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Preparation method of flexible sintered ferrite films

A technology of sintering iron and ferrite powder, which is applied in the field of magnetic materials of radio frequency identification system (RFID), and can solve the problems of surrounding alternating magnetic field and eddy current loss, etc.

Inactive Publication Date: 2015-08-19
SHENZHEN MICROGATE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This brings a corresponding problem: when the antenna transmits a signal, it will generate an alternating magnetic field around it
The closed metal sheet (or conductor block) is in an alternating magnetic field, and the alternating magnetic flux causes an induced current in the closed metal sheet (or conductor block), forming an eddy current, resulting in eddy current loss

Method used

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  • Preparation method of flexible sintered ferrite films
  • Preparation method of flexible sintered ferrite films

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Embodiment Construction

[0030] This embodiment is a preferred implementation mode of the present invention, and other principles and basic structures that are the same or similar to this embodiment are within the protection scope of the present invention.

[0031] The present invention mainly relates to a preparation method of a flexible sintered ferrite diaphragm, which comprises the following specific steps:

[0032] 1) Preparation of slurry: Add ferrite powder and solvent to the ball mill tank according to the preset ratio for ball milling. In this embodiment, the ferrite powder is selected with an average particle size of 1 μm and a magnetic permeability between 70 and 200. , and it is prepared from ferrite powder with low magnetic loss (typical value between 1~6). The preferred ferrite powder is ferrite with magnetic permeability of 150~160 and magnetic loss of 2~4 powder; in this example, a mixture of ethanol (EtOH) and butanone (MEK) is used as a solvent, wherein the mass ratio of ethanol and ...

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Abstract

The invention discloses a preparation method of flexible sintered ferrite films, including: 1) preparing slurry, to be specific, adding ferrite powder and solvent into a ball-mill tank according to a preset ratio, performing ball milling; 2) filtering the slurry, to be specific, pouring prepared slurry from the ball-mill tank; 3) performing flow-casting, to be specific, casting a flat and even tape on a steel strip or a PET (polyethylene terephthalate) film by steel strip flow casting or PET film flow casting, and drying the tape in a drying oven; 4) performing lamination, to be specific, laminating the unsintered tape by a pressing machine according to thickness requirements of the film; 5) performing isostatic pressing, to be specific, performing isostatic pressing on the laminated tape; 6) cutting the tape, to be specific, cutting the tape into desired sizes; 7) performing latex discharging, to be specific, performing latex discharging at 0 to 450 DEG C at a temperature increasing speed of 0.5 DEG C / minute; 8) performing sintering, to be specific, performing sintering at 980 DEG C for 2 hours at a temperature increasing speed of 2 DEG C / minute; 9) performing laminating, to be specific, laminating the PET single-sided and double-sided adhesive films on the ferrite films by the aid of a laminating machine; and 10) performing squashing, to be specific, squashing the ferrite films.

Description

technical field [0001] The invention discloses a preparation method of a flexible sintered ferrite diaphragm, in particular a magnetic material applied to a radio frequency identification system (RFID). Background technique [0002] In recent years, radio frequency identification technology (RFID) and near field communication technology (NFC) have been more and more widely used. More and more companies are joining the ranks of R&D and production of NFC smartphones, NFC wearable devices, etc. [0003] In 13.56MHz RFID electronic tags or NFC applications, due to the low frequency band, the size of the NFC antenna is relatively large, and the internal space of the mobile phone or wearable device is limited. The general solution is to attach the antenna to metal such as the motherboard or battery. The location of the device is adjacent to each other, and what is more, it is directly attached to the metal surface. This brings a corresponding problem: when the antenna transm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/26C04B35/622
Inventor 徐佩韦赖定权黄树峰梁启新朱圆圆陈玲琳付迎华齐治张美蓉魏晓惠
Owner SHENZHEN MICROGATE TECH
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