Preparation method of flexible sintered ferrite films

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...

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

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