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Nickel-zinc ferrite material for wireless signal sensing, sheet core and preparation method thereof

A nickel-zinc ferrite, wireless signal technology, applied in the direction of inorganic material magnetism, magnetic core/yoke, transformer/inductor components, etc., can solve problems such as poor communication, antenna resonance frequency change, communication interruption, etc. Achieve the effect of improving high frequency characteristics, good high frequency and low loss characteristics, and increasing resistivity

Active Publication Date: 2012-12-05
TDG HLDG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the working frequency of the wireless signal sensing antenna module is generally 13.56MHz. When the module is installed in electronic equipment and works near metal, the resonant frequency of the antenna will change, resulting in poor communication or even communication interruption.

Method used

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  • Nickel-zinc ferrite material for wireless signal sensing, sheet core and preparation method thereof
  • Nickel-zinc ferrite material for wireless signal sensing, sheet core and preparation method thereof
  • Nickel-zinc ferrite material for wireless signal sensing, sheet core and preparation method thereof

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Embodiment Construction

[0045] The present invention will be described below based on specific examples, but the present invention is not limited to these examples.

[0046] The nickel-zinc ferrite material for wireless signal sensing of the present invention is manufactured by a traditional oxide method, and the specific steps are as follows:

[0047] (1) Mixing: According to the ratio of the main components in Table 1, dry mixing is carried out, and the mixing time is 30-60 minutes;

[0048] (2) Pre-burning: pre-fire the mixed materials in a pusher kiln, the pre-fire temperature is controlled at 930±20°C, and the pre-fire time is 140~240 minutes;

[0049] (3) Pulverization: add auxiliary components to the main component calcined material obtained in the previous step of calcining, and then carry out wet pulverization. The pulverization time is 90~120 minutes, and the particle size of the slurry after pulverization is controlled at 1.1~2.5μm;

[0050] (4) Granulation: Add PVA equivalent to 1.5-2.0%...

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PUM

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Abstract

The invention relates to a nickel-zinc ferrite material for wireless signal sensing, a sheet core and a preparation method thereof. The nickel-zinc ferrite material comprises main components which are calculated by the following oxides in mole percent: 48.0-62.5mol% of Fe2O3, 15.3-25.5mol% of NiO, 18.5-23.5mol% of ZnO and 3-10mol% of CuO; and the nickel-zinc ferrite material additionally comprises auxiliary components which are calculated by the following standard substances in weight percent relative to the total weight of the main components: 0.05-0.10wt% of nano CaCO3, 0.30-0.85wt% of nano SiO2, 1.50-2.50wt% of Mn3O4, 0.05-0.35wt% of Co2O3 and 1.00-1.50wt% of Bi2O3. The nickel-zinc ferrite material is prepared by adopting an oxidation method. The sheet core is a reticular sheet, the length is 45-250mm, the width is 45-250mm, the thickness is 0.05-0.3mm, the sheet core is formed by small sheets in a connecting way, the gaps among the small sheets are less than 50mum, and the sheet core is directly molded and then is sintered, or a magnetic bar is molded and then is sliced into small sheets which form the sheet core through an SMT (surface mount device) technology. At frequency of 13.56MHz, the material has the electromagnetic performance that mu' is equal to 125 plus or minus 20% and the mu'' is less than or equal to 4. Therefore, the material can satisfy the requirement of high-frequency low consumption on the ferrite material for wireless signal sensing.

Description

technical field [0001] The invention belongs to the technical field of soft magnetic ferrite, and in particular relates to a nickel-zinc ferrite material for wireless signal sensing and a sheet magnetic core thereof, and also relates to a preparation method of the nickel-zinc ferrite material and a sheet magnetic core thereof. Background technique [0002] Nickel-zinc ferrite has the characteristics of high resistivity and high frequency of use, making it widely used in fields such as anti-electromagnetic interference, SMD (surface mount devices), MLCI (multiplayer chop inductors), electronic transformers, and high-power synthesizers. ,Market prospects. [0003] With the development of devices towards higher frequencies, higher requirements are put forward for the performance of nickel-zinc soft ferrite. When power inductors are used at high frequencies, especially at 10MHz to 20MHz, the performance of the device is often deteriorated due to the high μ" value, large loss, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/26C04B35/622H01F1/36H01F3/02H01F27/245
Inventor 孙蒋平聂敏马占华黄宏辉徐方舟
Owner TDG HLDG CO LTD
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