Nickel-zinc soft ferrite for wireless charging and preparation method and application thereof

Abstract

The invention belongs to the field of soft ferrite, and discloses nickel-zinc soft ferrite for wireless charging and a preparation method and application thereof. The ferrite comprises a main component and a doping component, wherein the main component comprises Fe2O3, NiO, ZnO and CuO; the doping component at least comprises one of Nd2O3, Pr6O11, Gd2O3, Dy2O3, Tb2O3, Ho2O3 and Sm2O3; in terms ofthe weight of the main component, the Fe2O3 content of the main component is 64-67wt%, the NiO content thereof is 4-10wt%, the ZnO content thereof is 18-24wt% and the CuO content thereof is 3-9wt%; interms of the weight of the main component, the content of each doping component is 0.02-0.2wt%, and the total addition amount is smaller than or equal to 0.5wt%. Through improvement on the doping component of the nickel-zinc soft ferrite, a thin ferrite magnetic sheet product is sintered densely when T is equal to 0.05-0.2mm, the sintering temperature width is increased, the shrinkage rate is slow during sintering temperature rise, and the appearance is smooth; meanwhile, the power loss per unit volume of the magnetic sheet (power consumption) can be also effectively reduced, the working temperature rise of a wireless charging component can be reduced, and the transmission efficiency can be improved.

Description

Technical field

[0001] The invention belongs to the technical field of soft ferrite materials, and relates to a nickel-zinc soft ferrite, in particular to a nickel-zinc soft ferrite for wireless charging, and a preparation method and application thereof. Background technique

[0002] For 3C products such as mobile phones and tablet computers, there are two common charging methods for their batteries, contact charging and non-contact charging. The contact charging method is a method in which the electrodes of the power receiving device directly contact the electrodes of the power supply device for charging.

[0003] As far as the contact charging method is concerned, due to its simple device structure, it is usually used in a wide range of applications. However, with the development trend of larger and larger mobile phone screens, higher performance and more diversified functions, The consumption of battery energy has also increased exponentially. However, the energy density of lit...

Examples

preparation example Construction

[0039] The method for preparing a nickel-zinc soft ferrite for wireless charging of the present invention specifically includes the following steps:

[0040] (1) Weigh the raw materials in the above-mentioned main components and doped components, and mix them evenly by ball milling / sanding. The grinding medium used is iron balls or zirconia balls. After ball milling, the raw materials are mixed. Laser particle size D50≤1μm, after ball milling The powder is dried, sieved, and calcined. The calcining temperature is 850~900℃, the calcining time is 2~5h, and the air atmosphere is calcined; after calcining, the powder is subjected to secondary ball milling / sand milling, and the grinding medium used is also iron Ball or zirconia ball, the mixed raw material after the second ball milling, the laser particle size D50≤2μm, the powder after the second ball milling / sanding is dried and sieved to obtain the required ferrite powder;

[0041] (2) Based on the weight of ferrite powder, add 30-60w...

Embodiment 1

[0045] In the ferrite thin magnetic sheet for wireless charging of electronic products of the first embodiment, the nickel-zinc soft ferrite used in it is made of the following raw materials: main component: Fe 2 O 3 65.3kg, NiO is 5.6kg, ZnO is 22.5kg and CuO is 6.6kg, doped composition: Dy 2 O 3 It is 0.1kg; its preparation method includes the following steps:

[0046] (1) Weigh the above-mentioned metal oxide raw materials according to the above-mentioned ratio, mix and wet ball mill at a speed of 400r / min for 4 hours at a time, dry, and then pre-fire in an air atmosphere at a pre-fire temperature of 910℃ / 4h; The powder is once again subjected to wet ball milling, ball milled at a speed of 600r / min for 6 hours, and dried to obtain ferrite powder;

[0047] (3) To prepare the casting slurry, the solvent used is a mixture of methyl ethyl ketone and toluene system with a mass ratio of 1:1, and the added amount is 44wt% based on the weight of the ferrite powder; the binder is polyviny...

Embodiment 2

[0051] In the second embodiment of the ferrite thin magnetic sheet for wireless charging of electronic products, the nickel-zinc soft ferrite used in it is made of the following raw materials: main component: Fe 2 O 3 65.3kg, NiO is 5.6kg, ZnO is 22.5kg and CuO is 6.6kg, doped composition: Dy 2 O 3 0.05kg, Y 2 O 3 0.05kg and Tb 2 O 3 Is 0.05kg;

[0052] The preparation process is the same as in Example 1.

Technical field

[0001] The invention belongs to the technical field of soft ferrite materials, and relates to a nickel-zinc soft ferrite, in particular to a nickel-zinc soft ferrite for wireless charging, and a preparation method and application thereof. Background technique

[0002] For 3C products such as mobile phones and tablet computers, there are two common charging methods for their batteries, contact charging and non-contact charging. The contact charging method is a method in which the electrodes of the power receiving device directly contact the electrodes of the power supply device for charging.

[0003] As far as the contact charging method is concerned, due to its simple device structure, it is usually used in a wide range of applications. However, with the development trend of larger and larger mobile phone screens, higher performance and more diversified functions, The consumption of battery energy has also increased exponentially. However, the energy density of lit...

Examples

preparation example Construction

[0039] The method for preparing a nickel-zinc soft ferrite for wireless charging of the present invention specifically includes the following steps:

[0040] (1) Weigh the raw materials in the above-mentioned main components and doped components, and mix them evenly by ball milling / sanding. The grinding medium used is iron balls or zirconia balls. After ball milling, the raw materials are mixed. Laser particle size D50≤1μm, after ball milling The powder is dried, sieved, and calcined. The calcining temperature is 850~900℃, the calcining time is 2~5h, and the air atmosphere is calcined; after calcining, the powder is subjected to secondary ball milling / sand milling, and the grinding medium used is also iron Ball or zirconia ball, the mixed raw material after the second ball milling, the laser particle size D50≤2μm, the powder after the second ball milling / sanding is dried and sieved to obtain the required ferrite powder;

[0041] (2) Based on the weight of ferrite powder, add 30-60w...

Embodiment 1

[0045] In the ferrite thin magnetic sheet for wireless charging of electronic products of the first embodiment, the nickel-zinc soft ferrite used in it is made of the following raw materials: main component: Fe 2 O 3 65.3kg, NiO is 5.6kg, ZnO is 22.5kg and CuO is 6.6kg, doped composition: Dy 2 O 3 It is 0.1kg; its preparation method includes the following steps:

[0046] (1) Weigh the above-mentioned metal oxide raw materials according to the above-mentioned ratio, mix and wet ball mill at a speed of 400r / min for 4 hours at a time, dry, and then pre-fire in an air atmosphere at a pre-fire temperature of 910℃ / 4h; The powder is once again subjected to wet ball milling, ball milled at a speed of 600r / min for 6 hours, and dried to obtain ferrite powder;

[0047] (3) To prepare the casting slurry, the solvent used is a mixture of methyl ethyl ketone and toluene system with a mass ratio of 1:1, and the added amount is 44wt% based on the weight of the ferrite powder; the binder is polyviny...

Embodiment 2

[0051] In the second embodiment of the ferrite thin magnetic sheet for wireless charging of electronic products, the nickel-zinc soft ferrite used in it is made of the following raw materials: main component: Fe 2 O 3 65.3kg, NiO is 5.6kg, ZnO is 22.5kg and CuO is 6.6kg, doped composition: Dy 2 O 3 0.05kg, Y 2 O 3 0.05kg and Tb 2 O 3 Is 0.05kg;

[0052] The preparation process is the same as in Example 1.

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