CN109704744B - RX end ferrite material and magnetic sheet for wireless charging and manufacturing method thereof - Google Patents
RX end ferrite material and magnetic sheet for wireless charging and manufacturing method thereof Download PDFInfo
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Abstract
The invention discloses an RX end ferrite material and a magnetic sheet for wireless charging and a manufacturing method thereof, wherein the formula of the RX end ferrite material for wireless charging comprises main components and additive components, and the main components comprise the following components in percentage by weight: 66.0 wt% -66.5 wt% of Fe2O35.5 to 6.1 weight percent of NiO, 21.3 to 22.0 weight percent of ZnO and 6.0 to 6.5 weight percent of CuO; the additive component comprises SiO2、Co2O3、MoO3、CaCO3Wherein the percentage of each component in the total weight of the main component is respectively as follows: 0.02 wt% -0.10 wt% of SiO20.02 wt% -0.10 wt% of Co2O3、0.02wt％～0.10wt％d MoO30.01 to 0.10 weight percent of CaCO3. The invention can prepare the magnetic material with higher magnetic conductivity mu i and lower power loss PcvAnd a higher saturation magnetic flux density BsThe nickel zinc ferrite is applied to wireless charging equipment, and plays a role in improving charging performance.
Description
Technical Field
The invention relates to the technical field of ferrite materials, in particular to an RX end ferrite material and a magnetic sheet for wireless charging and a manufacturing method thereof.
Background
With the wide use of portable electronic products such as smart phones, wearable watches, digital cameras, tablet computers and the like, people have higher and higher requirements for charging; especially, smart phones have powerful functions, rich software and high use frequency, which results in very large power consumption and short standby time of the smart phones, and the smart phones must be charged repeatedly, and the special wired chargers are inconvenient to carry, and have the danger of electric leakage and electric shock during charging, thus being very troublesome in practice. And each electronic product has a special charger, if the user changes the electronic product, the charger becomes electronic garbage, which wastes resources and pollutes the environment.
When adopting wireless charging equipment to charge for electronic product, do not have the wire between electronic product and the wireless charging equipment to connect, can put and fill promptly, can take away the use at any time again, do not have the restriction of traditional connecting wire, charge convenient, nimble to can charge for a plurality of electronic product simultaneously, this makes wireless charging equipment more and more receives people's attention.
At present, the charging technology of more and more portable electronic products gradually advances to tailless (non-contact charging), and the wireless charging technology develops rapidly. According to different design principles and mechanisms, the implementation modes of wireless charging can be divided into three types according to different application frequency bands: the low frequency is electromagnetic induction coupling type, the medium-high frequency is electromagnetic resonance type, and the higher frequency is electromagnetic radiation type. Charging by electromagnetic induction (Qi standard) is most common. In the situation of quick charging or large-current charging, as the transmitting coil and the receiving coil are separated, when the system works, leakage inductance is generated, the mutual inductance of the coils is reduced, and further the conversion efficiency is reduced; there are also problems with electromagnetic radiation and the like. In order to solve the above problems, it is necessary to shield the magnetic flux generated by the coil with a magnetically conductive shielding material, and when ferrite materials are added to the transmitting coil end and the receiving coil end as shielding materials, respectively, the coupling coefficient between the coils can be improved, thereby improving the transmission efficiency. The electromagnetic induction coupling type wireless charging technology mainly utilizes a transformer theory and an electromagnetic induction law. The transmitting end is powered by mains supply, alternating current is converted into a magnetic field through a transmitting end coil (equivalent to a primary coil of a transformer), the electric energy can be transmitted through air, and after the receiving end coil (equivalent to a secondary coil of the transformer) receives the magnetic field, current can be generated at the receiving end due to electromagnetic induction, so that power transmission at two ends is achieved.
At present, two main shielding materials of amorphous nanocrystals and ferrite exist in the market, the amorphous nanocrystals have the advantages of high magnetic permeability and high saturation magnetic induction, but the complexity of a lamination process is limited, the manufacturing cost is high, and the ferrite sheet is still the first choice in the market at present, so that the preparation of the ferrite material suitable for wireless charging becomes one of the development directions in the field.
The above background disclosure is only for the purpose of assisting understanding of the concept and technical solution of the present invention and does not necessarily belong to the prior art of the present patent application, and should not be used for evaluating the novelty and inventive step of the present application in the case that there is no clear evidence that the above content is disclosed at the filing date of the present patent application.
Disclosure of Invention
In order to solve the technical problems, the invention provides an RX end ferrite material and a magnetic sheet for wireless charging and a manufacturing method thereof, and the RX end ferrite material and the magnetic sheet have high magnetic conductivity mu i and low power loss PcvAnd a higher saturation magnetic flux density BsThe nickel zinc ferrite is applied to wireless charging equipment, and plays a role in improving charging performance.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention discloses an RX end ferrite material for wireless charging, which comprises a main component and an additive component, wherein the main component comprises Fe2O3NiO, ZnO and CuO, wherein the total weight of the components is 100 wt%:
the additive component comprises SiO2、Co2O3、MoO3、CaCO3Wherein the percentage of each component in the total weight of the main component is respectively as follows:
preferably, each component of the main component and the additive component is a high-purity raw material, and the purity is as follows: fe2O3≥99.5wt％，NiO≥99.5wt％，ZnO≥99wt％，CuO≥99wt％，SiO2≥99wt％，Co2O3≥99wt％，MoO3≥99.5wt％，CaCO3≥99wt％。
One embodiment of the invention discloses a method for manufacturing an RX end ferrite material for wireless charging, which comprises the following steps:
s1: weighing the raw material Fe according to the formula of the RX end ferrite material for wireless charging2O3、NiO、ZnO、CuO、SiO2、Co2O3、MoO3、CaCO3；
S2: putting the raw materials of the main components weighed in the step S1 into a sand mill, and performing ball milling to prepare slurry;
s3: drying the slurry obtained in the step S2 to obtain powder;
s4: pre-burning the powder obtained in the step S3 to prepare pre-burned powder;
s5: putting the pre-sintered powder obtained in the step S4 into a ball mill, and then putting the raw materials of the additive components weighed in the step S1 into the ball mill for ball milling to prepare slurry;
s6: and (4) drying the slurry obtained in the step (S5) to obtain the RX end ferrite material for wireless charging.
Preferably, the ball milling step in step S2 specifically includes: according to the reference: ball: the water mass ratio is 1: 4: 1.5, adding zirconia balls with the diameter of 1-5 mm and deionized water into a sand mill tank, setting the rotation speed of the sand mill to be 200-250 rpm, carrying out ball milling for 4-10 h, and controlling the particle size of powder to be 1.0 +/-0.2 mu m when D50 is equal to 1.0 mu m to prepare slurry; the ball milling step in step S5 specifically includes: according to the reference: ball: the water mass ratio is 1: 4: and 1.5, adding zirconia balls with the diameter of 1-5 mm and deionized water into a ball mill tank, setting the rotating speed of the ball mill to be 200-250 rpm, and controlling the powder granularity to be 1.0 mu m +/-0.2 mu m after ball milling for 1-4 h to prepare the slurry.
Preferably, the drying step in step S3 specifically includes: drying the slurry obtained in the step S2 in an oven, wherein the temperature of the oven is set to be 100-200 ℃, and the time is 10-24 h; the drying step in step S6 specifically includes: and (5) drying the slurry obtained in the step (S5) in an oven, wherein the temperature of the oven is set to be 100-200 ℃, and the time is 10-24 h.
Preferably, the step of pre-burning in step S4 specifically includes: and (5) placing the powder obtained in the step (S3) in a high-temperature sintering furnace for presintering, setting the temperature to be 800-850 ℃, setting the heating rate to be 1-4 ℃/min, preserving the heat for 2-4 h, and then naturally cooling.
The embodiment of the invention discloses an RX end ferrite material for wireless charging, which is prepared by adopting the preparation method.
One embodiment of the invention discloses a method for manufacturing an RX end magnetic sheet for wireless charging, which comprises the following steps:
including steps S1-S6 in the method for manufacturing the RX terminal ferrite material for wireless charging, and
s7: preparing the magnetic sheet from the RX end ferrite material for wireless charging obtained in the step S6 by adopting dry casting;
s8: and (4) sintering the magnetic sheet obtained in the step (S7) to obtain the RX end magnetic sheet for wireless charging.
Preferably, the sintering step in step S8 specifically includes:
a temperature rising stage: heating the temperature from room temperature to 400-500 ℃ at a heating rate of 0.1-1.0 ℃/min, keeping the temperature for 2-5 h, after the binder is discharged, continuously heating to 800-900 ℃ at a heating rate of 1.0-2.0 ℃/min, and keeping the temperature for 1-3 h;
and (3) a blank gradual shrinkage stage: continuously heating to 920-1000 ℃ at the heating rate of 0.5-1.5 ℃/min;
and (3) a heat preservation stage: preserving the heat for 1 to 4 hours at the temperature of 920 to 1000 ℃;
and (3) cooling: after the sintering, the temperature is reduced, and the cooling rate is 0.5 ℃/min to 2.0 ℃/min.
The embodiment of the invention discloses an RX end magnetic sheet for wireless charging, which is manufactured by adopting the manufacturing method.
Compared with the prior art, the invention has the beneficial effects that: the invention discloses an RX terminal (for wireless charging)Receiving port) ferrite material and magnetic sheet, and a method for manufacturing the same, the ferrite material having a large resistivity, being capable of being sintered in air, and having a low sintering temperature and a simple process. Therefore, the magnetic material has high magnetic permeability mu i and low power loss PcvAnd a higher saturation magnetic flux density BsThe nickel zinc ferrite is applied to wireless charging equipment, and plays a role in improving charging performance. In particular, the ferrite material has the following advantages: (1) the magnetic material has high magnetic permeability mu i, and the initial magnetic permeability mu i is 1800-2500 in a frequency interval of 10 KHz-200 KHz; (2) having a high saturation magnetic flux density BsSaturation magnetic flux density B ofsCan reach 360mT, and the saturation magnetic flux density B of the ferrite powder of the same kindsWithin 280 mT; (3) with low power consumption PcvThe power consumption of the powder is 200KW/m at 50KHz/150mT/25 DEG C3Within, and the power consumption of the same kind of ferrite powder is 200KW/m3The above; (4) the sintering efficiency is high, the magnetic conductivity of the magnetic sheet is stabilized within +/-10 percent, the multi-sheet stacking sintering can be realized, the sintering efficiency is improved, and the cost is reduced; (5) the conversion efficiency is high, in the aspect of efficiency conversion, the conversion efficiency of the magnetic sheet made of the ferrite powder is 85.4-86.5 percent, and the conversion efficiency of the magnetic sheet made of the similar ferrite powder is about 85.0 percent; (6) coercive force Hc<25A/m。
Furthermore, in the aspect of raw material selection, all raw materials are high-purity materials, so that the introduction of impurities is avoided as much as possible, and the quality of the raw materials is ensured; in the aspect of the formula, a special sintering aid (MoO) is adopted3) The microstructure is compact, and the crystal grains are fine and uniform. The formulation was also monitored and each batch was tested for composition, and if deviations occurred, compensated for. In the aspect of grinding materials, zirconia balls and polyurethane lining are adopted for ball milling, so that metal Fe impurities are not easily mixed to cause over-iron of material components, and more Fe is easily used in formula design2O3Thereby obtaining a higher magnetic permeability. In the aspect of process manufacturing, each batch is subjected to particle size testing, so that the particle size is controlled within a specified range; under the granularity, the powder has good activity and can be effectively sintered.
Drawings
Fig. 1 is a flowchart of a method for manufacturing an RX end ferrite material for wireless charging according to a preferred embodiment of the present invention;
fig. 2 is a flowchart of a method for manufacturing an RX side magnetic sheet for wireless charging according to a preferred embodiment of the present invention;
FIG. 3 is a microstructure of a magnetic sheet made according to examples of the present invention;
fig. 4 is a microstructure of a magnetic sheet of a conventional material.
Detailed Description
The invention will be further described with reference to the accompanying drawings and preferred embodiments.
The invention discloses a formula of an RX end ferrite material for wireless charging, which comprises a main component and an additive component, wherein the main component comprises Fe2O3NiO, ZnO and CuO, wherein the total weight of the components is 100 wt%:
the additive component comprises SiO2、Co2O3、MoO3、CaCO3Wherein the percentage of each component in the total weight of the main component is respectively as follows:
wherein, the main components and the additive components are high-purity raw materials, and the purity is respectively as follows: fe2O3≥99.5wt％，NiO≥99.5wt％，ZnO≥99wt％，CuO≥99wt％，SiO2≥99wt％，Co2O3≥99wt％，MoO3≥99.5wt％，CaCO3≥99wt％。
As shown in fig. 1, a preferred embodiment of the present invention provides a method for manufacturing an RX end ferrite material for wireless charging, including the following steps:
s1: raw material Fe is weighed according to the formula2O3、NiO、ZnO、CuO、SiO2、Co2O3、MoO3、CaCO3For standby;
s2: putting the main component raw materials weighed in the step S1 into a sand mill, and mixing the raw materials in the following ratio: ball: the water mass ratio is 1: 4: 1.5, adding zirconia balls with the diameter of 1-5 mm and deionized water into a sand mill tank, setting the rotation speed of the sand mill to be 200-250 rpm, carrying out ball milling for 4-10 h, and controlling the particle size of powder to be 1.0 +/-0.2 mu m when D50 is equal to 1.0 mu m to prepare slurry;
s3: drying the slurry obtained in the step S2 in an oven, wherein the temperature of the oven is set to be 100-200 ℃, and the time is 10-24 h;
s4: placing the powder obtained in the step S3 in a high-temperature sintering furnace for presintering, setting the temperature to be 800-850 ℃, setting the heating rate to be 1-4 ℃/min, preserving the heat for 2-4 h, and then naturally cooling;
s5: placing the pre-sintering powder prepared in the step S4 into a ball mill pot, adding an additive according to a formula, operating according to the step S2, performing ball milling for 1-4 h, and controlling the particle size of the powder to be D50 to be 1.0 mu m +/-0.2 mu m to prepare slurry;
s6: and (5) operating the slurry obtained by ball milling in the step S5 according to the step S3, and drying the powder to obtain the RX end ferrite material for wireless charging.
Wherein, the performance evaluation of the RX end ferrite material for wireless charging manufactured in step S6 includes the following steps:
adding 1-2 wt% of a binder with a solid content of 10% into the RX end ferrite material for wireless charging obtained in the step S6, uniformly mixing, granulating, pressing the granulated powder into a ring shape, wherein the thickness is 3-4 mm, the inner diameter is 8.5-9 mm, the outer diameter is 13-15 mm, the molding pressure is 3-5T, and the pressure maintaining time is 2-5S; the binder may be polyvinyl alcohol PVA 1788.
Sintering the pressed annular ferrite material in a high-temperature sintering furnace at 920-1000 ℃ in natural air; further, the sintering step includes:
a temperature rising stage: slowly heating, slowly heating to 400-500 ℃ from room temperature at a heating rate of 0.1-1.0 ℃/min, keeping the temperature for 2-5 h, continuously heating to 800-900 ℃ at a heating rate of 1.0-2.0 ℃/min after the binder is discharged, and keeping the temperature for 1-3 h;
and (3) a blank gradual shrinkage stage: continuously heating to 920-1000 ℃ at the heating rate of 0.5-1.5 ℃/min;
and (3) a heat preservation stage: preserving the heat for 1 to 4 hours at the temperature of 920 to 1000 ℃;
and (3) cooling: after the sintering, the temperature is reduced, and the cooling rate is 0.5 ℃/min to 2.0 ℃/min.
As shown in fig. 2, another preferred embodiment of the present invention provides a method for manufacturing an RX end magnetic sheet for wireless charging, including the steps of:
the above steps S1 to S6, and
s7: manufacturing magnetic sheets by using a dry casting technology for the RX end ferrite material for wireless charging manufactured in the step S6, wherein the magnetic sheets can be round, square, rectangular, oval, runway-shaped and the like;
s8: sintering the magnetic sheet prepared in the step S7 in a high-temperature sintering furnace at 920-1000 ℃ in natural air; further, the sintering step includes:
a temperature rising stage: slowly heating, slowly heating to 400-500 ℃ from room temperature at a heating rate of 0.1-1.0 ℃/min, keeping the temperature for 2-5 h, continuously heating to 800-900 ℃ at a heating rate of 1.0-2.0 ℃/min after the binder is discharged, and keeping the temperature for 1-3 h;
and (3) a blank gradual shrinkage stage: continuously heating to 920-1000 ℃ at the heating rate of 0.5-1.5 ℃/min;
and (3) a heat preservation stage: preserving the heat for 1 to 4 hours at the temperature of 920 to 1000 ℃;
and (3) cooling: after the sintering, the temperature is reduced, and the cooling rate is 0.5 ℃/min to 2.0 ℃/min.
In the above-described manufacturing method, among others, sintering directly determines the final composition, phase distribution, grain size, compactness, size, appearance and properties of the ferrite material and the magnetic sheet. The sintering process includes the steps that proper sintering temperature and sintering curve are determined according to different aspects of sintering equipment, pre-sintering temperature, shrinkage of pre-sintering materials, types and adding proportions of binders, product performance requirements, shapes and sizes, blank loading weight and modes and the like, the temperature rising stage in the preferable scheme obtained by the inventor on the basis of a large number of experiments mainly includes the volatilization process of moisture and the binders in blanks, the temperature rising stage needs to be slowly raised to avoid the blanks from cracking, the blank gradually shrinks, and the temperature rising rate needs to be proper as the sintering process influences the size, uniformity, porosity, distribution and the like of magnetic core grains; after reaching the highest sintering temperature, keeping the temperature for 1 to 4 hours; in the cooling stage, the cooling rate also has great influence on the electromagnetic performance and the qualification rate of the product. Through the preferable sintering process, the product has almost no adhesion, deformation and cracking, and the product has consistent external dimension and performance.
The invention is further illustrated by the following more specific examples.
Example 1
An RX terminal nickel-zinc ferrite material for wireless charging is prepared by dividing a formula into a main component and an additive component; the main components are as follows according to the weight of oxides:
the additive is SiO2、Co2O3、MoO3、CaCO3The components of the paint comprise the following components in percentage by weight:
the main components of the raw materials and the additive components are high-purity raw materials, and the purity is Fe2O3≥99.5wt％，NiO≥99.5wt％，ZnO≥99wt％，CuO≥99wt％，SiO2≥99wt％，Co2O3≥99wt％，MoO3≥99.5wt％，CaCO3≥99wt％。
A manufacturing method of an RX terminal nickel zinc ferrite material for wireless charging comprises the following steps:
step 1, weighing raw material Fe according to a formula2O3、NiO、ZnO、CuO、SiO2、Co2O3、MoO3、CaCO3For standby;
step 2, putting the main component raw materials weighed in the step 1 into a sand mill, and mixing the raw materials in parts by weight: ball: the water mass ratio is 1: 4: 1.5, adding zirconia balls with the diameter of 1mm and deionized water into a sand mill tank, setting the rotation speed of the sand mill to be 200rpm, and after ball milling for 10 hours, controlling the particle size of powder to be 1.0 μm when D50 is obtained, thus preparing slurry;
step 3, drying the slurry obtained in the step 2 in an oven, wherein the temperature of the oven is set to be 150 ℃, and the time is 15 hours;
step 4, placing the powder obtained in the step 3 in a high-temperature sintering furnace for presintering, setting the temperature to be 830 ℃, setting the heating rate to be 1.5 ℃/min, preserving the heat for 3 hours and then naturally cooling;
step 5, placing the pre-sintering powder prepared in the step 4 into a ball mill pot, adding an additive according to a formula, operating according to the step 2, carrying out ball milling for 2 hours, and controlling the particle size of the powder to be 1.0 mu m when D50 is obtained, so as to prepare slurry;
step 6, operating the slurry obtained by ball milling in the step 5 according to the step 3, and drying the powder for later use;
and 7, evaluating the performance of the powder prepared in the step 6. Adding 1.5 wt% of a binder with a solid content of 10% into the powder obtained in the step 6, uniformly mixing, granulating, pressing the granulated powder into a ring shape, wherein the thickness is 3.5mm, the inner diameter is 9.0mm, the outer diameter is 14.7mm, the forming pressure is 3.5T, and the pressure maintaining time is 3 s;
and 8, sintering the annular ferrite material pressed in the step 7 in a high-temperature sintering furnace at the sintering temperature of 960 ℃, wherein the sintering comprises the following steps:
a temperature rising stage: slowly heating, slowly heating from room temperature to 450 ℃ at a heating rate of 0.2 ℃/min, keeping the temperature for 3h, continuously heating to 830 ℃ at a heating rate of 1.5 ℃/min after the binder is discharged, and keeping the temperature for 2 h;
and (3) a blank gradual shrinkage stage: continuously heating to 960 ℃ at the heating rate of 1.0 ℃/min;
and (3) a heat preservation stage: keeping the temperature at 960 ℃ for 2 h;
and (3) cooling: after firing, the temperature is reduced, and the cooling rate is 1.5 ℃/min.
The prepared RX end nickel-zinc ferrite material for wireless charging is used for producing an RX end magnetic sheet for wireless charging by a dry casting technology, and comprises the following steps:
step 1, weighing raw material Fe according to a formula2O3、NiO、ZnO、CuO、SiO2、Co2O3、MoO3、CaCO3For standby;
step 2, putting the main component raw materials weighed in the step 1 into a sand mill, and mixing the raw materials in parts by weight: ball: the water mass ratio is 1: 4: 1.5, adding zirconia balls with the diameter of 1mm and deionized water into a sand mill tank, setting the rotation speed of the sand mill to be 200rpm, and after ball milling for 10 hours, controlling the particle size of powder to be 1.0 μm when D50 is obtained, thus preparing slurry;
step 3, drying the slurry obtained in the step 2 in an oven, wherein the temperature of the oven is set to be 150 ℃, and the time is 15 hours;
step 4, placing the powder obtained in the step 3 in a high-temperature sintering furnace for presintering, setting the temperature to be 830 ℃, setting the heating rate to be 1.5 ℃/min, preserving the heat for 3 hours and then naturally cooling;
step 5, placing the pre-sintered powder prepared in the step 4 into a ball mill pot, adding an additive according to a formula, operating according to the step 2, performing ball milling for 1.5h, and controlling the particle size of the powder to be 1.0 mu m when D50 is set, so as to prepare slurry;
step 6, operating the slurry obtained by ball milling in the step 5 according to the step 3, and drying the powder for later use;
step 7, manufacturing magnetic sheets by using the powder prepared in the step 6 by using a dry-process tape casting technology, wherein the magnetic sheets can be round, square, rectangular, oval, racetrack-shaped and the like;
step 8, placing the magnetic sheet manufactured in the step 7 in a high-temperature sintering furnace for sintering, wherein the sintering temperature is 960 ℃, and the sintering comprises the following steps:
a temperature rising stage: slowly heating, slowly heating from room temperature to 450 ℃ at a heating rate of 0.2 ℃/min, keeping the temperature for 3h, continuously heating to 830 ℃ at a heating rate of 1.5 ℃/min after the binder is discharged, and keeping the temperature for 2 h;
and (3) a blank gradual shrinkage stage: continuously heating to 960 ℃ at the heating rate of 1.0 ℃/min;
and (3) a heat preservation stage: keeping the temperature at 960 ℃ for 2 h;
and (3) cooling: after firing, the temperature is reduced, and the cooling rate is 1.5 ℃/min.
And (3) testing:
the ferrite cores and magnetic sheets prepared in the example were tested, and the inductance L of the magnetic ring was tested by an E4991A +16454A radio frequency impedance analyzersAnd Q, calculating the effective magnetic permeability mu i; testing magnetic ring B by IWATSU SY-8218 type hysteresis loop instruments、HcAnd Pcv(ii) a Observing the cross section morphology of the magnetic sheet by adopting a VEGA 3EPH scanning electron microscope; the magnetic sheets were tested for conversion efficiency η, effective permeability μ ', and imaginary effective permeability μ "(where μ ═ μ'/Q, refers to losses) and the results are shown in table 1.
Example 2
An RX terminal nickel-zinc ferrite material for wireless charging is prepared by dividing a formula into a main component and an additive component; the main components are as follows according to the weight of oxides:
the additive is SiO2、Co2O3、MoO3、CaCO3The components of the paint comprise the following components in percentage by weight:
the main components of the raw materials and the additive components are high-purity raw materials with the purity of Fe2O3≥99.5wt％，NiO≥99.5wt％，ZnO≥99wt％，CuO≥99wt％，SiO2≥99wt％，Co2O3≥99wt％，MoO3≥99.5wt％，CaCO3≥99wt％。
An RX terminal nickel-zinc ferrite material for wireless charging and a manufacturing method thereof comprise the following steps:
step 1, weighing raw material Fe according to a formula2O3、NiO、ZnO、CuO、SiO2、Co2O3、MoO3、CaCO3For standby;
step 2, putting the main component raw materials weighed in the step 1 into a sand mill, and mixing the raw materials in parts by weight: ball: the water mass ratio is 1: 4: 1.5, adding zirconia balls with the diameter of 1mm and deionized water into a sand mill tank, setting the rotation speed of the sand mill to be 200rpm, and after ball milling for 10 hours, controlling the particle size of powder to be 1.0 μm when D50 is obtained, thus preparing slurry;
step 3, drying the slurry obtained in the step 2 in an oven, wherein the temperature of the oven is set to be 150 ℃, and the time is 15 hours;
step 4, placing the powder obtained in the step 3 in a high-temperature sintering furnace for presintering, setting the temperature to be 840 ℃, setting the heating rate to be 1.5 ℃/min, preserving the heat for 3 hours and then naturally cooling;
step 5, placing the pre-sintering powder prepared in the step 4 into a ball mill pot, adding an additive according to a formula, operating according to the step 2, carrying out ball milling for 2 hours, and controlling the particle size of the powder to be 1.0 mu m when D50 is obtained, so as to prepare slurry;
step 6, operating the slurry obtained by ball milling in the step 5 according to the step 3, and drying the powder for later use;
and 7, evaluating the performance of the powder prepared in the step 6. Adding 1.5 wt% of a binder with a solid content of 10% into the powder obtained in the step 6, uniformly mixing, granulating, pressing the granulated powder into a ring shape, wherein the thickness is 3.5mm, the inner diameter is 9.0mm, the outer diameter is 14.7mm, the forming pressure is 3.5T, and the pressure maintaining time is 3 s;
and 8, sintering the annular ferrite material pressed in the step 7 in a high-temperature sintering furnace at the sintering temperature of 960 ℃, wherein the sintering comprises the following steps:
a temperature rising stage: slowly heating, slowly heating from room temperature to 450 ℃ at a heating rate of 0.2 ℃/min, keeping the temperature for 4h, continuously heating to 840 ℃ at a heating rate of 1.5 ℃/min after the binder is discharged, and keeping the temperature for 2 h;
and (3) a blank gradual shrinkage stage: continuously heating to 960 ℃ at the heating rate of 1.0 ℃/min;
and (3) a heat preservation stage: keeping the temperature at 960 ℃ for 2 h;
and (3) cooling: after firing, the temperature is reduced, and the cooling rate is 1.5 ℃/min.
The prepared RX end nickel-zinc ferrite material for wireless charging is used for producing an RX end magnetic sheet for wireless charging by a dry casting technology, and comprises the following steps:
step 1, weighing raw material Fe according to a formula2O3、NiO、ZnO、CuO、SiO2、Co2O3、MoO3、CaCO3For standby;
step 2, putting the main component raw materials weighed in the step 1 into a sand mill, and mixing the raw materials in parts by weight: ball: the water mass ratio is 1: 4: 1.5, adding zirconia balls with the diameter of 1mm and deionized water into a sand mill tank, setting the rotation speed of the sand mill to be 200rpm, and after ball milling for 10 hours, controlling the particle size of powder to be 1.0 μm when D50 is obtained, thus preparing slurry;
step 3, drying the slurry obtained in the step 2 in an oven, wherein the temperature of the oven is set to be 150 ℃, and the time is 15 hours;
step 4, placing the powder obtained in the step 3 in a high-temperature sintering furnace for presintering, setting the temperature to be 840 ℃, setting the heating rate to be 1.5 ℃/min, preserving the heat for 3 hours and then naturally cooling;
step 5, placing the pre-sintering powder prepared in the step 4 into a ball mill pot, adding an additive according to a formula, operating according to the step 2, performing ball milling for 2 hours, and controlling the particle size of the powder to be 1.0 mu m when D50 is obtained, so as to prepare slurry;
step 6, operating the slurry obtained by ball milling in the step 5 according to the step 3, and drying the powder for later use;
step 7, manufacturing magnetic sheets by using the powder prepared in the step 6 by using a dry-process tape casting technology, wherein the magnetic sheets can be round, square, rectangular, oval, racetrack-shaped and the like;
step 8, placing the magnetic sheet manufactured in the step 7 in a high-temperature sintering furnace for sintering, wherein the sintering temperature is 960 ℃, and the sintering comprises the following steps:
a temperature rising stage: slowly heating, slowly heating from room temperature to 450 ℃ at a heating rate of 0.5 ℃/min, keeping the temperature for 4h, continuously heating to 840 ℃ at a heating rate of 1.5 ℃/min after the binder is discharged, and keeping the temperature for 2 h;
and (3) a blank gradual shrinkage stage: continuously heating to 960 ℃ at a heating rate of 1.5 ℃/min;
and (3) a heat preservation stage: keeping the temperature at 960 ℃ for 2 h;
and (3) cooling: after firing, the temperature is reduced, and the cooling rate is 1.5 ℃/min.
And (3) testing:
the ferrite cores and magnetic sheets prepared in the example were tested, and the inductance L of the magnetic ring was tested by an E4991A +16454A radio frequency impedance analyzersAnd Q, calculating the effective magnetic permeability mu i; testing magnetic ring B by IWATSU SY-8218 type hysteresis loop instruments、HcAnd Pcv(ii) a Observing the cross section morphology of the magnetic sheet by adopting a VEGA 3EPH scanning electron microscope; the magnetic sheets were tested for conversion efficiency η, effective permeability μ ', and imaginary effective permeability μ "(where μ ═ μ'/Q, refers to losses) and the results are shown in table 1.
Example 3
An RX terminal nickel-zinc ferrite material for wireless charging is prepared by dividing a formula into a main component and an additive component; the main components are as follows according to the weight of oxides:
the additive is SiO2、Co2O3、MoO3、CaCO3The components of the paint comprise the following components in percentage by weight:
the main components of the raw materials and the additive components are high-purity raw materials, and the purity is Fe2O3≥99.5wt％，NiO≥99.5wt％，ZnO≥99wt％，CuO≥99wt％，SiO2≥99wt％，Co2O3≥99wt％，MoO3≥99.5wt％，CaCO3≥99wt％。
An RX terminal nickel-zinc ferrite material for wireless charging and a manufacturing method thereof comprise the following steps:
step 1, weighing raw material Fe according to a formula2O3、NiO、ZnO、CuO、SiO2、Co2O3、MoO3、CaCO3For standby;
step 2, putting the main component raw materials weighed in the step 1 into a sand mill, and mixing the raw materials in parts by weight: ball: the water mass ratio is 1: 4: 1.5, adding zirconia balls with the diameter of 1mm and deionized water into a sand mill tank, setting the rotation speed of the sand mill to be 200rpm, and after ball milling for 10 hours, controlling the particle size of powder to be 1.0 μm when D50 is obtained, thus preparing slurry;
step 3, drying the slurry obtained in the step 2 in an oven, wherein the temperature of the oven is set to be 150 ℃, and the time is 15 hours;
step 4, placing the powder obtained in the step 3 in a high-temperature sintering furnace for presintering, setting the temperature to be 850 ℃, setting the heating rate to be 1.5 ℃/min, preserving the heat for 3 hours and then naturally cooling;
step 5, placing the pre-sintered powder prepared in the step 4 into a ball mill pot, adding an additive according to a formula, operating according to the step 2, performing ball milling for 2.5 hours, and controlling the particle size of the powder to be 1.0 mu m when D50 is set, so as to prepare slurry;
step 6, operating the slurry obtained by ball milling in the step 5 according to the step 3, and drying the powder for later use;
and 7, evaluating the performance of the powder prepared in the step 6. Adding 1.5 wt% of a binder with a solid content of 10% into the powder obtained in the step 6, uniformly mixing, granulating, pressing the granulated powder into a ring shape, wherein the thickness is 3.5mm, the inner diameter is 9.0mm, the outer diameter is 14.7mm, the forming pressure is 3.5T, and the pressure maintaining time is 3 s;
and 8, sintering the annular ferrite material pressed in the step 7 in a high-temperature sintering furnace at the sintering temperature of 960 ℃, wherein the sintering comprises the following steps:
a temperature rising stage: slowly heating, slowly heating from room temperature to 450 ℃ at a heating rate of 0.3 ℃/min, keeping the temperature for 5h, continuously heating to 850 ℃ at a heating rate of 1.5 ℃/min after the binder is discharged, and keeping the temperature for 2 h;
and (3) a blank gradual shrinkage stage: continuously heating to 960 ℃ at the heating rate of 1.0 ℃/min;
and (3) a heat preservation stage: keeping the temperature at 960 ℃ for 2 h;
and (3) cooling: after firing, the temperature is reduced, and the cooling rate is 1.5 ℃/min.
The prepared RX end nickel-zinc ferrite material for wireless charging is used for producing an RX end magnetic sheet for wireless charging by a dry casting technology, and comprises the following steps:
step 1, weighing raw material Fe according to a formula2O3、NiO、ZnO、CuO、SiO2、Co2O3、MoO3、CaCO3For standby;
step 2, putting the main component raw materials weighed in the step 1 into a sand mill, and mixing the raw materials in parts by weight: ball: the water mass ratio is 1: 4: 1.5, adding zirconia balls with the diameter of 1mm and deionized water into a sand mill tank, setting the rotation speed of the sand mill to be 200rpm, and after ball milling for 10 hours, controlling the particle size of powder to be 1.0 μm when D50 is obtained, thus preparing slurry;
step 3, drying the slurry obtained in the step 2 in an oven, wherein the temperature of the oven is set to be 150 ℃, and the time is 15 hours;
step 4, placing the powder obtained in the step 3 in a high-temperature sintering furnace for presintering, setting the temperature to be 850 ℃, setting the heating rate to be 1.5 ℃/min, preserving the heat for 3 hours and then naturally cooling;
step 5, placing the pre-sintered powder prepared in the step 4 into a ball mill pot, adding an additive according to a formula, operating according to the step 2, performing ball milling for 2.5 hours, and controlling the particle size of the powder to be 1.0 mu m when D50 is set, so as to prepare slurry;
step 6, operating the slurry obtained by ball milling in the step 5 according to the step 3, and drying the powder for later use;
step 7, manufacturing magnetic sheets by using the powder prepared in the step 6 by using a dry-process tape casting technology, wherein the magnetic sheets can be round, square, rectangular, oval, racetrack-shaped and the like;
step 8, placing the magnetic sheet manufactured in the step 7 in a high-temperature sintering furnace for sintering, wherein the sintering temperature is 960 ℃, and the sintering comprises the following steps:
a temperature rising stage: slowly heating, slowly heating from room temperature to 450 ℃ at a heating rate of 0.3 ℃/min, keeping the temperature for 5h, continuously heating to 850 ℃ at a heating rate of 1.5 ℃/min after the binder is discharged, and keeping the temperature for 2 h;
and (3) a blank gradual shrinkage stage: continuously heating to 960 ℃ at the heating rate of 1.0 ℃/min;
and (3) a heat preservation stage: keeping the temperature at 960 ℃ for 2 h;
and (3) cooling: after firing, the temperature is reduced, and the cooling rate is 1.5 ℃/min.
And (3) testing:
testing the ferrite magnetic core and the magnetic sheet prepared by the example, testing inductance Ls and Q of the magnetic ring by using an E4991A +16454A radio frequency impedance analyzer, and calculating effective magnetic permeability mu i; testing magnetic rings Bs, Hc and Pcv by using an IWATSU SY-8218 type hysteresis loop instrument; observing the cross section morphology of the magnetic sheet by adopting a VEGA 3EPH scanning electron microscope; the magnetic sheets were tested for conversion efficiency η, effective permeability μ ', and imaginary effective permeability μ "(where μ ═ μ'/Q, refers to losses) and the results are shown in table 1.
Example 4
An RX terminal nickel-zinc ferrite material for wireless charging is prepared by dividing a formula into a main component and an additive component; the main components are as follows according to the weight of oxides:
the additive is SiO2、Co2O3、MoO3、CaCO3The components are mainlyThe total weight percentage of the components is as follows:
the main components of the raw materials and the additive components are high-purity raw materials, and the purity is Fe2O3≥99.5wt％，NiO≥99.5wt％，ZnO≥99wt％，CuO≥99wt％，SiO2≥99wt％，Co2O3≥99wt％，MoO3≥99.5wt％，CaCO3≥99wt％。
An RX terminal nickel-zinc ferrite material for wireless charging and a manufacturing method thereof comprise the following steps:
step 1, weighing raw material Fe according to a formula2O3、NiO、ZnO、CuO、SiO2、Co2O3、MoO3、CaCO3For standby;
step 2, putting the main component raw materials weighed in the step 1 into a sand mill, and mixing the raw materials in parts by weight: ball: the water mass ratio is 1: 4: 1.5, adding zirconia balls with the diameter of 1mm and deionized water into a sand mill tank, setting the rotation speed of the sand mill to be 200rpm, and after ball milling for 10 hours, controlling the particle size of powder to be 1.0 μm when D50 is obtained, thus preparing slurry;
step 3, drying the slurry obtained in the step 2 in an oven, wherein the temperature of the oven is set to be 150 ℃, and the time is 15 hours;
step 4, placing the powder obtained in the step 3 in a high-temperature sintering furnace for presintering, setting the temperature to be 850 ℃, setting the heating rate to be 1.5 ℃/min, preserving the heat for 3 hours and then naturally cooling;
step 5, placing the pre-sintered powder prepared in the step 4 into a ball mill pot, adding an additive according to a formula, operating according to the step 2, performing ball milling for 2.5 hours, and controlling the particle size of the powder to be 1.0 mu m when D50 is set, so as to prepare slurry;
step 6, operating the slurry obtained by ball milling in the step 5 according to the step 3, and drying the powder for later use;
and 7, evaluating the performance of the powder prepared in the step 6. Adding 1.5 wt% of a binder with a solid content of 10% into the powder obtained in the step 6, uniformly mixing, granulating, pressing the granulated powder into a ring shape, wherein the thickness is 3.5mm, the inner diameter is 9.0mm, the outer diameter is 14.7mm, the forming pressure is 3.5T, and the pressure maintaining time is 3 s;
and 8, sintering the annular ferrite material pressed in the step 7 in a high-temperature sintering furnace at the sintering temperature of 960 ℃, wherein the sintering comprises the following steps:
a temperature rising stage: slowly heating, slowly heating from room temperature to 450 ℃ at a heating rate of 0.3 ℃/min, keeping the temperature for 5h, continuously heating to 850 ℃ at a heating rate of 1.5 ℃/min after the binder is discharged, and keeping the temperature for 2 h;
and (3) a blank gradual shrinkage stage: continuously heating to 960 ℃ at the heating rate of 1.0 ℃/min;
and (3) a heat preservation stage: keeping the temperature at 960 ℃ for 2 h;
and (3) cooling: after firing, the temperature is reduced, and the cooling rate is 1.5 ℃/min.
The prepared RX end nickel-zinc ferrite material for wireless charging is used for producing an RX end magnetic sheet for wireless charging by a dry casting technology, and comprises the following steps:
step 1, weighing raw material Fe according to a formula2O3、NiO、ZnO、CuO、SiO2、Co2O3、MoO3、CaCO3For standby;
step 2, putting the main component raw materials weighed in the step 1 into a sand mill, and mixing the raw materials in parts by weight: ball: the water mass ratio is 1: 4: 1.5, adding zirconia balls with the diameter of 1mm and deionized water into a sand mill tank, setting the rotation speed of the sand mill to be 200rpm, and after ball milling for 10 hours, controlling the particle size of powder to be 1.0 μm when D50 is obtained, thus preparing slurry;
step 3, drying the slurry obtained in the step 2 in an oven, wherein the temperature of the oven is set to be 150 ℃, and the time is 15 hours;
step 4, placing the powder obtained in the step 3 in a high-temperature sintering furnace for presintering, setting the temperature to be 850 ℃, setting the heating rate to be 1.5 ℃/min, preserving the heat for 3 hours and then naturally cooling;
step 5, placing the pre-sintered powder prepared in the step 4 into a ball mill pot, adding an additive according to a formula, operating according to the step 2, performing ball milling for 2.5 hours, and controlling the particle size of the powder to be 1.0 mu m when D50 is set, so as to prepare slurry;
step 6, operating the slurry obtained by ball milling in the step 5 according to the step 3, and drying the powder for later use;
step 7, manufacturing magnetic sheets by using the powder prepared in the step 6 by using a dry-process tape casting technology, wherein the magnetic sheets can be round, square, rectangular, oval, racetrack-shaped and the like;
step 8, placing the magnetic sheet manufactured in the step 7 in a high-temperature sintering furnace for sintering, wherein the sintering temperature is 960 ℃, and the sintering comprises the following steps:
a temperature rising stage: slowly heating, slowly heating from room temperature to 450 ℃ at a heating rate of 0.3 ℃/min, keeping the temperature for 5h, continuously heating to 850 ℃ at a heating rate of 1.5 ℃/min after the binder is discharged, and keeping the temperature for 2 h;
and (3) a blank gradual shrinkage stage: continuously heating to 960 ℃ at the heating rate of 1.0 ℃/min;
and (3) a heat preservation stage: keeping the temperature at 960 ℃ for 2 h;
and (3) cooling: after firing, the temperature is reduced, and the cooling rate is 1.5 ℃/min.
And (3) testing:
the ferrite cores and magnetic sheets prepared in the example were tested, and the inductance L of the magnetic ring was tested by an E4991A +16454A radio frequency impedance analyzersAnd Q, calculating the effective magnetic permeability mu i; testing magnetic ring B by IWATSU SY-8218 type hysteresis loop instruments、HcAnd Pcv(ii) a Observing the cross section morphology of the magnetic sheet by adopting a VEGA 3EPH scanning electron microscope; the magnetic sheets were tested for conversion efficiency η, effective permeability μ ', and imaginary effective permeability μ "(where μ ═ μ'/Q, refers to losses) and the results are shown in table 1.
Example 5
An RX terminal nickel-zinc ferrite material for wireless charging is prepared by dividing a formula into a main component and an additive component; the main components are as follows according to the weight of oxides:
the additive is SiO2、Co2O3、MoO3、CaCO3The components of the paint comprise the following components in percentage by weight:
the main components of the raw materials and the additive components are high-purity raw materials, and the purity is Fe2O3≥99.5wt％，NiO≥99.5wt％，ZnO≥99wt％，CuO≥99wt％，SiO2≥99wt％，Co2O3≥99wt％，MoO3≥99.5wt％，CaCO3≥99wt％。
An RX terminal nickel-zinc ferrite material for wireless charging and a manufacturing method thereof comprise the following steps:
step 1, weighing raw material Fe according to a formula2O3、NiO、ZnO、CuO、SiO2、Co2O3、MoO3、CaCO3For standby;
step 2, putting the main component raw materials weighed in the step 1 into a sand mill, and mixing the raw materials in parts by weight: ball: the water mass ratio is 1: 4: 1.5, adding zirconia balls with the diameter of 1mm and deionized water into a sand mill tank, setting the rotation speed of the sand mill to be 200rpm, and after ball milling for 10 hours, controlling the particle size of powder to be 1.0 μm when D50 is obtained, thus preparing slurry;
step 3, drying the slurry obtained in the step 2 in an oven, wherein the temperature of the oven is set to be 150 ℃, and the time is 15 hours;
step 4, placing the powder obtained in the step 3 in a high-temperature sintering furnace for presintering, setting the temperature to be 850 ℃, setting the heating rate to be 1.5 ℃/min, preserving the heat for 3 hours and then naturally cooling;
step 5, placing the pre-sintered powder prepared in the step 4 into a ball mill pot, adding an additive according to a formula, operating according to the step 2, performing ball milling for 2.5 hours, and controlling the particle size of the powder to be 1.0 mu m when D50 is set, so as to prepare slurry;
step 6, operating the slurry obtained by ball milling in the step 5 according to the step 3, and drying the powder for later use;
and 7, evaluating the performance of the powder prepared in the step 6. Adding 1.5 wt% of a binder with a solid content of 10% into the powder obtained in the step 6, uniformly mixing, granulating, pressing the granulated powder into a ring shape, wherein the thickness is 3.5mm, the inner diameter is 9.0mm, the outer diameter is 14.7mm, the forming pressure is 3.5T, and the pressure maintaining time is 3 s;
and 8, sintering the annular ferrite material pressed in the step 7 in a high-temperature sintering furnace at the sintering temperature of 960 ℃, wherein the sintering comprises the following steps:
a temperature rising stage: slowly heating, slowly heating from room temperature to 450 ℃ at a heating rate of 0.3 ℃/min, keeping the temperature for 5h, continuously heating to 850 ℃ at a heating rate of 1.5 ℃/min after the binder is discharged, and keeping the temperature for 2 h;
and (3) a blank gradual shrinkage stage: continuously heating to 960 ℃ at the heating rate of 1.0 ℃/min;
and (3) a heat preservation stage: keeping the temperature at 960 ℃ for 2 h;
and (3) cooling: after firing, the temperature is reduced, and the cooling rate is 1.5 ℃/min.
The prepared RX end nickel-zinc ferrite material for wireless charging is used for producing an RX end magnetic sheet for wireless charging by a dry casting technology, and comprises the following steps:
step 1, weighing raw material Fe according to a formula2O3、NiO、ZnO、CuO、SiO2、Co2O3、MoO3For standby;
step 2, putting the main component raw materials weighed in the step 1 into a sand mill, and mixing the raw materials in parts by weight: ball: the water mass ratio is 1: 4: 1.5, adding zirconia balls with the diameter of 1mm and deionized water into a sand mill tank, setting the rotation speed of the sand mill to be 200rpm, and after ball milling for 10 hours, controlling the particle size of powder to be 1.0 μm when D50 is obtained, thus preparing slurry;
step 3, drying the slurry obtained in the step 2 in an oven, wherein the temperature of the oven is set to be 150 ℃, and the time is 15 hours;
step 4, placing the powder obtained in the step 3 in a high-temperature sintering furnace for presintering, setting the temperature to be 850 ℃, setting the heating rate to be 1.5 ℃/min, preserving the heat for 3 hours and then naturally cooling;
step 5, placing the pre-sintered powder prepared in the step 4 into a ball mill pot, adding an additive according to a formula, operating according to the step 2, performing ball milling for 2.5 hours, and controlling the particle size of the powder to be 1.0 mu m when D50 is set, so as to prepare slurry;
step 6, operating the slurry obtained by ball milling in the step 5 according to the step 3, and drying the powder for later use;
step 7, manufacturing magnetic sheets by using the powder prepared in the step 6 by using a dry-process tape casting technology, wherein the magnetic sheets can be round, square, rectangular, oval, racetrack-shaped and the like;
step 8, placing the magnetic sheet manufactured in the step 7 in a high-temperature sintering furnace for sintering, wherein the sintering temperature is 960 ℃, and the sintering comprises the following steps:
a temperature rising stage: slowly heating, slowly heating from room temperature to 450 ℃ at a heating rate of 0.3 ℃/min, keeping the temperature for 5h, continuously heating to 850 ℃ at a heating rate of 1.5 ℃/min after the binder is discharged, and keeping the temperature for 2 h;
and (3) a blank gradual shrinkage stage: continuously heating to 960 ℃ at the heating rate of 1.0 ℃/min;
and (3) a heat preservation stage: keeping the temperature at 960 ℃ for 2 h;
and (3) cooling: after firing, the temperature is reduced, and the cooling rate is 1.5 ℃/min.
And (3) testing:
the ferrite cores and magnetic sheets prepared in the example were tested, and the inductance L of the magnetic ring was tested by an E4991A +16454A radio frequency impedance analyzersAnd Q, calculating the effective magnetic permeability mu i; testing magnetic ring B by IWATSU SY-8218 type hysteresis loop instruments、HcAnd Pcv(ii) a Observing the cross section morphology of the magnetic sheet by adopting a VEGA 3EPH scanning electron microscope; the magnetic sheets were tested for conversion efficiency η, effective permeability μ ', and imaginary effective permeability μ "(where μ ═ μ'/Q, refers to losses) and the results are shown in table 1.
The RX terminal nickel zinc ferrite material for wireless charging and the magnetic sheet for wireless charging produced in the above five examples were subjected to performance tests, comparing with the related performance of the conventional material, as shown in table 1, fig. 3 and fig. 4.
Table 1 comparative table of test results
From table 1, the RX end ferrite material and magnetic sheet for wireless charging prepared according to the examples of the present invention have the advantages of high magnetic permeability, high Bs, low power consumption, high sintering efficiency, and the like, compared to the conventional material; wherein the saturation magnetic flux density Bs of the ferrite material in each example can reach 370mT, while the saturation magnetic flux density Bs of the traditional ferrite powder is within 270 mT; the ferrite material in each example had a power consumption within 200mW/cm3, while the conventional ferrite powder had a power consumption of 500mW/cm3The above; the Curie temperature Tc of the ferrite material in each example is higher than that of the traditional material by more than 30 ℃, the magnetic permeability reduction rate is lower, and the ferrite material can stably work at higher temperature. The magnetic sheet in each example was sintered at a low temperature of 960 c, the magnetic permeability of the magnetic sheet was stabilized at ± 10%, and the magnetic sheet produced from the conventional material could be sintered only in a single sheet, otherwise the magnetic sheet deformed. In summary, the RX end ferrite material and the magnetic sheet for wireless charging manufactured by the embodiments of the present invention have superior performance to the conventional materials.
In which FIG. 3 shows the microstructure of a magnetic sheet in each example of the present invention, and FIG. 4 shows the microstructure of a magnetic sheet of a conventional material; as can be seen from a comparison of FIGS. 3 and 4, the magnetic sheet obtained in each example of the present invention had very few voids after sintering, and had densification, fine and uniform crystal grains; the traditional material has more gaps and relatively larger crystal grains and is flaky; therefore, the material prepared in each embodiment of the invention is more beneficial to magnetic sheet cracking and has less influence on the electromagnetic performance.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several equivalent substitutions or obvious modifications can be made without departing from the spirit of the invention, and all the properties or uses are considered to be within the scope of the invention.
Claims (10)
1. The RX end ferrite material for wireless charging is characterized in that the formula of the RX end ferrite material consists of a main component and an additive component, wherein the main component is Fe2O3NiO, ZnO and CuO, wherein the total weight of the components is 100 wt%:
Fe2O3 66.0wt%～66.5wt%
NiO 5.5wt%～6.1wt%
ZnO 21.3wt%～22.0wt%
CuO 6.0wt%～6.5wt%；
the additive component is made of SiO2、Co2O3、MoO3、CaCO3The composition comprises the following components in percentage by weight of the total weight of the main component:
SiO2 0.02wt%～0.10wt%
Co2O3 0.02wt%～0.10wt%
MoO3 0.02wt%～0.10wt%
CaCO30.01wt%～0.10wt%。
2. the RX end ferrite material for wireless charging according to claim 1, wherein each of said main component and said additive component is a high-purity raw material having a purity of: fe2O3≥99.5wt％，NiO ≥99.5wt％，ZnO ≥ 99wt％，CuO ≥ 99wt％，SiO2≥99wt％，Co2O3 ≥ 99wt％，MoO3≥ 99.5wt％，CaCO3≥ 99wt％。
3. A manufacturing method of an RX end ferrite material for wireless charging is characterized by comprising the following steps:
s1: the RX terminal ferrite for wireless charging according to claim 1 or 2Raw materials of Fe2O3, NiO, ZnO, CuO and SiO2、Co2O3、MoO3、CaCO3；
S2: putting the raw materials of the main components weighed in the step S1 into a sand mill, and performing ball milling to prepare slurry;
s3: drying the slurry obtained in the step S2 to obtain powder;
s4: pre-burning the powder obtained in the step S3 to prepare pre-burned powder;
s5: putting the pre-sintered powder obtained in the step S4 into a ball mill, and then putting the raw materials of the additive components weighed in the step S1 into the ball mill for ball milling to prepare slurry;
s6: and (4) drying the slurry obtained in the step (S5) to obtain the RX end ferrite material for wireless charging.
4. The manufacturing method according to claim 3,
the ball milling step in step S2 specifically includes: according to the reference: ball: the water mass ratio is 1: 4: 1.5, adding zirconia balls with the diameter of 1-5 mm and deionized water into a sand mill tank, setting the rotating speed of the sand mill to be 200-250 rpm, and controlling the particle size of powder to be D50=1.0 mu m +/-0.2 mu m after ball milling for 4-10 h to prepare slurry;
the ball milling step in step S5 specifically includes: according to the reference: ball: the water mass ratio is 1: 4: 1.5, adding zirconia balls with the diameter of 1-5 mm and deionized water into a ball mill tank, setting the rotating speed of the ball mill to be 200-250 rpm, and controlling the particle size of powder to be D50=1.0 μm +/-0.2 μm after ball milling time is 1-4 h to prepare slurry.
5. The manufacturing method according to claim 3,
the drying step in step S3 specifically includes: drying the slurry obtained in the step S2 in an oven, wherein the temperature of the oven is set to be 100-200 ℃, and the time is 10-24 h;
the drying step in step S6 specifically includes: and (5) drying the slurry obtained in the step (S5) in an oven, wherein the temperature of the oven is set to be 100-200 ℃, and the time is 10-24 h.
6. The manufacturing method according to claim 3,
the pre-burning step in step S4 specifically includes: and (5) placing the powder obtained in the step (S3) in a high-temperature sintering furnace for presintering, setting the temperature to be 800-850 ℃, setting the heating rate to be 1-4 ℃/min, preserving the heat for 2-4 h, and then naturally cooling.
7. An RX end ferrite material for wireless charging, characterized by being produced by the production method according to any one of claims 3 to 6.
8. A manufacturing method of an RX end magnetic sheet for wireless charging is characterized by comprising the following steps:
comprising the steps S1-S6 in the method for manufacturing the RX terminal ferrite material for wireless charging as set forth in any one of claims 3 to 6, an
S7: preparing the magnetic sheet from the RX end ferrite material for wireless charging obtained in the step S6 by adopting dry casting;
s8: and (4) sintering the magnetic sheet obtained in the step (S7) to obtain the RX end magnetic sheet for wireless charging.
9. The manufacturing method according to claim 8, wherein the sintering step in step S8 specifically includes:
a temperature rising stage: raising the temperature from room temperature to 400-500 ℃ at a heating rate of 0.1-1.0 ℃/min, and preserving the heat for 2-5 h, after the binder is discharged, continuing to raise the temperature to 800-900 ℃ at a heating rate of 1.0-2.0 ℃/min, and preserving the heat for 1-3 h;
and (3) a blank gradual shrinkage stage: continuously heating to 920-1000 ℃ at the heating rate of 0.5-1.5 ℃/min;
and (3) a heat preservation stage: preserving the heat for 1 to 4 hours at the temperature of 920 to 1000 ℃;
and (3) cooling: after the sintering, the temperature is reduced, and the cooling rate is 0.5 ℃/min to 2.0 ℃/min.
10. An RX end magnetic sheet for wireless charging, characterized by being produced by the production method according to claim 8 or 9.
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| KR101358440B1 (en) * | 2012-08-06 | 2014-02-05 | (주)엠피티 | Method of injection molding article for absorbing an electronic wave |
| CN103613370A (en) * | 2013-05-27 | 2014-03-05 | 安徽泰德电子科技有限公司 | Preparation method for high-temperature and high-BS manganese zinc ferrite material with low power consumption |
| KR20140065364A (en) * | 2012-11-21 | 2014-05-29 | 동부씨엔아이 주식회사 | A hybrid magnetic sheet for wireless power charging and near field communication and a hybrid module comprising the same |
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| CN106699159A (en) * | 2016-12-15 | 2017-05-24 | 东莞华晶粉末冶金有限公司 | Ferrite powder and preparation method and application thereof |
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| KR101358440B1 (en) * | 2012-08-06 | 2014-02-05 | (주)엠피티 | Method of injection molding article for absorbing an electronic wave |
| KR20140065364A (en) * | 2012-11-21 | 2014-05-29 | 동부씨엔아이 주식회사 | A hybrid magnetic sheet for wireless power charging and near field communication and a hybrid module comprising the same |
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| CN104446421A (en) * | 2014-12-19 | 2015-03-25 | 宝鸡烽火诺信科技有限公司 | High-magnetic conductivity nickel and zinc soft magnetic ferrite material and preparation method |
| CN106699159A (en) * | 2016-12-15 | 2017-05-24 | 东莞华晶粉末冶金有限公司 | Ferrite powder and preparation method and application thereof |
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