A kind of WPC and NFC dual-purpose high-frequency high-permeability low-loss nickel-zinc ferrite and its preparation method
A nickel-zinc ferrite, high-permeability technology, used in inductor/transformer/magnet manufacturing, inorganic material magnetism, electrical components, etc., can solve problems such as difficulty in finding a compromise effect
Active Publication Date: 2021-11-02
TDG HLDG CO LTD
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Problems solved by technology
However, at high frequencies, the goal requirements of increasing the magnetic permeability of ferrite and reducing loss are basically contradictory, and it is difficult to find a better compromise effect
Method used
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Embodiment Construction
[0040] The present invention will be described below based on specific examples, but the present invention is not limited to these examples.
[0041] Nickel-zinc ferrite of the present invention adopts traditional oxide method to manufacture, and concrete steps are as follows successively:
[0042] Step 1: NiO, ZnO, CuO, Co 3 o 4 , Fe 2 o 3 As raw material, according to Table 1 (embodiment and comparative example) molar ratio 0.31:0.51:0.09:0.03:0.995, after carrying out batching, be placed in mixing equipment and carry out mixing and drying, mixing time is 50min;
[0043] Step 2: pre-fire the mixed materials in a bell kiln, the pre-fire temperature is controlled at 960°C, keep warm for 2 hours and then cool with the furnace;
[0044] Step 3: After adding auxiliary components to the calcined material obtained in Step 2, perform high-energy planetary ball milling. The ball milling time is 90 minutes. After pulverization, the median particle size of the slurry is controlled ...
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Abstract
The invention discloses a high-frequency, high-permeability, low-loss nickel-zinc ferrite for both WPC and NFC and a preparation method thereof. The nickel-zinc ferrite is composed of a main component and an auxiliary component, and the molecular structure expression of the main component is: : Ni 0.27+a+b Zn 0.52‑a Cu 0.09 co 0.12‑b Fe 1.99 o 4 , where 0<a≤0.08, 0<b≤0.03; the secondary component is: CaCO 3 0.09~0.12wt%, MoO 3 0.08~0.14wt%, Nb 2 o 5 0.05~0.08wt%, BaCO 3 0.02~0.06wt%, SrCO 3 0.01~0.02wt%. The real part of the complex permeability of the ferrite is 200 (1±10%) at the working frequency of 6.78MHz, and the imaginary part of the complex permeability is ≤3; at 13.56MHz, the real part of the complex permeability is 230 (1±10%) ), the imaginary part of complex permeability ≤ 6, and the saturation flux density ≥ 420mT, which can meet the performance requirements of high frequency, high permeability, low loss and high saturation flux density of ferrite shielding materials for wireless charging and near field communication at the same time .
Description
technical field [0001] The invention belongs to the technical field of soft magnetic ferrites, and in particular relates to a nickel-zinc ferrite with high frequency, high magnetic permeability and low loss for both WPC (wireless charging) and NFC (near field communication). Background technique [0002] With the rapid development of smart electronic products, the current development trend of wireless charging technology is quite rapid. According to the different design principles and mechanisms, the realization of wireless charging can be divided into three categories according to different application frequency bands, low frequency is electromagnetic induction coupling, medium and high frequency is electromagnetic resonance, and higher frequency is electromagnetic radiation. At present, the non-contact wireless charging devices used in the market are mainly electromagnetic induction and electromagnetic resonance wireless chargers, and they have been commercialized. Compar...
Claims
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IPC IPC(8): C04B35/26C04B35/622H01F1/36H01F41/02
Inventor 陈诚海殷志杰李小龙邢冰冰缪思敏宋岩岩
Owner TDG HLDG CO LTD