt is dried through visual observation, the slurry meets the casting requirement, and if the particles exist or crack after the slurry coated on the film belt is dried through visual observation, the slurry does not meet the casting requirement;
wherein the ferrite slurry is prepared by the following method: stirring and mixing ferrite pre-sintering powder, a binder, a dispersant, a plasticizer and a solvent to obtain ferrite slurry;
(2) for the slurry meeting the casting requirement, measuring the viscosity, density, solid content and temperature of the slurry, setting different blade pitches in the range of 0.1-1mm for manual coating, measuring the thickness of the ferrite green sheet obtained by the manual coating, and obtaining the relation between the blade pitch of the ferrite slurry of the batch in the step (1) and the thickness of the obtained ferrite green sheet;
the manual coating method comprises the steps of coating ferrite slurry on a polyethylene terephthalate film belt at a constant speed by using a manual coater;
(3) determining the scraper spacing of a casting machine required when the ferrite slurry meeting the casting requirement in the step (2) is cast by the casting machine according to the corresponding relation obtained in the step (2) and the required thickness of the ferrite green sheet, and determining the operation temperature for carrying out flow delay by the casting machine according to the temperature of the slurry meeting the casting requirement measured in the step (2), wherein the operation temperature is 1-2 ℃ lower than the temperature of the slurry meeting the casting requirement measured in the step (2).
Compared with the prior art, the invention has the following beneficial effects:
according to the method for judging whether the ferrite slurry meets the casting requirement and determining the casting condition, whether the ferrite slurry meets the casting requirement is determined through test coating, so that the slurry which does not meet the casting requirement can be reworked in advance, the unqualified slurry cannot enter the casting step to generate unqualified casting green sheets, and the working hours are not wasted; and determining the corresponding relation between the density, viscosity, solid content and the pitch of a casting scraper of qualified slurry and the thickness of the ferrite green sheet obtained by casting by test casting, and determining the pitch of the casting scraper according to the corresponding relation to obtain the ferrite green sheet with qualified size. The method provided by the invention solves the problem of efficiently and rapidly judging whether the slurry meets the casting requirement, and also solves the problem of how to make the casting green sheet size in place in one step, thereby ensuring that the qualified ferrite green sheet can be obtained.
Detailed Description
In order to better illustrate the present invention and facilitate the understanding of the technical solutions of the present invention, the present invention is further described in detail below. The following examples are merely illustrative of the present invention and do not represent or limit the scope of the claims, which are defined by the claims.
The following are typical but non-limiting examples of the invention:
example 1
The present embodiment adopts the following method to determine whether the ferrite slurry meets the casting requirement and determine the casting condition:
(1) coating ferrite slurry of a nickel-zinc ferrite green sheet with the frequency of 128KHz on a polyethylene terephthalate (PET) film belt in a manual mode at a constant speed, and observing no particles and no cracking by naked eyes after the slurry coated on the film belt is dried to meet the casting requirement;
wherein the ferrite slurry is prepared by the following method: stirring and mixing ferrite pre-sintering powder, 8 parts of PVB, 1 part of plasticizer, 0.5 part of dispersant and 50 parts of solvent in a ball mill for 18 hours, discharging by using a diaphragm pump after stirring, and transferring to a charging bucket to obtain ferrite slurry;
the manual coating method comprises pouring a small amount of slurry into a trough of a manual coating device, and uniformly and forwards pulling the slurry by hand to coat the slurry on a polyethylene terephthalate (PET) film tape with the thickness of 65mm by 15 mm;
(2) for the slurry meeting the casting requirement, measuring the viscosity, density, solid content and temperature of the slurry, setting the blade spacing to be 0.1mm, 0.2mm, 0.3mm and 0.4mm, carrying out manual coating (the manual coating method is that a manual coater is used for coating the ferrite slurry on a polyethylene terephthalate film tape at a constant speed), measuring the thickness of the ferrite green sheet obtained by manual coating, and obtaining the relation between the blade spacing of the ferrite slurry of the batch in the step (1) and the thickness of the obtained ferrite green sheet; the corresponding relation is shown in table 1;
the viscosity measuring method comprises the steps of taking 200ml of slurry from a charging bucket to test the viscosity of the slurry, and the density measuring method comprises the steps of taking a 100ml beaker, peeling and weighing the beaker on an electronic balance, adding the slurry to record the weight, and calculating the density according to the volume of the slurry.
(3) According to the corresponding relation obtained in the step (2), the required thickness of the ferrite green sheet is 138 μm, the distance between the doctor blades of the casting machine required when the ferrite slurry meeting the casting requirement in the step (2) is cast by the casting machine is determined to be about 0.2mm, finally the distance is determined to be 212 μm, the operation temperature of the casting machine for carrying out the flow delay is determined according to the temperature of the slurry meeting the casting requirement measured in the step (2), and the operation temperature is 1.5 ℃ lower than the temperature of the slurry meeting the casting requirement measured in the step (2). And (3) casting the slurry meeting the casting requirement in the step (1) by using a casting machine at the blade interval and the operation temperature to obtain the qualified ferrite green sheet.
TABLE 1
Example 2
The present embodiment adopts the following method to determine whether the ferrite slurry meets the casting requirement and determine the casting condition:
(1) coating ferrite slurry of a manganese-zinc ferrite green sheet with the frequency of 128KHz on a polyethylene terephthalate (PET) film belt in a manual mode at a constant speed, and observing no particles and no cracking by naked eyes after the slurry coated on the film belt is dried to meet the casting requirement;
wherein the ferrite slurry is prepared by the following method: stirring and mixing ferrite pre-sintering powder, 10 parts of PVB, 2 parts of plasticizer, 1 part of dispersant and 50 parts of solvent in a ball mill for 18 hours, discharging by using a diaphragm pump after stirring, and transferring to a charging bucket to obtain ferrite slurry;
the manual coating method comprises pouring a small amount of slurry into a trough of a manual coating device, pulling forward by hand at a constant speed, and coating a polyethylene terephthalate (PET) film strip;
(2) for the slurry meeting the casting requirement, measuring the viscosity, density, solid content and temperature of the slurry, setting the blade spacing to be 0.4mm, 0.5mm, 0.6mm and 0.7mm, carrying out manual coating (the manual coating method is that a manual coater is used for coating the ferrite slurry on a polyethylene terephthalate film tape at a constant speed), measuring the thickness of the ferrite green sheet obtained by manual coating, and obtaining the relation between the blade spacing of the ferrite slurry of the batch in the step (1) and the thickness of the obtained ferrite green sheet; the corresponding relation is shown in table 2;
the viscosity measuring method comprises the steps of taking 200ml of slurry from a charging bucket to test the viscosity of the slurry, and the density measuring method comprises the steps of taking a 100ml beaker, peeling and weighing the beaker on an electronic balance, adding the slurry to record the weight, and calculating the density according to the volume of the slurry.
(3) According to the corresponding relation obtained in the step (2), the required thickness of the ferrite green sheet is 200 μm, the blade spacing of a casting machine required when the ferrite slurry meeting the casting requirement in the step (2) is cast by the casting machine is determined to be about 0.5mm, finally, the blade spacing is determined to be 492 μm, the operation temperature of the casting machine for flow delay is determined according to the temperature of the slurry meeting the casting requirement measured in the step (2), and the operation temperature is 1 ℃ lower than the temperature of the slurry meeting the casting requirement measured in the step (2). And (3) casting the slurry meeting the casting requirement in the step (1) by using a casting machine at the blade interval and the operation temperature to obtain the qualified ferrite green sheet.
TABLE 2
Example 3
The present embodiment adopts the following method to determine whether the ferrite slurry meets the casting requirement and determine the casting condition:
(1) coating ferrite slurry of a nickel-copper-zinc ferrite green sheet with the preparation frequency of 13.56MHz on a polyethylene terephthalate (PET) film tape in a manual mode at a constant speed, and observing the slurry coated on the film tape by naked eyes after the slurry is dried to ensure that no particles exist and no cracking exists, thereby meeting the casting requirement;
wherein the ferrite slurry is prepared by the following method: stirring and mixing ferrite pre-sintering powder, 3 parts of PVB, 0.5 part of plasticizer, 0.1 part of dispersant and 50 parts of solvent in a ball mill for 18 hours, discharging by using a diaphragm pump after stirring is finished, and transferring to a charging bucket to obtain ferrite slurry;
the manual coating method comprises pouring a small amount of slurry into a trough of a manual coating device, pulling forward by hand at a constant speed, and coating a polyethylene terephthalate (PET) film strip;
(2) for the slurry meeting the casting requirement, measuring the viscosity, density, solid content and temperature of the slurry, setting the blade pitch to be 0.7mm, 0.8mm, 0.9mm and 1mm, carrying out manual coating (the manual coating method is that a manual coater is used for coating the ferrite slurry on a polyethylene terephthalate film tape at a constant speed), measuring the thickness of the ferrite green sheet obtained by manual coating, and obtaining the relation between the blade pitch of the ferrite slurry of the batch in the step (1) and the thickness of the obtained ferrite green sheet; the corresponding relation is shown in table 3;
the viscosity measuring method comprises the steps of taking 200ml of slurry from a charging bucket to test the viscosity of the slurry, and the density measuring method comprises the steps of taking a 100ml beaker, peeling and weighing the beaker on an electronic balance, adding the slurry to record the weight, and calculating the density according to the volume of the slurry.
(3) According to the corresponding relation obtained in the step (2), the required thickness of the ferrite green sheet is 215 μm, the distance between the scraper blades of the casting machine required when the ferrite slurry meeting the casting requirement in the step (2) is cast by the casting machine is determined to be about 0.7mm, finally the distance is determined to be 715 μm, the operation temperature of the casting machine for flow delay is determined according to the temperature of the slurry meeting the casting requirement measured in the step (2), and the operation temperature is 2 ℃ lower than the temperature of the slurry meeting the casting requirement measured in the step (2). And (3) casting the slurry meeting the casting requirement in the step (1) by using a casting machine at the blade interval and the operation temperature to obtain the qualified ferrite green sheet.
TABLE 3
It can be known from the above embodiments that the method provided by the present invention solves the problem of efficiently and rapidly determining whether the slurry meets the casting requirement, and also solves the problem of how to make the size of the cast green sheet in place in one step, so as to ensure that a qualified ferrite green sheet can be obtained.
The applicant states that the present invention is illustrated in detail by the above examples, but the present invention is not limited to the above detailed methods, i.e. it is not meant that the present invention must rely on the above detailed methods for its implementation. It should be understood by those skilled in the art that any modification of the present invention, equivalent substitutions of the raw materials of the product of the present invention, addition of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.
Claims (10)
1. A method of determining casting conditions of a ferrite slurry, comprising the steps of:
(1) manually coating the ferrite slurry, and judging whether the ferrite slurry meets the casting requirement;
(2) setting different blade pitches for the ferrite slurry meeting the casting requirement, manually coating, measuring the thickness of the ferrite green sheet obtained by manual coating, and obtaining the relation between the blade pitch of the ferrite slurry of the batch in the step (1) and the thickness of the obtained ferrite green sheet;
(3) and (3) determining the scraper spacing of a casting machine required when the casting machine is used for casting the ferrite slurry meeting the casting requirement in the step (2) according to the corresponding relation obtained in the step (2) and the required thickness of the ferrite green sheet.
2. The method according to claim 1, wherein in step (1), the ferrite slurry comprises any one of a nickel zinc ferrite slurry, a manganese zinc ferrite slurry or a nickel zinc copper ferrite slurry.
3. The method of claim 1 or 2, wherein the ferrite slurry is prepared by:
mixing ferrite pre-sintering powder, a binder, a dispersant, a plasticizer and a solvent to obtain ferrite slurry;
preferably, the method of mixing is stirring mixing.
4. The method according to any one of claims 1 to 3, wherein in the step (1) and the step (2), the manual coating method is to coat the slurry on the film strip by using a manual coater;
preferably, the manual coating is uniform-speed coating;
preferably, the film tape is a polyethylene terephthalate film tape.
5. The method according to any one of claims 1 to 4, wherein in the step (1), the method for determining whether the ferrite slurry meets the casting requirement is as follows: if no particles exist and no cracking is observed after the slurry which is coated on the film belt in a test way is dried, the slurry meets the casting requirement; if the slurry coated on the film belt is dried and the existence or cracking of particles is observed, the slurry does not meet the casting requirement;
preferably, the observation is a visual observation.
6. The method according to any one of claims 1 to 5, wherein in step (2), the blade pitch is 0.1 to 1 mm.
7. The method according to any one of claims 1 to 6, wherein in the step (2), further comprising: measuring the viscosity of the slurry meeting the casting requirement;
preferably, step (2) further comprises: measuring the density of the slurry meeting the casting requirement;
preferably, the method for determining the density of the slurry meeting the casting requirement is to measure the mass and the volume of the slurry meeting the casting requirement and calculate the density of the slurry meeting the casting requirement;
preferably, step (2) further comprises: and measuring the solid content of the slurry meeting the casting requirement.
8. The method according to any one of claims 1-7, wherein in step (2), further comprising: the temperature of the slurry meeting the casting requirements was measured.
9. The method of claim 8, wherein step (3) further comprises: and (3) determining the operation temperature of the casting machine for carrying out casting delay according to the temperature of the slurry meeting the casting requirement measured in the step (2), wherein the operation temperature is 1-2 ℃ lower than the temperature of the slurry meeting the casting requirement measured in the step (2).
10. Method according to any of claims 1-9, characterized in that the method comprises the steps of:
(1) coating ferrite slurry on a polyethylene terephthalate film belt at a constant speed by using a manual coating device, wherein if no particles exist and do not crack after the slurry coated on the film belt is dried through visual observation, the slurry meets the casting requirement, and if the particles exist or crack after the slurry coated on the film belt is dried through visual observation, the slurry does not meet the casting requirement;
wherein the ferrite slurry is prepared by the following method: stirring and mixing ferrite pre-sintering powder, a binder, a dispersant, a plasticizer and a solvent to obtain ferrite slurry;
(2) for the slurry meeting the casting requirement, measuring the viscosity, density, solid content and temperature of the slurry, setting different blade pitches in the range of 0.1-1mm for manual coating, measuring the thickness of the ferrite green sheet obtained by the manual coating, and obtaining the relation between the blade pitch of the ferrite slurry of the batch in the step (1) and the thickness of the obtained ferrite green sheet;
the manual coating method comprises the steps of coating ferrite slurry on a polyethylene terephthalate film belt at a constant speed by using a manual coater;
(3) determining the scraper spacing of a casting machine required when the ferrite slurry meeting the casting requirement in the step (2) is cast by the casting machine according to the corresponding relation obtained in the step (2) and the required thickness of the ferrite green sheet, and determining the operation temperature for carrying out flow delay by the casting machine according to the temperature of the slurry meeting the casting requirement measured in the step (2), wherein the operation temperature is 1-2 ℃ lower than the temperature of the slurry meeting the casting requirement measured in the step (2).
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