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A kind of NFC mobile phone payment ferrite magnetic shielding material and preparation method thereof

A ferrite material and ferrite magnetic technology, applied in shielding materials, magnetic field/electric field shielding, electrical components, etc., can solve problems such as difficult to find a compromise effect, achieve cheap production raw materials, increase operating distance, and simple process Effect

Active Publication Date: 2018-10-16
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, at a high frequency of 13.56MHz, the goal requirements of increasing the magnetic permeability of ferrite and improving its quality factor are basically contradictory, and improving one index is largely at the expense of the other. , it is difficult to find a better compromise

Method used

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  • A kind of NFC mobile phone payment ferrite magnetic shielding material and preparation method thereof
  • A kind of NFC mobile phone payment ferrite magnetic shielding material and preparation method thereof

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Embodiment Construction

[0025] The present invention will be further described below in conjunction with the embodiments and the accompanying drawings.

[0026] A high magnetic permeability NFC ferrite magnetic shielding material is characterized in that the main phase of the ferrite material is a spinel structure, and its molecular structure expression is Ni 0.34 Zn 0.48 Cu 0.18 Fe 1.98 o 4 . On the basis of the above NiCuZn ferrite formula, Bi 2 o 3 、Co 2 o 3 and CaCO 3 The three materials work together as dopants, where Bi 2 o 3 : 0.5wt%, Co2 o 3 : 0.4wt%, CaCO 3 : 0.05wt%.

[0027] Its preparation method comprises the following steps:

[0028] Step 1: NiO, ZnO, CuO, Fe 2 o 3 As the initial raw material, in molar ratio NiO:ZnO:CuO:Fe 2 o 3 =0.34:0.48:0.18:0.99 to convert NiO, ZnO, CuO and Fe 2 o 3 % by mass, carry out weighing, mixing, drying after a ball mill;

[0029] Step 2: After sieving the primary ball mill drying material obtained in Step 1, compact and drill holes in t...

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Abstract

The invention belongs to the technical field of electronic ceramic materials, and in particular relates to an NFC mobile phone payment ferrite magnetic shielding material with high magnetic permeability and high quality factor and a preparation method thereof. The main crystal phase of the ferrite magnetic shielding material is spinel structure, and the molecular structure expression is Ni0.34‑xZn0.48+xCu0.18Fe1.98O4, where 0<x≤0.01; the main formula is composed of analytically pure Raw materials NiO, ZnO, CuO, Fe2O3 are composed of molar ratio (0.34‑x): (0.48+x): 0.18: 0.99; dopant is Bi2O3: 0.5wt%, Co2O3: 0.4wt% and CaCO3: 0.04wt%~ 0.06 wt%. The ferrite magnetic shielding material has an initial magnetic permeability of 195-205 and a quality factor of 50-60 at an operating frequency of 13.56 MHz. The pre-firing temperature is higher than the final sintering temperature, and the shrinkage rate is greatly reduced, which better ensures that warping and cracking are not easy to occur when processing NFC magnetic sheets. The production raw materials are cheap, the process is simple, the operation is convenient and the cost is low.

Description

technical field [0001] The invention belongs to the technical field of electronic ceramic materials, and in particular relates to an NFC mobile phone payment ferrite magnetic shielding material with high magnetic permeability and high quality factor and a preparation method thereof. Background technique [0002] In recent years, with the continuous development of the communication industry, the 4G network and wireless applications have gradually deepened. At the same time, the near field communication technology (NFC) is also developing rapidly. NFC is a short-range wireless communication technology with a working frequency of 13.56MHz and a communication distance of 0-20cm. NFC evolved from the integration of non-contact radio frequency identification (RFID) and interconnection technology. When the NFC chip is installed on the mobile phone, the mobile phone can realize small electronic payment and read information of other NFC devices or tags. The short-distance interactio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05K9/00C04B35/26C04B35/622C04B35/64
CPCC04B35/2633C04B35/622C04B35/64C04B2235/3208C04B2235/3275C04B2235/3279C04B2235/3281C04B2235/3284C04B2235/3298C04B2235/656C04B2235/661C04B2235/763H05K9/0075
Inventor 苏桦杨红星周振华唐晓莉张怀武荆玉兰刘保元
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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