A high magnetic flux ferrite powder that can reduce cracking

Abstract

The invention discloses high flux ferrite powder capable of reducing cracking. The raw materials of the high flux ferrite powder capable of reducing the cracking comprise the following components in parts by mole: 51.0 to 55.0 parts of iron sesquioxide, 21.0 to 25.0 parts of zinc oxide, and 20.0 to 28.0 parts of manganese oxide; glue with 0.7 to 1.5 weight parts of solid is added and a certain weight of an inert nano-composite material. Polyvinyl acetate with the glass transition temperature of less than 40 DEG C is added so that the one-dimensional compressibility of the powder is greatly improved; the inert nano-composite particles which are prepared by the main components of nano-amorphous iron oxide (or hydroxyl ferric oxide) and manganous-manganic oxide are adopted, so that the a gluedischarging channel can be provided in an early stage, and the inert nano-composite particles can be molten in original crystal particles without affecting the main component of the ferrite in a lateperiod; and the wear of slurry and a spraying piece of a spraying gun of a spraying tower can be reduced by performing spray-granulating by adopting the ferrite slurry which is coated by the inert nano-material which is coated by adopting a resistance reducing agent, namely a hydroxyethyl cellulose solution, so that the cost is reduced, and meanwhile, the size consistency of the particles is improved.

Description

technical field [0001] The invention relates to the technical field of ferrite powder, in particular to a high magnetic flux ferrite powder capable of reducing cracking. Background technique [0002] As an essential part of electronic devices, ferrite materials have been widely used in communication, electronics, aerospace and other fields. At present, ferrite materials are widely produced mainly as a kind of ceramic device, but since device manufacturers mostly use dry pressing, a part of air will be retained inside the blank during the pressing process, and the air, glue in the powder, and Concentrated volatilization of moisture, etc. can easily cause the blank to crack, and this quality problem generally results in a 2-10% defect rate or even higher in batch production. In the process of producing high magnetic flux ferrite, due to the higher sintering temperature and longer sintering time required, it is more likely to cause cracking of the blank. The existence of this...

AI Technical Summary

Problems solved by technology

At present, ferrite materials are widely produced mainly as a kind of ceramic device, but since device manufacturers mostly use dry pressing, a part of air will be retained inside the blank during the pressing process, and the air, glue in the powder, and Concentrated volatilization of moisture, etc. can easily cause the blank to crack, and this quality problem will generally cause a defective rate of 2-10% or even higher in batch production

In the process of producing high magnetic flux ferrite, due to the higher sintering temperature and longer sintering time required, it is more likely to cause cracking of the blank

The existence of this kind of defect greatly increases the quality cost of ferrite materials, and the main method to prevent cracking at present is to reduce the heating rate of the blank during the sintering process, but this method increases the production cost and causes other quality problems at the same time